Method CreateBMPFile

ColorCop/ColorCopDlg.cpp:3237–3315

}

void CColorCopDlg::CreateBMPFile(HWND /*hwnd*/, 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) {
        AfxMessageBox(_T("GlobalAlloc failed"));
        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)) {
        AfxMessageBox(_T("GetDIBits failed"));
        return;
    }

    // Create the .BMP file.
    hf = CreateFile(pszFile,
                    GENERIC_READ | GENERIC_WRITE,
                    static_cast<DWORD>(0),
                    NULL,
                    CREATE_ALWAYS,
                    FILE_ATTRIBUTE_NORMAL,
                    (HANDLE) NULL);
    if (hf == INVALID_HANDLE_VALUE) {
        TRACE(_T("Warning: Could not create BMP file: %s (error=%lu)\n"), pszFile, GetLastError());
        return;
    }

    hdr.bfType = 0x4d42;  // 0x42 = "B" 0x4d = "M"

    // Compute the size of the entire file.
    hdr.bfSize = static_cast<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 = static_cast<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)) {
        AfxMessageBox(_T("WriteFile failed"));
        return;
    }