CN112486437A - Method for printing in Web application by cross-platform and cross-browser - Google Patents
Method for printing in Web application by cross-platform and cross-browser Download PDFInfo
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- CN112486437A CN112486437A CN202011506697.1A CN202011506697A CN112486437A CN 112486437 A CN112486437 A CN 112486437A CN 202011506697 A CN202011506697 A CN 202011506697A CN 112486437 A CN112486437 A CN 112486437A
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- 238000007639 printing Methods 0.000 title claims abstract description 106
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000004891 communication Methods 0.000 claims abstract description 14
- 238000009877 rendering Methods 0.000 claims abstract description 9
- 238000005516 engineering process Methods 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000011161 development Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 2
- 238000013475 authorization Methods 0.000 claims 1
- 238000012360 testing method Methods 0.000 claims 1
- 230000000007 visual effect Effects 0.000 abstract 4
- 238000010586 diagram Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010017 direct printing Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002085 persistent effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/12—Digital output to print unit, e.g. line printer, chain printer
- G06F3/1201—Dedicated interfaces to print systems
- G06F3/1202—Dedicated interfaces to print systems specifically adapted to achieve a particular effect
- G06F3/1203—Improving or facilitating administration, e.g. print management
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/12—Digital output to print unit, e.g. line printer, chain printer
- G06F3/1201—Dedicated interfaces to print systems
- G06F3/1202—Dedicated interfaces to print systems specifically adapted to achieve a particular effect
- G06F3/1211—Improving printing performance
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/12—Digital output to print unit, e.g. line printer, chain printer
- G06F3/1201—Dedicated interfaces to print systems
- G06F3/1223—Dedicated interfaces to print systems specifically adapted to use a particular technique
- G06F3/1236—Connection management
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/12—Digital output to print unit, e.g. line printer, chain printer
- G06F3/1201—Dedicated interfaces to print systems
- G06F3/1223—Dedicated interfaces to print systems specifically adapted to use a particular technique
- G06F3/1237—Print job management
- G06F3/1242—Image or content composition onto a page
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/12—Digital output to print unit, e.g. line printer, chain printer
- G06F3/1201—Dedicated interfaces to print systems
- G06F3/1278—Dedicated interfaces to print systems specifically adapted to adopt a particular infrastructure
- G06F3/1285—Remote printer device, e.g. being remote from client or server
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- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Accessory Devices And Overall Control Thereof (AREA)
Abstract
The invention provides a technical scheme, a system and a user client for controlling a system printer by a browser Web application, wherein the technical scheme comprises the following steps: the browser and system communication protocol, the rendering engine which analyzes the printing content of the browser into the content which can be identified by the printer, and the printing control interface; the system comprises a set of visual webpage typesetting engines, a set of visual webpage typesetting engines and a set of visual webpage typesetting engines, wherein the visual webpage typesetting engines can manage the styles and printing templates of the printing contents; the user client comprises a local running printing service software which is used for being installed in a local computer or a remote server to realize various contents contained in the technical scheme. The method and the device for printing the Web application achieve the purposes of improving the consistency and accuracy of cross-platform and cross-browser printing of the Web application, and can solve a plurality of problems in complex printing scenes.
Description
Technical Field
The technology relates to a technology for controlling local printers by Web applications under different operating system platforms through different browsers, in particular to a general communication protocol established, so that the printing effect consistency of various Web applications in cross-platform and cross-browser is realized.
Background
The current WEB application development is very popular, and the main reason is that the rule of a WEB application client is very simple, easy to learn, easy to maintain and easy to release, and the development difficulty is reduced. However, printing of WEB applications has been a difficult problem, and especially, it is difficult to complete label printing (such as parcel form, shipping label, etc.) and ticket printing (such as retail receipt) in applications, and the difficulty is how to accurately print contents to be printed on the label and ticket, accurately control paging, and achieve high-speed continuous printing.
HTTP is a standard for requests and responses between clients (users) and servers (websites), and typically uses the TCP protocol. A request is initiated by the HTTP client to create a TCP connection to a designated port (80 ports by default) of the server. The HTTP server listens for the client's request at that port. Upon receiving the request, the server returns a status, such as "HTTP/1.1200 OK," to the client, along with the returned content, such as the requested file, an error message, or other information. Many older browsers support only the HTTP protocol.
Unlike HTTP, WebSocket provides full duplex communication. WebSocket is a network transmission protocol, which makes data exchange between a client and a server simpler and allows the server to actively push data to the client. In the WebSocket API, the browser and the server only need to complete one handshake, persistent connection can be established between the browser and the server, bidirectional data transmission is carried out, low overhead is achieved, and real-time data transmission between the client and the server is facilitated. The server can be implemented in a standardized way without the client first requesting content and allowing messages to pass back and forth while keeping the connection open. In this way, a two-way persistent dialog can be made between the client and the server, which protocol is supported by most modern browsers.
Disclosure of Invention
The invention aims to establish a communication protocol and a rendering engine of a universal browser and a local or cloud printer, and establish the communication between the browser and printing service software installed on a system at a certain position by utilizing HTTP and WebSocket double protocols, and because the communication protocol is supported by a cross-platform and cross-browser, the cross-platform and cross-browser printing can be realized; by directly calling a printing interface of a system, the content of a set of Web application is converted into a rendering engine which can be accurately identified by a system printer, so that the problems brought forward in the background are solved.
In order to achieve the purpose, the invention provides the following technical scheme: by utilizing the HTTP and the WebSocket protocol, the printing content is accurately controlled, and meanwhile, the problems that the existing control and plug-in schemes cannot cross platforms and are inconvenient to develop and maintain are eliminated. The Web application selects the HTTP or the WebSocket protocol automatically according to the needs, sends an instruction to the server through the Web end, and realizes the communication between the browser and the printing service through the protocol, and a set of native printing rendering engine is realized through a printing module of the server, thereby realizing the accurate control of the Web application on the printing and realizing the consistency of the printing effect.
Compared with the prior art, the method has the advantages that the problem of communication between a cross-platform and a cross-browser and a printer is solved, the consistency of printing effect is ensured, and the method has the following advantages:
1. the full-platform cross-browser content is consistent, the WYSIWYG HTML is printed, complex drawing commands and complex parameters do not need to be written, the printing content with luxuriant pictures and texts can be constructed by using the HTML + CSS, and the printing data is efficiently and flexibly organized.
2. The function is abundant, and the laminating needs, such as associated data field, style modification, form paging, independent element paging in the page, vertically and horizontally print, developments width and height, continuous accurate suit of paging, mirror image printing etc..
3. The installation, upgrading and debugging are convenient, the service software realized by the technology is only 1.5 million, the downloading is prompted when the system of the used software is printed, the automatic detection is not installed, or the automatic upgrading is monitored when the version is upgraded, the software can debug the input content, and the deployment is convenient.
4. Supporting cloud printing, the printing service can be deployed in any server of a local area network or other networks. If you need to use the device from other non-Windows systems, such as Android, iOS and Linux devices, the cloud printing function can be realized, the cloud printing can realize the centralized printing of the server side and the printing of the cloud printer, and the client side does not need to be installed.
5. The default parameters are automatic printing, no preview and no prompt are used for direct printing, and when the Web program is used for printing, some printing parameters are often required to be controlled, such as which printer to print, the size, the direction, the margin, the number of copies, the designated page, whether to print on both sides, and the like. The software can enable a user to set the default parameters through a program, and the user does not need to set the default parameters in a popped printer selection dialog box, so that the user can skip printing preview pages to directly print, and the printing efficiency can be greatly improved.
Drawings
FIG. 1 is a core technology framework of the present invention;
FIG. 2 is an operating system print architecture (exemplified by a Windows system);
FIG. 3 is an operating system printing process (exemplified by a Windows system);
FIG. 4 is a schematic diagram of printing high level pagination in accordance with the present invention;
FIG. 5 is a Web browser based composition editor of the present invention;
fig. 6 is a schematic flow chart of the technical solution of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a core technical framework, the present solution realizes a data rendering engine, a communication service, a Web call interface, and a composition editor from bottom to top by relying on a printer interface provided by an operating system, and the roles and implementation manners assumed by these are described in turn below.
The data rendering engine is used for analyzing the printing request and the printing content sent by the Web application program based on the browser, and sending the printing instruction and the printing content to the printer on the local or remote server, and is the most core part in the whole technology.
The operating system provides the underlying print interface for upper level software or system calls, as exemplified by the Windows system.
Referring to fig. 2, a system printing structure is shown. Description of the drawings:
PrintDocument: is the most important class. Almost all print classes have a relationship with this class. To print a document, an instance of PrintDocument is required.
PrintController: the classes control the flow of print jobs. Events of print start, print each page, and print end are provided. Specific classes derived from PrintController are StandardPrintController and PreviewPrintController.
PrintSettings: the class may obtain print and set printer configurations. This class configuration is performed by the PageSetupDialog class.
PrintDialog: the class determines which printer to use for printing and how to configure the PrinterSettings.
Graphics: the device contents of the printer may be accessed and character strings, lines and curves may be sent to the printer.
PageSetupDialog: a print page is set.
PrintPreviewDialg: and printing the preview page.
Referring to FIG. 3, a system Print flow diagram, an application must call the Print () method of the PrintDocument, starting a call sequence. Since the PrintDocument itself does not blame the Print stream, printing is done by the PrintController by calling the Print () method of this class. The print controller now performs an operation of notifying PrintDocument to start printing by calling OnBeginPrint (). If an application performs some operation at the beginning of a print job, an event handler must be registered in the PrintDocument so that a notification is received in the application class. As in the above figure, it is assumed that the handler OnBeginPrint () is registered, so this handler should be called in the PrintDocument class.
After the start phase is completed, the PrintController enters PrintLoop () and calls the OnPrintPage () method in the PrintDocument class for each page to be printed. OnPrintPage () calls all the PrintPage event handlers. This process must be performed for each page, otherwise nothing will be printed.
The print code may be executed in a printdocument. The handler is called for each print page. If a print job requires only one execution of the print code, the Beginprint and Endprint events and handlers must be executed. After printing the last page is completed, the PrintController calls OnEndPrint () in the PrintDocument class. The handler to be called here can also be executed.
Therefore, the following must be made to realize printing:
1. print the file, is used for printer. This is instantiated with the PrintDocument class.
2. The content being printed. The process gets the printed content with the PrintPage event method in PintDocument.
The method comprises the following steps:
1. the PrintDocument class is instantiated. Declaring a document to be printed.
2. Printdocument.printpage event is added, and the method of this event is used to get the printed content.
3. Print () method is called to print the content, and this method calls the method of the PrintPage event with the help of the printcontroller class before printing.
4. The print text is drawn in the PrintPage event for obtaining the print content, and the method returns to the printdocument () method after the method is finished, and the printing is executed.
Through the processing, the printing content of the printer of the local or remote server can be controlled, and then the printing request and the printing content sent by the Web application program of the browser are analyzed, namely a set of rules are required to be agreed with the browser, and the printing data is sent according to the rules, so that the service software can conveniently identify and analyze the printing content of the printer. The printing service of the operating system provides the capability of printing the rendered web page directly, which is the most common way to solve most common printing scenes, and the disadvantages are that the printing service is easily influenced by different operating systems, browsers and resolutions, and the printed content may have slight differences. The other method is to convert the browser and the printer once, decompose various elements in the webpage, convert the webpage content into text, lines, figures and pictures which can be identified by the printer and print the contents by using an interface provided by service software.
Thus, our print interface, Javascript API, provides the following core interfaces:
html PRINT for direct printing of web content.
Content PRINT for converting elements within a web page, such as text, lines, graphics, pictures, font sizes, fonts, and their coordinate positions.
Set _ CONTENT _ PRINT for performing high-level control of PRINT CONTENTs such as normal sorting, high-level sorting, mirror sorting, and the like. Ordinary paging is well understood, namely paging is controlled when paging is needed according to contents and paper, advanced paging means that partial contents in a page are paged, for example, referring to fig. 4, advanced paging schematic diagrams, for example, table contents in the page need paging as the number of rows increases, but contents such as titles, money loss and the like need to appear every page, and at this time, control can be performed, paging is performed for every row of the table, and contents of other pages repeatedly appear every page. The mirror image paging means that some documents are not multi-layer multi-linked which can be duplicated, but are multi-linked up and down, the contents of the upper and lower two links are the same, and then on the basis of the previous high-level paging, each page of contents of the previous paging is repeated in the upper and lower two links, so that a complete page of contents is printed. Set PRINT for setting printing parameters such as direction, margin, paper size.
The Web application selects different interfaces according to actual conditions, submits a printing request for the content on the webpage, and the service software starts to render the content after receiving the printing request. How the service software receives the content submitted by the webpage needs a communication service, namely, the communication service based on the HTTP or WebSocket protocol is responsible for delivering the content. According to different used scenes, the HTTP protocol or the WebSocket protocol can be flexibly selected, the communication protocol is a custom scheme, specific implementation is omitted, and a channel for transmitting contents can be normally established as long as the interface selects the specific protocol.
The method comprises the steps that a channel is established, Web application can submit a printing request to service software at any time, and then specific contents to be printed are determined.
Referring to fig. 5, a schematic diagram of a layout editor is shown, where the layout of the print content includes two parts, one is a page layout design, and the part is fixed, and is similar to the PPT, and can be conveniently operated; the other is the component association data field of the page, which is dynamic and varies according to what is actually to be printed. For example, in a sales order bill printed by a retail store, the real payment amount is a page component, and besides the position, size and font of the component, the data field of the real payment amount in the order is also associated with the component, so that when the bill is printed by the Web application, the component on the page can be replaced by real data corresponding to each bill in real time. The typesetting editor can store a plurality of sets of templates, different templates can be selected according to different printing scenes, and the templates can be led in and out, so that the templates can be conveniently and rapidly transferred among different devices.
Referring to fig. 6, a final technical flowchart illustrates that both a local computer and a remote server may be installed with print service software, both of which are connected to a printer, and the local computer may directly submit a print job to the printer connected to the local computer or submit the print job to the remote server in the cloud; the mobile devices such as notebook computers and mobile phones in the local area network can also submit the print tasks to the local computer and can also submit the print tasks to the remote server at the cloud end. Before submitting a printing task, a typesetting editor is needed to create a printing template, then all kinds of equipment can submit printing contents to equipment which is provided with printing services and connected with a printer through the printing template, and after the printing services receive the printing contents, a printing rendering engine analyzes the printing contents and converts the printing contents into data which can be recognized by the printer, so that consistent contents are printed.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A technical scheme for controlling a system printer by a browser Web application is characterized by comprising the following steps:
receiving a printing request initiated by a user in a browser;
establishing a transmission channel, calling an interface provided by a printing service, and transmitting a printing request initiated by a user to a printer;
converting a printing request to be received by a printer into content which can be identified by the printer;
and calling a printer, executing a printing process, and printing a result consistent with the user request.
2. The method of claim 1, wherein prior to receiving a print request initiated by a user at a browser, further comprising:
providing a content style used by a user for previewing a printing request to be submitted;
providing a method for allowing a user to adjust the style of the printing content after the user previews the printing request containing the content;
providing a method for saving the printing content style by a user and enabling the style to be used in a required place;
before a user submits a printing request, the content which is seen by the user and is definitely to be printed is consistent with the content which the user wants, if so, the printing request is created, and if not, the content can be continuously adjusted;
and when the user is under different browsers of different operating system platforms, the operation can be completely and consistently performed.
3. The method of claim 1, wherein before establishing the transmission channel and invoking the interface provided by the printing service, the method further comprises:
calling a printing interface provided by an operating system, listing available printers, and selecting the printers to send printing instructions;
providing communication protocols which can be recognized by different browsers, including HTTP and WebSocket;
whether a transmission channel based on the selected communication protocol is established can be verified at any time;
providing a development interface which can be understood and used by a Web application developer and a calling mode description of the interface;
test data cases based on a development interface are provided, as well as fault handling schemes.
4. The method of claim 1, wherein prior to transmitting the user-initiated print request to the printer, further comprising:
detecting that a printing service client is installed and deployed in a local or remote computer environment, and if the printing service client is not deployed, providing a method for downloading and installing;
detecting whether a printing service client in a local or remote computer environment has a new version, and if so, providing an updating method;
detecting whether a print service client in a local or remote computer environment is faulty, and if so, providing a detection and repair method.
5. The method of claim 1, further comprising:
analyzing the printing content and the printing setting submitted to the printing service client from the Web application by the user;
rendering the analyzed printing content into a content which can be printed by a printer;
and transmitting the analyzed printing setting to a printer.
6. The method of claim 1, further comprising:
the rendering method of the printing service client can ensure that the same printing contents submitted by different operating systems and different browsers have consistent printing results;
when the print results of the same contents are inconsistent, a feasible solution is provided.
7. A cross-platform and cross-browser technology is characterized in that the technology is not limited to a specific operating system and a browser run by the operating system.
A Web application, wherein said applications must all be run in a browser, accessed through a Web site or IP address, and some applications require login to obtain authorization before they can be used.
9. A printing technique is characterized in that the technique needs to control a printer connected with a local computer or a remote server to execute printing through a system and a client.
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| CN113434100A (en) * | 2021-08-27 | 2021-09-24 | 统信软件技术有限公司 | Cloud printing method, computing device and storage medium |
| CN113569180A (en) * | 2021-07-28 | 2021-10-29 | 中国电子科技集团公司第二十八研究所 | Universal browser extension system |
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