c++ 使用管道获取CMD命令结果

UINT __cdecl ThreadProc(LPVOID lParam)
{
HWND hWnd = (HWND)lParam;
ASSERT(hWnd);

TCHAR szApp[MAX_PATH] = _T("netstat -s");
HANDLE hRead = NULL;
HANDLE hWrite = NULL;
SECURITY_ATTRIBUTES sa = {0};
sa.nLength = sizeof(sa);
sa.lpSecurityDescriptor = NULL;
sa.bInheritHandle = TRUE;

if(!CreatePipe(&hRead, &hWrite, &sa, 0))
{
AfxMessageBox(_T("CreatePipe failed."));
return -1;
}

STARTUPINFO si = {sizeof(si)};
PROCESS_INFORMATION pi = {0};
si.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
si.hStdOutput = hWrite;
si.hStdError = hWrite;
si.wShowWindow = SW_HIDE;

if(!CreateProcess(NULL, szApp, NULL, NULL, TRUE, NULL, NULL, NULL, &si, &pi))
{
CloseHandle(hWrite);
CloseHandle(hRead);
return -1;
}

CloseHandle(pi.hThread);
CloseHandle(pi.hProcess);
CloseHandle(hWrite);
#define MAX_BUFFER 1024
TCHAR szBuf[MAX_BUFFER] = {0};
DWORD dwRead = 0;
CString strText(_T(""));

while(ReadFile(hRead, szBuf, MAX_BUFFER-1, &dwRead, NULL))
{
strText += szBuf;
memset(szBuf, 0, sizeof(szBuf));
}
CloseHandle(hRead);
AfxMessageBox(strText);
return 0;
}