c++ - 将 PID 转换为 HWND

Question

基本上，我想将进程 ID 转换为 HWND。我正在使用这段代码:

   DWORD   dwWindowId;
   CHAR       pszClassName[200];
   HWND     hWnd;

   hWnd = GetTopWindow (NULL);

   while ( hWnd != NULL )
   {
      if ( GetClassName (hWnd, pszClassName, 200) > 0)
         if ( lstrcmpiA (lpcszWindowClass, pszClassName) == 0)
            if ( GetWindowThreadProcessId (hWnd, &dwWindowId) )
               if ( dwWindowId == dwProcessId )
                  return hWnd;

      hWnd = GetNextWindow ( hWnd, GW_HWNDNEXT );
   }
   return NULL;

在我尝试使用一个由 CreateProcess 创建的进程之前，它工作正常。在这种情况下我该怎么办？我从 CreateProcess 中获得了进程信息，例如它的 ID 和线程 ID，但我仍然不知道如何获取它的 hwnd。我读过这个:

After you call CreateProcess(), examine the PROCESS_INFORMATION struct pointed to by lpProcessInformation argument. PROCESS_INFORMATION contains a handle to the Process you just started and a Thread ID. With this information call the GetGUIThreadInfo()function and then examine the GUITHREADINFO struct pointed to by lpgui. GUITHREADINFO has several HWNDs. Start with hwndActive, and call GetParent() or GetAncestor() untill the Main window is found.

By bug_crusher

我试过 EnumChildWindows() 和 EnumWindows()，但它们没有用。

BOOL CALLBACK EnumWindowsProc(HWND hwnd, LPARAM lParam)
{
    DWORD PID =0;
    GetWindowThreadProcessId(hwnd,&PID);
    if(PID == 1)
    {
        //,,,,,,,,
    }
    return TRUE;
}

但是我不明白，谁能解释一下？

Answer 1

我对您实际尝试做的事情感到有点困惑，但此函数将构建属于指定进程的所有顶级窗口的 vector 。

void GetWindowsOfProcess(DWORD dwId, std::vector<HWND>& vecWindows)
{
    struct WindowsOfProcess
    {
        std::vector<HWND>*  pvecWindows;
        DWORD               dwProcId;

        static BOOL CALLBACK EnumProc(HWND hWnd, LPARAM lParam)
        {
            DWORD dwProcId;
            GetWindowThreadProcessId(hWnd, &dwProcId);
            if (dwProcId == reinterpret_cast<WindowsOfProcess*>(lParam)->dwProcId)
                reinterpret_cast<WindowsOfProcess*>(lParam)->pvecWindows->push_back(hWnd);
            return TRUE;
        }

        WindowsOfProcess(DWORD dwId, std::vector<HWND>* pvec)
            :   dwProcId(dwId)
            ,   pvecWindows(pvec)
        {
            EnumWindows(EnumProc, reinterpret_cast<LPARAM>(this));
        }
    };
    WindowsOfProcess wop(dwId, &vecWindows);
}