QDebug 数据重定向

#include "MyDebug.h" #include <QMutex> #include <iostream> #include <QDateTime> #include <QCoreApplication> #include <QFile> #include <QDir> #include <QTextStream> //接收调试信息的函数 void outputMessage(QtMsgType type, const QMessageLogContext &context, const QString &msg) { static QMutex mutex; QMutexLocker lock(&mutex); QString text; switch(type) { //如果是debug信息，那么直接打印至应用程序输出，然后退出本函数 case QtDebugMsg: std::cout << msg.toStdString() << std::endl; return ; //如果是警告，则继续执行后面的数据处理 case QtWarningMsg: text = QString("Warning..............................."); break; case QtCriticalMsg: text = QString("Critical.............................."); break; case QtFatalMsg: text = QString("Fatal................................."); break; default: text = QString("Default..............................."); break; } //获取单例 MyDebug *instance = MyDebug::Instance(); //消息输出位置 QString context_info = QString("File: %1\r\nFunc: %2\r\nLine: %3") .arg(QString(context.file)) .arg(QString(context.function)) .arg(context.line); //消息打印时间 QString current_date_time = QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss ddd"); QString current_date = QString("Time: %1") .arg(current_date_time); //调试信息 QString message = QString("%1\r\n%2\r\n%3\r\n%4") .arg(text) .arg(current_date) .arg(context_info) .arg("MSG : "+msg); //log 位置 QString logPahtHtml = "<a href = \"%1\">Click here to open the log directory.</a>\r\n"; logPahtHtml = logPahtHtml.arg(QCoreApplication::applicationDirPath()+"/"+instance->logPath()); //将调试信息格式化成 html 格式， QString msgHtml = msg; msgHtml.replace(" ", "&nbsp;"); msgHtml.remove("\r"); msgHtml.replace("\n", "<br>"); msgHtml = QString("<font color=red>" + msgHtml + "</font>"); QString contextInfoHtml = context_info; contextInfoHtml.remove("\r"); contextInfoHtml.replace("\n", "<br>"); //格式化后的调试信息 QString messageHtml = QString("%1<br>%2<br>%3<br>%4<br>%5") .arg(text) .arg(logPahtHtml) .arg(current_date) .arg(contextInfoHtml) .arg("MSG : "+msgHtml); //将调试信息写入文件 QFile file(instance->logPath() + instance->logName()); file.open(QIODevice::WriteOnly | QIODevice::Append); QTextStream text_stream(&file); text_stream << message << "\r\n\r\n\r\n"; file.flush(); file.close(); //将处理好的调试信息发送出去 instance->sigDebugStrData(message); //将处理成 html 的调试信息发送出去 instance->sigDebugHtmlData(messageHtml); //检查文件是否达到了指定大小 if(file.size() < 1024*1024) { return ; } //log达到了限制值则将名字更改，防止文件越来越大 for(int loop = 1; loop < 100; ++loop) { QString fileName = QString("%1/log_%2.txt").arg(instance->logPath()).arg(loop); QFile file_1(fileName); if(file_1.size() < 4) { file.rename(fileName); return ; } } } //MyDebug单例 MyDebug* MyDebug::self = nullptr; MyDebug* MyDebug::Instance() { if(!self) { QMutex muter; QMutexLocker clocker(&muter); if(!self) { self = new MyDebug(); } } return self; } //安装消息器 void MyDebug::installMessageHandler() { qInstallMessageHandler(outputMessage); } //卸载消息器 void MyDebug::uninstallMessageHandler() { qInstallMessageHandler(0); } //建立文件路径 QString MyDebug::logPath() { QString current_date_file_name = QDateTime::currentDateTime().toString("yyyy-MM-dd"); QDir dir(QString("log/%1").arg(current_date_file_name)); if(!dir.exists()) { dir.mkpath("./"); } return dir.path() + "/" ; } QString MyDebug::logName() { return "log.txt"; } MyDebug::MyDebug(QObject *parent) : QObject(parent) { static MyDebug::GC gc; } MyDebug::~MyDebug() { std::cout << "~MyDebug" << std::endl; } //垃圾自动回收 MyDebug::GC::~GC() { if (self != nullptr) { delete self; self = nullptr; } }