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take a screenshot and convert it

Posted on 2007-11-25
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Last Modified: 2010-05-18
how do I take screenshot and then process each pixel on the screenshot into

a combination of

RGB?

for instance


array[1280][1024] == 125, 150, 150
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Question by:Troudeloup
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LVL 55

Expert Comment

by:Jaime Olivares
ID: 20347421
Why do you ask the same again, just continue with the old question.
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Author Comment

by:Troudeloup
ID: 20347581
how do I import library from windows sdk ?
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LVL 55

Expert Comment

by:Jaime Olivares
ID: 20347593
that's a generic question, usually, you create a project in your compiler IDE, specifying it is a Win32 project. The compiler will include proper libraries in your project definition.
Then, in your source code you usually have to include <windows.h> header.
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Author Comment

by:Troudeloup
ID: 20347602
what if I use a generic editor?


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Author Comment

by:Troudeloup
ID: 20347606
so if I just include the line  

#include <windows.h>


mingw would know to pull from windows sdk?
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Expert Comment

by:Jaime Olivares
ID: 20347621
if it is well configured in your compiler, yes.
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Author Comment

by:Troudeloup
ID: 20347632
http://msdn2.microsoft.com/en-us/library/ms532282.aspx


I don't get this part;  can you walk me through specifc codes?
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LVL 55

Expert Comment

by:Jaime Olivares
ID: 20347646
it is hard to explain this way. you need to get a bitmap first. Have you read the article I suggested about Screen Capturing at www.codeproject.com?
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Author Comment

by:Troudeloup
ID: 20347651
COLORREF GetPixel(
  HDC hdc,    // handle to DC
  int nXPos,  // x-coordinate of pixel
  int nYPos   // y-coordinate of pixel
);


is hdc of HWND type obtained from

HWND FindWindow

what does it return?



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Author Comment

by:Troudeloup
ID: 20347655
hmmm i think i can get it if i can see all the codes.
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Author Comment

by:Troudeloup
ID: 20347705
will you post that again?
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Author Comment

by:Troudeloup
ID: 20347735
this taking it the GDI way the easiest way to do it?

http://www.codeproject.com/dialog/screencap.asp
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Accepted Solution

by:
Jaime Olivares earned 2000 total points
ID: 20347754
yes, it is the more suitable for your requirements
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Author Comment

by:Troudeloup
ID: 20347856
Void CaptureScreen()
{
    int nScreenWidth = GetSystemMetrics(SM_CXSCREEN);
    int nScreenHeight = GetSystemMetrics(SM_CYSCREEN);
    HWND hDesktopWnd = GetDesktopWindow();
    HDC hDesktopDC = GetDC(hDesktopWnd);
    HDC hCaptureDC = CreateCompatibleDC(hDesktopDC);
    HBITMAP hCaptureBitmap =CreateCompatibleBitmap(hDesktopDC,
                            nScreenWidth, nScreenHeight);
    SelectObject(hCaptureDC,hCaptureBitmap);
    BitBlt(hCaptureDC,0,0,nScreenWidth,nScreenHeight,
           hDesktopDC,0,0,SRCCOPY|CAPTUREBLT);
    SaveCapturedBitmap(hCaptureBitmap); //Place holder - Put your code
                                //here to save the captured image to disk
    ReleaseDC(hDesktopWnd,hDesktopDC);
    DeleteDC(hCaptureDC);
    DeleteObject(hCaptureBitmap);
}






this code seems to take screen shot on the whole screen - but i need to take it only on specific focused window given its handle.

1)  only the window
2) give handle to it



also, what's the name of the variable HDC that I pass to the getpixel function?

can you show me a sample code?
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LVL 39

Expert Comment

by:itsmeandnobodyelse
ID: 20350384
Troudeloup, you posted the same question again in http:Q_22981685.html.

Would you stop doing so? All who answered for the second question may hve done it for nothing as the question most likely will be deleted by a moderator.

Regards, Alex
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