c++ - 如何确定使用 ShellExecuteEx 创建的进程是否拥有一个窗口？

Question

我正在使用 ShellExecuteEx 来运行外部应用程序:

SHELLEXECUTEINFO shExInfo = { 0 };
    shExInfo.cbSize = sizeof(shExInfo);
    shExInfo.fMask = SEE_MASK_NOCLOSEPROCESS;
    shExInfo.hwnd = 0;
    shExInfo.lpVerb = L"runas";                // Operation to perform
    shExInfo.lpFile = windowStringContainingAppPath.c_str();       // Application to start    
    shExInfo.lpParameters = windowStringContainingAppParameters.c_str();                  // Additional parameters
    shExInfo.lpDirectory = 0;
    shExInfo.nShow = SW_SHOW;
    shExInfo.hInstApp = 0;

    if(ShellExecuteEx(&shExInfo))
    {
        WaitForSingleObject(shExInfo.hProcess, INFINITE);

        DeleteFile(wsMesh3dx64Parameter.c_str());

        CloseHandle(shExInfo.hProcess);
    }

一切正常，但此外部应用程序存在意外行为，即在关闭其主窗口后，其进程仍处于事件状态。 这可以防止 WaitForSingleObject(shExInfo.hProcess, INFINITE); 返回，我必须手动终止进程。

相反，我正在寻找一种方法来替换 WaitForSingleObject(shExInfo.hProcess, INFINITE);，用一个循环检查外部进程是否拥有一个窗口，如果没有则终止它。

这是我想到的，如果有更好的办法请指点一下。

更新:

感谢 Robson 的回答，我设法完成了我打算做的事情:

struct Porcess_ID_HWND
{
    DWORD processID;
    HWND processhWnd;
};

BOOL CALLBACK EnumWindowsProc(HWND hWnd, LPARAM lParam)
{
    Porcess_ID_HWND*info = (Porcess_ID_HWND*)lParam;

    DWORD processID;
    GetWindowThreadProcessId(hWnd, &processID);

    if (processID == info->processID){
        info->processhWnd = hWnd;
        return FALSE;
    }

    return TRUE;
}

还有我的循环:

if(ShellExecuteEx(&shExInfo))
{
    DWORD dwProcessID = GetProcessId(shExInfo.hProcess);

    Porcess_ID_HWND info;
    info.processID = dwProcessID;
    // wait for window to appear
    do
    {
        info.processhWnd = NULL;
        EnumWindows(EnumWindowsProc, (LPARAM)&info);

    } while (!info.processhWnd);

    // wait for window to close
    do
    {
        info.processhWnd = NULL;
        EnumWindows(EnumWindowsProc, (LPARAM)&info);

    } while (info.processhWnd);

    //WaitForSingleObject(shExInfo.hProcess, INFINITE);

    DeleteFile(wsMesh3dx64Parameter.c_str());

    CloseHandle(shExInfo.hProcess);
}

Answer 1

在 http://forums.codeguru.com/showthread.php?392273-RESOLVED-How-to-get-window-s-HWND-from-it-s-process-handle 找到了一个很好的答案

1)
HAVE: Process ID, NEED: Process handle
Solution: OpenProcess()

2)
HAVE: Process handle, NEED: Process ID
Solution: GetProcessId()

3)
HAVE: Window handle, NEED: Process ID
Solution: GetWindowThreadProcessId()

4)
HAVE: Window handle, NEED: Process handle
Solution: Use 3) and then 1)

5)
HAVE: Process ID, NEED: Window handle
Solution: EnumWindows(), then in the callback function do 3) and check if it matches your process ID.

6)
HAVE: Process handle, NEED: Window handle
Solution: 2) and then 5)

所以你是第 6 种情况。如果没有窗口句柄的进程 ID 与你的 shExInfo.hProcess 的进程 ID 匹配，那么 shExInfo.hProcess 不拥有任何窗口