Knowledge Base Nr: 00073 Get_IP_from_RAS_sample.cpp - http://www.swe-kaiser.de

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Win32: Get the current IP address(es) from an existing Remote Access Connection

  
#include <ras.h>

BOOL GetIPfromRAS(CString& strIP)
{
  strIP = "<not connected>";

  RASPPPIP proj_buf;          // points to buffer that receives
                // projection information
  DWORD cb;                   // points to variable that specifies
                // buffer size
  RASCONN rasconn[1];  // buffer to receive connections data
  DWORD cConnections;

  cb = sizeof(rasconn);
  rasconn[0].dwSize = cb;

  DWORD ret = RasEnumConnections(
            &rasconn[0],  // buffer to receive connections data
            &cb,         // size in bytes of buffer
            &cConnections); // number of connections written to buffer

  if (ret == 0)
  {
    for (int n=0; n<cConnections; n++)
    {
      cb = sizeof(proj_buf);
      proj_buf.dwSize = cb;
      if (!RasGetProjectionInfo(rasconn[n].hrasconn, RASP_PppIp, (LPVOID)&proj_buf, &cb))
      {
        strIP += proj_buf.szIpAddress;
        if (n<cConnections-1) //suppress trailing space
          strIP += " / ";
      }
    }

    return (cConnections > 0);
  }
  else
  {
    char szErrorString[200];  // buffer to hold error string
    RasGetErrorString(ret,        // error to get string for
              &szErrorString[0],  // buffer to hold error string
              sizeof(szErrorString));           // size, in characters, of buffer
    strIP.Format("RAS error: %s\n", szErrorString);
    fprintf(stderr, strIP);
  }

  return FALSE;
}


...
  CString strIP;
  BOOL bSucc = GetIPfromRAS(strIP);
  ASSERT(bSucc);
...