1 //VC下把HBITMAP保存为bmp图片 2 BOOL CtestBitMapDlg::SaveBmp(HBITMAP hBitmap, CString FileName) 3 { 4 HDC hDC; 5 //当前分辨率下每象素所占字节数 6 int iBits; 7 //位图中每象素所占字节数 8 WORD wBitCount; 9 //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 10 DWORD dwPaletteSize=0, dwBmBitsSize=0, dwDIBSize=0, dwWritten=0; 11 //位图属性结构 12 BITMAP Bitmap; 13 //位图文件头结构 14 BITMAPFILEHEADER bmfHdr; 15 //位图信息头结构 16 BITMAPINFOHEADER bi; 17 //指向位图信息头结构 18 LPBITMAPINFOHEADER lpbi; 19 //定义文件，分配内存句柄，调色板句柄 20 HANDLE fh, hDib, hPal,hOldPal=NULL; 21 22 int aa = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + 288 * 352 * 24 / 8; 23 24 //计算位图文件每个像素所占字节数 25 hDC = CreateDC("DISPLAY", NULL, NULL, NULL); 26 iBits = GetDeviceCaps(hDC, BITSPIXEL) * GetDeviceCaps(hDC, PLANES); 27 DeleteDC(hDC); 28 if(iBits <= 1) 29 wBitCount = 1; 30 else if(iBits <= 4) 31 wBitCount = 4; 32 else if(iBits <= 8) 33 wBitCount = 8; 34 else 35 wBitCount = 24; 36 37 GetObject(hBitmap, sizeof(Bitmap), (LPSTR)&Bitmap); 38 bi.biSize= sizeof(BITMAPINFOHEADER); 39 bi.biWidth = Bitmap.bmWidth; 40 bi.biHeight = Bitmap.bmHeight; 41 bi.biPlanes = 1; 42 bi.biBitCount = wBitCount; 43 bi.biCompression= BI_RGB; 44 bi.biSizeImage = Bitmap.bmWidth * Bitmap.bmHeight * 3; 45 bi.biXPelsPerMeter = 0; 46 bi.biYPelsPerMeter = 0; 47 bi.biClrImportant = 0; 48 bi.biClrUsed = 0; 49 50 dwBmBitsSize = ((Bitmap.bmWidth *wBitCount+31) / 32)*4* Bitmap.bmHeight; 51 52 //为位图内容分配内存 53 hDib = GlobalAlloc(GHND,dwBmBitsSize+dwPaletteSize+sizeof(BITMAPINFOHEADER)); 54 lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib); 55 *lpbi = bi; 56 57 // 处理调色板 58 hPal = GetStockObject(DEFAULT_PALETTE); 59 if (hPal) 60 { 61 hDC = ::GetDC(NULL); 62 hOldPal = ::SelectPalette(hDC,(HPALETTE)hPal, FALSE); 63 RealizePalette(hDC); 64 } 65 66 // 获取该调色板下新的像素值 67 GetDIBits(hDC,hBitmap, 0,(UINT)Bitmap.bmHeight, 68 (LPSTR)lpbi+ sizeof(BITMAPINFOHEADER)+dwPaletteSize, 69 (BITMAPINFO *)lpbi, DIB_RGB_COLORS); 70 71 //恢复调色板 72 if (hOldPal) 73 { 74 ::SelectPalette(hDC, (HPALETTE)hOldPal, TRUE); 75 RealizePalette(hDC); 76 ::ReleaseDC(NULL, hDC); 77 } 78 79 //创建位图文件 80 fh = CreateFile(FileName, GENERIC_WRITE,0, NULL, CREATE_ALWAYS, 81 FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL); 82 83 if (fh == INVALID_HANDLE_VALUE) return FALSE; 84 85 // 设置位图文件头 86 bmfHdr.bfType = 0x4D42; // "BM" 87 dwDIBSize = sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+dwPaletteSize+dwBmBitsSize; 88 bmfHdr.bfSize = dwDIBSize; 89 bmfHdr.bfReserved1 = 0; 90 bmfHdr.bfReserved2 = 0; 91 bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER)+(DWORD)sizeof(BITMAPINFOHEADER)+dwPaletteSize; 92 // 写入位图文件头 93 WriteFile(fh, (LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER), &dwWritten, NULL); 94 // 写入位图文件其余内容 95 WriteFile(fh, (LPSTR)lpbi, dwDIBSize - 14, &dwWritten, NULL); 96 //清除 97 GlobalUnlock(hDib); 98 GlobalFree(hDib); 99 CloseHandle(fh); 100 101 return TRUE; 102 }