How to load FIBITMAP and convert it to HBITMAP

最新推荐文章于 2024-11-11 10:14:11 发布

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#file #colors #extension #image #string #null

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本文介绍了一种利用FreeImage库加载位图文件的方法，并详细解释了如何将加载的图像转换为HBITMAP格式，以便在Windows应用程序中使用。

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HBITMAP GenericLoadBitmap(string &filepath)
{
   FREE_IMAGE_FORMAT fif = FIF_UNKNOWN;
   // check the file signature and deduce its format
   // (the second argument is currently not used by FreeImage)
   fif = FreeImage_GetFileType(filepath.c_str(), 0);
   if(fif == FIF_UNKNOWN) {
      // no signature ?
      // try to guess the file format from the file extension
      fif = FreeImage_GetFIFFromFilename(filepath.c_str());
   }
   // check that the plugin has reading capabilities ...
   if((fif != FIF_UNKNOWN) && FreeImage_FIFSupportsReading(fif)) {
      // ok, let's load the file
      FIBITMAP *dib = FreeImage_Load(fif, filepath.c_str(), 0);

      // unless a bad file format, we are done !
      CDC *pDC = GetDC();
      HBITMAP bitmap = CreateDIBitmap(pDC->GetSafeHdc(), FreeImage_GetInfoHeader(dib),
         CBM_INIT, FreeImage_GetBits(dib), FreeImage_GetInfo(dib), DIB_RGB_COLORS);
      ReleaseDC(pDC);

      FreeImage_Unload(dib);
      return bitmap;
   }
   return NULL;
}