如何获得ShellExecuteEx..hProcess打开的窗口的hWnd?

2022-01-02 00:00:00 process window c++ handle

这个简单"的问题似乎充满了附带问题.
例如.新进程是否打开多个窗口；它有启动画面吗?
有没有简单的方法?(我正在启动 Notepad++ 的新实例)

This "simple" issue seems to be fraught with side issues.
eg. Does the new process open multiple windows; Does it have a splash screen?
Is there a simple way? (I'm starting a new instance of Notepad++)

...
std::tstring  tstrNotepad_exe = tstrProgramFiles + _T("\Notepad++\notepad++.exe");

SHELLEXECUTEINFO SEI={0};
sei.cbSize       = sizeof(SHELLEXECUTEINFO);
sei.fMask        = SEE_MASK_NOCLOSEPROCESS;
sei.hwnd         = hWndMe;  // This app's window handle
sei.lpVerb       = _T("open");
sei.lpFile       = tstrNotepad_exe.c_str();     
sei.lpParameters = _T(" -multiInst -noPlugins -nosession -notabbar ";   
sei.lpDirectory  = NULL;
sei.nShow        = SW_SHOW;
sei.hInstApp     = NULL;    
if( ShellExecuteEx(&sei) )
{ // I have sei.hProcess, but how best to utilize it from here?
}
...

推荐答案

首先使用 WaitForInputIdle 暂停你的程序，直到应用程序启动并等待用户输入(主窗口应该已经创建到那时)，然后使用EnumWindows和GetWindowThreadProcessId来判断系统中哪些窗口属于创建的进程.

First use WaitForInputIdle to pause your program until the application has started and is waiting for user input (the main window should have been created by then), then use EnumWindows and GetWindowThreadProcessId to determine which windows in the system belong to the created process.

例如:

struct ProcessWindowsInfo
{
    DWORD ProcessID;
    std::vector<HWND> Windows;

    ProcessWindowsInfo( DWORD const AProcessID )
        : ProcessID( AProcessID )
    {
    }
};

BOOL __stdcall EnumProcessWindowsProc( HWND hwnd, LPARAM lParam )
{
    ProcessWindowsInfo *Info = reinterpret_cast<ProcessWindowsInfo*>( lParam );
    DWORD WindowProcessID;

    GetWindowThreadProcessId( hwnd, &WindowProcessID );

    if( WindowProcessID == Info->ProcessID )
        Info->Windows.push_back( hwnd );

    return true;
}

....

if( ShellExecuteEx(&sei) )
{
    WaitForInputIdle( sei.hProcess, INFINITE );

    ProcessWindowsInfo Info( GetProcessId( sei.hProcess ) );

    EnumWindows( (WNDENUMPROC)EnumProcessWindowsProc,
        reinterpret_cast<LPARAM>( &Info ) );

    // Use Info.Windows.....
}

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