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Article View: borland.public.cppbuilder.nativeapi
Article #14193

Screen Capture of TForm

#14193
From: CC
Date: Wed, 03 Sep 2003 22:21
36 lines
2149 bytes
Greetings all -
I'm trying to some screen snapshots. I managed to get a screen snapshot in
BITMAP form of the
desktop window. I would like to specify the window to get a snapshot of,
instead of taking the
snapshot of the entire desktop.
GetWindowDC(0) works for the desktop snapshot fine.
GetWindowDC(Handle); (where Handle is Form1->Handle); still gives me the
snapshot of the entire
desktop. I was expecting a bitmap of only the form.

What am I doing wrong?
Thanks,
CurtC

TForm::Button1Click()
{

    //hScreenDC = GetWindowDC(0);    // Get device context of desktop window
(works ok)
    hScreenDC=GetWindowDC(Handle); // Try to get device context ONLY for
TFORM
                                      // I get a device context, but the
snapshot is STILL of the
                                    // desktop.

    ScreenWidth  = GetDeviceCaps(hScreenDC, HORZRES);
    ScreenHeight = GetDeviceCaps(hScreenDC, VERTRES);
    hmemDC = CreateCompatibleDC( hScreenDC );
    hmemBM = CreateCompatibleBitmap(hScreenDC,ScreenWidth,ScreenHeight);
    SelectObject(hmemDC, hmemBM);
    BitBlt(hmemDC, 0, 0, ScreenWidth, ScreenHeight, hScreenDC, 0,
0,SRCCOPY);

    SaveBitmapToFile(.........);
}
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From: "CC" <Xcurtc@tmscorp.com>
Newsgroups: borland.public.cppbuilder.nativeapi
Subject: Screen Capture of TForm
Date: Wed, 3 Sep 2003 17:21:43 -0500
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