User draw something like signature, there just are some black point in DC, it's easy to write to a color BMP file, but how to write it to a white and black file
Code:
bool CStaticSign::SaveToFile(CString strFile)
{
FILE * pFile;
_wfopen_s(&pFile, strFile, L"wb");
if(pFile == NULL)
{
return false;
}
BITMAPFILEHEADER bmfh;
int nBitsOffset = sizeof(BITMAPFILEHEADER) + m_BMIH.biSize;
LONG lImageSize = m_BMIH.biSizeImage;
LONG lFileSize = nBitsOffset + lImageSize;
bmfh.bfType = 'B'+('M'<<8);
bmfh.bfOffBits = nBitsOffset;
bmfh.bfSize = lFileSize;
bmfh.bfReserved1 = bmfh.bfReserved2 = 0;
//Write the bitmap file header
size_t nWrittenFileHeaderSize = fwrite(&bmfh, 1, sizeof(BITMAPFILEHEADER), pFile);
//And then the bitmap info header
size_t nWrittenInfoHeaderSize = fwrite(&m_BMIH, 1, sizeof(BITMAPINFOHEADER), pFile);
//Finally, write the image data itself -- the data represents our drawing
size_t nWrittenDIBDataSize = fwrite(m_pDrawingSurfaceBits, 1, lImageSize, pFile);
fclose(pFile);
return true;
}
Visual C++16
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