1、#include "mainwindow.h"中

添加头文件：

#include <QProcess>

添加成员：

QProcess *myprocess;

 添加槽函数声明：

void showCMDResult();
void showCMDState(QProcess::ProcessState state);
void showCMDError();
void showCMDFinished(int exitCode, QProcess::ExitStatus exitStatus);

2、mainwindow.cpp中

构造函数中实例化：

myprocess = new QProcess;

添加槽函数：

connect(myprocess, SIGNAL(readyRead()), this, SLOT(showCMDResult()));
connect(myprocess, SIGNAL(stateChanged(QProcess::ProcessState)),this, SLOT(showState(QProcess::ProcessState)));
connect(myprocess, SIGNAL(error(QProcess::ProcessError)),this, SLOT(showCMDError()));
connect(myprocess, SIGNAL(finished(int,QProcess::ExitStatus)),this, SLOT(showCMDFinished(int, QProcess::ExitStatus)));

实现槽函数：

void MainWindow::showCMDResult()
{QString strTemp=QString::fromLocal8Bit(myprocess->readAll());ui->textEdit->append(strTemp);
}void MainWindow::showCMDState(QProcess::ProcessState state)
{if(state==QProcess::NotRunning)qDebug() << "Not Running";else if(state==QProcess::Starting) qDebug() << "Starting";;elseqDebug() << "Running";
}void MainWindow::showCMDError()
{ui->textEdit->append(myprocess->errorString());
}void MainWindow::showCMDFinished(int exitCode, QProcess::ExitStatus exitStatus)
{ui->textEdit->append(QString("启动结束：").append("退出代码：").append(QString::number(exitCode)).append("退出状态：").append(QString::number((uint)exitStatus)));
} 

     3、启动cmd.exe

QStringList argument;
argument<<"/C"<<"python"<<ui->lineEdit_filepath->text()<<ui->lineEdit_inputpara->text();
myprocess->start("cmd.exe",argument);
ui->textEdit->append("启动cmd.exe");
// 等待进程启动
if (!myprocess->waitForStarted())
{ui->textEdit->append("启动失败");return;
}