how can I Passing Window Handle from unmanaged code to COM(written in
c#).  In one of the old unmanaged code(c++) function, it gets a
paramter as hwnd, and the com componenent need to access the hwnd. 
Here is the sample code that I wrote in C#(com part)
public void Example(IntPtr parentForm)
{
		System.Windows.Forms.NativeWindow
testwin=System.Windows.Forms.NativeWindow.FromHandle(parentForm);
......

However, the testwind has undefined value.

---

Clarification of Question by g7steve-ga on 20 Sep 2004 12:51 PDT

I missed posting the interface 
void SccRunScc(IntPtr parentForm);

And from the Unmanaged Code

EXTFUN example(HWND hWnd, )
{
	if (g_ISCC!= NULL)
	{
		g_ISCC->SccRunScc((long)hWnd);
....