Re: TransparentBlt troubles...

"Mark Salsbery [MVP]" <MarkSalsbery[MVP]@newsgroup.nospam>
Fri, 9 Nov 2007 12:16:19 -0800
I would clean this up (as AliR suggested) and simplify it until it works

Try this:

BOOL TestView::OnEraseBkgnd(CDC* pDC)
return CView::OnEraseBkgnd(pDC);

void TestView::OnDraw(CDC* dc)
CBitmap foo;
BITMAP bitMapInfo;

CDC dcMem;

CBitmap *pOldBm = dcMem.SelectObject(&foo);

::TransparentBlt(*dc, 100, 120, bitMapInfo.bmWidth,
bitMapInfo.bmHeight, dcMem, 0, 0, bitMapInfo.bmWidth,
bitMapInfo.bmHeight, RGB (0, 128, 128));


"hamishd" <> wrote in message

The docs say link to Msimg32.lib ... I've personally never had to do this
explicitly in a project in Visual Studio but it mught be worth a shot.

That fixed it, but I'm still having problems. The bitmap only flashes
up for a split second (or when i'm resizing it flashes). How do I keep
it on the page?

BOOL TestView::OnEraseBkgnd(CDC* pDC)
return FALSE;//CView::OnEraseBkgnd(pDC);

void TestView::OnDraw(CDC* dc)
TestDoc* pDoc = GetDocument();

CDC dcMem;
HDC hMemDC = CreateCompatibleDC(dcMem);

CMemDC pDC(dc);

CRect rect;

int B = 10;
int W = __min(rect.Width(), rect.Height());
W = (W - 2*B)/16;

CBitmap foo;
BITMAP bitMapInfo;
TransparentBlt(dc->m_hDC, 100, 120, bitMapInfo.bmWidth,
bitMapInfo.bmHeight, dcMem.m_hDC, 0, 0, bitMapInfo.bmWidth,
bitMapInfo.bmHeight, RGB (0, 128, 128));

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