QT中调用外部程序：QProcess的使用

本文通过QProcess，实现了在Qt中调用外部程序（控制台程序），并将输出重定向到了一个QTextEdit里。效果如下图所示：

 

运行界面如下：

 

程序共包含以下三个文件：

 

//: main.cpp#include "process.h"#include <QApplication>#include <QTextCodec>int main(int argc, char *argv[]){ QApplication a(argc, argv); QTextCodec::setCodecForTr(QTextCodec::codecForLocale()); QTextCodec::setCodecForCStrings(QTextCodec::codecForLocale()); Process w; w.show(); return a.exec();} 

//: process.h#ifndef PROCESS_H#define PROCESS_H#include <QWidget>class QLabel;class QLineEdit;class QProcess;class QPushButton;class QTextEdit;class Process : public QWidget{ Q_OBJECTpublic: Process(QWidget *parent = 0, Qt::WFlags flags = 0); ~Process();private slots: void runClicked(); void readOutput();private: QProcess* cmd; QString output; QLabel* inputLabel; QLineEdit* inputEdit; QPushButton* runButton; QLabel* outputLabel; QTextEdit* outputEdit;};#endif // PROCESS_H 

//: process.cpp#include <QtGui>#include "process.h"Process::Process(QWidget *parent, Qt::WFlags flags) : QWidget(parent, flags){ inputLabel = new QLabel(tr("请输入命令：")); inputEdit = new QLineEdit; runButton = new QPushButton(tr("运行")); outputLabel = new QLabel(tr("运行结果如下：")); outputEdit = new QTextEdit; outputEdit->setReadOnly(true); QHBoxLayout* hlayout = new QHBoxLayout; hlayout->addWidget(inputEdit); hlayout->addWidget(runButton); QVBoxLayout* layout = new QVBoxLayout; layout->addWidget(inputLabel); layout->addLayout(hlayout); layout->addWidget(outputLabel); layout->addWidget(outputEdit); setLayout(layout); cmd = new QProcess; connect(inputEdit, SIGNAL(returnPressed()), this, SLOT(runClicked())); connect(runButton, SIGNAL(clicked(bool)), this, SLOT(runClicked())); connect(cmd, SIGNAL(readyRead()), this, SLOT(readOutput())); resize(500, 300);}Process::~Process(){}void Process::runClicked(){ QString input = inputEdit->text(); cmd->start(input); output = tr(""); outputEdit->setText(output);}void Process::readOutput(){ output += cmd->readAll(); outputEdit->setText(output);}