I/O von Telnet

*JoE*

Hi ich möchte gerne über Pipes mit Telnet kommunizieren:

#include <cstdlib>
#include <iostream>
#include <windows.h> 
#include <stdio.h> 

using namespace std;

HANDLE hChildStdinRd, hChildStdinWr,  
   hChildStdoutRd, hChildStdoutWr;

int main(int argc, char *argv[])
{
    char IpApplicationName[1000];

    STARTUPINFO StartInfo;
    PROCESS_INFORMATION ProcessInfo;

    SECURITY_ATTRIBUTES saAttr; 

    saAttr.nLength = sizeof(SECURITY_ATTRIBUTES); 
    saAttr.bInheritHandle = TRUE; 
    saAttr.lpSecurityDescriptor = NULL; 

    strcpy(IpApplicationName, "c:\\windows\\system32\\telnet.exe");

    ZeroMemory(&StartInfo, sizeof(StartInfo));
    ZeroMemory( &ProcessInfo, sizeof(PROCESS_INFORMATION) );

    StartInfo.cb = sizeof(StartInfo);

    StartInfo.cb = sizeof(STARTUPINFO); 
    StartInfo.hStdError = hChildStdoutWr;
    StartInfo.hStdOutput = hChildStdoutWr;
    StartInfo.hStdInput = hChildStdinRd;
    //StartInfo.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
    //StartInfo.wShowWindow = SW_SHOW;

    if (! CreatePipe(&hChildStdoutRd, &hChildStdoutWr, &saAttr, 0)) 
       printf("Stdout pipe creation failed\n"); 

    if (! CreatePipe(&hChildStdinRd, &hChildStdinWr, &saAttr, 0)) 
       printf("Stdin pipe creation failed\n"); 

    if (!CreateProcess(IpApplicationName, NULL, NULL, NULL, TRUE, HIGH_PRIORITY_CLASS | CREATE_NEW_CONSOLE, NULL, NULL, &StartInfo, &ProcessInfo))

    CloseHandle(&ProcessInfo.hThread);
	CloseHandle(&ProcessInfo.hProcess);

    system("PAUSE");
    return EXIT_SUCCESS;
}

Sobald ich jedoch Telnet mit dem Flag STARTF_USESTDHANDLES starte, schliesst sich Telnet automatisch. Weshalb?

MfG Joe