Re: StretchBlt issue
"Sri" <srinivasan222@gmail.com> wrote in message
news:1147257740.443128.19860@e56g2000cwe.googlegroups.com...
Hi,
In a pocket Pc application, I am trying to capture the screen image and
zoom it. I tried using StretchBlt. But it captures the image but not
stretching it.
Please find the code below...
RECT rc;
GetClientRect(&rc);
int w,h;
w=rc.right;
h=rc.bottom;
rc.right=GetSystemMetrics(SM_CXSCREEN);
rc.bottom=GetSystemMetrics(SM_CYSCREEN);
CDC bufdc;
bufdc.CreateCompatibleDC(pDC);
CBitmap hbm;
hbm.CreateCompatibleBitmap(pDC,2*w,2*h);
SelectObject(bufdc,hbm);
SetStretchBltMode(bufdc,COLORONCOLOR);
StretchBlt(bufdc,0,0,2*w,2*h,
(HDC)pDC,rc.left,rc.top,rc.right-rc.left,rc.bottom-rc.top,SRCCOPY); //
A quick guess is that the (HDC)pDC cast isn't legit. There's: GetSafeHdc,
(HDC)*pDC or just *pDC, but why not just use bufdc.StretchBlt and avoid the
issue all together?
DeleteDC(bufdc);
This doesn't seem necessary, but you probably should arrange to SelectObject
hbm back out before the dtor executes.
--
Jeff Partch [VC++ MVP]
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