pvbrowser manual
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Chat

If you want a small chat mask within your visualization here is one.

Screenshot of pvbrowser chat
Screenshot of pvbrowser chat

You include a little bit from rllib.

/***************************************************************************
                          pvapp.h  -  description
                             -------------------
    begin                : Sa Aug 5 12:48:27 2006
    email                : lehrig@t-online.de
 ***************************************************************************/
#ifndef _PVAPP_H_
#define _PVAPP_H_

#include "processviewserver.h"
#include "rleventlogserver.h"
#include "rltime.h"
// todo: comment me out
//#include "rlmodbusclient.h"
//#include "rlsiemenstcpclient.h"
//#include "rlppiclient.h"
//#include "modbusdaemon.h"             // this is generated
//#include "siemensdaemon.h"            // this is generated
//#include "ppidaemon.h"                // this is generated
#define TAR_GZ  "/home/lehrig/pvbchat.tar.gz"
#define LOGFILE "/var/log/pvbchat.log"

int show_mask1(PARAM *p);

#endif
***************************************************************************
                          main.cpp  -  description
                             -------------------
    begin                : Sa Aug 5 12:48:27 2006
    email                : lehrig@t-online.de
 ***************************************************************************/
#include "pvapp.h"

rlEventLogServer eventLogServer(LOGFILE);

//<snip...........................>

The programming of the chat is done in the slots as follows.

//###############################################################
//# mask1_slots.h for ProcessViewServer created: Sat Aug 5 12:55:15 2006
//# please fill out these slots
//# here you find all possible events
//# Yours: Lehrig Software Engineering
//###############################################################

// todo: uncomment me if you want to use this data aquisiton
// also uncomment this classes in main.cpp and pvapp.h
// also remember to uncomment rllib in the project file
//extern rlModbusClient     modbus;
//extern rlSiemensTCPClient siemensTCP;
//extern rlPPIClient        ppi;

extern int num_threads;
extern rlEventLogServer eventLogServer;

typedef struct // (todo: define your data structure here)
{
  rlTime   time;
  int      num, num_threads;
  char     alias[80];
}
DATA;

static int slotInit(PARAM *p, DATA *d)
{
  if(p == NULL || d == NULL) return -1;
  //memset(d,0,sizeof(DATA));
  d->num = -1;
  d->num_threads = num_threads;
  strcpy(d->alias,"unknown");
  pvSetText(p,lineEditAlias,"unknown");
  pvSetEditable(p,textEditOutput,0);
  pvPrintf(p,textLabelNumThreads,"Num Users = %d",num_threads);
  pvSetFontColor(p,textEditOutput,0,255,0);
  return 0;
}

static int slotNullEvent(PARAM *p, DATA *d)
{
  if(p == NULL || d == NULL) return -1;
  const char *cptr;
  char buf[rlMAX_EVENT];

  if(num_threads != d->num_threads)
  {
    pvPrintf(p,textLabelNumThreads,"Num Users = %d",num_threads);
    d->num_threads = num_threads;
  }

  while(1)
  {
    cptr = eventLogServer.getEvent(buf,&d->num);
    if(cptr == NULL) break;
    if(strncmp(cptr,"alias=",6) == 0 && strstr(cptr,"::") != NULL)
    {
      pvBeep(p);
      if(strncmp(&cptr[6],d->alias,strlen(d->alias)) == 0)
      {
        pvSetFontColor(p,textEditOutput,0,0,255); // our message
      }
      else
      {
        pvSetFontColor(p,textEditOutput,255,0,0);
      }
      strcpy(buf,"From:"); buf[5] = ':';
      pvPrintf(p,textEditOutput,"%s",buf);
      pvSetFontColor(p,textEditOutput,0,255,0); // message from other user
      pvBeep(p);
    }
    else
    {
      pvPrintf(p,textEditOutput,"%s",cptr);
    }
  }
  return 0;
}

static int slotButtonEvent(PARAM *p, int id, DATA *d)
{
  if(p == NULL || id == 0 || d == NULL) return -1;
  if(id == pushButtonSend)
  {
    pvText(p,textEditInput); // request text
  }
  if(id == pushButtonDownload)
  {
    pvDownloadFile(p,TAR_GZ);
    pvMessageBox(p,-1,BoxInformation,"pvbchat.tar.gz downloaded\nto temp directory",1,0,0);
  }
  return 0;
}

static int slotTextEvent(PARAM *p, int id, DATA *d, const char *text)
{
  if(p == NULL || id == 0 || d == NULL || text == NULL) return -1;
  if(id == lineEditAlias)
  {
    if(strlen(text) < (int) (sizeof(d->alias)-1))
    {
      strcpy(d->alias,text);
    }
    else printf("text too long:%s\n",text);
  }
  return 0;
}

static int slotClipboardEvent(PARAM *p, int id, DATA *d, int val)
{
  if(p == NULL || id == 0 || d == NULL || val < -1000) return -1;
  if(id == textEditInput)
  {
    char buf[1024];
    char *cptr,*cptr_start;

    d->time.getLocalTime();
    sprintf(buf,"alias=%s::%s\n",d->alias,d->time.getTimeString());
    eventLogServer.putEvent(buf);
    cptr = p->clipboard;
    while(cptr != NULL)
    {
      cptr_start = cptr;
      cptr = strchr(cptr_start,'\n');
      if(cptr != NULL)
      {
        *cptr = '\0';
        cptr++;
      }
      if(strlen(cptr_start) > (int) (sizeof(buf)-1))
      {
        eventLogServer.putEvent("this line has been tooooo long\n");
      }
      else
      {
        strcpy(buf,cptr_start); strcat(buf,"\n");
        eventLogServer.putEvent(buf);
      }
    }
  }
  return 0;
}

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