Re: bitmap from clipboard to file

Hi,
Here's my (error handling stripped) file save method which I remember testing on various, but not all types of bitmap at the time, maybe you can see something in this that might help?

Jonathan

	BITMAPINFO  *pInfo;
	UINT8       *pImage;
	HANDLE      hFile;
	DWORD       i,LineSize,Offs;
	BITMAPFILEHEADER fh;
	BITMAPINFOHEADER bmi;

	// Get image information from our connected view
	pImage=GetImage();
	pInfo=GetBitmapInfo();

	
	hFile = CreateFile(lpszFilename, GENERIC_READ | GENERIC_WRITE, (DWORD)0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
	
	// Copy Bitmapinfoheader (set Width and Height absolute)
	bmi=pInfo->bmiHeader;
	bmi.biWidth=abs(pInfo->bmiHeader.biWidth);
	bmi.biHeight=abs(pInfo->bmiHeader.biHeight);

	// Build fileheader and write
	fh.bfType=BMTYPE;
	BITMAPFILEHEADER bmFileHeader;
	bmFileHeader.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER) + bmi.biSize + bmi.biClrUsed * sizeof(RGBQUAD) + bmi.biSizeImage; 

	if(pInfo->bmiHeader.biBitCount==8)
	{
		fh.bfOffBits=sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+
				 256*sizeof(RGBQUAD);
		fh.bfSize=fh.bfOffBits+pInfo->bmiHeader.biSizeImage;
		bmi.biClrUsed=256;
		bmi.biClrImportant=0;
	}
	else
	{
		fh.bfOffBits=sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER);
		fh.bfSize   =fh.bfOffBits+pInfo->bmiHeader.biSizeImage;
		bmi.biClrUsed=0;
		bmi.biClrImportant=0;
	}

	fh.bfReserved1=0;
	fh.bfReserved2=0;

	// Write fileheader
	DWORD dwBytesWritten = 0;
	DWORD dwErr = 0;
	WriteFile(hFile, (LPVOID)&fh,sizeof(BITMAPFILEHEADER), &dwBytesWritten, NULL);

	// Write bitmapinfoheader
	WriteFile(hFile, (char*)&bmi,sizeof(BITMAPINFOHEADER), &dwBytesWritten, NULL);

	// Write Palette (only if grayscale)
	if(bmi.biClrUsed!=0)
	{
		WriteFile(hFile, (char*)pInfo->bmiColors,pInfo->bmiHeader.biClrUsed*sizeof(RGBQUAD), &dwBytesWritten, NULL);
		
	}

	// Write all lines (from bottom up)
	LineSize=bmi.biWidth*bmi.biBitCount/8;
	Offs=LineSize*(bmi.biHeight-1);
	for(i=0;i<(UINT32)bmi.biHeight;i++)
	{
		WriteFile(hFile, (char*)&pImage[Offs],LineSize, &dwBytesWritten, NULL);
		Offs-=LineSize;
	}

	CloseHandle(hFile);



--- In [email protected], "umeca74" <umeca74@...> wrote:
>
> Hi
> 
> I've been trying to save a window snapshot (32-bit) to a BMP file, but the saved image is slightly distorted, it looks like the picture is shifted to the right by a few pixels, like this:
> http://img97.imageshack.us/img97/5189/clipboard01e.png
> 
> here is the code i use (stripped from error checks). It must be something silly I do but after 2 days I can't see what!?
> 
> --------------------------------
> LPDATAOBJECT pDataObject;
> OleGetClipboard(&pDataObject);
> 
> FORMATETC fmt = {CF_DIB, NULL, DVASPECT_CONTENT, -1, TYMED_HGLOBAL};
> STGMEDIUM stgm;
> pDataObject->GetData(&fmt, &stgm);
> file = root + _T("x2scrap.bmp");
> HANDLE hOut = CreateFile(file, GENERIC_WRITE, 0, NULL,
> CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
> 
> LPBITMAPINFOHEADER hDIB = (LPBITMAPINFOHEADER)GlobalLock(stgm.hGlobal);
> BITMAPFILEHEADER bmh; 
> DWORD sizebm = GlobalSize(stgm.hGlobal); // includes palettes 
> bmh.bfType = MAKEWORD('B', 'M');
> bmh.bfReserved1 = 0; 
> bmh.bfReserved2 = 0; 
> bmh.bfOffBits = sizeof(bmh) + hDIB->biSize; 
> 
> if(hDIB->biBitCount <= 8) { // palette exists
> DWORD tmp = hDIB->biClrUsed;
> if(!tmp)
> tmp = 1 << hDIB->biBitCount;
> 
> bmh.bfOffBits += tmp*sizeof(RGBQUAD);
> }
> 
> bmh.bfSize = sizebm + sizeof(bmh); 
> 
> DWORD ioAmount;
> WriteFile(hOut,&bmh,sizeof(bmh),&ioAmount,NULL);
> WriteFile(hOut,hDIB,sizebm,&ioAmount,NULL);
> 
> GlobalUnlock(stgm.hGlobal);
> CloseHandle(hOut);
> ReleaseStgMedium(&stgm);
> pDataObject->Release();
> --------------------------------
> 
> any help appreciated
> thanks
> nikos
>




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