public static void Save(this Metafile metafile, Stream stream, bool forceWmfFormat)
{
if (metafile == null)
{
throw new ArgumentNullException(nameof(metafile), PublicResources.ArgumentNull);
}
if (stream == null)
{
throw new ArgumentNullException(nameof(stream), PublicResources.ArgumentNull);
}
if (!OSUtils.IsWindows)
{
throw new PlatformNotSupportedException(Res.RequiresWindows);
}
bool isWmf = metafile.RawFormat.Guid == ImageFormat.Wmf.Guid;
if (isWmf || forceWmfFormat)
{
WriteWmfHeader(metafile, stream);
}
// making a clone, otherwise, it will not be usable after saving
metafile = (Metafile)metafile.Clone();
IntPtr handle = metafile.GetHenhmetafile();
try
{
byte[] buffer = isWmf ? Gdi32.GetWmfContent(handle)
: (forceWmfFormat ? Gdi32.GetWmfContentFromEmf(handle) : Gdi32.GetEmfContent(handle));
stream.Write(buffer, 0, buffer.Length);
}
finally
{
if (isWmf)
{
Gdi32.DeleteMetaFile(handle);
}
else
{
Gdi32.DeleteEnhMetaFile(handle);
}
metafile.Dispose();
}
}
private void propertiesComboBox__SelectedIndexChanged(object sender, EventArgs e)
{
var selectedItem = propertiesComboBox_.SelectedItem;
if (selectedItem == null)
{
return;
}
switch (selectedItem.ToString())
{
case "Metafile":
propertyGrid_.SelectedObject = metafile_;
break;
case "MetafileHeader":
propertyGrid_.SelectedObject = metafile_.GetMetafileHeader();
break;
case "ENHMETAHEADER":
using (var metafile = MetafileUtility.CopyMetafile(ref metafile_))
{
// Metafile.GetHenhmetafile is just a wrapper of GdipGetHemfFromMetafile:
// https://github.com/dotnet/runtime/blob/78c6505cffe2558b036fbe44cd27038affbb6cce/src/libraries/System.Drawing.Common/src/System/Drawing/Imaging/Metafile.Windows.cs#L379-L383
// and according to:
// http://www.jose.it-berater.org/gdiplus/reference/flatapi/graphics/gdipgethemffrommetafile.htm
// > GdipGetHemfFromMetafile:
// > This method sets the Metafile object to an invalid state. The user is responsible for calling DeleteEnhMetafile,
// > to delete the Windows handle.
var enhMetafileHandle = metafile.GetHenhmetafile();
if (enhMetafileHandle != IntPtr.Zero)
{
var header = Gdi32.GetEnhMetaFileHeader(enhMetafileHandle);
propertyGrid_.SelectedObject = new EnhMetaHeader(header);
Gdi32.DeleteEnhMetaFile(enhMetafileHandle);
}
}
break;
default:
Debug.Assert(false);
break;
}
}
