PC MAPI: How to Find a Currently Logged on User

The information in this article applies to:

• Microsoft Mail for PC Networks, versions 3.0, 3.2, and 3.5

SUMMARY

By using a Simple Messaging Application Programming Interface (MAPI) application, you can find a user that is currently logged on to Microsoft Mail. The following code illustrates one way that this can be done using Microsoft Visual C++ version 1.5 or any other C compiler.

MORE INFORMATION

NOTE: The following code implements MAPI.DLL as a static library.

/* WHOAMI.C  */

#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include <mapi.h>
#include <string.h>

int WhoAmI();

MapiRecipDesc recip[1]; lpMapiMessage FAR *lppMessage; lpMapiMessage lpMessage;

char szSeedMessageID[512];
char szMessageID[512];
char szbuffer[80];

MapiMessage note;

int main()

 WhoAmI();

 return(0);

int WhoAmI()

  char szMsg1[80];
  char szMsg2[80];

  recip[0].ulReserved = 0;
  recip[0].ulRecipClass = MAPI_TO;
  recip[0].lpszName = "Anybody";
  recip[0].lpszAddress = NULL;
  recip[0].ulEIDSize = 0;
  recip[0].lpEntryID = NULL;

  note.ulReserved = 0;
  note.lpszSubject = "WhoAmI message";
  note.lpszNoteText = "Test";
  note.lpszMessageType = "IPC.WhoAmI.Note";
  note.lpszDateReceived = NULL;
  note.lpszConversationID = NULL;
  note.flFlags = 0;
  note.lpOriginator = 0;
  note.nFileCount = 0;
  note.lpFiles = NULL;
  note.nRecipCount = 1;
  note.lpRecips = recip;

  strcpy(szMsg1, "Logged in user name:  ");
  strcpy(szMsg2, "Logged in user address:  ");

  /************  Logon  **********************/
  err = MAPILogon(0L, "", "", MAPI_LOGON_UI, 0L,
  &lhSession);
  if(err != SUCCESS_SUCCESS)
  {
     MessageBox(0, "Error logging on", "Error", MB_OK);
     return(0);
  }

  /*********** Save Message ******************/
  err = MAPISaveMail(lhSession, 0L, &note, 0L, 0L, "");
  if(err != SUCCESS_SUCCESS)
 {
    MessageBox(0, "Error saving message", "Error",
    MB_OK);
    err = MAPILogoff(lhSession, 0L, 0L, 0L);
    return(0);
  }

  /********* Find Message ********************/
  *lpszSeedMessageID = '\0';

  // reset MAPIFindNext back to the top again
  err = MAPIFindNext(lhSession, 0L, "IPC.WhoAmI.Note",
  lpszSeedMessageID, 0L, 0L, lpszMessageID);

  do
  {
    err = MAPIFindNext(lhSession, 0L, "IPC.WhoAmI.Note",
    lpszSeedMessageID, 0L, 0L, lpszMessageID);
    if(err != SUCCESS_SUCCESS)
    {
      MessageBox(0, "Error finding message", "Error",
      MB_OK);
      err = MAPILogoff(lhSession, 0L, 0L, 0L);
      return(0);
    }
    lppMessage=(lpMapiMessage FAR *) &lpMessage;

    /******** Read Message *************/
    err = MAPIReadMail(lhSession, 0L, lpszMessageID,
    MAPI_PEEK, 0L, lppMessage);
    if(err != SUCCESS_SUCCESS)
    {
      MessageBox(0, "Error during message read", "Error",
      MB_OK);
      err = MAPILogoff(lhSession, 0L, 0L, 0L);
      return(0);
    }

    /* copy the user data into the buffers */
    _fstrcpy(szbuffer, lpMessage->lpszMessageType);

    /* Message Types compare               */
    if(strcmp(szbuffer,"IPC.WhoAmI.Note") == 0)
    {
      _fstrcpy(szbuffer, lpMessage->lpOriginator->
      lpszName);
      strcat(szMsg1, szbuffer);
      MessageBox(0, szMsg1, "Currently logged in user",
      MB_OK);
      _fstrcpy(szbuffer, lpMessage->lpOriginator->
      lpszAddress);
      strcat(szMsg2, szbuffer);
      MessageBox(0, szMsg2, "Currently logged in user
      address", MB_OK);

    /* Delete the message since we are done with it */
      err = MAPIDeleteMail(lhSession, 0L, lpszMessageID,
      0L, 0L);
      if(err != SUCCESS_SUCCESS)
      {
        MessageBox(0, "Error deleting message", "Error",
        MB_OK);
      }

      err = MAPIFreeBuffer(lpMessage);
      if(err != SUCCESS_SUCCESS)
      {
        MessageBox(0, "Error freeing memory", "Error",
        MB_OK);
      }
      err = MAPILogoff(lhSession, 0L, 0L, 0L);
      return(0);
    }
    //if necessary, get next message ID.
    lstrcpy(lpszSeedMessageID, lpszMessageID);


  }while(err == SUCCESS_SUCCESS);


 /************** Logoff  ***************/
  err = MAPILogoff(lhSession, 0L, 0L, 0L);

  return(0);
 //End whoami function