获取当前进程的窗口句柄

main.cpp

struct _TempHandleData {
    unsigned long processId;
    HWND windowHandle;
};

BOOL isMainWindow(HWND handle)
{
    return ::GetWindow(handle, GW_OWNER) == (HWND)0 && ::IsWindowVisible(handle);
}

BOOL CALLBACK enumWindowsCallback(HWND handle, LPARAM lParam)
{
    _TempHandleData& data = *(_TempHandleData*)lParam;
    unsigned long process_id = 0;
    ::GetWindowThreadProcessId(handle, &process_id);
    if (data.processId != process_id || !isMainWindow(handle))
        return TRUE;
    data.windowHandle = handle;
    return FALSE;
}

HWND GetMainWindow(unsigned long process_id)
{
    _TempHandleData data;
    data.processId = process_id;
    data.windowHandle = 0;
    ::EnumWindows(enumWindowsCallback, (LPARAM)&data);
    return data.windowHandle;
}

GetMainWindow(::GetCurrentProcessId());