Re: using CClientDC::BitBlt() to capture only the client window

Try this;

 *To Capture the scrren*
 CClientDC dcMemory;
 CRect rect;
 GetClientRect(&rect);
 CClientDC dc(this);
    //copy from screen dc to memory dc, so the source dc has to be the
client dc.
 dcMemory.BitBlt(0,0,rect.Width(),rect.Height(),&dc,rect.left,rect.top,SRCCOPY); //note that rect.left, and top will always be zero. And the source x and yare independent of the destination x and y. *To display the screen back* CClientDC dc(this); CRect rect; GetClientRect(&rect); dc.BitBlt(rect.left,rect.top,rect.Width(),rect.Height(),&dcMemory,0,0,SRCCOPY);If you are doing a drawing program much like paint, why are you bitbltingfrom the screen?You should be keeping a memory dc and bitmap which you do all of thedrawings on and only bitblting that to the screen!AliR."nexolite" <nexolite@discussions.microsoft.com> wrote in messagenews:B529F553-FDCB-4D9E-9805-4431EBED06C6@microsoft.com...> Hi,> I am trying to create a application similar to MS paint , so I am using> BitBlt() to capture the drawing area that is the window of my application,I> did the following:>> *To Capture the scrren*> CClientDC dcMemory;> CRect rect;> GetClientRect(&rect);>dcMemory.BitBlt(rect.TopLeft().x,rect.TopLeft().y,rect.Width(),rect.Height(),NULL,rect.TopLeft().x,rect.TopLeft().y,SRCCOPY);>> *To display the screen back*> CClientDC dc(this);> CRect rect;> GetClientRect(&rect);>dc.BitBlt(rect.TopLeft().x,rect.TopLeft().y,rect.Width(),rect.Height(),&dcMemory,rect.TopLeft().x,rect.TopLeft().y,SRCCOPY);>> Now what happens is that the complete screen, the screen including the> portion that is outside my application window gets drawn into theapplication> window ,so what must be done so that it captures the screen area of my> application window only?