WO2016029771A1

WO2016029771A1 - Method and system for ipad to control courseware synchronization

Info

Publication number: WO2016029771A1
Application number: PCT/CN2015/085387
Authority: WO
Inventors: 唐军; 吴小建
Original assignee: 焦点科技股份有限公司
Priority date: 2014-08-25
Filing date: 2015-07-29
Publication date: 2016-03-03
Also published as: TW201608539A; BR112017003685A2; CN104158900B; CN104158900A; TWI547915B

Abstract

Disclosed are a method and system for an iPad to control courseware synchronization, which consists of a PC client, an iPad tablet computer, a projector, and an AP, wherein the PC client is a centre, the iPad tablet computer is connected to the PC client via the AP, the projector is directly connected to the PC client, and the specific steps comprise: a synchronization method for opening a courseware by means of an iPad; a synchronization method for operating a courseware by means of an iPad; and a synchronization method for annotating a courseware by means of an iPad. In the present invention, an operation on the iPad is transmitted to the PC client in the form of a packet, the PC client parses and executes same, so that remotely operating the courseware content display of the PC client by means of the iPad is achieved, and the aim of synchronizing the display of the courseware content thereof is realized. The method of converting the courseware content into a screenshot form to transmit same is widely applied and has a strong generality.

Description

Method and system for controlling courseware synchronization by iPad

Technical field

The invention relates to a method and a system for controlling courseware synchronization of an iPad.

Background technique

After years of construction, education informatization has been greatly developed. In particular, primary and secondary school teachers are now proficient in using Microsoft Office and other editing tools to produce various image and intuitive courseware, enriching the teaching content and improving the quality of teaching. positive effect.

However, how to deeply apply information technology to promote the development of education, organically combine information technology with education and teaching, and further improve the quality and efficiency of teaching will be the entry point and source of power for deepening education, which will further improve the learning style of students and the teaching of teachers. the way.

At present, in some qualified primary and secondary schools, most of the classrooms are equipped with computers and projectors. The teachers put their own various coursewares in the classroom computer, and the students learn through the projection screen, so that the courseware is rich. The content not only can visualize the visual content of the teaching content, but also attracts the attention of the students through various rich contents, which is conducive to the improvement of the teaching effect.

However, there is also a limitation that teachers can't leave the computer to interact with students when they are teaching in class. Otherwise, they will frequently return to the computer from the middle of the students to continuously display the courseware content, which leads to interruption. The coherence of teaching affects the teaching effect.

With the increasing popularity of tablet PCs, the use of tablets to assist teachers in lectures, for teachers, because of the portable features of the tablet, so that teachers can hold the tablet in the entire classroom during the lecture, which is more conducive to Classroom exchanges between teachers and students.

Due to the quality and popularity of tablets, Apple's iPad is among the best, so iPad is often the first choice for tablets. But the iPad uses Apple's dedicated mobile operating system iOS. This mobile operating system is self-contained and has a relatively large limitation on compatibility.

In the case of the extreme popularity of Microsoft Office, teachers often use the editing tools made by Microsoft Office and other editing tools, using the iPad to play PPT and WORD files, the effect of the display and the MICROSOFT OFFICE display on the PC is very different, this It is determined by the compatibility of the software and it is difficult to solve it in a short time.

For Microsoft Office, a complex format file, different versions may have differences in file parsing and rendering, which may cause the display content on the iPad to be different from the client display, or may differ from the assumptions made by the teacher when editing the Microsoft Office document. This will affect the teaching effect.

Moreover, the teacher can carry out the courseware operation on the iPad at any time during the teaching process, and if this operation cannot be synchronized to the computer in time, the student will not be able to view the contents of the teacher operation on the projection screen, and cannot keep up with the teacher's teaching in time. step.

Although the iPad can be directly connected to the projector, because the teacher operates the iPad courseware, there is a special teacher private area, including content and answers that only the teacher can see, and the information is not suitable for the students, so this There are also deficiencies in the direct connection method.

Therefore, how to make the teacher move freely during the student's free movement, and at the same time can synchronously teach the projected courseware content, which is very helpful for the improvement of teaching quality.

Summary of the invention

In view of the problems existing in the prior art, the present invention designs a method and system for controlling the synchronization of courseware by the iPad, and the technical solution adopted by the present invention is:

A method for controlling the synchronization of courseware by the iPad, comprising the method of synchronizing the courseware through the iPad; the method of synchronizing the courseware through the iPad; and the method of synchronizing the courseware by the iPad; the specific steps are:

The method for synchronizing the courseware through the iPad, the specific steps are:

Step 1: Establish a connection between the iPad and the PC client;

Step 2: The iPad issues an instruction to "open the courseware" to the PC client;

Step 3: The PC client processes the packet according to the iPad.

Step 4: The iPad processes the received screenshot information;

Step 1: The iPad sends an instruction to operate the courseware to the PC client; when the iPad operates on the opened courseware, the iPad side packages the corresponding operation instruction into a corresponding message and sends it to the PC client;

Step 2: The PC client processes the packet according to the iPad.

Step 3: The iPad processes the received screenshot information;

Step 1: In the initialization phase, in the courseware content area displayed on the PC client, a transparent layer is set on the top layer of the area, and the courseware display content is placed on the bottom layer; respectively, the length and width of the screen display area of the PC client and the iPad are respectively obtained. Calculate the length ratio and width ratio of the two; establish the coordinates of the screen display area of the PC client and the iPad, and use the vertex at the upper left as the coordinate origin;

Step 2: Courseware annotation on the iPad;

Step 3: The PC client converts coordinate values;

Step 4: According to the data sequence relationship, these points are sequentially connected on the transparent layer of the PC client to form an annotation track, thereby synchronizing the courseware annotation.

The invention also discloses a system for controlling the synchronization of courseware by the iPad, comprising: a PC client, an iPad tablet, a projector, an AP, wherein the PC client is centered, and the iPad tablet is connected to the PC client through the AP. The projector is directly connected to the PC client, and the PC client is installed with a PC client synchronization processing subsystem, and the iPad tablet computer is equipped with an iPad synchronization processing subsystem;

PC client, used to manage various courseware, and transform the courseware content into a picture format and transmit it to the iPad via wireless network;

An iPad tablet for receiving a picture transmitted by a PC client and simultaneously transmitting an operation instruction to the PC client through the same;

a projector for displaying courseware content on a PC client;

AP for information transfer between a PC client and an iPad tablet.

The PC client synchronization processing subsystem comprises a courseware display unit, a courseware processing unit, a screenshot processing unit, a comparator, a screenshot information generating unit, a screenshot storage unit, a screenshot download service unit, and a PC client communication service unit group. to make;

a courseware display unit for displaying the content of the courseware;

a courseware processing unit, configured to receive an operation instruction of the PC client communication service unit, and perform an operation;

a screenshot processing unit for periodically intercepting the content displayed by the courseware and saving it in the memory;

a comparator for comparing the screenshot information in the memory with the screenshot information in the screenshot storage unit;

A screenshot storage unit for saving screenshots downloaded by the iPad;

The screenshot information generating unit generates a screenshot information according to the comparison result of the comparator, if the comparison result is different, the screenshot information includes: identification information of the courseware, screenshot identification information, and a relative path saved by the screenshot;

Screenshot download service unit, download download for iPad download screenshots;

a PC client communication service unit, configured to communicate with an iPad communication service unit, receive an instruction message sent by the iPad, and send screenshot information to the iPad;

The iPad synchronization processing subsystem is composed of an input receiving unit, a screenshot display unit, a screenshot download storage unit, an information verification unit, and an iPad communication service unit;

An input receiving unit, configured to receive a teacher's operation information number on the iPad;

A screenshot display unit for displaying screenshots of courseware downloaded from a PC client;

Screenshot download storage unit, screenshot of courseware for downloading;

The information verification unit is configured to read the screenshot identification information in the screenshot information and compare it with the screenshot saved in the iPad;

The iPad communication service unit is configured to communicate with the PC client communication service unit, send the command message sent by the iPad, and receive the screenshot information to the iPad.

The beneficial effects of the method of the invention:

1. Convert the courseware content into a screenshot format. This method can support the courseware produced by various courseware tools, with wide application range and strong versatility.

2. The operation on the iPad is transmitted to the PC client in the form of a message, and the PC client performs parsing and execution, and realizes the courseware content display of the PC client remotely operated by the iPad, thereby achieving the goal of synchronizing the content display of the two coursewares.

3. Through the method of the invention, not only can the effect of the static courseware be well displayed, but also the dynamic effect in the PPT production courseware is satisfactorily displayed.

3. The joint use of UDP and TCP ensures a fast, dynamic and stable connection between the iPad and the PC client.

4. The iPad establishes a pairing relationship with the PC client to avoid interference from other devices.

5, in the process of screenshot transmission, through the comparison of screenshot content, and the priority use of iPad local screenshots, eliminating the transmission of duplicate content screenshots, saving network resources.

DRAWINGS

Figure 1 is a schematic illustration of the system of the present invention.

FIG. 2 is a schematic diagram of the iPad control courseware synchronization processing system of the present invention.

3 is a flow chart of a method for controlling the synchronization of the courseware of the iPad according to the present invention.

4 is a flow chart of a synchronization method for operating a courseware through an iPad according to the present invention.

FIG. 5 is a flowchart of a courseware synchronization process composed of multiple pictures according to the present invention.

detailed description

The invention will be further described in detail below with reference to the drawings and specific embodiments.

The iPad controls the courseware synchronization system of the embodiment, including:

A device for synchronizing courseware, which is composed of a PC client, an iPad tablet, a projector, and an AP (Wireless Access Point). The PC client is centered on the PC, and the iPad tablet is connected to the PC client through the AP. The projector is directly connected to the PC client.

The PC client is used to manage various courseware and convert the courseware content into a picture format for transmission to the iPad over a wireless network.

The IPad tablet is used to receive pictures transmitted by the PC client, and at the same time the teacher can send operation instructions to the PC client.

The projector is used to display the courseware content on the PC client.

The AP is used for information transfer between the PC client and the iPad tablet.

As shown in Figure 1, a schematic representation of the system of the present invention.

An iPad controlled courseware synchronization processing system, comprising:

PC client synchronization processing subsystem and iPad synchronization processing subsystem.

The PC client synchronization processing subsystem is composed of a courseware display unit, a courseware processing unit, a screenshot processing unit, a comparator, a screenshot information generating unit, a screenshot storage unit, a screenshot download service unit, and a PC client communication service unit.

A courseware display unit that displays the content of the courseware.

The courseware processing unit is configured to receive an operation instruction of the PC client communication service unit and perform an operation.

The screenshot processing unit is configured to periodically intercept the content displayed by the courseware and save it in the memory.

A comparator for comparing the screenshot information in the memory with the screenshot information in the screenshot storage unit.

A screenshot storage unit for saving screenshots downloaded by the iPad.

The screenshot information generating unit generates the screenshot information according to the comparison result of the comparator, if the comparison result is different, the screenshot information includes: the identification information of the courseware, the screenshot identification information, and the relative path of the screenshot saving.

Screenshot download service unit, download download for iPad download screenshots.

The PC client communication service unit is configured to communicate with the iPad communication service unit, and the main function is to receive the instruction message sent by the iPad and send the screenshot information to the iPad.

The iPad synchronization processing subsystem is composed of an input receiving unit, a screenshot display unit, a screenshot download storage unit, an information verification unit, and an iPad communication service unit.

The input receiving unit is configured to receive the teacher's operation information number on the iPad.

Screenshot display unit for showing screenshots of courseware downloaded from the PC client.

Screenshot download storage unit for downloading courseware screenshots.

The information verification unit is configured to read the screenshot identification information in the screenshot information and compare it with the screenshot saved in the iPad.

The iPad communication service unit is used for communication with the PC client communication service unit, and the main function is to send an instruction message sent by the iPad and receive the screenshot information to the iPad.

As shown in FIG. 2, the iPad controls the courseware synchronization processing system of the present invention.

A method for controlling the synchronization of courseware by the iPad, comprising:

To open the courseware synchronization method via iPad, the steps are as follows:

Step 1: Establish a connection between the iPad and the PC client.

(1) Before the iPad starts the courseware, first establish a UDP connection with the PC client.

After the UDP connection is successfully established, the PC client sends the IP address and port of the network where the PC client is located to the iPad through the UDP connection, so that the iPad can quickly and dynamically establish a TCP connection with the PC client.

When the network signal is unstable, there will be a situation where the iPad does not receive UDP. At this time, the iPad automatically uses a fixed IP address to establish a connection with the PC client through this IP. As long as the client changes the IP to this fixed IP address, it will ensure that the TCP connection is established without receiving UDP.

(2) The corresponding TCP connection is established between the iPad and the PC client. After the TCP connection is established, the iPad and the PC client can communicate with each other, and prepare for the transmission of related instructions and picture resources.

(3) The iPad sends a verification code to the PC client, and after the PC client verifies the verification, a one-to-one correspondence relationship is established.

Step 2: The iPad issues an instruction to “open the courseware” to the PC client.

Select the corresponding courseware on the iPad, click and execute the “Open Courseware” operation. For the iPad side, the corresponding instruction "open courseware" is packaged into corresponding messages and sent to the PC client. The basic structure of the message is:

字段名Field name	报文长度Message length	协议命令Protocol order	消息IDMessage ID	报文体Message body
字段名Field name	报文长度Message length	协议命令Protocol order	消息IDMessage ID	报文体Message body	字段类型Field Type	Int(4byte)Int (4byte)	int(4byte)Int(4byte)	Int(4byte)Int (4byte)	Value(Protocolbuf、JSON)Value (Protocolbuf, JSON)

among them:

Packet length: length of the protocol command + length of the message ID + length of the message body.

Protocol command: The protocol command includes the command sent by the PC to the iPad, and the command sent by the iPad to the PC to tell the other party what operation itself is initiating. When the other party receives the message and parses it, it will process different business logic according to the protocol command. For example, when a user logs in using the iPad, the iPad first sends a login verification command to the PC. After receiving the PC client, the PC client will send the login verification result to the iPad.

Message ID: Although the protocol command records different operations, it does not distinguish between protocol commands for repeated operations. For example, the user does three slides to the left, the protocol command is the same, but the message ID is incremented to distinguish the commands that are repeated.

Message body: The message body is the content of the message. For example: When a user logs in using the iPad, the iPad first sends a message length, a login verification command, a message ID, and a message body to the PC. The message body here is the pairing code input by the user. After receiving the PC client, the PC client will send the login verification result to the iPad and report the report style. The message body here is the login result, login success, login failure and the reason for the failure.

Step 3: The PC client processes the packets according to the iPad.

(1) After receiving the "open courseware" message, the PC client parses the corresponding message.

(2) Open the corresponding courseware on the PC client.

(3) Start the timer and periodically take a screenshot of the courseware content displayed on the PC client.

If the first screenshot after opening the courseware, save it in memory and make sure it is the image to be sent, directly execute (4).

Then each time the screenshot is compared with the content to be sent saved in the memory, if the same, then do not send Send processing, if not the same, save the new screenshot in memory, and determine that it is the screenshot to be sent, directly execute (4).

(4) After confirming the screenshot to be sent, save this screenshot in a dedicated space.

(5) Forming screenshot information, the screenshot information includes: identification information of the courseware, screenshot identification information, and a relative path for saving the screenshot.

(6) The PC client packages the screenshot information into a message and sends it to the iPad.

Step 4: The iPad processes the received screenshot information.

(1) After receiving the message, the iPad parses the corresponding message to form a screenshot information.

(2) Read the "relative path saved by the screenshot" in the screenshot information.

(3) Assemble the http URL address and download the screenshot from the PC client.

(4) The download is completed and saved in the screenshot download storage unit.

(5) Screenshots are shown on the iPad.

As shown in FIG. 3, the iPad of the present invention controls a flow chart of a method for synchronizing courseware.

The method of synchronizing the courseware through the iPad, the specific steps are as follows:

Step 1: The iPad sends an instruction to the PC client to operate the courseware.

In the iPad, the courseware that has been opened is operated, and the iPad side packages the corresponding operation instructions into corresponding messages and sends them to the PC client.

Step 2: The PC client processes the packets according to the iPad.

(1) After receiving the packet, the PC client parses the packet.

(2) According to the instructions of the message, the corresponding operation of the courseware.

(3) After each screenshot, compare the content with the image to be sent saved in the memory. If they are the same, do not send the processing. If they are not the same, save the new screenshot in the memory and determine that it is to be sent. Screenshot.

Step 3: The iPad processes the received screenshot information.

(1) After receiving the message, the iPad parses the corresponding message to form a complete screenshot information.

(2) Verify the screenshot of the information. Filter unrelated screenshot information, filter conditions: type of screenshot information (for example, whether the map belongs to teaching activities or classroom exercises), identification of screenshot information (for example, test paper ID), index of screenshot information (such as images in the test paper) Index, the index of the first picture is 1).

(3) Assemble the http URL address and perform the download operation.

(5) Screenshots are shown on the iPad.

As shown in FIG. 4, a flow chart of a synchronization method for operating a courseware by an iPad according to the present invention.

Synchronization methods for annotating courseware via iPad, including:

Step 1: Initialization phase:

In the courseware content area displayed on the PC client, a transparent layer is set on the top layer of the area, and the courseware display content is placed on the bottom layer.

Obtain the length and width of the screen display area of the PC client and iPad respectively, and calculate the length ratio of the two. Width ratio.

Establish the coordinates of the screen display area of the PC client and iPad, with the vertices on the upper left as the coordinate origin.

Step 2: Courseware annotations on the iPad.

(1) The iPad touch screen acquires the movement track of the teacher's finger on the screen.

(2) Convert the motion trajectory into a series of points and obtain the coordinate values of a series of sampling points on the iPad screen.

(3) Forming a data sequence relationship according to the order of the sampling points.

Step 3: PC client converts coordinate values

(1) Through the message form, the iPad sends the operation command, the sampling point coordinate value and the data sequence relationship to the PC client.

(2) The PC client parses the message.

(3) Read the coordinate values of this series of sampling points.

(4) Calculate the coordinate value of each point on the screen display area of the PC client according to the length ratio and width ratio of the screen display area of the PC client and the iPad.

For the courseware synchronization process composed of multiple images, including:

Step 1: The iPad sends an instruction to open the courseware to the PC client.

Select the corresponding multi-picture courseware on the iPad, click and execute the “Open Courseware” operation. For the iPad side, the corresponding instruction "open courseware" is packaged into corresponding messages and sent to the PC client.

Step 2: The PC client processes the packets according to the iPad.

(1) After receiving the packet, the PC client parses the packet.

(2) Open the courseware composed of multiple pictures according to the instructions of the message.

(3) Save these pictures in a special space and send them all to the iPad.

(4) According to the picture displayed by the PC client, the picture information is packaged into a message and sent to the iPad. The picture information includes: picture identification information.

Step 3: The iPad processes the received picture information.

(1) After receiving the message, the iPad parses the corresponding message to form a complete picture information.

(2) Verify the picture information. Compare with the pictures in the download save unit in the iPad. If they are not the same, execute the subsequent download operation and execute (3); if they are the same, directly select the same picture in the screenshot download and save unit, and execute (5) .

(3) Assemble the http URL address and perform the download operation.

(4) The download is completed and saved in the map download storage unit.

(5) Screenshots are shown on the iPad.

As shown in FIG. 5, a flow chart of a courseware synchronization process composed of multiple pictures of the present invention.

The process of receiving screenshot information from iPad, including:

Step 1: The PC client pushes the message to the iPad in batches.

Step 2: After receiving the messages, the iPad puts them into the buffer.

Step 3: Perform segmentation interception analysis on the packet by the length of the interception unit. When a batch of messages is intercepted, some messages will remain, and their length does not satisfy the length of the interception unit.

Where the length of the intercept unit = message length + 4 bytes

Step 4: Determine whether the packet parsing condition is met according to the intercepted result. If yes, go to step 5. If not, the iPad waits to accept the next batch of packets pushed by the PC client, and performs step two.

Step 5: Parsing into a PushImage object, successfully obtaining the screenshot information contained therein, and sending the parsed successful message receipt to the PC client.

Step 6: Update the buffer. The main reason is to move the parsed message out of the buffer.

Step 7: Read the courseware identifier in the screenshot information, assemble the Http URL address, and prepare to download.

The above disclosure is only a specific embodiment of the present invention, and of course, the scope of the present invention is not limited thereto, and the changes or equivalent changes according to the technical spirit of the claims of the present invention still fall within the scope of the present invention. The scope covered by the request.

Claims

A method for controlling courseware synchronization of an iPad, comprising: a synchronization method for opening a courseware through an iPad; a synchronization method for operating a courseware through an iPad; and a synchronization method for annotating courseware through an iPad;

The method for synchronizing the courseware through the iPad, the specific steps are:

Step 1: Establish a connection between the iPad and the PC client;

Step 2: The iPad issues an instruction to "open the courseware" to the PC client;

Step 3: The PC client processes the packet according to the iPad.

Step 4: The iPad processes the received screenshot information;

The method for synchronizing the courseware through the iPad, the specific steps are:

Step 1: The iPad sends an instruction to operate the courseware to the PC client; when the iPad operates on the opened courseware, the iPad side packages the corresponding operation instruction into a corresponding message and sends it to the PC client;

Step 2: The PC client processes the packet according to the iPad.

Step 3: The iPad processes the received screenshot information;

The method for synchronizing the courseware through the iPad, the specific steps are:

Step 1: In the initialization phase, in the courseware content area displayed on the PC client, a transparent layer is set on the top layer of the area, and the courseware display content is placed on the bottom layer; respectively, the length and width of the screen display area of the PC client and the iPad are respectively obtained. Calculate the length ratio and width ratio of the two; establish the coordinates of the screen display area of the PC client and the iPad, and use the vertex at the upper left as the coordinate origin;

Step 2: Courseware annotation on the iPad;

Step 3: The PC client converts coordinate values;

Step 4: According to the data sequence relationship, these points are sequentially connected on the transparent layer of the PC client to form an annotation track, thereby synchronizing the courseware annotation.
The method for synchronizing the courseware of the iPad according to claim 1, wherein the method for synchronizing the opening of the courseware through the iPad, the specific implementation method of the step 1:

Step 1-1: Before the iPad starts the courseware, first establish a UDP connection with the PC client;

After the UDP connection is successfully established, the PC client sends the IP address and port of the network where the PC client is located to the iPad through the UDP connection, so that the iPad can quickly and dynamically establish a TCP connection with the PC client.

When the network signal is unstable, there will be no UDP on the iPad. At this time, the iPad automatically uses a fixed IP address to establish a connection with the PC client through this IP; as long as the client changes the IP to this fixed IP address. , can guarantee to establish a TCP connection without receiving UDP;

Step 1-2: A corresponding TCP connection is established between the iPad and the PC client. After the TCP connection is established, the iPad and the PC client communicate with each other to prepare for the transmission of related instructions and picture resources.

Step 1-3: The iPad sends a verification code to the PC client, and after the PC client passes the verification, a one-to-one correspondence relationship is established;

Step 2: The corresponding implementation method is as follows: select the corresponding courseware on the iPad, click to execute the “open courseware” operation; for the iPad, the corresponding instruction “open courseware” is packaged into corresponding messages and sent to the PC client;

Step 3 specific implementation method:

Step 3-1: After receiving the “open courseware” message, the PC client parses the corresponding message;

Step 3-2: Open the corresponding courseware in the PC client;

Step 3-3: Start a timer, and periodically take a screenshot of the courseware content displayed on the PC client;

If the first screenshot after opening the courseware, save it in memory, and determine it is the image to be sent, directly perform steps 3-4;

Then each time the screenshot is compared with the image to be sent stored in the memory, if it is the same, then the sending process is not performed. If it is not the same, the new screenshot is saved in the memory, and it is determined to be the screenshot to be sent, directly Perform steps 3-4.

Step 3-4: After determining the screenshot to be sent, save the screenshot in a special space;

Step 3-5, forming screenshot information, the screenshot information includes: identification information of the courseware, screenshot identification information, and a relative path saved by the screenshot;

Step 3-6, the PC client packages the screenshot information into a message and sends it to the iPad.

Step 4 specific implementation method:

Step 4-1: After receiving the packet, the iPad parses the corresponding packet to form a screenshot information.

Step 4-2: Read the "relative path saved by the screenshot" in the screenshot information;

Step 4-3, assemble the http URL address, and download the screenshot from the PC client.

Step 4-4, the download is completed, and is saved in the screenshot download storage unit;

Steps 4-5, the screenshots are displayed on the iPad.
The method for synchronizing the courseware of the iPad according to claim 1, wherein the method for synchronizing the courseware through the iPad, the second step is a specific implementation method:

Step 2-1: After receiving the packet, the PC client parses the packet.

Step 2-2: Perform corresponding operations on the courseware according to the instructions of the message;

Step 2-3: After each screenshot, the content is compared with the image to be sent stored in the memory. If they are the same, the sending process is not performed. If not, the new screenshot is saved in the memory, and it is determined to be Pending screenshots;

Step 2-4: After determining the screenshot to be sent, save the screenshot in a special space;

Step 2-5, forming screenshot information, the screenshot information includes: identification information of the courseware, screenshot identification information, and a relative path for saving the screenshot;

Step 2-6, the PC client packages the screenshot information into a message and sends it to the iPa;

Step 3 specific implementation method:

Step 3-1: After receiving the packet, the iPad parses the corresponding packet to form a complete screenshot information.

Step 3-2: verifying the screenshot of the information; filtering the unrelated screenshot information, filtering conditions: the type of the screenshot information, the identifier of the screenshot information, and the index of the screenshot information;

Step 3-3, assembling into an http URL address, and performing a download operation;

Step 3-4, the download is completed, and is saved in the screenshot download storage unit;

Steps 3-5, the screenshots are displayed on the iPad.
The method for synchronizing the courseware of the iPad according to claim 1, wherein the method for synchronizing the courseware by the iPad, the second step is a specific implementation method:

Step 2-1: The iPad touch screen acquires a motion track of the teacher's finger on the screen;

Step 2-2: Convert the motion trajectory into a series of points, and obtain coordinate values of a series of sampling points on the iPad screen;

Step 2-3: forming a data sequence relationship according to the sequence of the sampling points;

Step 3 specific implementation method:

Step 3-1: Through the message form, the iPad sends the operation instruction, the sampling point coordinate value, and the data sequence relationship to the PC client;

Step 3-2: The PC client parses the packet.

Step 3-3: reading coordinate values of the series of sampling points;

Step 3-4: Calculate the coordinate value of each point in the display area of the PC client screen according to the length ratio and the width ratio of the screen display area of the PC client and the iPad.
The iPad control courseware synchronization method according to claim 1, wherein the basic structure of the message is: message length + protocol command + message ID, message body; wherein:

Packet length: length of the protocol command + length of the message ID + length of the message body;

Protocol command: The protocol command includes the command sent by the PC to the iPad, and the command sent by the iPad to the PC to tell the other party what operation it is in itself; when the other party receives the message and parses it, it will handle different services according to the protocol command. logic;

Message ID: Although the protocol command records different operations, it cannot distinguish the protocol commands of repeated operations, and the message ID is always incremented to distinguish the commands of repeated operations;

Message body: The message body is the content transmitted.
The iPad control courseware synchronization method according to any one of claims 1 to 5, characterized in that it further comprises a courseware synchronization processing step for multi-picture composition, and the specific implementation method is as follows:

Step 1: The iPad sends an instruction to open the courseware to the PC client; select the corresponding multi-picture courseware on the iPad, click to execute the “open courseware” operation; for the iPad, the corresponding instruction “open courseware” is packaged into corresponding The message is sent to the PC client;

Step 2: The PC client processes the packet according to the iPad.

(1) After receiving the packet, the PC client parses the packet;

(2) Open the courseware composed of multiple pictures according to the instructions of the message;

(3) Save these pictures in a special space, all sent to the iPad;

(4) According to the picture displayed by the PC client, the picture information is packaged into a message and sent to the iPad; wherein the picture information includes: picture identification information;

Step 3: The iPad processes the received picture information;

(1) After receiving the message, the iPad parses the corresponding message to form a complete picture information;

(2) verifying the picture information; comparing with the pictures in the screenshot download storage unit in the iPad, if not the same, performing subsequent download operations, executing (3); if the same, directly selecting in the screenshot download storage unit The same picture, executed (5);

(3) Assembled into an http URL address to perform a download operation;

(4) The download is completed and saved in the screenshot download storage unit;

(5) Screenshots are shown on the iPad.
The iPad control courseware synchronization method according to any one of claims 1 to 5, characterized in that it further comprises the step of receiving the screenshot information by the iPad, and the specific implementation method is as follows:

Step 1: The PC client pushes the message to the iPad in batches;

Step 2: After receiving these messages, the iPad puts it into the buffer;

Step 3: Perform segmentation interception analysis on the length of the interception unit; when a batch of packets is intercepted, some messages will remain, and their length does not meet the length of the interception unit; Length = message length + 4 bytes;

Step 4: judging whether the message parsing condition is satisfied according to the intercepted result; if yes, proceeding to step 5, if not satisfied, the iPad waits to accept the next batch of packets pushed by the PC client, and performs step 2;

Step 5: Parsing into a PushImage object, successfully obtaining the screenshot information contained therein, and sending the parsed successful message receipt to the PC client;

Step 6: Update the buffer; move the successfully parsed message out of the buffer;

Step 7: Read the courseware identifier in the screenshot information, assemble the Http URL address, and prepare for download.
A system for controlling courseware synchronization of an iPad, comprising: a PC client, an iPad tablet, a projector, and an AP, wherein the PC client is centered, and the iPad tablet is connected to the PC client through the AP, and the projector directly communicates with the PC. The client is connected, and the PC client is installed with a PC client synchronization processing subsystem, and the iPad tablet computer is equipped with an iPad synchronization processing subsystem;

PC client, used to manage various courseware, and transform the courseware content into a picture format and transmit it to the iPad via wireless network;

An iPad tablet for receiving a picture transmitted by a PC client and simultaneously transmitting an operation instruction to the PC client through the same;

a projector for displaying courseware content on a PC client;

AP for information transfer between a PC client and an iPad tablet.
The iPad controlled courseware synchronization system according to claim 8, wherein:

The PC client synchronization processing subsystem is composed of a courseware display unit, a courseware processing unit, a screenshot processing unit, a comparator, a screenshot information generating unit, a screenshot download storage unit, a screenshot download service unit, and a PC client communication service unit;

a courseware display unit for displaying the content of the courseware;

a courseware processing unit, configured to receive an operation instruction of the PC client communication service unit, and perform an operation;

a screenshot processing unit for periodically intercepting the content displayed by the courseware and saving it in the memory;

a comparator for comparing the screenshot information in the memory with the screenshot information in the screenshot storage unit;

Screenshot download storage unit for saving screenshots downloaded by iPad;

The screenshot information generating unit generates a screenshot information according to the comparison result of the comparator, if the comparison result is different, the screenshot information includes: identification information of the courseware, screenshot identification information, and a relative path saved by the screenshot;

Screenshot download service unit, download download for iPad download screenshots;

a PC client communication service unit, configured to communicate with an iPad communication service unit, receive an instruction message sent by the iPad, and send screenshot information to the iPad;

The iPad synchronization processing subsystem is composed of an input receiving unit, a screenshot display unit, a screenshot download storage unit, an information verification unit, and an iPad communication service unit;

An input receiving unit, configured to receive a teacher's operation information number on the iPad;

A screenshot display unit for displaying screenshots of courseware downloaded from a PC client;

Screenshot download storage unit for storing downloaded courseware screenshots;

The information verification unit is configured to read the screenshot identification information in the screenshot information and compare it with the screenshot saved in the iPad;

The iPad communication service unit is configured to communicate with the PC client communication service unit, send an instruction message sent by the iPad, and receive screenshot information to the iPad.