GetProcessMainWnd(获取进程窗口句柄)

typedef struct tagWNDINFO
{
		DWORD dwProcessId;
		HWND hWnd;
} WNDINFO, *LPWNDINFO;


BOOL CALLBACK YourEnumProc(HWND hWnd, LPARAM lParam)
{
		DWORD dwProcessId;
		GetWindowThreadProcessId(hWnd, &dwProcessId);
		LPWNDINFO pInfo = (LPWNDINFO)lParam;
		if( (dwProcessId == pInfo->dwProcessId))
		{
				pInfo->hWnd = hWnd;
				return FALSE;
		}
		return TRUE;
}

//获取进程窗口句柄
HWND GetProcessMainWnd(DWORD dwProcessId)
{
	WNDINFO wi={0};
	wi.dwProcessId = dwProcessId;
	EnumWindows(YourEnumProc,(LPARAM)&wi);
	HWND re_hwnd = wi.hWnd;
	while( GetParent(re_hwnd) != NULL )
	{
		re_hwnd = GetParent( re_hwnd );
	}

	return re_hwnd;
}