Guys:
I am now working on a application which processing .BMP files.
use the following statements I get the memory handle of the picture:
//
//do something open the bitmap
//
HGLOBAL m_hDib;
m_hDib = (HGLOBAL)::GlobalAlloc(GHND, Length);

then ,after some action, I want to delete the memory block I alloc,I use statement :
::GlobalFree((HGLOBAL)m_hDib);

I get a messagebox says that "illegal operation".I am not sure why I get this answer for all what I do is to operate on the fact points that only influence the apperance of a bitmap.

Can anybody tell me WHY?Thanks.