为啥EnumWindows经常找不到进程窗口？

[lovev8]

以下代码运行时10次至少有1次无法找到进程主窗口，问题在哪？

BOOL CALLBACK EnumWindowCallBack(HWND hWnd, LPARAM lParam)  
{  
    ProcessWindow *pProcessWindow = (ProcessWindow *)lParam;  
  
    DWORD dwProcessId;  GetWindowThreadProcessId(hWnd, &dwProcessId);  

    if (pProcessWindow->dwProcessId == dwProcessId && IsWindow(hWnd) && GetParent(hWnd) == NULL) 
    {  
        pProcessWindow->hwndWindow = hWnd;  
        return FALSE;
    }  
    return TRUE;  
}  

BOOL MyCreateProcess()
{
    STARTUPINFO si;  
    memset(&si, 0, sizeof(STARTUPINFO));  
    si.cb = sizeof(STARTUPINFO);  
    si.dwFlags = STARTF_USESHOWWINDOW;  
    si.wShowWindow = SW_SHOW;  
  
    // 进程信息  
    PROCESS_INFORMATION pi;  


    if(CreateProcess(L"E:\\test.exe", NULL, NULL, NULL, false, 0, NULL, NULL, &si, &pi))  
    {  
        ProcessWindow procwin;  
        procwin.dwProcessId = pi.dwProcessId;  
        procwin.hwndWindow = NULL;  
  
        WaitForInputIdle(pi.hProcess, 5000);  
        EnumWindows(EnumWindowCallBack, (LPARAM)&procwin);  
        g_hTestWnd = procwin.hwndWindow;
    }
    else
	g_hTestWnd = NULL;
    return (g_hTestWnd?TRUE:FALSE);
}

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#include "stdafx.h"
#include "afxwin.h"

HWND g_hTestWnd;

typedef struct tage
{
	DWORD dwProcessId;
	HWND hwndWindow;
}ProcessWindow;

BOOL CALLBACK EnumWindowCallBack(HWND hWnd, LPARAM lParam)  
{  
    ProcessWindow *pProcessWindow = (ProcessWindow *)lParam;  
  
    DWORD dwProcessId;  GetWindowThreadProcessId(hWnd, &dwProcessId);  

    if (pProcessWindow->dwProcessId == dwProcessId && IsWindow(hWnd) && GetParent(hWnd) == NULL) 
    {  
        pProcessWindow->hwndWindow = hWnd;  
        return FALSE;
    }  
    return TRUE;  
}  

BOOL MyCreateProcess()
{
    STARTUPINFO si;  
    memset(&si, 0, sizeof(STARTUPINFO));  
    si.cb = sizeof(STARTUPINFO);  
    si.dwFlags = STARTF_USESHOWWINDOW;  
    si.wShowWindow = SW_SHOW;  
  
    // 进程信息  
    PROCESS_INFORMATION pi;  


    if(CreateProcess("c:\\windows\\notepad.exe", NULL, NULL, NULL, false, 0, NULL, NULL, &si, &pi))  
    {  
        ProcessWindow procwin;  
        procwin.dwProcessId = pi.dwProcessId;  
        procwin.hwndWindow = NULL;  
  
        WaitForInputIdle(pi.hProcess, 5000);  
        EnumWindows(EnumWindowCallBack, (LPARAM)&procwin);  
        g_hTestWnd = procwin.hwndWindow;
    }
    else
    g_hTestWnd = NULL;
    return (g_hTestWnd?TRUE:FALSE);
}


int main(int argc, char* argv[])
{
	BOOL r = MyCreateProcess();

	printf( "r = %d\r\n", r );

	return 0;
}

没发现问题，有的时候慢倒是。

[cbzjzsb123]