Q136957: PC MAPI: How to Find a Currently Logged on User

Article: Q136957
Product(s): Microsoft Mail For PC Networks
Version(s): WINDOWS:3.0,3.2,3.5
Operating System(s): 
Keyword(s): 
Last Modified: 29-OCT-1999

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The information in this article applies to:

- Microsoft Mail for PC Networks, versions 3.0, 3.2, 3.5 
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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();

  long err;
  LHANDLE lhSession;

  MapiRecipDesc recip[1];
  lpMapiMessage FAR *lppMessage;
  lpMapiMessage lpMessage;
  char szSeedMessageID[512];
  char szMessageID[512];
  char szbuffer[80];

  LPSTR lpszSeedMessageID=&szSeedMessageID[0];
  LPSTR lpszMessageID=&szMessageID[0];

  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
  }

Additional query words: 3.00 3.20 3.20a 3.50

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Keywords          :  
Technology        : kbMailSearch kbZNotKeyword3 kbMailPCN320 kbMailPCN300 kbMailPCN350
Version           : WINDOWS:3.0,3.2,3.5

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