Question

嗨，我对c ++很新。

Image im(L"C:\\Temp\\SnapShotOutput.jpg");
im.RotateFlip(Rotate90FlipNone);
im.Save("SampleImage_rotated.jpg");

我正在尝试上面的代码来旋转图像并保存... 它不会工作.compile在第3行失败

'Gdiplus::Image::Save' : no overloaded function takes 1 arguments

它给出了上述错误。任何人都可以帮助我。

Answer 1

您也应该设置其他参数。代码来自here。

Image image(L"C:\\Temp\\SnapShotOutput.jpg");
image.RotateFlip(Rotate90FlipNone);

// Save the altered image as PNG
CLSID pngClsid;
GetEncoderClsid(L"image/png", &pngClsid);
image.Save(L"SampleImage_rotated.png", &pngClsid, NULL);

// Save the altered image as JPG
CLSID jpegClsid;
GetEncoderClsid(L"image/jpeg", &jpegClsid);
image.Save(L"SampleImage_rotated.jpg", &jpegClsid, NULL);

GetEncoderClsid 函数定义为here：

int GetEncoderClsid(const WCHAR* format, CLSID* pClsid)
{
   UINT  num = 0;          // number of image encoders
   UINT  size = 0;         // size of the image encoder array in bytes

   ImageCodecInfo* pImageCodecInfo = NULL;

   GetImageEncodersSize(&num, &size);
   if(size == 0)
      return -1;  // Failure

   pImageCodecInfo = (ImageCodecInfo*)(malloc(size));
   if(pImageCodecInfo == NULL)
      return -1;  // Failure

   GetImageEncoders(num, size, pImageCodecInfo);

   for(UINT j = 0; j < num; ++j)
   {
      if( wcscmp(pImageCodecInfo[j].MimeType, format) == 0 )
      {
         *pClsid = pImageCodecInfo[j].Clsid;
         free(pImageCodecInfo);
         return j;  // Success
      }    
   }

   free(pImageCodecInfo);
   return -1;  // Failure
}

用c ++旋转图像

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