有很多的WMF轉換成像一個位圖的例子： Reliable .wmf/wmf to Pixel based image conversion使用.NET將圖像轉換爲WMF？
但我需要反向操作。我不尋找一個矢量化器。我只想在wmf文件中嵌入一張圖片，而不必擔心wmf格式的位和字節。我最好在C＃中使用.NET的解決方案。
我首先認爲這將做的工作：
using (Image img = Image.FromFile (path)) {
img.Save (myStream, System.Drawing.Imaging.ImageFormat.Wmf);
}
但這種抱怨在運行編碼器爲空。在哪裏/如何構建這樣的編碼器？我不需要一個複雜的，只是一個包裝圖像到一個WMF。對WMF中支持的格式有一些要求嗎？我想png和bmp都支持，但是gif也支持？
從here：
當您使用Save方法一 圖形圖像保存爲Windows圖元文件 格式（WMF）或增強型圖元文件 格式（EMF）文件，生成的文件 保存作爲便攜式網絡 圖形（PNG）文件。因爲.NET Framework的GDI + 組件的確如此 行爲發生 沒有編碼器，您可以使用 將文件保存爲.wmf或.emf文件。
但我猜你已經有了那麼遠:)
Here有人把一個位圖一個FileStream。
metafileStream = MakeMetafileStream(gdiBitmap);
與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;
}
有趣的東西。 但至於編碼器的事...
Here從MS黃文雄登載非託管方法：
[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);
}
希望這會讓你那裏:)
下面是完整的答案這個問題包括我的修改。文森特的答案完全正確。只有一些定義和一個枚舉失蹤。這就是爲什麼我在這裏發佈「乾淨」的工作代碼，希望對別人有用。
[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;
}
感謝您發佈這個！我覺得我的「答案」更基於一些受過教育的Google搜索提供的一系列提示：p – 2013-05-16 11:36:53
男人，我現在愛你......我一直在嘗試用WPF創建兼容wordpad的rtf近一週，並在「從圖像創建一個wmeta文件」的部分殘缺......謝謝 – David 2013-06-24 15:26:50
什麼jdehaan發佈了改進版（榮譽順便說一句他和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;
}
這一個不留臨時文件的背後，也避免了複製_bufferSize到一個臨時文件只能再複製它到另一個緩衝區。 再次感謝你們。
這裏是爲我工作一個Win32 GDI +的例子（信貸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);
非常感謝您對這些鏈接，遺憾的是它並沒有我的情況下工作了... – jdehaan 2011-03-11 12:33:41
好像WMF是「無論如何，在它的出路上。也許這是你爲什麼必須切換到另一種格式的理由？ ：p – 2011-03-11 13:02:21
是的，我真的不喜歡那些廢話的東西，相信我......我只需要用數據餵養一個老式的工具，它對於支持的格式非常不情願。 – jdehaan 2011-03-11 17:28:38