hankgao0703
Programmer
Doese anybody know what exactly the reason can cause CreateDIBSection fails.
I call CreateDIBSection, but it fails occassionaly.
Thanks.
I call CreateDIBSection, but it fails occassionaly.
Thanks.
Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations wOOdy-Soft on being selected by the Tek-Tips community for having the most helpful posts in the forums last week. Way to Go!
CreateDIBSection problem
- Thread starter hankgao0703
- Start date
- Status
There are a lot of reasons.
For example:
1. Bad handle to device context
2. Bad BITMAPINFO (members) : bmiHeader or color info (You can have 3-4 errors here only)
3. Wrong color data type indicator
4. Null pointer to variable to receive a pointer to the bitmap's bit values
5. Wrong handle to a file mapping object or offset to the bitmap bit values (if the handle is not NULL).
And: if You use multithreading, all can be wrong, what should be right.
You should use it so:
BITMAPINFO *pDIB - Pointer to right BITMAPINFO!
LPBYTE lpBits;
HDC hDC = GetDC( NULL ); //Desktop DC, if You do not know, wich HWND You should use
HBITMAP hBitmap = CreateDIBSection( hDC, pDIB, DIB_RGB_COLORS, (void**)&lpBits, NULL, 0 );
......
ReleaseDC( NULL, hDC ); //Do not forget!
For example:
1. Bad handle to device context
2. Bad BITMAPINFO (members) : bmiHeader or color info (You can have 3-4 errors here only)
3. Wrong color data type indicator
4. Null pointer to variable to receive a pointer to the bitmap's bit values
5. Wrong handle to a file mapping object or offset to the bitmap bit values (if the handle is not NULL).
And: if You use multithreading, all can be wrong, what should be right.
You should use it so:
BITMAPINFO *pDIB - Pointer to right BITMAPINFO!
LPBYTE lpBits;
HDC hDC = GetDC( NULL ); //Desktop DC, if You do not know, wich HWND You should use
HBITMAP hBitmap = CreateDIBSection( hDC, pDIB, DIB_RGB_COLORS, (void**)&lpBits, NULL, 0 );
......
ReleaseDC( NULL, hDC ); //Do not forget!
- Status