Qt 学习 第2节 日志输出和保存

重载 outputMessage （注意Qt4和Qt5有点不同）

#ifndef Qt_5

//===Qt4

DebuggerPrinter printer;

void outputMessage(QtMsgType type,const QMessageLogContext &context, QString &msg)

{

static QMutex mutex;

mutex.lock();

printer.printDebug(type, QString(msg));

mutex.unlock();

}

#else

//Qt5

void outputMessage(QtMsgType type,

const QMessageLogContext &context,

const QString &msg)

{

static QMutex mutex;

mutex.lock();

printer.printDebug(type, msg);

mutex.unlock();

}

#endif

void MainWindow::printDebug(int type, QString text)

{

switch (type) {

case QtDebugMsg:

//        this->ui->textBrowser->setTextColor(Qt::magenta);

this->ui->textBrowser->setTextColor(Qt::darkGreen);

break;

case QtWarningMsg:

this->ui->textBrowser->setTextColor(Qt::yellow);

break;

case QtCriticalMsg:

this->ui->textBrowser->setTextColor(Qt::red);

break;

case QtFatalMsg:

this->ui->textBrowser->setTextColor(Qt::darkRed);

break;

default:

break;

}

this->ui->textBrowser->append(QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss")

+ "：" +text);

}

void MainWindow::save_log()

{

QDir tmp;

if(!tmp.exists(QCoreApplication::applicationDirPath()+"/log"))

{

if(!tmp.mkdir(QCoreApplication::applicationDirPath()+"/log"))

{

QMessageBox::warning(this,tr("警告"),tr("创建目录log失败"),tr("确认"));

return;

}

}

QString file_path =QCoreApplication::applicationDirPath() + QString("/log/%1.txt").arg(QDateTime::currentDateTime().toString("yyyy-MM-dd hh-mm-ss"));

//    QString file_path = QString("log/log.txt");

QFile file(file_path);

if(!file.open(QIODevice::WriteOnly | QFile::Text))

{

qDebug()<<"open"<<file_path<<"失败";

return;

}else

{

QTextStream out(&file);

out<<this->ui->textBrowser->toPlainText()<<endl;

file.flush();

file.close();

this->ui->textBrowser->clear();

}

}

//===========大于一万行自动保存

void MainWindow::slot_auto_save_log()

{

if(this->ui->textBrowser->document()->blockCount() >= 10000)

{

save_log();

}

}

//===========退出自动保存

void MainWindow::on_action_clear_log_triggered()

{

save_log();

}