Thread: Bit map viewer

I am having a problem with the BitMapViewer tutorial from: http://sunlightd.virtualave.net/Windows/GUI/

If you take a look at my screen shot, you’ll see that the bmp I load into my static group box IDC_VIEW isn’t staying within its border it runs on through to the edge of the window.

Looking at the following code I see how it finds the top and left coords but how does it know where the lower left of the view is supposed to be?

Code:

void MainDialog_OnPaint(HWND hWnd, HDC hDC)
{
	if (hBitmap == NULL)
		return;

	RECT	r;
	POINT	p;

	GetClientRect(GetDlgItem(hWnd, IDC_VIEW), &r);
	p.x = r.left;
	p.y = r.top;
	ClientToScreen(GetDlgItem(hWnd, IDC_VIEW), &p);
	ScreenToClient(hWnd, &p);

DrawState(hDC, NULL, NULL, (LPARAM)hBitmap, 0, p.x, p.y, 0, 0,   DST_BITMAP | DSS_NORMAL);
}

Here is my attachment it was lost somehow.

Wouldnt it be easier to directly blit the image using the stretchblt API call to the desired device context?

I have absolutely no Idea I am just doing the tutorial at: http://sunlightd.virtualave.net/Windows/GUI/


Then I'll mess around with other API calls. If I remember correctly the tutorial said for simplicity nothing beats: DrawState.

stretchblt will resize the image if the destination rectangle is larger/smaller than the source, unlike DrawState which will clip the image.
Which you choose to use depends on your intentions.