有大量的转换WMF到像一个位图的例子： Reliable .WMF / WMF到基于像素的图像转换

There are plenty of examples of converting a wmf into a bitmap like: Reliable .wmf/wmf to Pixel based image conversion

但我需要反向操作。我不看的向量化。我只是想嵌入内部WMF文件的图像，而无需理会位和WMF格式的字节。我需要.NET preferably在C＃中的解决方案。

But I need the reverse operation. I do not look for a vectorizer. I just want to embed a picture inside a wmf file without having to bother about the bits and bytes of the wmf format. I need a solution for .NET preferably in C#.

我首先认为这会做的工作：

I first thought this would do the job:

using (Image img = Image.FromFile (path)) {
    img.Save (myStream, System.Drawing.Imaging.ImageFormat.Wmf);
}

但这种抱怨在运行时，该连接codeR为空。在哪里/我怎样才能建立这样的连接codeR？我并不需要一个复杂的，只是一个包装图像插入WMF。是否有对WMF支持的格式一些要求？我想，PNG和BMP的支持，但GIF也支持？

But this complains at runtime that the encoder is null. Where/How can I build such an encoder? I do not need a complicated one, just one that wraps an image into a wmf. Are there some requirements on the supported formats in WMF? I suppose png and bmp are supported but is gif also supported?

推荐答案

从的这里：

当您使用Save方法来保存   图形图像作为Windows图元文件   格式（WMF）或增强型图元文件   格式（EMF）文件，产生的文件   保存为可移植网络   图形（PNG）文件代替。本   出现问题的原因GDI +   .NET Framework的组件执行   没有一间codeR，您可以使用   将文件保存为.WMF或.EMF文件。

When you use the Save method to save a graphic image as a Windows Metafile Format (WMF) or Enhanced Metafile Format (EMF) file, the resulting file is saved as a Portable Network Graphics (PNG) file instead. This behavior occurs because the GDI+ component of the .NET Framework does not have an encoder that you can use to save files as .wmf or .emf files.

不过，我想你已经做到那一步：）

But I guess you already got that far :)

这里有人把一个位图一个FileStream。

Here someone is putting a bitmap in a FileStream.

metafileStream = MakeMetafileStream(gdiBitmap);

与MakeMetafileStream（）的存在：

with MakeMetafileStream() being:

private static MemoryStream MakeMetafileStream(Bitmap image)
{
  Graphics graphics = null;
  Metafile metafile= null;
  var stream = new MemoryStream();
  try
  {
    using (graphics = Graphics.FromImage(image))
    {
      var hdc = graphics.GetHdc();
      metafile= new Metafile(stream, hdc);
      graphics.ReleaseHdc(hdc);
    }
    using (graphics = Graphics.FromImage(metafile))
    { graphics.DrawImage(image, 0, 0); }
  }
  finally
  {
    if (graphics != null)
    { graphics.Dispose(); }
    if (metafile!= null)
    { metafile.Dispose(); }
  }
  return stream;
}

有趣的东西。 但作为对EN codeR事情...

Interesting stuff. But as to the encoder thing...

这里黄文雄从微软发布的这个非托管方式：

Here Peter Huang from MS posted this unmanaged approach:

        [DllImport("gdiplus.dll")]
        private static extern uint GdipEmfToWmfBits (IntPtr _hEmf, uint _bufferSize,
            byte[] _buffer, int _mappingMode, EmfToWmfBitsFlags _flags);
        [DllImport("gdi32.dll")]
        private static extern IntPtr SetMetaFileBitsEx (uint _bufferSize,
            byte[] _buffer);
        [DllImport("gdi32.dll")]
        private static extern IntPtr CopyMetaFile (IntPtr hWmf,
            string filename);
        [DllImport("gdi32.dll")]
        private static extern bool DeleteMetaFile (IntPtr hWmf);
        [DllImport("gdi32.dll")]
        private static extern bool DeleteEnhMetaFile (IntPtr hEmf);
        private void button4_Click(object sender, System.EventArgs e)
        {
            Graphics g= this.CreateGraphics();
            IntPtr hDC = g.GetHdc();
            Metafile mf = new Metafile(hDC,EmfType.EmfOnly);
            g.ReleaseHdc(hDC);
            g.Dispose();
            g=Graphics.FromImage(mf);
            //Pen p = new Pen(Color.White,5);
            g.DrawArc(Pens.Black,0,0,200,200,0,360);
            //g.DrawImage(Bitmap.FromFile(@"c:temptest.bmp"),0,0);
            g.Dispose();
            IntPtr _hEmf= mf.GetHenhmetafile();
            uint _bufferSize = GdipEmfToWmfBits(_hEmf, 0, null, MM_ANISOTROPIC,
                EmfToWmfBitsFlags.EmfToWmfBitsFlagsDefault);
            byte[] _buffer = new byte[_bufferSize];
            GdipEmfToWmfBits(_hEmf, _bufferSize, _buffer, MM_ANISOTROPIC,
                    EmfToWmfBitsFlags.EmfToWmfBitsFlagsDefault);
            IntPtr hmf = SetMetaFileBitsEx(_bufferSize, _buffer);
            CopyMetaFile(hmf, "C:\ConvertedMetafile.wmf");
            DeleteMetaFile(hmf);
            DeleteEnhMetaFile(_hEmf);
        }

希望这将让你有：）

Hope this'll get you there :)