Board index » cppbuilder » Re: Access Violation and TJPEG..

2003-08-10 01:09:09 PM
cppbuilder87
u using timer ??
if yes, which part of the code is in the timer ??
-Dumboo
 

Thanks Dumboo for your reply, yes I am using a timer and I am using the
whole code under the time event....
is there any problem or mistake I am making if using timer with this
code...thanks...
BTW how I can set the picture quality to 50% for example...when saving....
thanks
// All of the following code is under a timer event
HWND winHWND;
HDC winDC;
TRect Rect;
Graphics::TBitmap *FBitmap = new Graphics::TBitmap;
TJPEGImage *jp = new TJPEGImage();
winHWND = GetDesktopWindow();
winDC = GetDC(winHWND);
GetWindowRect(winHWND, &Rect);
FBitmap->Width = Rect.right - Rect.left;
FBitmap->Height = Rect.bottom - Rect.top;
BitBlt(FBitmap->Canvas->Handle, 0, 0, FBitmap->Width, FBitmap->Height,
winDC, Rect.left, Rect.top, SRCCOPY);
jp->Assign(FBitmap);
jp->Compress();
jp->SaveToFile("C:\\MySampleDir1"); ->>>>>>>it stop in this line
ReleaseDC(winHWND, winDC);
delete jp;
delete FBitmap;
"Dumboo" < XXXX@XXXXX.COM >wrote in message

your code looks alright to me, it run well no my machine
usually EOutOfMemory is thrown when an application attempts to allocate
dynamic memory, but there is not enough free memory in the system to meet
the request,
it looks as if the statement
//----------
try this alternative src code
TJPEGImage *jpg = new TJPEGImage;
Graphics::TBitmap *bmp = new Graphics::TBitmap;
HDC dc = GetDC(0);
Graphics::TCanvas *ScreenCanvas = new Graphics::TCanvas;
ScreenCanvas->Handle = dc;
bmp->Width = ScreenCanvas->Width;
bmp->Height = ScreenCanvas->Height;
ReleaseDC(NULL,dc);
jpg->Assign(bmp);
jpg->SaveToFile("myFile");
delete ScreenCanvas;
delete bmp;
delete jpg;
//----------
sorry.......cannot say anything more....8-|
Hope this helps....
-Dumboo :-)
 

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