今天給大家介紹下QT里面的日志系統，直接上代碼
1 #include <QApplication> 2 #include <iostream> 3 #include "ThorHardwareUtil/PLC/plc.h" 4 #include "ThorHardwareUtil/crc.h" 5 #include "ThorHardwareUtil/Warehouse/baseshelf.h" 6 #include <QDebug> 7 #include "opendoorthread.h" 8 #include "TestProject/testform.h" 9 #include <QtMessageHandler> 10 #include <QFile> 11 #include <QDir> 12 #include <ThorUtil/confighelper.h> 13 #include <thread> 14 using namespace std; 15 //寫入信息到文件 16 void WriteLog(QString str, QString LogType) 17 { 18 19 QString fileFolder= qApp->applicationDirPath()+"/log/"+QDateTime::currentDateTime().toString("yyyy-MM-dd"); 20 QDir dir(fileFolder); 21 if(!dir.exists()) 22 { 23 dir.mkpath(fileFolder); 24 } 25 QString filePath=QString("%1/%2.log").arg(fileFolder).arg(LogType); 26 QString strToWrite="日志產生時間："+QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss"); 27 strToWrite.append(QString("\r\n日志消息：%1").arg(str)); 28 strToWrite.append("\r\n---------------------------------------------------------------------"); 29 QFile file(filePath); 30 file.open(QIODevice::WriteOnly | QIODevice::Append); 31 QTextStream text_stream(&file); 32 text_stream <<strToWrite<<"\r\n"; 33 file.flush(); 34 file.close(); 35 //打印到控制台 36 std::cout << strToWrite.toLocal8Bit().constData() << std::endl; 37 } 38 //注冊函數 39 void myMessageOutput(QtMsgType type, const QMessageLogContext &context, const QString &msg) 40 { 41 QString txtMessage = ""; 42 QString messageType = ""; 43 switch (type) { 44 case QtDebugMsg: //調試信息提示 45 messageType = "Debug"; 46 txtMessage = QString("Debug: %1 (%2:%3, %4)\n").arg(msg).arg(context.file).arg(QString::number(context.line)).arg(context.function); 47 break; 48 case QtInfoMsg: 49 messageType = "Info"; 50 txtMessage = QString("Warning: %1 (%2:%3, %4)\n").arg(msg).arg(context.file).arg(QString::number(context.line)).arg(context.function); 51 break; 52 case QtWarningMsg: //一般的warning提示 53 messageType = "Waring"; 54 txtMessage = QString("Warning: %1 (%2:%3, %4)\n").arg(msg).arg(context.file).arg(QString::number(context.line)).arg(context.function); 55 break; 56 case QtCriticalMsg: //嚴重錯誤提示 57 messageType = "Critical"; 58 txtMessage = QString("Critical: %1 (%2:%3, %4)\n").arg(msg).arg(context.file).arg(QString::number(context.line)).arg(context.function); 59 PostErrorMessage(txtMessage,messageType); 60 break; 61 case QtFatalMsg: //致命錯誤提示 62 messageType = "Fatal"; 63 txtMessage = QString("Fatal: %1 (%2:%3, %4)\n").arg(msg).arg(context.file).arg(QString::number(context.line)).arg(context.function); 64 abort(); 65 } 66 WriteLog(txtMessage, messageType); 67 } 68 int main(int argc, char *argv[]) 69 { 70 QApplication a(argc, argv); 71 //注冊監聽級別函數 72 qInstallMessageHandler(myMessageOutput); 73 74 qDebug() << "debug"; 75 76 77 return a.exec(); 78 }
這樣大家使用qDebug，qInfo，qCritical等打印信息就會分類輸出到日志文件里面，方便查看
注意：release模式下無法打印QMessageLogContext的具體內容，因為qt默認把release給取消了，需要在pro文件里面加上DEFINES += QT_MESSAGELOGCONTEXT