C++将HBITMAP保存为bmp图片

野性酷女 2022-08-14 05:34 175阅读 0赞

BOOL CBMP2ArrayMultiplyDlg::SaveBitmapToFile(HBITMAP   hBitmap, CString szfilename)
    {
    	HDC     hDC;         
    	//当前分辨率下每象素所占字节数          
    	int     iBits;         
    	//位图中每象素所占字节数          
    	WORD     wBitCount;         
    	//定义调色板大小，     位图中像素字节大小     ，位图文件大小     ，     写入文件字节数              
    	DWORD     dwPaletteSize=0,   dwBmBitsSize=0,   dwDIBSize=0,   dwWritten=0;             
    	//位图属性结构              
    	BITMAP     Bitmap;                 
    	//位图文件头结构          
    	BITMAPFILEHEADER     bmfHdr;                 
    	//位图信息头结构              
    	BITMAPINFOHEADER     bi;                 
    	//指向位图信息头结构                  
    	LPBITMAPINFOHEADER     lpbi;                 
    	//定义文件，分配内存句柄，调色板句柄              
    	HANDLE     fh,   hDib,   hPal,hOldPal=NULL;             
    
    	//计算位图文件每个像素所占字节数              
    	hDC  = CreateDC("DISPLAY",   NULL,   NULL,   NULL);         
    	iBits  = GetDeviceCaps(hDC,   BITSPIXEL)     *     GetDeviceCaps(hDC,   PLANES);             
    	DeleteDC(hDC);             
    	if(iBits <=  1)                                                   
    		wBitCount = 1;             
    	else  if(iBits <=  4)                               
    		wBitCount  = 4;             
    	else if(iBits <=  8)                               
    		wBitCount  = 8;             
    	else                                                                                                                               
    		wBitCount  = 24;
    
    	GetObject(hBitmap,   sizeof(Bitmap),   (LPSTR)&Bitmap);         
    	bi.biSize= sizeof(BITMAPINFOHEADER);         
    	bi.biWidth = Bitmap.bmWidth;         
    	bi.biHeight =  Bitmap.bmHeight;         
    	bi.biPlanes =  1;         
    	bi.biBitCount = wBitCount;         
    	bi.biCompression= BI_RGB;         
    	bi.biSizeImage=0;         
    	bi.biXPelsPerMeter = 0;         
    	bi.biYPelsPerMeter = 0;         
    	bi.biClrImportant = 0;         
    	bi.biClrUsed =  0;         
    
    	dwBmBitsSize  = ((Bitmap.bmWidth *wBitCount+31) / 32)*4* Bitmap.bmHeight;         
    
    	//为位图内容分配内存              
    	hDib  = GlobalAlloc(GHND,dwBmBitsSize+dwPaletteSize+sizeof(BITMAPINFOHEADER));             
    	lpbi  = (LPBITMAPINFOHEADER)GlobalLock(hDib);             
    	*lpbi  = bi;             
    
    	//     处理调色板                  
    	hPal  = GetStockObject(DEFAULT_PALETTE);             
    	if (hPal)             
    	{             
    		hDC  = ::GetDC(NULL);             
    		hOldPal = ::SelectPalette(hDC,(HPALETTE)hPal, FALSE);             
    		RealizePalette(hDC);             
    	}         
    
    	//     获取该调色板下新的像素值              
    	GetDIBits(hDC,hBitmap, 0,(UINT)Bitmap.bmHeight,  
    		(LPSTR)lpbi+ sizeof(BITMAPINFOHEADER)+dwPaletteSize,   
    		(BITMAPINFO *)lpbi, DIB_RGB_COLORS);             
    
    	//恢复调色板                  
    	if (hOldPal)             
    	{             
    		::SelectPalette(hDC,   (HPALETTE)hOldPal,   TRUE);             
    		RealizePalette(hDC);             
    		::ReleaseDC(NULL,   hDC);             
    	}             
    
    	//创建位图文件                  
    	fh  = CreateFile(szfilename,   GENERIC_WRITE,0,   NULL,   CREATE_ALWAYS,           
    		FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN,   NULL);             
    
    	if (fh     ==  INVALID_HANDLE_VALUE)         return     FALSE;             
    
    	//     设置位图文件头              
    	bmfHdr.bfType  = 0x4D42;     //     "BM"              
    	dwDIBSize  = sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+dwPaletteSize+dwBmBitsSize;                 
    	bmfHdr.bfSize  = dwDIBSize;             
    	bmfHdr.bfReserved1  = 0;             
    	bmfHdr.bfReserved2  = 0;             
    	bmfHdr.bfOffBits  = (DWORD)sizeof(BITMAPFILEHEADER)+(DWORD)sizeof(BITMAPINFOHEADER)+dwPaletteSize;             
    	//     写入位图文件头              
    	WriteFile(fh,   (LPSTR)&bmfHdr,   sizeof(BITMAPFILEHEADER),   &dwWritten,   NULL);             
    	//     写入位图文件其余内容              
    	WriteFile(fh,   (LPSTR)lpbi,   dwDIBSize,   &dwWritten,   NULL);             
    	//清除                  
    	GlobalUnlock(hDib);             
    	GlobalFree(hDib);             
    	CloseHandle(fh);             
    
    	return     TRUE;         
    
    }