public static extern int OleCreateFromFile([In] ref Guid rclsid,
[MarshalAs(UnmanagedType.LPWStr)] string lpszFileName,
[In] ref Guid riid,
uint renderopt,
ref FORMATETC pFormatEtc,
IOleClientSite pClientSite,
IStorage pStg,
[MarshalAs(UnmanagedType.IUnknown)] out object ppvObj);
public bool InsertImageFromFile(string strFilename, int position)
{
ILockBytes bytes;
IStorage storage;
IOleClientSite site;
object obj2;
NativeMethods.CreateILockBytesOnHGlobal(IntPtr.Zero, true, out bytes);
NativeMethods.StgCreateDocfileOnILockBytes(bytes, 0x1012, 0, out storage);
IRichEditOle.GetClientSite(out site);
FORMATETC pFormatEtc = new FORMATETC();
pFormatEtc.cfFormat = (CLIPFORMAT)0;
pFormatEtc.ptd = IntPtr.Zero;
pFormatEtc.dwAspect = DVASPECT.DVASPECT_CONTENT;
pFormatEtc.lindex = -1;
pFormatEtc.tymed = TYMED.TYMED_NULL;
Guid riid = new Guid("{00000112-0000-0000-C000-000000000046}");
Guid rclsid = new Guid("{00000000-0000-0000-0000-000000000000}");
NativeMethods.OleCreateFromFile(ref rclsid, strFilename, ref riid, 1, ref pFormatEtc, site, storage, out obj2);
if (obj2 == null)
{
Marshal.ReleaseComObject(bytes);
Marshal.ReleaseComObject(site);
Marshal.ReleaseComObject(storage);
return false;
}
IOleObject pUnk = (IOleObject)obj2;
Guid pClsid = new Guid();
pUnk.GetUserClassID(ref pClsid);
NativeMethods.OleSetContainedObject(pUnk, true);
REOBJECT lpreobject = new REOBJECT();
lpreobject.posistion = position;
lpreobject.clsid = pClsid;
lpreobject.pstg = storage;
lpreobject.poleobj = Marshal.GetIUnknownForObject(pUnk);
lpreobject.polesite = site;
lpreobject.dvAspect = 1;
lpreobject.dwFlags = 2;
lpreobject.dwUser = 0;
IRichEditOle.InsertObject(lpreobject);
Marshal.ReleaseComObject(bytes);
Marshal.ReleaseComObject(site);
Marshal.ReleaseComObject(storage);
Marshal.ReleaseComObject(pUnk);
return true;
}