Re: How can I take a screen shot?

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#791

From: Jonathan Benedicto
Date: Fri, 11 Jan 2008 22:39

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Bashar Termanini wrote:
> I use this code to capture the screen
> HWND hWnd = GetDesktopWindow();
> HWND hDC  = GetWindowDC( hWnd );

First, a device context handle isn't a HWND. You should use HDC.

> Image1->Width   = Screen->Width;
> Image1->Height   = Screen->Height;
> BitBlt( Image1->Canvas->Handle, 0, 0, Screen->Width, Screen->Height, hDC, 
> 0,
> 0, SRCCOPY );
> It works first time. But when the Desktop change it still give me the 
> first
> screen shot.

Because the TImage component isn't redrawing the updated image to the 
screen.

Try this code instead:

HDC dc = GetDC( NULL );
if( dc )
{
    Image1->Width = Screen->Width;
    Image1->Height = Screen->Height;

    BitBlt( Image1->Canvas->Handle, 0, 0, Screen->Width, Screen->Height, dc, 
0, 0, SRCCOPY );
    ReleaseDC( NULL, dc );

    Image1->Repaint();
}

HTH

Jon

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Subject: Re: How can I take a screen shot?
Date: Fri, 11 Jan 2008 17:39:59 -0500
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