好久没写博客了，最近工作需要，研究了一下下面这些功能：

1：把qDebug信息打印到QT 窗口

2：把qDebug信息保存到本地

3：执行shell脚本

4：把终端信息输出到QT窗口

先上代码：

#include "logbrowser.h"

#include

#include

#include

QPointer log_broswer;

void myMessageOutput(QtMsgType type,const char *msg)

{

if(log_broswer)

log_broswer->outputMessage(type,msg);

}

int main(int argc,char *argv[])

{

QApplication a(argc,argv);

log_broswer = new LogBrowser;

log_broswer->show();

qInstallMsgHandler(myMessageOutput);

int result = a.exec();

delete log_broswer;

return result;

}

#ifndef LOGBROWSER_H

#define LOGBROWSER_H

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

namespace Ui {

class LogBrowser;

}

class LogBrowser : public QWidget

{

Q_OBJECT

public:

explicit LogBrowser(QWidget *parent = 0);

~LogBrowser();

void outputMessage(QtMsgType type,const QString &msg);

public slots:

void start();

void save(bool enable);

void directoryUpdated(const QString &path); // 目录更新时调用，path是监控的路径

private slots:

void on_pushButton_start_clicked();

void on_pushButton_stop_clicked();

void on_pushButton_save_clicked();

void on_pushButton_exit_clicked();

void autoUpdata();

void on_pushButton_updata_clicked();

void displayUdiskFileList();

void readCmdInformation();

private:

Ui::LogBrowser *ui;

QTextBrowser *browser;

QPushButton *start_button;

QPushButton *clear_button;

QProcess *my_process;

QFileSystemWatcher *my_sysWatcher;

QTimer *my_timer;

bool is_finished;

bool my_saveEnable;

};

#endif // LOGBROWSER_H

#include "logbrowser.h"

#include "ui_logbrowser.h"

LogBrowser::LogBrowser(QWidget *parent) :

QWidget(parent),ui(new Ui::LogBrowser)

{

ui->setupUi(this);

//背景透明

setAutoFillBackground(false);

setWindowFlags(Qt::FramelessWindowHint);

setAttribute(Qt::WA_TranslucentBackground,true);

my_timer = new QTimer();

my_process = new QProcess(); //执行命令的进程

//当有输出时，发出消息。接收槽会读取进程管道内的数据

connect(my_process,SIGNAL(readyRead()),this,SLOT(readCmdInformation()));

my_sysWatcher = new QFileSystemWatcher();

my_sysWatcher->addPath("/mnt"); //监控文件夹路径

//如果文件夹有变动，则发出通知

connect( my_sysWatcher,SIGNAL(directoryChanged(QString)),SLOT(directoryUpdated(QString)));

ui->pushButton_updata->setEnabled(false);

is_finished = false;

my_saveEnable = false;

}

LogBrowser::~LogBrowser()

{

delete ui;

}

//! 读取命令窗口的信息，显示在自己的窗口上

void LogBrowser::readCmdInformation()

{

QString str = my_process->readAllStandardOutput();

ui->plainTextEdit->appendPlainText( str );

ui->plainTextEdit->moveCursor(QTextCursor::End);

}

//!接收debug 底层信息

void LogBrowser::outputMessage(QtMsgType type,const QString &msg)

{

QString message;

switch(type)

{

case QtDebugMsg:

message = QString("Debug:");

break;

case QtWarningMsg:

message = QString("Warning:");

break;

case QtCriticalMsg:

message = QString("Critical:");

break;

case QtFatalMsg:

message = QString("Fatal:");

break;

}

ui->plainTextEdit->appendPlainText(message.append(msg) );

ui->plainTextEdit->moveCursor(QTextCursor::End); //滑动条移动到底端

if( my_saveEnable )

{

QFile file("log.txt");

file.open(QIODevice::WriteOnly | QIODevice::Append);

QTextStream text_stream(&file);

text_stream << message << "\r\n";

file.flush();

file.close();

}

}

//一个测试函数，正常使用时，可以删除

void LogBrowser::start()

{

for(int i=0; i<1000000; i++)

{

if(!is_finished)

{

QCoreApplication::processEvents();

qDebug()<

}else{

return;

}

}

}

//!打开保存开关，则所有DEBUG信息保存到log.txt文件中

void LogBrowser::save(bool enable)

{

my_saveEnable = enable;

}

//! 自动升级，也就是自动执行脚本。

void LogBrowser::autoUpdata()

{

ui->plainTextEdit->appendPlainText("Auto UpData start!!!\r\n" );

my_process->start("/mnt/sda1/auto.sh");

// my_process->start("/home/lbs_work/test.sh");

}

//! 当有U盘插入时，则读取文件目录，并打开更新

void LogBrowser::directoryUpdated(const QString &path)

{

const QDir dir(path);

QStringList newEntryList = dir.entryList(QDir::NoDotAndDotDot | QDir::AllDirs | QDir::Files,QDir::DirsFirst);

if( newEntryList.contains("sda1"))

{

ui->plainTextEdit->setPlainText("U disk has been mounted");

emit my_timer->singleShot(2000,SLOT(displayUdiskFileList()));

ui->pushButton_updata->setEnabled( true );

}else{

ui->plainTextEdit->setPlainText("U disk has been unmounted");

ui->pushButton_updata->setEnabled(false);

}

}

//! 显示U盘文件夹目录，这里需要延时，因为刚挂载U盘，马上读取是读不到任何东西的

void LogBrowser::displayUdiskFileList()

{

const QDir udir("/mnt/sda1");

QStringList uDiskList = udir.entryList(QDir::NoDotAndDotDot | QDir::AllDirs | QDir::Files,QDir::DirsFirst);

ui->plainTextEdit->appendPlainText(QString().setNum(uDiskList.length()));

for( int i = 0; i < uDiskList.length(); ++i )

{

ui->plainTextEdit->appendPlainText( uDiskList[i] );

}

}

void LogBrowser::on_pushButton_start_clicked()

{

is_finished = false;

this->start();

}

void LogBrowser::on_pushButton_stop_clicked()

{

is_finished = true;

}

void LogBrowser::on_pushButton_save_clicked()

{

this->save(true);

}

void LogBrowser::on_pushButton_exit_clicked()

{

this->close();

delete this; //这是重点

}

void LogBrowser::on_pushButton_updata_clicked()

{

this->autoUpdata();

}

一定要注意类与类之间的层次关系。