Duplicate Windows Handle of a local process - c++

Question

Use Case
I have a 64 bit server process which through IPC (COM+ RPC) gains access to the PID of a 32 bit Client Process. The Server Process Creates a new Window with a parent Window Handler. I need to display the New Window inside the Client's Window instead of a standalone popup on top of the Desktop Window.
Process Adopted
In order to Display the New Window on the parent Window, I first tried to
Get the Handle to the Top Window
Duplicate the Window Handle using DuplicateHandle
Create the new Window with the new Duplicate Window Handle
Code
In Order to Duplicate the Window Handle I adopted the following Code. Note this is not the actual code, but for brevity changed the non relevant parts. Also Note, the SetPriviledge Function was adopted from Enabling and Disabling Privileges in C++
bool Duplicate(HWND hWnd)
{
HANDLE pToken = NULL;
HANDLE hProcess = NULL;
HANDLE hDuplicateHandle = NULL;
DWORD pid = 0;
bool bReturn = true;
GetWindowThreadProcessId(hWnd, &pid);
if(!(hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, pid)))
{
std::cout<<"Cannot Open Process:"<<GetLastError()<<std::endl;
bReturn = false;
}
if(bReturn && !OpenProcessToken(
hProcess,
TOKEN_ALL_ACCESS,
&pToken ))
{
std::cout<<"Cannot Open Token:"<<GetLastError()<<std::endl;
bReturn = false;
}
//The SetPriviledge function was adopted from
//http://msdn.microsoft.com/en-us/library/windows/desktop/aa446619(v=vs.85).aspx
if (bReturn && !SetPrivilege(
pToken,
SE_DEBUG_NAME,
true ))
{
std::cout<<"Error Setting Priveledge:error"<<GetLastError()<<std::endl;
bReturn = false;
}
if(bReturn && !DuplicateHandle(
hProcess,
hWnd,
GetCurrentProcess(),
&hDuplicateHandle,
NULL,
NULL,
DUPLICATE_SAME_ACCESS))
{
std::cout<<"Error Duplicating Handle: "<<GetLastError()<<std::endl;
std::cout<<"Source Handle is "<<hWnd<<" And the Duplicate Handle is "<<hDuplicateHandle<<std::endl;
bReturn = false;
}
if (hProcess)
{
CloseHandle(hProcess);
}
return bReturn;
}
O/P From the Above Code
Error Duplicating Handle: 6
Source Handle is 00150C1C And the Duplicate Handle is 00000000
Press any key to continue . . .
i.e. The Code fails with Error Code 6: ERROR_INVALID_HANDLE
Goal
To Make the above code work so that I can Duplicate a Remote Windows handle of a Local Process. Alternatively, determine if the above is the correct process.