private IntPtr GetImage()
{
if (OleObject == null)
{
return(IntPtr.Zero);
}
IntPtr hDC = Natives.CreateDC("DISPLAY", null, null, IntPtr.Zero);
Metafile mf = new Metafile(hDC, EmfType.EmfOnly);
using (var g = Graphics.FromImage(mf))
{
OleObject.Draw(g);
}
IntPtr _hEmf = mf.GetHenhmetafile();
uint _bufferSize = Natives.GdipEmfToWmfBits(_hEmf, 0, null, Natives.MM_ANISOTROPIC,
Natives.EmfToWmfBitsFlags.EmfToWmfBitsFlagsDefault);
byte[] _buffer = new byte[_bufferSize];
Natives.GdipEmfToWmfBits(_hEmf, _bufferSize, _buffer, Natives.MM_ANISOTROPIC,
Natives.EmfToWmfBitsFlags.EmfToWmfBitsFlagsDefault);
IntPtr hwmf = Natives.SetMetaFileBitsEx(_bufferSize, _buffer);
var pic = Marshal.AllocHGlobal(20);
Marshal.WriteInt32(pic, 0, 8 /*MM_ANISOTROPIC*/);
Marshal.WriteInt32(pic, 4, 20000);
Marshal.WriteInt32(pic, 8, 20000);
Marshal.WriteIntPtr(pic, 12, hwmf);
return(pic);
}