有很多的WMF转换成像一个位图的例子： Reliable .wmf/wmf to Pixel based image conversion使用.NET将图像转换为WMF？
但我需要反向操作。我不寻找一个矢量化器。我只想在wmf文件中嵌入一张图片，而不必担心wmf格式的位和字节。我最好在C＃中使用.NET的解决方案。
我首先认为这将做的工作：
using (Image img = Image.FromFile (path)) {
img.Save (myStream, System.Drawing.Imaging.ImageFormat.Wmf);
}
但这种抱怨在运行编码器为空。在哪里/如何构建这样的编码器？我不需要一个复杂的，只是一个包装图像到一个WMF。对WMF中支持的格式有一些要求吗？我想png和bmp都支持，但是gif也支持？
从here：
当您使用Save方法一 图形图像保存为Windows图元文件 格式（WMF）或增强型图元文件 格式（EMF）文件，生成的文件 保存作为便携式网络 图形（PNG）文件。因为.NET Framework的GDI + 组件的确如此 行为发生 没有编码器，您可以使用 将文件保存为.wmf或.emf文件。
但我猜你已经有了那么远:)
Here有人把一个位图一个FileStream。
metafileStream = MakeMetafileStream(gdiBitmap);
与MakeMetafileStream（）是：
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。 但至于编码器的事...
Here从MS黄文雄登载非托管方法：
[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:\temp\test.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);
}
希望这会让你那里:)
下面是完整的答案这个问题包括我的修改。文森特的答案完全正确。只有一些定义和一个枚举失踪。这就是为什么我在这里发布“干净”的工作代码，希望对别人有用。
[Flags]
private enum EmfToWmfBitsFlags {
EmfToWmfBitsFlagsDefault = 0x00000000,
EmfToWmfBitsFlagsEmbedEmf = 0x00000001,
EmfToWmfBitsFlagsIncludePlaceable = 0x00000002,
EmfToWmfBitsFlagsNoXORClip = 0x00000004
}
private static int MM_ISOTROPIC = 7;
private static int MM_ANISOTROPIC = 8;
[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 static MemoryStream MakeMetafileStream (Bitmap image)
{
Metafile metafile = null;
using (Graphics g = Graphics.FromImage (image)) {
IntPtr hDC = g.GetHdc();
metafile = new Metafile (hDC, EmfType.EmfOnly);
g.ReleaseHdc (hDC);
}
using (Graphics g = Graphics.FromImage (metafile)) {
g.DrawImage (image, 0, 0);
}
IntPtr _hEmf = metafile.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);
string tempfile = Path.GetTempFileName();
CopyMetaFile (hmf, tempfile);
DeleteMetaFile (hmf);
DeleteEnhMetaFile (_hEmf);
var stream = new MemoryStream();
byte[] data = File.ReadAllBytes (tempfile);
//File.Delete (tempfile);
int count = data.Length;
stream.Write (data, 0, count);
return stream;
}
感谢您发布这个！我觉得我的“答案”更基于一些受过教育的Google搜索提供的一系列提示：p – 2013-05-16 11:36:53
男人，我现在爱你......我一直在尝试用WPF创建兼容wordpad的rtf近一周，并在“从图像创建一个wmeta文件”的部分残缺......谢谢 – David 2013-06-24 15:26:50
什么jdehaan发布了改进版（荣誉顺便说一句他和Vincent）
[Flags]
private enum EmfToWmfBitsFlags
{
EmfToWmfBitsFlagsDefault = 0x00000000,
EmfToWmfBitsFlagsEmbedEmf = 0x00000001,
EmfToWmfBitsFlagsIncludePlaceable = 0x00000002,
EmfToWmfBitsFlagsNoXORClip = 0x00000004
}
private static int MM_ISOTROPIC = 7;
private static int MM_ANISOTROPIC = 8;
[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);
public static MemoryStream MakeMetafileStream(System.Drawing.Bitmap image)
{
Metafile metafile = null;
using (Graphics g = Graphics.FromImage(image))
{
IntPtr hDC = g.GetHdc();
metafile = new Metafile(hDC, EmfType.EmfOnly);
g.ReleaseHdc(hDC);
}
using (Graphics g = Graphics.FromImage(metafile))
{
g.DrawImage(image, 0, 0);
}
IntPtr _hEmf = metafile.GetHenhmetafile();
uint _bufferSize = GdipEmfToWmfBits(_hEmf, 0, null, MM_ANISOTROPIC,
EmfToWmfBitsFlags.EmfToWmfBitsFlagsDefault);
byte[] _buffer = new byte[_bufferSize];
GdipEmfToWmfBits(_hEmf, _bufferSize, _buffer, MM_ANISOTROPIC,
EmfToWmfBitsFlags.EmfToWmfBitsFlagsDefault);
DeleteEnhMetaFile(_hEmf);
var stream = new MemoryStream();
stream.Write(_buffer, 0, (int)_bufferSize);
stream.Seek(0, 0);
return stream;
}
这一个不留临时文件的背后，也避免了复制_bufferSize到一个临时文件只能再复制它到另一个缓冲区。 再次感谢你们。
这里是为我工作一个Win32 GDI +的例子（信贷http://www.codeproject.com/Articles/6879/How-to-use-GDI-to-save-image-in-WMF-EXIF-or-EMF-fo）
Bitmap *image;
image = Bitmap::FromFile(L"in.jpg"); // read in the JPG
HDC hdc = GetDC(hwnd); // parent window
Metafile *metafile = new Metafile(L"out.wmf", hdc);
Graphics *graphics = new Graphics(metafile);
graphics->DrawImage(image, 0, 0, image->GetWidth(), image->GetHeight());
delete graphics; delete metafile; delete image;
ReleaseDC(hwnd, hdc);
非常感谢您对这些链接，遗憾的是它并没有我的情况下工作了... – jdehaan 2011-03-11 12:33:41
好像WMF是“无论如何，在它的出路上。也许这是你为什么必须切换到另一种格式的理由？ ：p – 2011-03-11 13:02:21
是的，我真的不喜欢那些废话的东西，相信我......我只需要用数据喂养一个老式的工具，它对于支持的格式非常不情愿。 – jdehaan 2011-03-11 17:28:38