Re: From memDC to a Bitmap..... How?
"Norbert Unterberg" <nunterberg@newsgroups.nospam> wrote in message
news:%231Gsbx4WIHA.1204@TK2MSFTNGP03.phx.gbl...
An additional note to the reader:
Even if it looks tempting, it is important to NOT use memDC here.
Although memDC is compatible with pDC, the default bitmap that GDI selects
into any memory DC is a momochrome bitmap. The call
Bmp.CreateCompatibleBitmap( &memDC, size.cx, size.cy );
would create a momochrome bitmap because GDI creates a bitmap that is
compatible to the bitmap currently selected into the DC.
Thanks for taking the time to point that out. I once spent a couple days of
frustration because I had created the compatible bitmap from the mem DC and
of course it was not right. The frustrating thing about these API's is that
they are really black boxes, and you have no understanding why tweaking
parameters have the dramatic differences they do. This epitomizes the early
days of Windows programming, where it was a vast experiment of trial and
error, stopping when it worked, but you never really understood why.
-- David