KR20000030159A - Display method of split screen - Google Patents

Abstract

PURPOSE: A method for displaying multiple screens is provided to check the progress of learning via a communication network by monitoring the screen of a learner's device at a teacher's device. CONSTITUTION: A method for displaying multiple screens comprises the steps of: (S100)dividing a screen of one of computers, corresponding to a master device, into several regions; (S102)preparing a list of IP addresses for the computers, IP address representing unique names of the computers on the communication network; and processing the lists of IP addresses so that the computers can communicate with each other; (S104)assigning the screen of a certain computer, a slave device, to a desired one of the divided regions; and (S110)outputting the screen information on the desired region thereof, the screen information being related to the assigned computer.

Description

Display method of split screen}

The present invention relates to a multi-screen display method, and more particularly, to a multi-screen display method for monitoring a screen of a learner device connected to a predetermined communication network.

In general, PC training labs connected to a local area network are operated to provide Internet education in schools, academies, and companies. In the PC training lab, the instructor needs to know the learners' training status, that is, the degree of learning. The lab status can be seen by looking at the learner's monitor what the learner's PC is doing.

1 is a view for explaining a computer training system according to the prior art.

In the prior art computer education system, as shown, a plurality of PCs 10 to 18 including a monitor and a keyboard are connected to each other by a predetermined network such as a local area network (LAN).

As described above, a predetermined protocol is set so that the plurality of PCs 10 to 18 connected to each other exchange information with each other. For example, the PCs may be short-range communicated by the TCP / IP protocol and the network adapter.

That is, the PC education system according to the related art is to check the contents of the monitor screen of the PC that the instructor is using while the instructor moves the space of the education center in order to grasp the use state of the learner PC.

However, in this method, as the number of learner PCs increases, in order to check the learner's screen contents, the learner's screen must be moved once and the education lab room where the PC is installed must be moved, and the screens of each educator's monitor must be checked one by one. The problem is that it takes a long time for education.

Accordingly, an object of the present invention for solving the above problems is to set the computer devices connected through a predetermined network as the instructor device and the learner device, thereby monitoring the learner's monitor by monitoring the screen of each learner device in the instructor device. It is to provide a multi-screen display method that does not need to go through and check the screen status.

1 is a view for explaining a computer training system according to the prior art.

2 is a flowchart illustrating a multi-screen display method according to the present invention.

3 is a diagram illustrating four child windows divided in one screen.

FIG. 4 is a diagram illustrating an embodiment of a learner address book according to the multi-screen display method of FIG. 2.

FIG. 5 is a flowchart illustrating a method of managing a learner address book of FIG. 4.

<Description of the symbols for the main parts of the drawings>

10, 12, 14, 18 .. Computer Devices

40. Index 42. Learner device name

44 .. IP address 46 .. Time stamp

48 .. Status

In order to achieve the above object, the multi-screen display method of the present invention comprises the steps of: connecting a plurality of computer devices used by different users through a predetermined communication network; Setting up at least one slave device having at least one master device of said plurality of computer devices and controlled by said master device; And controlling, by the master device, content to be output on a screen of at least one slave device of the slave device to be simultaneously output on a predetermined area of its own screen.

The master device outputs screen information of the slave device on its screen for a predetermined time, selects a screen of the slave device output from the own screen, and inputs predetermined information. The predetermined information may be generated in the same manner in the slave device by transmitting to the device.

According to another aspect of the present invention, there is provided a multi-screen display method of the present invention. Dividing into regions; Providing an address book of the plurality of computer devices, and processing the address book so that they can exchange information with each other; Designating a screen of at least one computer device among the plurality of computer devices in a predetermined area of the divided screen; And outputting screen information of the designated computer device on the divided screen.

The outputting may include: connecting a session of the computer device designated to the divided area with the arbitrary computer device; Transmitting the screen information to the any computer device in accordance with the connection of the session; Outputting the transmitted screen information in a divided area of the arbitrary computer device; When the screen information is output, determining whether a search period is performed, and if it is determined that the predetermined period has not been determined in the search period determination, repeating from the transmitting step; And if it is determined that the predetermined period has been reached, releasing a session between the computer device designated as the divided area and the arbitrary computer device.

The processing of the address book information may include: waiting for the master device to receive screen information from any slave device; Determining, by the master device, whether a packet indicating the presence of the slave device has been received; If it is determined that the packet has been received, searching for the existence of a corresponding item in the master device; Determining whether the corresponding item already exists in the master device; If it is determined that there is no corresponding item in the determining of the corresponding item, adding the new item; And if it is determined that the new item already exists in the corresponding item, updating the time information and the status information of the new item.

The master device has an address book for searching the corresponding item,

The address book may include: an index indicating a sequence number in the address book; The slave device name; An IP address representing a unique address on a network assigned to the slave device; A time stamp indicating a date and time that the existence of the slave device is recognized; And a state indicating a communication state between the master device and the slave device.

Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to the accompanying drawings.

2 is a flowchart illustrating a multi-screen display method according to the present invention.

In the multi-screen display method according to the present invention, the screen of the instructor device (hereinafter referred to as the instructor screen) is first divided into predetermined areas.

That is, any one of the plurality of PCs (hereinafter, referred to as computer devices) (10 to 18) shown in FIG. 1 is set as a teaching device that is a master device and a remaining device is a learner device that is a slave device. Since the person using the device can perform computer training on multiple learners using the learner's device, the instructor's screen can check the screen of the learner's device. can do.

For example, by dividing the width and height of an instructor's screen by n (n is an integer of 2 or more), a program can obtain n * n rectangular areas. This is the maximum number of learner device screens (hereafter termed learner screens) to search for screens simultaneously.

The horizontal length of the rectangular area may be set by dividing the width of the instructor screen by n, and the vertical height may be set by dividing the height of the instructor screen by n.

The point on the upper left of each rectangular area can be expressed using a coordinate system in which the x and y values increase toward the right and the bottom with the reference point of the upper left of the instructor screen as x = 0 and y = 0.

In this case, each of the n * n rectangular areas may be created as a window called a child window of the Windows operating system.

In addition, the child window may be generated by using the upper left point and the length and height of the area together with a window application programming interface function. In an embodiment according to the present invention, FIG. A diagram showing a child window divided into dogs.

Each of the four child windows divided into four display screen contents of each learner device connected by a predetermined communication network.

On the other hand, the instructor device has a learner address book to exchange information with the learner device through a communication network, and processes the address book so that they can exchange information with each other (s102).

That is, before establishing a multi-communication connection for transmitting / receiving screen data with the learner device, the instructor device must know through the address book the address of the network of all the learner devices connected to the local area network from the lab and whether the learner device can communicate with each other. do.

At this time, the address book is used as the learner address book in the embodiment. As shown in FIG. 4, the index 40 indicating the order number in the learner address book, the learner device name 42 called HOST NAME, and the learner device are assigned. An IP address 44 representing a unique address on the established network, a time stamp 46 indicating the date and time that the learner device was recognized, and a status indicating a communication connection status with the learner device at the instructor device side ( 48) and the like.

Then, a screen of a computer apparatus, for example, an arbitrary learner screen, is designated as each area of the instructor screen divided into a predetermined area in the dividing step (s100) using the learner address book information (s104).

That is, a unique port value of the learner screen is assigned to each screen split window in order to assign one learner screen to each of the divided windows on the instructor screen.

These port values are for the instructor device to receive data including the screen information currently displayed from the learner device, and based on this, the instructor device determines the division window in which the instructor device will process the data received from the learner devices. Becomes

Then, the instructor device sends a packet containing the port value of the screen to be used for transmission and reception of screen data later through the communication network to the corresponding learner device designated in the partition window. In order to correct an error of the screen information output from the learner's device, the instructor's screen inputs predetermined information related to the correction guidance command. Accordingly, the instructor device transmits the predetermined information to the slave device and generates the information on the slave screen. Learners using the device can be instructed to correct errors.

In addition, the learner device receiving the packet containing the port value recognizes that the split window of the instructor device has attempted to connect a screen transmission / reception session with itself, and as a response, the learner device sends a packet containing data on its screen resolution and color. Will be sent to the device.

When the learner device sends the packet to the instructor device as described above, the screen information of the computer device designated in the divided screen is output. (S106 to s114)

That is, the session for receiving and transmitting the data of the screen is connected (s106).

In more detail, when the instructor device receives the learner device's response packet for each split window displayed on the instructor screen, the instructor device opens a connection-oriented stream socket set to the specified unique port value and connects to the session. Will listen.

When the instructor device waits as described above, the learner device transmits a screen setting value packet, opens a connection-oriented stream socket, and thus attempts to connect to a unique port designated as a split window.

Then, the instructor device accepts the connection attempt of the learner device to establish a session connection for transmission and reception of screen data.

When the session is connected in this way, the learner device transmits information including its full screen data to the instructor device (S108).

The information circulated on a transmission / reception session connection of screen information uses a bitmap as an embodiment, where a full screen bitmap may be represented by a two-dimensional array of pixels, and pixels are used to represent a full screen. It is a small square of the smallest size that occurs when forming a plurality of horizontal and vertical lines with a certain interval, and can be represented by bits representing colors.

For example, when a session connection of screen information is established, the learner device first calls a Windows Graphic Device Interface (GDI) function such as CreateDC, CreateCompatibleDC, CreateCompatibleBitmap, BitBlt, GetDIBits, and the like and stores them in a buffer in memory. You will create a bitmap of the full screen image.

In this case, if the pixel value repeatedly appears in the image bitmap, the repeated length is stored and stored, the data is compressed by a Run Length Encoding method of recording the pixel value and the repeated number, and the screen bit You can reduce the data size of the map and remember the reduced size.

The reason for the compression is to obtain the effect of reducing the communication time by reducing the amount of data exchanged on the communication.

Then, all the data related to the screen resolution in the learner device, the compressed data size of the full screen bitmap, and the compressed screen bitmap data are transmitted to the instructor device.

The bitmap data transmitted as described above is received by the instructor device, and the learner screen information is output in the divided area selected by the address information among the divided areas of the instructor device screen (s110).

That is, the screen resolution and the size of the compressed screen bitmap are first received from the learner device, and the compressed screen bitmap data is received and stored in the memory buffer.

Then, the data stored in the memory buffer is read in order from the beginning to the end, and decompressed so that the reference pixel value and the number of repeated times can be decoded and restored to the screen bitmap of the original image.

When the decompression is completed as described above, a window application programming interface function such as InvalidateRect, UpdateWindow, etc. is called to generate a window message WM_PAINT for data processing, for example, drawing a bitmap in the screen split window.

In the WM_PAINT message processing of the split screen, the screen resolution received from the learner, that is, the size data of the full screen bitmap and the full screen bitmap data decompressed and decompressed, are created using the Windows Graphic Device Interface (GDI) function CreateCompatibleDC, Used with CreateDIBitmap and StretchBlt, the learner's device is reduced to the current full-screen area of the split pane.

As described above, when the learner screen information is output in a predetermined area of the split window, it is determined whether the search period is performed (s112).

That is, in the search period determination (s112), when the elapsed time reaches the screen search time period, the instructor device closes the socket for the connection of the screen data transmission / reception session between the n * n screen split windows and the learner device established up to that point in time. Close).

If it is determined that the search period has not reached, the process repeats the process of transmitting the full screen data of the learner device as a bitmap to the instructor device (S108).

In addition, the instructor's socket closure is immediately detected by the corresponding learner's device, and the detected learner's device stops generating, compressing, and sending the screen bitmap.

That is, the session established between the learner device and the instructor device is released according to the closing of the socket and the interruption of the bitmap generation, compression, and transmission operations (s114).

Accordingly, when all screen data send / receive session connections between the instructor device and the learner device are released, the instructor device designates the learner device to designate the next n * n learner entries in the learner's address book as the target of the new screen data send / receive session connection. The process returns to step S104 to prepare for a new designation.

5 is a flowchart illustrating a method of managing a learner address book.

That is, the specific method of processing the learner address book in the step of processing the learner address book (s102) is processed according to the flowchart showing the method of processing the learner address book of FIG.

First, the instructor device is waiting to receive screen information from any learner device (s200).

That is, the learner device sends a User Datagram Protocol (UDP) packet including the name of the learner device to the instructor device by using a timer interrupt service, and the instructor device waits to receive it.

At this time, the UDP packet is referred to the instructor device along the communication network by referring to the IP address of the instructor device and a port number for checking the learner device existence specified by the mutual appointment between the instructor device and the learner during a period of setting once per second. Will be sent to.

The instructor device then determines whether a packet indicating the presence of the learner device has been received (s202).

That is, it is determined whether the packet is received by the instructor device, and if it is not received, the process is repeated from the step of waiting (s200).

However, if the instructor device determines that a packet has been received, an asynchronous event occurs from the received packet to recognize the address of the source where the packet was sent, and obtain information including the address and the name of the learner device contained in the packet. In step S204, the user's address book is searched for whether the corresponding item exists.

In the search s204, it is determined whether the corresponding item already exists in the learner address book.

If it is determined in step S206 that there is no corresponding item, a new item is added to the learner address book.

At this time, the new item added as an embodiment records information related to the current date time in the time stamp column, and records "connected" in the status column.

However, if it is determined that the corresponding entry already exists in the learner's address book, the time stamp and the status column are recorded in the current date time information, and the information in the status column is updated from "disconnected" to "connected" (s210).

At this time, the instructor device compares the current time and the time of each item in the learner's address book at a specific time interval, and updates the status column from "connected" to "disconnected" if the difference is greater than a specific value (for example, 10 seconds). This may indicate that there is a communication error between learner devices.

The best embodiments have been disclosed in the drawings and the specification. Although specific terms have been used herein, they are used only for the purpose of describing the present invention and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

According to the present invention, a multi-screen data transmission / reception session connection is established by connecting an instructor device set as a master PC in a PC lab and a learner device having n * n (n is an integer of 2 or more) set as a slave PC to a local area network. In addition, by displaying multiple screens of a plurality of learner devices in real time on the screen of the instructor device, there is an advantage in that the progress of learning can be easily compared between learners in the instructor device.

In addition, when the screen search time interval assigned to each learner device elapses, the contents of each screen of all learner devices are sequentially displayed on the screen of the instructor device, so that the screen contents of all learner devices can be checked on one device. There is an advantage.

Claims (7)

Connecting a plurality of computer devices used by different users to each other via a predetermined communication network; Setting up at least one slave device having at least one master device of said plurality of computer devices and controlled by said master device; And And controlling, by the master device, a content output from a screen of at least one slave device of the slave device to be simultaneously output on a predetermined area of its own screen. The method of claim 1, wherein the master device, In the own screen, the screen information of the slave device is output for a predetermined time, Select the screen of the slave device output from its own screen to input predetermined information, and accordingly transmits the predetermined information to the slave device so that the predetermined information is generated in the slave device in the same way Multiple display method. In an education system in which a plurality of computer devices are connected to each other through a predetermined communication network, Dividing a screen of at least one of the plurality of computer devices into a predetermined area; Providing an address book of the plurality of computer devices, and processing the address book so that they can exchange information with each other; Designating a screen of at least one computer device among the plurality of computer devices in a predetermined area of the divided screen; And And outputting screen information of the designated computer device on the divided screen. The method of claim 3, wherein the outputting step, Connecting a session of the computer device designated to the divided area with the session of the arbitrary computer device; Transmitting the screen information to the any computer device in accordance with the connection of the session; Outputting the transmitted screen information in a divided area of the arbitrary computer device; When the screen information is output, determining whether a search period is performed, and if it is determined that the predetermined period has not been determined in the search period determination, repeating from the transmitting step; And If it is determined that the predetermined period has elapsed, releasing a session between the computer device designated as the divided area and the arbitrary computer device. The method of claim 3, wherein the dividing comprises: A master device and a slave device are respectively set among the plurality of computer devices by a preset program. Accordingly, the arbitrary computer device is set as the master device, and the remaining computer device except the arbitrary computer device is set as the slave device. The method of claim 3 or 6, wherein the processing of the address book information comprises: Waiting for the master device to receive screen information from any slave device; Determining, by the master device, whether a packet indicating the presence of the slave device has been received; If it is determined that the packet has been received, searching for the existence of a corresponding item in the master device; Determining whether the corresponding item already exists in the master device; If it is determined that there is no corresponding item in the determining of the corresponding item, adding the new item; And If it is determined that the new item already exists in the corresponding item, updating the time information and the status information of the new item. The method of claim 6, wherein the master device, The address book is provided to search for the corresponding item. The address book, An index indicating a sequence number in the address book; The slave device name; An IP address representing a unique address on a network assigned to the slave device; A time stamp indicating a date and time that the existence of the slave device is recognized; And And a state indicating a communication state between the master device and the slave device.