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Index > Windows > Why CreateDIBSection() returns NULL?

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programmer



Joined: 05 Jun 2006
Posts: 6
programmer
I can't get it work.

Code:
--- data section ---
infoheader BITMAPINFOHEADER 40,581,381,1,24,BI_RGB,0,0,0,0,0
bminfo BITMAPINFO
winDC dd ?
memDC dd ?
hbitmap dd ?
bmsize dd ?
bmbits dd ?
...

--- code section ---
... some code ...

invoke GetWindowDC,[hMain] ; hMain is a handle to main window
mov [winDC],eax

invoke CreateCompatibleDC,[winDC]
mov [memDC],eax

mov eax,[infoheader]
mov [bminfo.bmiHeader],eax

invoke CreateDIBSection,[memDC],bminfo,0,bmbits,0,0
mov [hbitmap],eax

... more code ...
...
    
Why [hbitmap] is NULL?
Post 19 Jun 2006, 11:38
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Lion17



Joined: 30 May 2006
Posts: 5
Lion17
replace code
Code:
infoheader BITMAPINFOHEADER 40,581,381,1,24,BI_RGB,0,0,0,0,0 
bminfo BITMAPINFO    

with
Code:
bminfo:
infoheader BITMAPINFOHEADER 40,581,381,1,24,BI_RGB,0,0,0,0,0 
    

delete code
Code:
mov eax,[infoheader] 
mov [bminfo.bmiHeader],eax    
Post 19 Jun 2006, 11:46
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programmer



Joined: 05 Jun 2006
Posts: 6
programmer
Thanks!
I'm trying to save bitmap from DC to file, but it doesn't work anyway. Please help me.
Code:
fileheader BITMAPFILEHEADER 0x4D42,0,0,0,54
bminfo:
infoheader BITMAPINFOHEADER 40,581,381,1,24,BI_RGB,0,0,0,0,0
;bminfo BITMAPINFO
nobw dd ?
winDC dd ?
memDC dd ?
hbitmap dd ?
bmsize dd ?
hfile dd ?
                
bmbits dd ?
        
        proc SaveBitmapToFile
                
                ;mov eax,[infoheader]
                ;mov [bminfo.bmiHeader],eax
                
                invoke GetWindowDC,[hPicDisp]
                mov [winDC],eax
                
                invoke CreateCompatibleDC,[winDC]
                mov [memDC],eax
                
                invoke CreateDIBSection,[winDC],bminfo,0,bmbits,0,0
                mov [hbitmap],eax
                
                invoke SelectObject,[memDC],[hbitmap]
                
                invoke BitBlt,[memDC],0,0,581,381,[winDC],0,0,SRCCOPY
                
                invoke DeleteDC,[memDC]
                
                invoke ReleaseDC,[hPicDisp],[winDC]
                
                invoke CreateFile,'C:\screen.bmp',GENERIC_READ + GENERIC_WRITE,0,0,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,0
                mov [hfile],eax
                
                invoke WriteFile,[hfile],fileheader,14,nobw,0
                invoke WriteFile,[hfile],infoheader,40,nobw,0
                
                ;((biWidth * (biBitCount / 8) + 3) And &HFFFFFFFC) * biHeight
                mov eax,24
                ;mov ebx,8
                ;div ebx
                shr eax,3
                mov ebx,[infoheader.biWidth]
                mul ebx
                add eax,3
                and eax,0xFFFFFFFC
                mov ebx,[infoheader.biHeight]
                mul ebx
                
                
                invoke WriteFile,[hfile],bmbits,eax,nobw,0
                
                invoke CloseHandle,[hfile]
                
                invoke DeleteObject,[hbitmap]
                
                ret
        endp
    
Post 19 Jun 2006, 11:59
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