通过管道实现简单的父子进程通讯

void CLikeCmdDlg::OnBtnExe()
{
    // TODO: Add your control notification handler code here
    UpdateData();
    CString cs(m_childProcess);
    cs += m_cmd;

    LPTSTR lpsz = (LPTSTR)(LPCTSTR)cs;
    m_editoutput = "";
    UpdateData(FALSE);

    SECURITY_ATTRIBUTES sa;
    HANDLE hRead,hWrite;

    sa.nLength = sizeof(SECURITY_ATTRIBUTES);
    sa.lpSecurityDescriptor = NULL;
    sa.bInheritHandle = TRUE;
    if (!CreatePipe(&hRead,&hWrite,&sa,0))
    {
        MessageBox("Error on CreatePipe()!");
        return;
    }
   
    STARTUPINFO si;
    PROCESS_INFORMATION pi;
    si.cb = sizeof(STARTUPINFO);
    GetStartupInfo(&si);
    si.hStdError = hWrite;
    si.hStdOutput = hWrite;
    si.wShowWindow = SW_HIDE;
    si.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
    if (!CreateProcess(NULL,/*"c:\\windows\\system32\\cmd.exe /c ping google.com"*/lpsz,NULL,NULL,TRUE,NULL,NULL,NULL,&si,&pi))
    {
        MessageBox("Error on CreateProcess()!");
        return;
    }
    CloseHandle(hWrite);

    char buffer[4096];
    memset(buffer,0,4096);
    DWORD byteRead;
    while(true)
    {
        if (ReadFile(hRead,buffer,4095,&byteRead,NULL) == NULL)
        {
            break;
        }
        m_editoutput += buffer;
        UpdateData(FALSE);
        Sleep(200);
    }
}