Question

我正在启动一个名为Nice System Monitor的项目，旨在监控Linux上的进程，并且我在QtCreator中使用C ++和Qt。

我已经开始使用一个名为QTableWidget的函数来重复填充QThread但是即使我在重新填充之前删除了每一行，表也没有正确更新。

我对Qt很陌生，并在互联网上激发了我自己的不同来源。

这里是QThread的代码：

#include <unistd.h>
#include <ios>
#include <iostream>
#include <fstream>
#include <string>
#include <dirent.h>
#include <stdio.h>
#include <cctype>
#include <stdlib.h>
#include <vector>
#include <sstream>
#include "renderprocesstablethread.h"
#include <proc/readproc.h>
#include <proc/procps.h>
#include "mainwindow.h"
using namespace std;


RenderProcessTableThread::RenderProcessTableThread(QObject *parent)
    : QThread(parent)
{
    restart = false;
    abort = false;
}

RenderProcessTableThread::~RenderProcessTableThread()
{
    mutex.lock();
    abort = true;
    condition.wakeOne();
    mutex.unlock();

    wait();
}

bool RenderProcessTableThread::isNum(char *s) {
    int i = 0,  flag;

    while(s[i]){
            //if there is a letter in a string then string is not a number
        if(isalpha(s[i]) || s[i] == '.'){
            flag = 0;
            break;
        }
        else flag = 1;
        i++;
        }
    if (flag == 1) return true;
    else return false;
}

string RenderProcessTableThread::convertDouble(double value) {
  std::ostringstream o;
  if (!(o << value))
    return "";
  return o.str();
}

string RenderProcessTableThread::convertInt(int value) {
  std::ostringstream o;
  if (!(o << value))
    return "";
  return o.str();
}



void RenderProcessTableThread::run()
{
    forever {
        mutex.lock();
        mutex.unlock();
        fillProcessTable();
        sleep(1000);
        //cout << "ça marche" << endl;
    }
    mutex.lock();
    if (!restart)
        condition.wait(&mutex);
    restart = false;
    mutex.unlock();

}


void RenderProcessTableThread::setLocalMainWindow(MainWindow& w)
{
    localMainWindow = &w;
    ui_tableWidgetProcessus = localMainWindow->findChild<QTableWidget*>("tableWidgetProcessus");
    ui_tableWidgetProcessus->setColumnCount(11);
    ui_tableWidgetProcessus->setColumnWidth(10,508);
    QFont fnt;
    fnt.setPointSize(10);
    fnt.setFamily("Arial");
    ui_tableWidgetProcessus->setFont(fnt);
    QStringList labels;
    labels << "user" << "pid" << "cpu" << "nice" << "vsz" << "rss" << "tty" << "stat" << "start" << "time" << "cmd";
    ui_tableWidgetProcessus->setHorizontalHeaderLabels(labels);
}


void RenderProcessTableThread::fillProcessTable() {

    QMutexLocker locker(&mutex);

    if (!isRunning()) {
        start(LowPriority);
    } else {
        restart = true;
        condition.wakeOne();
    }

    PROCTAB* proc = openproc(PROC_FILLUSR | PROC_FILLMEM | PROC_FILLSTAT | PROC_FILLSTATUS | PROC_FILLARG);
    proc_t proc_info;

    memset(&proc_info, 0, sizeof(proc_info));

    int totalRow = ui_tableWidgetProcessus->rowCount();
    for ( int i = 0; i < totalRow ; ++i )
    {
           ui_tableWidgetProcessus->removeRow(i);
    }

    int i = 0;
    while (readproc(proc, &proc_info) != NULL) {
      cout << proc_info.fuser << proc_info.tid << proc_info.cmd << proc_info.resident << proc_info.utime << proc_info.stime << endl;
      ui_tableWidgetProcessus->setRowCount(i+1);
      ui_tableWidgetProcessus->setItem(i,0,new QTableWidgetItem(QString(proc_info.fuser),0));
      ui_tableWidgetProcessus->setItem(i,1,new QTableWidgetItem(QString((char*)convertInt(proc_info.tid).c_str()),0));
      ui_tableWidgetProcessus->setItem(i,2,new QTableWidgetItem(QString((char*)convertInt(proc_info.pcpu).c_str()),0));
      ui_tableWidgetProcessus->setItem(i,3,new QTableWidgetItem(QString((char*)convertInt(proc_info.nice).c_str()),0));
      ui_tableWidgetProcessus->setItem(i,4,new QTableWidgetItem(QString((char*)convertInt(proc_info.vm_size).c_str()),0));
      ui_tableWidgetProcessus->setItem(i,5,new QTableWidgetItem(QString((char*)convertInt(proc_info.rss).c_str()),0));
      ui_tableWidgetProcessus->setItem(i,6,new QTableWidgetItem(QString((char*)convertInt(proc_info.tty).c_str()),0));
      ui_tableWidgetProcessus->setItem(i,7,new QTableWidgetItem(QString(proc_info.state),0));
      ui_tableWidgetProcessus->setItem(i,8,new QTableWidgetItem(QString((char*)convertInt(proc_info.start_time).c_str()),0));
      ui_tableWidgetProcessus->setItem(i,9,new QTableWidgetItem(QString((char*)convertInt(proc_info.stime).c_str()),0));

      //cout << "proc_info.tid : " << proc_info.tid << endl;
      //cout << "proc_info.cmdline : " << proc_info.cmdline << endl;

      string text;
      if (proc_info.cmdline != 0) {
        vector<string> v(proc_info.cmdline, proc_info.cmdline + sizeof(proc_info.cmdline) / sizeof(string));
        text = v[0];
      }
      else {
        vector<string> v;
        v.push_back(proc_info.cmd);
        text = v[0];
      }
      //string text = char_to_string(proc_info.cmdline);

      ui_tableWidgetProcessus->setItem(i,10,new QTableWidgetItem(QString((char*)text.c_str()),0));
      i++;
    }

    closeproc(proc);

}

他们是更好的方法吗？

由于

帕特里克

Answer 1

对于Qt＆＃39; Signal and Slots来说，这看起来很像。在你的情况下，线程会发出信号，并且会调用窗口中的一个插槽。

所以在你的RenderProcessTableThread.h中定义一个信号

signals:
void newValues(const QString &data);

在你的mainwindow.h中

public slots:
void showNewValues(const QString &data);

在此广告位中将数据添加到您的表格中。然后你必须连接它们（例如在创建线程后在主窗口的构造函数中）

connect(yourThread, SIGNAL(newValues(QString)), this, SLOT(showNewValues(QString)));

每当您想要显示新数据时，发出信号（例如，fillProcessTable()函数中的某个地方）：

emit newValues(yourValues);

Qt为你做了线程之间的连接。

想要在QThread中更新QtableWidget

1 个答案: