Pass window handle to COM from C#

[EDN Admin]

I want to pass window Handle to my COM from c#.
in IDL [id(17), helpstring("method SetWindowHandle")] HRESULT SetWindowHandle([in]LONG_PTR** hwnd);

in .cppSTDMETHODIMP CActiveIXFSSIU::SetWindowHandle(LONG_PTR** hwnd)
{
AFX_MANAGE_STATE(AfxGetStaticModuleState());

this->m_hWnd = (HWND)&hwnd;

return S_OK;
}

in C#;private void button2_Click(object sender, EventArgs e)
{
AXT.SetWindowHandle(this.Handle);
}



but my program is not working....

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