每天進步一點點

2009年10月30日星期五

Write BYTE Stream to BMP File

Write BYTE Stream to BMP File

void SaveBitmapToFile( BYTE* pBitmapBits, LONG lWidth, LONG lHeight,WORD wBitsPerPixel, LPCTSTR lpszFileName )

{

BITMAPINFOHEADER bmpInfoHeader = {0};

// Set the size

bmpInfoHeader.biSize = sizeof(BITMAPINFOHEADER);

// Bit count

bmpInfoHeader.biBitCount = wBitsPerPixel;

// Use all colors

bmpInfoHeader.biClrImportant = 0;

// Use as many colors according to bits per pixel

bmpInfoHeader.biClrUsed = 0;

// Store as un Compressed

bmpInfoHeader.biCompression = BI_RGB;

// Set the height in pixels

bmpInfoHeader.biHeight = lHeight;

// Width of the Image in pixels

bmpInfoHeader.biWidth = lWidth;

// Default number of planes

bmpInfoHeader.biPlanes = 1;

// Calculate the image size in bytes

bmpInfoHeader.biSizeImage = lWidth* lHeight * (wBitsPerPixel/8);

BITMAPFILEHEADER bfh = {0};

// This value should be values of BM letters i.e 0×4D42

// 0×4D = M 0×42 = B storing in reverse order to match with endian

// bfh.bfType=0×4D42;

//or

bfh.bfType = 'B'+('M' << 8);

// <<8 used to shift ‘M’ to end

// Offset to the RGBQUAD

bfh.bfOffBits = sizeof(BITMAPINFOHEADER) + sizeof(BITMAPFILEHEADER);

// Total size of image including size of headers

bfh.bfSize = bfh.bfOffBits + bmpInfoHeader.biSizeImage;

// Create the file in disk to write

HANDLE hFile = CreateFile( lpszFileName,GENERIC_WRITE, 0,NULL,

CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL,NULL);

if( !hFile ) // return if error opening file

{

return;

}

DWORD dwWritten = 0;

// Write the File header

WriteFile( hFile, &bfh, sizeof(bfh), &dwWritten , NULL );

// Write the bitmap info header

WriteFile( hFile, &bmpInfoHeader, sizeof(bmpInfoHeader), &dwWritten, NULL );

// Write the RGB Data

WriteFile( hFile, pBitmapBits, bmpInfoHeader.biSizeImage, &dwWritten, NULL );

// Close the file handle

CloseHandle( hFile );

}