在C Win32中使用hBitmap = CreateDIBSection（）保存.bmp文件

我有以下代码。 我想用这个信息创建一个.bmp文件来显示内存中的数据，这是一个从framegrabber复制到主内存的图像，有人可以让我来吗？ 谢谢

LPSTR CreateBMP( HWND hAppWnd, int nImageType ) 

{
void * pWinGBits = NULL; int i; Z_BITMAPINFO zWinGHeader; //用于终止DIB的bitmapinfo

 // create DC for bitmap. hDCBits = CreateCompatibleDC( ghDCMain ); switch ( nImageType ) { case bayer_filter: zWinGHeader.bmiHeader.biSize = sizeof( BITMAPINFOHEADER ); zWinGHeader.bmiHeader.biPlanes = 1; zWinGHeader.bmiHeader.biClrImportant = 0; zWinGHeader.bmiHeader.biHeight = -lYSize; zWinGHeader.bmiHeader.biWidth = lXSize; zWinGHeader.bmiHeader.biBitCount = 32; zWinGHeader.bmiHeader.biClrUsed = 0;//3; zWinGHeader.bmiHeader.biCompression = BI_BITFIELDS; zWinGHeader.bmiHeader.biSizeImage = 0; zWinGHeader.bmiColors[0].rgbBlue = 0x00; zWinGHeader.bmiColors[0].rgbGreen = 0x00; zWinGHeader.bmiColors[0].rgbRed = 0xFF; zWinGHeader.bmiColors[0].rgbReserved = 0x00; zWinGHeader.bmiColors[1].rgbBlue = 0x00; zWinGHeader.bmiColors[1].rgbGreen = 0xFF; zWinGHeader.bmiColors[1].rgbRed = 0x00; zWinGHeader.bmiColors[1].rgbReserved = 0x00; zWinGHeader.bmiColors[2].rgbBlue = 0xFF; zWinGHeader.bmiColors[2].rgbGreen = 0x00; zWinGHeader.bmiColors[2].rgbRed = 0x00; zWinGHeader.bmiColors[2].rgbReserved = 0x00; break; case color32: zWinGHeader.bmiHeader.biSize = sizeof( BITMAPINFOHEADER ); zWinGHeader.bmiHeader.biPlanes = 1; zWinGHeader.bmiHeader.biClrImportant = 0; zWinGHeader.bmiHeader.biHeight = -lYSize; zWinGHeader.bmiHeader.biWidth = lXSize/4; zWinGHeader.bmiHeader.biBitCount = 32; zWinGHeader.bmiHeader.biClrUsed = 0; zWinGHeader.bmiHeader.biCompression = BI_BITFIELDS; zWinGHeader.bmiHeader.biSizeImage = 0; zWinGHeader.bmiColors[0].rgbBlue = 0x00; zWinGHeader.bmiColors[0].rgbGreen = 0x00; zWinGHeader.bmiColors[0].rgbRed = 0xFF; zWinGHeader.bmiColors[0].rgbReserved = 0x00; zWinGHeader.bmiColors[1].rgbBlue = 0x00; zWinGHeader.bmiColors[1].rgbGreen = 0xFF; zWinGHeader.bmiColors[1].rgbRed = 0x00; zWinGHeader.bmiColors[1].rgbReserved = 0x00; zWinGHeader.bmiColors[2].rgbBlue = 0xFF; zWinGHeader.bmiColors[2].rgbGreen = 0x00; zWinGHeader.bmiColors[2].rgbRed = 0x00; zWinGHeader.bmiColors[2].rgbReserved = 0x00; break; case color24: zWinGHeader.bmiHeader.biSize = sizeof( BITMAPINFOHEADER ); zWinGHeader.bmiHeader.biPlanes = 1; zWinGHeader.bmiHeader.biClrImportant = 0; zWinGHeader.bmiHeader.biHeight = -lYSize; zWinGHeader.bmiHeader.biWidth = lXSize/3; zWinGHeader.bmiHeader.biBitCount = 24; zWinGHeader.bmiHeader.biClrUsed = 0; zWinGHeader.bmiHeader.biCompression = BI_RGB; zWinGHeader.bmiHeader.biSizeImage = 0; break; case color3x16: zWinGHeader.bmiHeader.biSize = sizeof( BITMAPINFOHEADER ); zWinGHeader.bmiHeader.biPlanes = 1; zWinGHeader.bmiHeader.biClrImportant = 0; zWinGHeader.bmiHeader.biHeight = -lYSize; zWinGHeader.bmiHeader.biWidth = lXSize/6; zWinGHeader.bmiHeader.biBitCount = 32; zWinGHeader.bmiHeader.biClrUsed = 0; zWinGHeader.bmiHeader.biCompression = BI_BITFIELDS; zWinGHeader.bmiHeader.biSizeImage = 0; zWinGHeader.bmiColors[0].rgbBlue = 0x00; zWinGHeader.bmiColors[0].rgbGreen = 0x00; zWinGHeader.bmiColors[0].rgbRed = 0xFF; zWinGHeader.bmiColors[0].rgbReserved = 0x00; zWinGHeader.bmiColors[1].rgbBlue = 0x00; zWinGHeader.bmiColors[1].rgbGreen = 0xFF; zWinGHeader.bmiColors[1].rgbRed = 0x00; zWinGHeader.bmiColors[1].rgbReserved = 0x00; zWinGHeader.bmiColors[2].rgbBlue = 0xFF; zWinGHeader.bmiColors[2].rgbGreen = 0x00; zWinGHeader.bmiColors[2].rgbRed = 0x00; zWinGHeader.bmiColors[2].rgbReserved = 0x00; break; case bw1x10: // create bitmap-infoheader. zWinGHeader.bmiHeader.biSize = sizeof( BITMAPINFOHEADER ); zWinGHeader.bmiHeader.biPlanes = 1; zWinGHeader.bmiHeader.biBitCount = 8; zWinGHeader.bmiHeader.biCompression = BI_RGB; zWinGHeader.bmiHeader.biSizeImage = 0; zWinGHeader.bmiHeader.biClrUsed = 256; zWinGHeader.bmiHeader.biClrImportant= 0; zWinGHeader.bmiHeader.biHeight = -lYSize; zWinGHeader.bmiHeader.biWidth = lXSize/2; // create colortable fot bitmap (grayvalues). for (i = 0; i < 256; i++) { zWinGHeader.bmiColors[i].rgbGreen = i; zWinGHeader.bmiColors[i].rgbBlue = i; zWinGHeader.bmiColors[i].rgbRed = i; zWinGHeader.bmiColors[i].rgbReserved = 0; } break; default: case bw8: // create bitmap-infoheader. zWinGHeader.bmiHeader.biSize = sizeof( BITMAPINFOHEADER ); zWinGHeader.bmiHeader.biPlanes = 1; zWinGHeader.bmiHeader.biBitCount = 8; zWinGHeader.bmiHeader.biCompression = BI_RGB; zWinGHeader.bmiHeader.biSizeImage = 0; zWinGHeader.bmiHeader.biClrUsed = 256; zWinGHeader.bmiHeader.biClrImportant= 0; zWinGHeader.bmiHeader.biHeight = -lYSize; zWinGHeader.bmiHeader.biWidth = lXSize; // create colortable fot bitmap (grayvalues). for (i = 0; i < 256; i++) { zWinGHeader.bmiColors[i].rgbGreen = i; zWinGHeader.bmiColors[i].rgbBlue = i; zWinGHeader.bmiColors[i].rgbRed = i; zWinGHeader.bmiColors[i].rgbReserved = 0; } break; } // cerate identity palette hPal = CreateIdentityPalette( zWinGHeader.bmiColors ); // get new palette into DC and map into physical palette register. hOldPal = SelectPalette( ghDCMain, hPal, FALSE); RealizePalette( ghDCMain ); // cerate DIB-Section f黵 direct access of image-data. hBitmap = CreateDIBSection( hDCBits, // handle of device context (BITMAPINFO *)&zWinGHeader, // address of structure containing // bitmap size, format and color data DIB_RGB_COLORS, // color data type indicator: RGB values // or palette indices &pWinGBits, // pointer to variable to receive a pointer // to the bitmap's bit values NULL, // optional handle to a file mapping object 0 // offset to the bitmap bit values within // the file mapping object ); // get bitmap into DC . hOldBitmap = (HBITMAP)SelectObject( hDCBits, hBitmap ); return pWinGBits; // return pointer to DIB 

}

Answer 1

使用win32 api从内存中的图像数据或HBITMAP到图像文件的最简单方法是使用GDI +。 只需从您的图像数据或HBITMAP创建一个Bitmap对象（请参阅http://msdn.microsoft.com/en-us/library/ms536314%28v=vs.85%29.aspx ），然后使用Save方法创建文件（请参阅http://sofzh.miximages.com/c/ Convert the color format to a count of bits. cClrBits = (WORD)(bmp.bmPlanes * bmp.bmBitsPixel); if (cClrBits == 1) cClrBits = 1; else if (cClrBits <= 4) cClrBits = 4; else if (cClrBits <= 8) cClrBits = 8; else if (cClrBits <= 16) cClrBits = 16; else if (cClrBits <= 24) cClrBits = 24; else cClrBits = 32; // Allocate memory for the BITMAPINFO structure. (This structure // contains a BITMAPINFOHEADER structure and an array of RGBQUAD // data structures.) if (cClrBits != 24) pbmi = (PBITMAPINFO) LocalAlloc(LPTR, sizeof(BITMAPINFOHEADER) + sizeof(RGBQUAD) * (1<< cClrBits)); // There is no RGBQUAD array for the 24-bit-per-pixel format. else pbmi = (PBITMAPINFO) LocalAlloc(LPTR, sizeof(BITMAPINFOHEADER)); // Initialize the fields in the BITMAPINFO structure. pbmi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER); pbmi->bmiHeader.biWidth = bmp.bmWidth; pbmi->bmiHeader.biHeight = bmp.bmHeight; pbmi->bmiHeader.biPlanes = bmp.bmPlanes; pbmi->bmiHeader.biBitCount = bmp.bmBitsPixel; if (cClrBits < 24) pbmi->bmiHeader.biClrUsed = (1<bmiHeader.biCompression = BI_RGB; // Compute the number of bytes in the array of color // indices and store the result in biSizeImage. // For Windows NT, the width must be DWORD aligned unless // the bitmap is RLE compressed. This example shows this. // For Windows 95/98/Me, the width must be WORD aligned unless the // bitmap is RLE compressed. pbmi->bmiHeader.biSizeImage = ((pbmi->bmiHeader.biWidth * cClrBits +31) & ~31) /8 * pbmi->bmiHeader.biHeight; // Set biClrImportant to 0, indicating that all of the // device colors are important. pbmi->bmiHeader.biClrImportant = 0; return pbmi; } void CreateBMPFile(LPTSTR pszFile, PBITMAPINFO pbi, HBITMAP hBMP, HDC hDC) { HANDLE hf; // file handle BITMAPFILEHEADER hdr; // bitmap file-header PBITMAPINFOHEADER pbih; // bitmap info-header LPBYTE lpBits; // memory pointer DWORD dwTotal; // total count of bytes DWORD cb; // incremental count of bytes BYTE *hp; // byte pointer DWORD dwTmp; pbih = (PBITMAPINFOHEADER) pbi; lpBits = (LPBYTE) GlobalAlloc(GMEM_FIXED, pbih->biSizeImage); if (!lpBits) return; // Retrieve the color table (RGBQUAD array) and the bits // (array of palette indices) from the DIB. if (!GetDIBits(hDC, hBMP, 0, (WORD) pbih->biHeight, lpBits, pbi, DIB_RGB_COLORS)) { return; } // Create the .BMP file. hf = CreateFile(pszFile, GENERIC_READ | GENERIC_WRITE, (DWORD) 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, (HANDLE) NULL); if (hf == INVALID_HANDLE_VALUE) return; hdr.bfType = 0x4d42; // 0x42 = “B” 0x4d = “M” // Compute the size of the entire file. hdr.bfSize = (DWORD) (sizeof(BITMAPFILEHEADER) + pbih->biSize + pbih->biClrUsed * sizeof(RGBQUAD) + pbih->biSizeImage); hdr.bfReserved1 = 0; hdr.bfReserved2 = 0; // Compute the offset to the array of color indices. hdr.bfOffBits = (DWORD) sizeof(BITMAPFILEHEADER) + pbih->biSize + pbih->biClrUsed * sizeof (RGBQUAD); // Copy the BITMAPFILEHEADER into the .BMP file. if (!WriteFile(hf, (LPVOID) &hdr, sizeof(BITMAPFILEHEADER), (LPDWORD) &dwTmp, NULL)) { return; } // Copy the BITMAPINFOHEADER and RGBQUAD array into the file. if (!WriteFile(hf, (LPVOID) pbih, sizeof(BITMAPINFOHEADER) + pbih->biClrUsed * sizeof (RGBQUAD), (LPDWORD) &dwTmp, ( NULL))) return; // Copy the array of color indices into the .BMP file. dwTotal = cb = pbih->biSizeImage; hp = lpBits; if (!WriteFile(hf, (LPSTR) hp, (int) cb, (LPDWORD) &dwTmp,NULL)) return; // Close the .BMP file. if (!CloseHandle(hf)) return; // Free memory. GlobalFree((HGLOBAL)lpBits); } //code for saving bitmap HBITMAP hBitmap; HDC hdc; … PBITMAPINFO pBitmapInfo = CreateBitmapInfoStruct(hBitmap); CreateBMPFile(_T(“c:\\temp\\picture.bmp”), pBitmapInfo, hBitmap, hdc);

如果你被允许使用C ++，你可以使用ATL CImage更容易（几行）。

Answer 2

CreateDIBSection函数创建一个应用程序可以直接写入的DIB *。 该函数为您提供指向位图位值的位置的指针。

此调用不会创建位图图像，为什么要使用该函数？

• 设备无关位图