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Joined: 29 Oct 2011
Posts: 7
Havok 25 Nov 2011, 09:33
Hello everyone,

I hope you all had a wonderful Thanksgiving! Smile

I am having some trouble with using GDI+. Searching around the forum I found Thomasz's example of making a JPEG file (thanks so much for it) but just changing "image/jpeg" and the file extension to PNG doesn't work.

I've had no trouble doing this in C++ but here it's giving me some trouble. Here is the code I am working with:
invoke GdiplusStartup,a,b,0
invoke GdipGetImageEncodersSize,c,d
invoke VirtualAlloc,0,[d],MEM_COMMIT,PAGE_READWRITE
mov ebx,eax
invoke GdipGetImageEncoders,[c],[d],ebx
mov esi,[ebx+ImageCodecInfo.MimeType]
mov edi,e
mov ecx,11
repe cmpsw
add ebx,sizeof.ImageCodecInfo
dec [c]
lea esi,[ebx+ImageCodecInfo.Clsid]
mov edi,f
mov ecx,4
rep movsd
invoke VirtualFree,ebx,0,MEM_RELEASE
mov esi,eax
invoke GetSystemMetrics,SM_CYSCREEN
mov [g],eax
invoke GetSystemMetrics,SM_CXSCREEN
mov [h],eax
invoke CreateCompatibleBitmap,esi,[h],[g]
mov ebx,eax
invoke CreateCompatibleDC,esi
mov edi,eax
invoke SelectObject,edi,ebx
invoke BitBlt,edi,0,0,[h],[g],esi,0,0,SRCCOPY
invoke GdipCreateBitmapFromHBITMAP,ebx,0,i
invoke GdipSaveImageToFile,[i],j,f,0
invoke GdipDisposeImage,[i]
invoke GdiplusShutdown,[a]

a dd 0
b GdiplusStartupInput 1
c dd 0
d dd 0
e du 'image/png',0
f db 16 dup 0
g dd 0
h dd 0
i dd 0
j du 'test.png',0

Any help on how to use this for PNG files would be appreciated.
Post 25 Nov 2011, 09:33
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Joined: 25 Jul 2010
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typedef 25 Nov 2011, 10:30
if you can reverse engineer this screen grabber then your troubles will be over.

Post 25 Nov 2011, 10:30
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Joined: 28 Sep 2003
Posts: 11
wolf 06 Feb 2013, 16:59
change the line

'mov ecx,11' into 'mov ecx,10'

or mov ecx,strlen(e) = 10 or 11

works for bmp / jpeg / tiff / gif / png
Post 06 Feb 2013, 16:59
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