Question

Select an screen area

Asked by: CSecurity

Hi

I want to create simple capture screen tool, I want to let user to draw a rectangle on screen and I'll capture image of that part of screen.

Any sample codes for this problem?
Thanks from now

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Asked On
2009-11-04 at 02:12:25ID24870336
Topics

C++ Programming Language

,

C Programming Language

,

Microsoft Visual C++.Net

Participating Experts
2
Points
500
Comments
8

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Answers

 

by: jaime_olivaresPosted on 2009-11-04 at 03:37:08ID: 25738281

 

by: CSecurityPosted on 2009-11-04 at 03:59:49ID: 25738422

Thanks Jaime... I know how to capture an image from screen.

I want ability to let user draw a shape, a rectangle on screen... So I can capture only that area of screen....

Any ideas?

 

by: pgnatyukPosted on 2009-11-04 at 14:10:45ID: 25744560

SnagIt - this app can you give an idea how your application may look like.
http://www.softwarecasa.com/snagit.html?gclid=CIG7u6uq8p0CFSZdagodzyV1xg

Here is an example: http://www.codeproject.com/KB/cs/TeboScreen.aspx

Here is an another example in C-style that promises to do exactly what you are asking in your last comment:

http://www.programmersheaven.com/mb/windows/104684/104684/drawing-a-selection-box-on-screen-with-the-mouse---example-code/

Actually, HDC hDC = GetDC(NULL) gives you the DC of the desktop and you can draw on it. You can try. I just don't know how you will delete the painting. :)

GetDesktopWindow gives the desktop window handle. It is a parent window for all other windows. You need to draw over all these windows.

I cannot say that to draw on the desktop is a very nice thing to do. Also you will need to control the cursor - position and movement and, probably the keyboard. So you may need a hook.

Another idea can be to copy the current state of the desktop into your application. Then, in your application it will be very easy for you to select an area and make a file from it.

 

by: CSecurityPosted on 2009-11-07 at 10:54:10ID: 25767545

I can't open programmersheaven website, seems it's down... Can you show me code for drawing rectangle on screen?

 

by: pgnatyukPosted on 2009-11-07 at 17:36:19ID: 25768986

Gray rectangle on the desktop. Any window coming to this area clears the desktop.

#define WIN32_LEAN_AND_MEAN
 
#include <windows.h>
 
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, 
				   LPSTR lpCmdLine, int nShowCmd)
{
	HDC hDC = GetDC(NULL);
	HBRUSH hBrush = (HBRUSH)GetStockObject(GRAY_BRUSH);
	RECT rect = { 100, 100, 400, 400 };
	FillRect(hDC, &rect, hBrush);
	ReleaseDC(NULL, hDC);
	return 0;
}

                                              
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by: pgnatyukPosted on 2009-11-07 at 17:40:01ID: 25768999

this article contains all you are asking http://www.codeproject.com/KB/cs/TeboScreen.aspx

It is in C# and you need to translate the logic to C++.

 

by: pgnatyukPosted on 2009-11-07 at 17:58:04ID: 25769052

Screen Capture (Simple Win32 Dialog Based) - C++,  uses mouse hook, source code and a demo app.

 

by: CSecurityPosted on 2009-11-08 at 02:11:38ID: 31649899

Thanks

20120131-EE-VQP-002

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