C / C++ / MFC

Saurabh.Garg wrote:

copy the value from 8-bit image to all 3 channels in the 24-bits image.

void CBMPDlg::OnShowStructData() 
{
    // Show open dialog
    CFileDialog dlg( TRUE, "bmp", 0, OFN_HIDEREADONLY | OFN_FILEMUSTEXIST, "BMP Files (*.bmp)|*.bmp|", this );
    if( IDCANCEL == dlg.DoModal())
    {
        return;
    }

    // Get the file name
    CString   csData = dlg.GetPathName();

    // Open the file
    CFile file( csData, CFile::modeRead );
    
    // Get the structural details
    csData += "\r\n\r\nStructural Data\r\n";

    // Read BITMAPFILEHEADER
    BITMAPFILEHEADER stBFH = { 0 };
    file.Read( &stBFH, sizeof( stBFH ));

    // Convert to string
    CString csStr;
    csData += "\r\nBITMAPFILEHEADER\r\n";
    csStr.Format( "bfType          - %c%c\r\n", stBFH.bfType & 0xFF, ( stBFH.bfType >> 8 ) & 0xFF );
    csData += csStr;
    csStr.Format( "bfSize          - %lu\r\n", stBFH.bfSize );
    csData += csStr;
    csStr.Format( "bfReserved1     - %u\r\n", stBFH.bfReserved1 );
    csData += csStr;
    csStr.Format( "bfReserved1     - %u\r\n", stBFH.bfReserved1 );
    csData += csStr;
    csStr.Format( "bfOffBits       - %u\r\n", stBFH.bfOffBits );
    csData += csStr;

    // Read BITMAPINFOHEADER
    BITMAPINFOHEADER stBIH = { 0 };
    file.Read( &stBIH, sizeof( stBIH ));

    // Convert to string
    csData += "\r\nBITMAPFILEHEADER\r\n";
    csStr.Format( "biSize          - %lu\r\n", stBIH.biSize );
    csData += csStr;
    csStr.Format( "biWidth         - %ld\r\n", stBIH.biWidth );
    csData += csStr;
    csStr.Format( "biHeight        - %ld\r\n", stBIH.biHeight );
    csData += csStr;
    csStr.Format( "biPlanes        - %u\r\n", stBIH.biPlanes );
    csData += csStr;
    csStr.Format( "biBitCount      - %lu\r\n", stBIH.biBitCount );
    csData += csStr;
    csStr.Format( "biCompression   - %lu\r\n", stBIH.biCompression );
    csData += csStr;
    csStr.Format( "biSizeImage     - %lu\r\n", stBIH.biSizeImage );
    csData += csStr;
    csStr.Format( "biXPelsPerMeter - %lu\r\n", stBIH.biXPelsPerMeter );
    csData += csStr;
    csStr.Format( "biYPelsPerMeter - %lu\r\n", stBIH.biYPelsPerMeter );
    csData += csStr;
    csStr.Format( "biClrUsed       - %lu\r\n", stBIH.biClrUsed );
    csData += csStr;
    csStr.Format( "biClrImportant  - %lu\r\n", stBIH.biClrImportant );
    csData += csStr;

    // RGBQUAD exists only if BitCount <= 8
    if( stBIH.biBitCount <= 8 )
    {
        // Read the RGBQUAD
        const int nSize = 1 << stBIH.biBitCount;
        RGBQUAD* arRGB = new RGBQUAD[nSize];
        file.Read( arRGB, nSize * sizeof( RGBQUAD ));

        csData += "\r\nRGBQUAD Array\r\n";
        for( int n = 0; n < nSize; n++ )
        {
            csStr.Format( "%02X %02X %02X %02X\r\n", arRGB[n].rgbBlue,arRGB[n].rgbGreen,
                                                     arRGB[n].rgbRed, arRGB[n].rgbReserved );
            csData += csStr;
        }
        delete[] arRGB;
    }
    else
    {
        csData += "\r\nRGBQUAD Array\r\nNone\r\n";
    }

    // Read the image data
    const int nSize = stBFH.bfSize - stBFH.bfOffBits;
    BYTE* arByte = new BYTE[nSize];
    file.Read( arByte, nSize );
    
    csData += "\r\nImage Data\r\n";

    for( int n = 0; n < nSize; n++ )
    {
        csStr.Format( "%02X ", arByte[n] );
        csData += csStr;
    }
    delete[] arByte;

    // Store to text box
    SetDlgItemText( IDC_EDIT_DATA, csData );
}

Dhiraj kumar Saini wrote:

b1 = (num & 0xFF0000) >> 16;
b2 = (num & 0xFF00) >> 8;
b3 = num & 0xFF;

COLORREF cr = RGB(GetBValue(num), GetGValue(num), GetRValue(num));

COLORREF cr = 0x000000ff;
COLORREF cr = RGB(255, 0, 0);

int num = _tcstol(input + 1, &pStop, 16);
b1 = (num & 0xFF0000) >> 16;
b2 = (num & 0xFF00) >> 8;
b3 = num & 0xFF;
COLORREF crBkgnd = RGB(b1 ,b2 ,b3 );

COLORREF crBkgnd = _tcstol(input + 1, &pStop, 16);