private void GetEmbeddedObjectText(object embeddedObject, StringBuilder sbText)
{
string text;
IAccessible acc = embeddedObject as IAccessible;
if (acc != null)
{
text = acc.get_accName(NativeMethods.CHILD_SELF);
if (!string.IsNullOrEmpty(text))
{
sbText.Append(text);
return;
}
}
// Didn't get IAccessible (or didn't get a name from it).
// Try the IDataObject technique instead...
int hr = NativeMethods.S_FALSE;
IDataObject dataObject = null;
IOleObject oleObject = embeddedObject as IOleObject;
if (oleObject != null)
{
// Try IOleObject::GetClipboardData (which returns an IDataObject) first...
hr = oleObject.GetClipboardData(0, out dataObject);
}
// If that didn't work, try the embeddedObject as a IDataObject instead...
if (hr != NativeMethods.S_OK)
{
dataObject = embeddedObject as IDataObject;
}
if (dataObject == null)
{
return;
}
// Got the IDataObject. Now query it for text formats. Try Unicode first...
bool fGotUnicode = true;
UnsafeNativeMethods.FORMATETC fetc = new UnsafeNativeMethods.FORMATETC();
fetc.cfFormat = DataObjectConstants.CF_UNICODETEXT;
fetc.ptd = IntPtr.Zero;
fetc.dwAspect = DataObjectConstants.DVASPECT_CONTENT;
fetc.lindex = -1;
fetc.tymed = DataObjectConstants.TYMED_HGLOBAL;
UnsafeNativeMethods.STGMEDIUM med = new UnsafeNativeMethods.STGMEDIUM();
med.tymed = DataObjectConstants.TYMED_HGLOBAL;
med.pUnkForRelease = IntPtr.Zero;
med.hGlobal = IntPtr.Zero;
hr = dataObject.GetData(ref fetc, ref med);
if (hr != NativeMethods.S_OK || med.hGlobal == IntPtr.Zero)
{
// If we didn't get Unicode, try for ANSI instead...
fGotUnicode = false;
fetc.cfFormat = DataObjectConstants.CF_TEXT;
hr = dataObject.GetData(ref fetc, ref med);
}
// Did we get anything?
if (hr != NativeMethods.S_OK || med.hGlobal == IntPtr.Zero)
{
return;
}
//lock the memory, so data can be copied into
IntPtr globalMem = UnsafeNativeMethods.GlobalLock(med.hGlobal);
try
{
//error check for the memory pointer
if (globalMem == IntPtr.Zero)
{
return;
}
unsafe
{
//get the string
if (fGotUnicode)
{
text = new string((char *)globalMem);
}
else
{
text = new string((sbyte *)globalMem);
}
}
sbText.Append(text);
}
finally
{
//unlock the memory
UnsafeNativeMethods.GlobalUnlock(med.hGlobal);
UnsafeNativeMethods.ReleaseStgMedium(ref med);
}
}