CN110096324B - Efficient screen capture method for automatically filtering self window based on windows system - Google Patents
Efficient screen capture method for automatically filtering self window based on windows system Download PDFInfo
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Abstract
The invention discloses a high-efficiency screen capture method for automatically filtering a self window based on a windows system, and belongs to the technical field of screen capture. The method comprises the following steps: creating an off-screen window in a windows system, and keeping at least one pixel point of the off-screen window in a screen; creating a control within the offscreen window; controlling the windows system to set a callback function and a current filtering window list by using the control; sending a screen capture instruction to a windows system; and acquiring a screen capture based on the callback function and performing subsequent processing on the image. According to the method and the device, the off-screen window is created in the windows system, the callback function and the current filtering window list are set in the off-screen window in advance, and then the screen capture command is sent to the windows system to capture the screen, so that the window in the current filtering window list can be automatically filtered in the screen capture process, the complexity of subsequent screen capture processing is reduced, and the screen capture efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of screen capture, and particularly relates to an efficient screen capture method for automatically filtering a window of a window based on a windows system.
Background
In windows systems, there are many methods for capturing the screen of the current desktop, and a GDI screen capture mode is more commonly used.
The GDI screen capture mode is universal, all windows versions support screen capture in the mode, other APIs are not relied on, and screen capture can be completed only by using the API in the user 32; however, the screen capture method is relatively slow, and capturing a frame 1080p of desktop takes about 5-8 ms. And image processing such as window filtering is often required after screen capture, which is time-consuming.
Disclosure of Invention
In order to solve one or more technical problems in the prior art, the invention provides a high-efficiency screen capture method for automatically filtering a self window based on a windows system, and aims to reduce subsequent processing of screen capture and improve screen capture efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-efficiency screen capture method for automatically filtering a self window based on a windows system comprises the following steps:
creating an off-screen window in a windows system, and keeping at least one pixel point of the off-screen window in a screen;
creating a control within the off-screen window;
controlling the windows system to set a callback function and a current filtering window list by using the control;
sending a screen capture instruction to a windows system;
and acquiring a screen capture based on the callback function and performing subsequent processing on the image.
Further, the method for creating the off-screen window in the windows system comprises the following steps:
registering a window class WNDCLASSEX to a windows system;
and creating the off-screen window by calling a system function createwindowEx based on the window class WNDCLASSEX.
Further, after creating the off-screen window by calling the system function CreateWindowEx, the method further includes:
and setting the style of the off-screen window and displaying the off-screen window.
Further, the method for controlling the windows system to set the callback function by using the control comprises the following steps:
and calling an API (application program interface) of the windows system by using the control, and sequentially setting a control handle value, a fixed value of 0x406 and a screenshot callback function address.
Further, the method for controlling the windows system to set the current filtered window list by using the control comprises the following steps:
and calling an API (application program interface) of the windows system by using the control, and sequentially setting a control handle value, a fixed value of 0x404, the number of windows filtered at this time and a list of window handles filtered at this time.
Further, the method for sending the screen capture instruction to the windows system comprises the following steps:
and calling an API (application program interface) of the windows system by using the control, and sequentially setting a control handle value, a fixed value of 0x400, an integer of 0 and a coordinate value of the screenshot area.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects or advantages:
the efficient screen capture method for automatically filtering the window of the window based on the windows system, provided by the invention, comprises the steps of establishing an off-screen window in the windows system, then establishing a control in the off-screen window, and then controlling the windows system to set a callback function and a current filtered window list by utilizing the control; and finally, sending a screen capture instruction to the windows system, acquiring a screen capture image based on the callback function and performing subsequent processing on the image. The invention sets the current filtering window list in advance, so that the windows in the current filtering window list are automatically filtered in the screen capturing process, the complexity of screen capturing subsequent processing is reduced, and the screen capturing efficiency is improved.
Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a flowchart of a method for automatically filtering a self window based on a windows system and performing efficient screen capture according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that the indication of the orientation or the positional relationship is based on the orientation or the positional relationship shown in the drawings, or the orientation or the positional relationship which is usually placed when the product of the present invention is used, or the orientation or the positional relationship which is usually understood by those skilled in the art, or the orientation or the positional relationship which is usually placed when the product of the present invention is used, and is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the indicated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, cannot be understood as limiting the present invention.
In the description of the embodiments of the present invention, it should be further noted that the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise; may be directly connected or indirectly connected through an intermediate. For those skilled in the art, the drawings of the embodiments with specific meanings of the terms in the present invention can be understood in specific situations, and the technical solutions in the embodiments of the present invention are clearly and completely described. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Furthermore, the terms "first" and "second" are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
The embodiment of the invention provides a high-efficiency screen capture method for automatically filtering a self window based on a windows system, which comprises the following steps as shown in figure 1:
step 1: creating an off-screen window in a windows system, and keeping at least one pixel point of the off-screen window in a screen;
and 2, step: creating a control within the off-screen window;
and step 3: controlling the windows system to set a callback function and a current filtering window list by using the control;
and 4, step 4: sending a screen capture instruction to a windows system;
and 5: and acquiring a screen capture based on the callback function and performing subsequent processing on the image.
In a specific implementation process, the method for creating an off-screen window in a windows system in step 1 in the embodiment of the present invention includes:
step 1-1: a window class WNDCLASSEX is registered with the windows system.
Specifically, an instance wcex of a window class structure WNDCLASSEX is created, an lpszclassnamname attribute of the instance wcex is set as a specified character string (the character string can be arbitrarily valued), and then a system API is called: registerClassex (& wcex), registers the window class.
Step 1-2: based on the window class WNDCLASSEX, the off-screen window is created by calling the system function CreateWindowEx.
Specifically, a window is created by calling the system function createwindoxex, and a window handle is obtained. The following method can be specifically adopted:
HWND winHwnd
＝CreateWindowEx(WS_EX_LAYERED|WS_EX_TOOLWINDOW,WindowClassName,
WindowTitle,WS_POPUP,hostWindowRect.left,hostWindowRect.top,
hostWindowRect.right,hostWindowRect.bottom,NULL,NULL,hInst,
NULL)
wherein the WindowClassName is a value designated by lpzClassName in the step 1. The hostpindowRect is a rectangular area, and the window is specified to be displayed outside the screen through coordinates of upper, lower, left and right 4 corner points of the rectangle, and at least one pixel is reserved in the screen.
It should be noted that, the above manner creation is only an example for facilitating understanding, and is not meant to be a limitation to the present invention, and those skilled in the art may use other similar manners to create the window, and the present invention is not limited thereto. Hereinafter, the examples are also given for the convenience of understanding, and are not meant to limit the present invention, and are not described herein again.
In a specific implementation process, after the creating the off-screen window by calling the system function CreateWindowEx, the method further includes:
and setting the style of the off-screen window and displaying the off-screen window. The following method can be specifically adopted:
SetLayeredWindowAttributes(winHwnd，0，255，LWA_ALPHA)。
ShowWindow(winHwnd,1)；
UpdateWindow(winHwnd)；
wherein winHwnd is the window handle.
In a specific implementation process, the purpose of creating the control in the off-screen window in step 2 according to the embodiment of the present invention is to use the control as a carrier for receiving and sending messages, so as to interact with a windows system.
After the control is created, step 3 is executed: and controlling the windows system by using the control to set a callback function and a current filtering window list.
In a specific implementation process, the method for controlling the windows system to set the callback function by using the control comprises the following steps:
and calling an API (application programming interface) of the windows system by using the control, and sequentially setting a control handle value, a fixed value of 0x406 and a screenshot callback function address. The following method can be specifically adopted:
SendMessage(controllerHwnd,0x406,0,callback)；
wherein, controllerHwnd is the created control handle, 0x406 is a fixed value used for setting the jump address of instruction execution, and Callback is the screenshot Callback function.
Wherein, the prototype of Callback is:
BOOL callback(HWND hwnd,void*imgdata,MAGIMAGEHEADER imginfo,
void*unused0,MAGIMAGEHEADER unused1,
RECT unused2,RECT unused3,HRGN unused4)
{
/*
imginfo. Cbsize = data size
Height = image height
imginfo. Width = image width
imgdata = RGBA data of image
*/
return TRUE；
}
In a specific implementation process, the method for controlling the windows system to set the current filtered window list by using the control comprises the following steps:
and calling an API (application program interface) of the windows system by using the control, and sequentially setting a control handle value, a fixed value of 0x404, the number of windows filtered at this time and a list of window handles filtered at this time. The method comprises the following specific steps:
SendMessage(controllerHwnd,0x404,winNum,winHwnd)；
wherein, controllerHwnd is the created control handle, 0x404 is a fixed value and is used for setting the window to be filtered when the screenshot is captured, winNum is the number of the windows to be filtered, and winHwnd is the window handle to be filtered.
In the above mode, the handle of the main window of the screenshot program is only required to be transmitted in as a parameter, so that any window can be set and filtered in the above mode, and the method is not limited to the self window of the screenshot program.
In a specific implementation process, in step 4 of the embodiment of the present invention, the method for sending the screen capture instruction to the windows system includes:
and calling an API (application programming interface) of the windows system by using the control, and sequentially setting a control handle value, a fixed value of 0x400, an integer of 0 and a coordinate value of a screenshot area. The method comprises the following specific steps:
SendMessage(controllerHwnd,0x400,0,rect)；
the control handle created by the controllerHwnd has the advantages that 0x400 is a fixed value, rect is a rectangular area, and the area needing to be grabbed is specified through 4 corner point coordinates.
And after the step 4 is completed, acquiring a screen capture based on the callback function, and then carrying out subsequent processing.
The efficient screen capture method for automatically filtering the self window based on the windows system, provided by the embodiment of the invention, comprises the steps of establishing an off-screen window in the windows system, then establishing a control in the off-screen window, and then controlling the windows system to set a callback function and a current filtered window list by utilizing the control; and finally, sending a screen capture instruction to the windows system, acquiring a screen capture based on the callback function and performing subsequent processing on the image. Because the current filtering window list is set in advance, the windows in the current filtering window list are automatically filtered in the screen capturing process, the complexity of the subsequent screen capturing process is reduced, and the screen capturing efficiency is improved.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (5)
1. A high-efficiency screen capture method for automatically filtering a self window based on a windows system is characterized by comprising the following steps:
creating an off-screen window in a windows system, and reserving at least one pixel point of the off-screen window in a screen;
creating a control within the off-screen window;
controlling the windows system to set a callback function and a current filtering window list by using the control;
sending a screen capture instruction to a windows system;
acquiring a screen capture based on the callback function and performing subsequent processing on the image;
the method for controlling the windows system to set the callback function by using the control comprises the following steps:
and calling an API (application programming interface) of the windows system by using the control, and sequentially setting a control handle value, a fixed value of 0x406 and a screenshot callback function address.
2. The windows-system-based efficient screen capture method for automatically filtering self-windows according to claim 1, wherein the method for creating off-screen windows in a windows system comprises:
registering a window class WNDCLASSEX to a windows system;
and creating the off-screen window by calling a system function createwindowEx based on the window class WNDCLASSEX.
3. The windows-system-based efficient screen capture method for automatically filtering self-windows according to claim 2, wherein after the creation of the off-screen window by calling a system function CreateWindowEx, the method further comprises:
and setting the style of the off-screen window and displaying the off-screen window.
4. The windows-system-based efficient screen capture method for automatically filtering self windows according to claim 1, wherein the method for controlling the windows system to set the current filtered window list by using the control comprises the following steps:
and calling an API (application program interface) of the windows system by using the control, and sequentially setting a control handle value, a fixed value of 0x404, the number of windows filtered at this time and a list of window handles filtered at this time.
5. The windows-system-based efficient screen capture method for automatically filtering self-windows according to claim 1, wherein the method for sending the screen capture instruction to the windows system is as follows:
and calling an API (application program interface) of the windows system by using the control, and sequentially setting a control handle value, a fixed value of 0x400, an integer of 0 and a coordinate value of the screenshot area.
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