CN1474267A - Method for accurately obtaining computer screen change - Google Patents

Method for accurately obtaining computer screen change Download PDF

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CN1474267A
CN1474267A CNA021260257A CN02126025A CN1474267A CN 1474267 A CN1474267 A CN 1474267A CN A021260257 A CNA021260257 A CN A021260257A CN 02126025 A CN02126025 A CN 02126025A CN 1474267 A CN1474267 A CN 1474267A
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module
message
hook
process
api
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CN1179269C (en
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孙成昆
刘渤
赵俊先
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联想(北京)有限公司
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Abstract

The method of accurately obtaining computer screen change includes the following steps: completing by means of a main console module the connection of API hook submodule, which intercepts image output function, obtains the output area and sends the information to the main console module, before executing the course code; loading one message hook submodule into the main console module to hang the message hook for the operation system, intercept user input event and screen changing message and sends the information to the main console module; processing the message flow in the the main console module, merging the screen changing areas and grasping the image of the areas. The present invention completes connection before executing course code, and thus can monitor the whole process of the system and obtain the change in screen accurately. The present invention may be used reliably in remote monitoring, electronic classroom and other fields.

Description

一种准确获取计算机屏幕变化的方法 An accurate way to get a computer screen changes

技术领域 FIELD

本发明涉及计算机技术领域,特别是指一种准确获取计算机屏幕变化的方法。 The present invention relates to computer technology field, and particularly to a method of obtaining accurate computer screen changes.

现有技术中获取计算机屏幕变化的方法,需要将显示存储器中的前一帧图像数据存储起来,再令当前帧图像数据与前一帧图像数据进行比较,从而获得图像变化值。 Obtaining the prior art method of changing a computer screen, it is necessary to display the previous frame image data stored in the memory, and then let the current frame image data is compared with the previous frame image data to obtain an image change value. 这种方法的缺点在于:无论屏幕是否变化,计算机都需要周期性地(例如每秒30次)抓取当前全部屏幕图像,将之与上一周期存储的图像进行比较。 A disadvantage of this method is that: whether or not a screen change, the computer needs to periodically (e.g., 30 times per second) the current fetch full screen image, the image is compared with the previous period stored. 因而将占用大量计算机资源。 Thus it will take up a lot of computer resources.

为达到上述目的,本发明的技术方案是这样实现的:一种准确获取计算机屏幕变化的方法,该方法至少包括以下步骤:A、通过一个控制台主模块,在进程代码执行前完成一应用程序编程接口(API)钩子模块的挂接,该API钩子模块拦截图像输出函数,获取其输出区域,并通过消息发送给控制台主模块;所述的控制台主模块并且载入一消息钩子模块,为操作系统挂接消息钩子,拦截用户输入事件以及引起屏幕变化的消息,并将该消息发送给控制台主模块;B、控制台主模块处理接收到的消息流,合并屏幕变化的区域,抓取该区域的图像。 To achieve the above object, the technical solution of the present invention is implemented: obtaining an accurate variation of the computer screen, the method comprising at least the following steps: A, by a master console module, a complete application code is executed before the process (API) articulated hook module programming interface, API hook module intercepting the image output function, the output area acquisition, and transmits a message to the main console module; said master module and load a console message hook module, hook hook message to the operating system, and intercepting user input events causing the screen to change message, and sends the message to the main console module; B, a main console module processes the received message flow area, combined screen changes, focus taking an image of the region.

其中,步骤A所述的API钩子模块的挂接过程进一步包含:控制台主模块将一个进程挂接模块插入到操作系统进程空间,用于拦截进程创建函数,在系统调用进程创建函数时,将API钩子模块插入到新创建的进程空间中。 Wherein the hook process module API hook according to step A further comprising: a main console module attached to a process module into the operating system process space, for intercepting process creation function creating process when a system call function, the API hook process module is inserted into the newly created space.

其中,所述的API钩子模块插入到新创建的进程空间后,执行以下步骤:a、遍历进程中运行的所有模块并为每个模块挂接API钩子;b、监视操作系统的模块加载函数并为获取过程地址函数(GetProcAddress)挂接API钩子;c、将所拦截API引起的变化区域信息转化为矩形坐标发送给控制台主模块。 Wherein said API hook process module inserted into the newly created space, perform the following steps: all the modules a, and traversal process running for each module API hook mount; B, the operating system monitoring module loading functions, and process to obtain address of the function (the GetProcAddress) articulated API hook; c, caused by the change API region the intercepted information into rectangular coordinates to a master console module.

其中,步骤B所述的控制台主模块是利用图形驱动接口(GDI),或直接绘图应用程序接口(DirectDraw API)抓取屏幕变化区域的图像。 Wherein said step B is the master module using the console graphical driver interface (the GDI), or direct drawing application program interface (DirectDraw API) screen capture image change region.

其中,在步骤A中,所述的消息钩子模块拦截系统消息与用户输入事件后,进入一消息处理函数,该消息处理函数判断上述消息或事件是否能够引起屏幕变化,如是则将变化区域信息转化为矩形坐标,发送给控制台主模块。 Wherein, in step A, the hook module message interception system user input event message into a message handler, the message handler determines whether or not the message or event can cause a screen change, then the change area information into the case rectangular coordinates, the main module is sent to the console.

本发明避免了现有技术中无论是否屏幕发生变化,都要周期性地抓取屏幕图像的要求,通过消息钩子和API钩子收集屏幕的变化,确定屏幕变化区域,抓取屏幕变化区域的图像,极大地提高了处理效率,节省了计算机资源。 The present invention avoids whether screen changes prior art, required to be periodically crawling the screen image, the screen changes through a message collect hooks and API hook, changes the screen region is determined, the captured image changes in a screen region, greatly improve the processing efficiency, saving computer resources.

由于本方法要求在进程代码执行前完成挂接,用API函数拦截图形输出函数,并且用挂接消息钩子拦截各种消息,因此,能对系统的全部运行过程进行监测,从而准确获取屏幕变化的数据。 Since the present method requires the process to complete before the code is executed articulated, graphical output function interception API function, and various messages intercepted message hook with a hook, and therefore, can monitor the entire process of operation of the system, the screen changes to accurately obtain data. 能够可靠地应用于远程监控,电子教室等领域。 It can be reliably used in remote monitoring, electronic classrooms and other areas.

本发明按照利用Windows的消息钩子和API钩子发现屏幕变化并获得变化区域,继而抓取变化区域图像的思路进行设计。 The present inventors have found according to the message using the Windows API hook hooks and screen change, and change area is obtained, and then gripping the idea of ​​changing area image design.

钩子(HOOK)机制是被Windows程序经常使用的技术之一,程序员可以利用设置Windows钩子扩展函数(SetWindowsHookEx)来拦截一些Windows消息和由此引发的事件;也可以利用替换程序中使用的应用程序编程接口(API)的方法,对相关Windows API进行拦截。 Hook (HOOK) mechanism is one technique is frequently used by Windows programs, programmers can use to set up Windows hooks spread function (SetWindowsHookEx) to intercept some of the Windows messages and events consequent; can also use the application to replace used in the program programming interface (API), the relevant Windows API to intercept.

当为某个Windows进程挂接Windows消息钩子(Windows MessageHook)时,存放消息处理函数的动态链接库(DLL)会被映射进该进程中,这样就将一个DLL插入到另一个进程的地址空间中,从而进行拦截。 When attached Windows message hook (Windows MessageHook) for a Windows process, store the message processing function of the dynamic link library (DLL) will be mapped into the process, such a DLL will be inserted into another process's address space, thus intercept. 这个方法的优点是十分简便,缺陷在于,进程仅在接受某种消息时,要插入的DLL才会被映射,在这之前,程序的运行不受控制,所以需要与API钩子的应用相结合。 The advantage of this method is very simple, defects that process only when receiving some messages to insert DLL will be mapped, before that, run the program out of control, it is necessary to combine with the API hook applications.

本发明中,API钩子模块用于拦截图像输出函数,获取其输出区域,并通过消息发送给控制台主模块。 In the present invention, the API hook module for intercepting an image output function, the output area acquisition, and transmits a message to the console via the main module. 针对API钩子模块的挂接,需要控制台主模块将一个进程挂接模块插入到操作系统进程空间,用于拦截进程创建函数,在系统调用进程创建函数时,将API钩子模块插入到新创建的进程空间中。 API hook for hook module, the main module will need a console attached process module into the process space of the operating system, used to intercept the process of creating a function, when you create a system function in the calling process, will be inserted into the newly created module API hooks process space.

API钩子模块插入到新创建的进程空间后,执行以下步骤:a、遍历进程中运行的所有模块并为每个模块挂接API钩子;b、监视操作系统的模块加载函数,包括ASCII版本的LoadLibrary函数和Unicode版本的LoadLibraryEx函数,同时为获取过程地址函数(GetProcAddress)挂接API钩子;c、将所拦截API引起的变化区域信息转化为矩形坐标发送给控制台主模块。 After the API hook process module is inserted into the newly created space, perform the following steps: all modules a, traversing the process running and hook API hooks for each module; b, operating system monitoring module loading functions, including ASCII version of LoadLibrary Unicode version of LoadLibraryEx functions and function, as well as a function of the address acquisition process (the GetProcAddress) articulated API hook; C, API-induced change area information into the intercepted transmission to the console main module rectangular coordinates.

通过消息钩子模块和在进程代码执行前挂接的API钩子模块,计算机可以准确地发现屏幕变化以及变化区域,从而实现准确抓取。 And a hook module by a message code is executed before the process module mounted API hook, the computer can accurately find and change area screen change, thereby achieving accurate gripping.

图1为本发明的功能模块示意图。 1 a block diagram schematic of the present invention. 其主要的流程为:为控制台主模块101挂接消息钩子模块102,同时,在控制台主模块101中插入进程挂接模块103,在进程挂接模块103插入新进程时,挂接API钩子模块104,将消息钩子和API钩子拦截到的屏幕变化发送给控制台主模块,由控制台主模块再进行处理。 The main flow is: the main module 101 is mounted console message hook module 102, while the insertion process module 103 is mounted in the main console module 101, the module is mounted in the process of inserting a new process 103, API hook articulated sending module 104, a message intercepting API hook to hook and the screen changes to the console main module, the main module is processed again by the console. 下面就每一模块分别说明如下:图2为本发明的控制台主模块流程图。 Here each module are as follows: FIG console main module 2 of the present invention. FIG. 启动主模块后,步骤201:载入消息钩子模块,为系统挂接消息钩子;步骤202:利用远程线程创建函数将进程挂接模块插入系统进程中,在所有挂接完成后,执行步骤203进入消息循环。 After starting the main module, Step 201: Loading message hook module, a system message attached hook; Step 202: Create function using a remote process thread hook process module into the system, after completion of all the hook, step 203 is performed to enter message loop.

步骤203:判断当前消息队列是否空闲,如果是执行步骤204,抓取更新区屏幕图像,返回步骤203,重新判断;否则执行步骤205。 Step 203: judging whether the current message queue is idle, if step 204 is performed, the screen update area image grab returns to step 203, re-judgment; otherwise, step 205 is executed.

步骤205:判断消息类型,如果是屏幕更新消息,执行步骤206,进行相应消息处理,执行步骤207,将消息中的更新区与当前区域合,利用有关的图形驱动接口(GDI)或直接绘图应用程序接口(DirectDraw API)抓取该区域的图像,完成一次抓取过程,返回步骤203;如果是系统退出消息,执行步骤208,卸载消息钩子模块;执行步骤209,卸载进程挂接模块,退出主模块。 Step 205: determining the message type, if the screen update message, step 206, the corresponding message processing, step 207, the message is updated region with the current region engaged by associated graphical driver interface (GDI) or direct drawing application program Interface (DirectDraw API) in the region of the captured image, to complete a crawl, returns to step 203; if the system exit message, step 208, the message hook unload module; step 209, the uninstall process mounting module, the main exit module.

图3为本发明的消息钩子模块流程图。 FIG 3 message hook module of the present invention. FIG. 载入本模块后,步骤301:为操作系统设置消息钩子;步骤302:拦截系统消息与用户输入事件;步骤303:进入消息处理函数;步骤304:判断是否是引起屏幕变化的消息或事件,如果是执行步骤305,消息处理函数通过重新映射实际屏幕的绝对坐标将其转化为矩形坐标,并将转化的更新区发送给控制台主模块;否则执行步骤306,交给系统继续执行原操作。 After this module is loaded, step 301: the operating system provided message hook; Step 302: a user input message interception system event; Step 303: an incoming message handler; Step 304: determining whether a screen change is caused by an event or message, if step 305 is executed, the message processing function by the absolute coordinate remapping the converted actual screen is rectangular coordinates, and sends the transformed area update to the console main module; otherwise, execute step 306, continue to the original operating system. 至此,所有引起屏幕变化的系统消息及用户输入事件均被拦截。 At this point, all screen changes caused by system messages and user input events are intercepted.

图4为本发明的进程挂接模块流程图,系统进程加载该模块后,执行步骤401,用该模块替换系统进程中的CreateProcessA和CreateProcessW进程创建函数;步骤402:创建新进程,并将其挂起;步骤403:将API钩子模块插入到新创建进程的地址空间;步骤404:恢复该进程的执行。 After the process of the present invention. FIG. 4 a flowchart mounting module, the module loading system process, step 401 is executed, the module is replaced with the process of CreateProcessA system process creation function and CreateProcessW; Step 402: create a new process, and hang it play; step 403: the API hooks module into the newly created process's address space; step 404: resume execution of the process. 这样所有新创建的进程都会被挂接API钩子。 So that all newly created process will be hooked API hooks.

进程挂接API钩子模块后,就进入了API的钩子程序,图5即为本发明的API钩子模块流程图。 When the process is articulated hook module API, the API enters the hooks, and FIG. 5 is the API hook module of the present invention. FIG. 步骤501:遍历进程中运行的所有模块,并为每个模块挂接API钩子;步骤502:为了防止进程在运行中动态加载别的模块,还必须监视操作系统的模块加载函数,由于Unicode的问题,实际上要监视ASCII版本的LoadLibrary函数和Unicode版本的LoadLibraryEx函数;步骤503:为GetProcAddress进行挂接;步骤504:拦截引起屏幕变化的API函数,并将变化转换为矩形坐标发送给控制台主模块。 Step 501: the process runs through all modules and each module is mounted API hook; Step 502: Process for preventing other modules dynamically loaded at runtime, the operating system must monitor the module loading functions, since the problems Unicode , to actually monitor an ASCII version of the function LoadLibrary function and LoadLibraryEx Unicode version; step 503: mount it to the GetProcAddress; step 504: intercepting API function causes the screen changes, and changes to a console main module converts rectangular coordinates . 至此,所有引起屏幕变化的图像输出函数均被拦截。 So far, all the changes caused by the screen image output function are blocked.

这样,在进程代码执行前就完成了所有进程的挂接,同时对系统的全部运行过程进行监测,从而可以准确获取屏幕的变化的数据。 In this way, before the process is complete articulated code execution of all processes, while the process of monitoring the entire operation of the system, so you can get accurate data change screen.

以上所述仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。 The preferred embodiment of the above embodiments of the present invention only but are not intended to limit the present invention, any modifications within the spirit and principle of the present invention, the, equivalent replacement, or improvement, it should be included in the present invention. within the scope of protection.

Claims (6)

1.一种准确获取计算机屏幕变化的方法,其特征在于至少包含以下步骤:A、通过一个控制台主模块,在进程代码执行前完成一API钩子模块的挂接,该API钩子模块拦截图像输出函数,获取其输出区域,并通过消息发送给控制台主模块;所述的控制台主模块并且载入一消息钩子模块,为操作系统挂接消息钩子,拦截用户输入事件以及引起屏幕变化的消息,并将该消息发送给控制台主模块;B、控制台主模块处理接收到的消息流,合并屏幕变化的区域,抓取该区域的图像。 An accurate method of obtaining a computer screen changes, characterized by comprising at least the following steps: A, by a master console module, a complete articulated hook module API code is executed before the process, the image output API hooks intercept module function, which acquires the output area, and the message sent from the master module to the console; master console module according to a message and loading hook module, the operating system message hook mount, and intercepting user input events causing the screen to change message , and sends the message to the main console module; B, a main console module processes the received message flow area, the combined screen changes, the captured image region.
2.如权利要求1所述的准确获取计算机屏幕变化的方法,其特征在于在步骤A中,API钩子模块的挂接过程进一步包含:控制台主模块将一个进程挂接模块插入到操作系统进程空间,用于拦截进程创建函数,在系统调用进程创建函数时,将API钩子模块插入到新创建的进程空间中。 2. The method of obtaining accurate computer screen change according to claim 1, wherein in step A, the API hook hook process module further comprises: a main console module attached to a process module into the operating system process space for the interception process creation function, when you create a system function call process, the API hook module is inserted into the process space newly created.
3.如权利要求2所述的准确获取计算机屏幕变化的方法,其特征在于在步骤A中,所述的API钩子模块插入到新创建的进程空间后,执行以下步骤:a、遍历进程中运行的所有模块并为每个模块挂接API钩子;b、监视操作系统的模块加载函数并为获取过程地址函数(GetProcAddress)挂接API钩子;c、将所拦截API引起的变化区域信息转化为矩形坐标发送给控制台主模块。 3. The accuracy of the acquisition method of claim 2 changes the computer screen, wherein in step A, the API hook process module into the newly created space, perform the following steps: a, the process of traversing run all modules and each module API hook to hook; b, load monitoring module operating system functions to obtain and process function address (the GetProcAddress) articulated API hook; c, caused by the change API region the intercepted message into a rectangular coordinates sent to the console main module.
4.如权利要求2所述的准确获取计算机屏幕变化的方法,其特征在于在步骤A中,所述的控制台主模块利用远程线程创建函数将进程挂接模块插入到操作系统进程空间。 4. accurate claim 2 acquisition method changes the computer screen, wherein in step A, the master module using the remote console function to create a thread hook process module into the operating system process space.
5.如权利要求1所述的准确获取计算机屏幕变化的方法,其特征在于在步骤B中,控制台主模块利用图形驱动接口(GDI),或直接绘图应用程序接口(DirectDraw API)抓取屏幕变化区域的图像。 5. The exact method of claim 1 acquires a change of a computer screen, wherein in the step B, the console main module using a graphical driver interface (the GDI), or direct drawing application program interface (DirectDraw API) screen capture image change region.
6.如权利要求1所述的准确获取计算机屏幕变化的方法,其特征在于在步骤A中,所述的消息钩子模块拦截系统消息与用户输入事件后,进入一消息处理函数,该消息处理函数判断上述消息或事件是否能够引起屏幕变化,如是则将变化区域信息转化为矩形坐标,发送给控制台主模块。 6. The method of obtaining accurate computer screen change according to claim 1, wherein in step A, the hook module message interception system user input event message into a message handler, the message handler determining whether the event can cause a message or change the screen, will change the case of a rectangular area into coordinate information, the main module is sent to the console.
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CN100501735C (en) 2005-06-08 2009-06-17 罗技欧洲公司 System and method for transparently processing multimedia data
CN100568812C (en) 2004-08-12 2009-12-09 海信集团有限公司 Registration protection method
CN100583022C (en) 2006-09-27 2010-01-20 联想(北京)有限公司 Method for capturing computer screen image
CN1764103B (en) 2004-10-20 2010-05-12 联想(新加坡)私人有限公司 Privacy protection method and apparatus for remote control
CN101984402A (en) * 2010-11-16 2011-03-09 广东威创视讯科技股份有限公司 Image acquisition and compression method and related device
CN101436145B (en) 2007-11-15 2012-02-01 盛乐信息技术(上海)有限公司 Redirecting device to output method by hooking api
US8606950B2 (en) 2005-06-08 2013-12-10 Logitech Europe S.A. System and method for transparently processing multimedia data
CN103823683A (en) * 2014-02-27 2014-05-28 北京六间房科技有限公司 Video recording device and method
WO2014086225A1 (en) * 2012-12-06 2014-06-12 Tencent Technology (Shenzhen) Company Limited Screenshot method and device
CN106406862A (en) * 2016-08-31 2017-02-15 福建省天奕网络科技有限公司 Screen acquisition method and system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100568812C (en) 2004-08-12 2009-12-09 海信集团有限公司 Registration protection method
CN1764103B (en) 2004-10-20 2010-05-12 联想(新加坡)私人有限公司 Privacy protection method and apparatus for remote control
CN100501735C (en) 2005-06-08 2009-06-17 罗技欧洲公司 System and method for transparently processing multimedia data
US8606950B2 (en) 2005-06-08 2013-12-10 Logitech Europe S.A. System and method for transparently processing multimedia data
CN100583022C (en) 2006-09-27 2010-01-20 联想(北京)有限公司 Method for capturing computer screen image
WO2008064613A1 (en) * 2006-11-30 2008-06-05 Chongqing Yeahto Information Technology Co., Ltd. Method and apparatous for processing desktop backgrounds and interface system for os desktop
CN101436145B (en) 2007-11-15 2012-02-01 盛乐信息技术(上海)有限公司 Redirecting device to output method by hooking api
CN101984402A (en) * 2010-11-16 2011-03-09 广东威创视讯科技股份有限公司 Image acquisition and compression method and related device
WO2014086225A1 (en) * 2012-12-06 2014-06-12 Tencent Technology (Shenzhen) Company Limited Screenshot method and device
US9442897B2 (en) 2012-12-06 2016-09-13 Tencent Technology (Shenzhen) Company Limited Screenshot method and device
CN103823683A (en) * 2014-02-27 2014-05-28 北京六间房科技有限公司 Video recording device and method
CN106406862A (en) * 2016-08-31 2017-02-15 福建省天奕网络科技有限公司 Screen acquisition method and system

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