Qt淺談之二十一log調試日誌
阿新 • • 發佈:2017-05-14
gms 生成文件 _file__ ica 沒有 rest delet mar 排除
一、簡單介紹
(2)本人思路有限,若有更好的設計建議。也可發郵件溝通,[email protected]
一、簡單介紹
近期因調試code時,想了解程序的流程,但苦於沒有一個簡易的日誌記錄,不停使用qDebug打印輸出,而終於提交代碼時得去多次刪除信息打印,有時還會出現新改動的代碼分不清是哪些部分。而使用#ifdef _DEBUG又比較煩這套,因此寫了些簡單的日誌,方便排除問題,臨時不能用於多線程中,以後須要再補充。
二、具體解釋
1、追蹤函數
#ifdef _DEBUG_PRINT #define DEBUGPRINT DEBUGInfo printinfo(__FILE__, __LINE__, __FUNCTION__); #else #define DEBUGPRINT #endif class DEBUGInfo { public: DEBUGInfo(QString file, int line, QString func); ~DEBUGInfo(); private: QString fileName; int fileLine; QString funcName; };
DEBUGInfo::DEBUGInfo(QString file, int line, QString func) :fileName(file) ,fileLine(line) ,funcName(func) { QString result = ""; QString beginTime = QDateTime::currentDateTime().toString("[yyyy-dd-MM hh:mm:ss.zzz] "); result += beginTime + "Enter:{" + fileName + ":" + QString::number(fileLine) + "---" + funcName + "}"; qDebug() << result.toStdString().c_str(); } DEBUGInfo::~DEBUGInfo() { QString result = ""; QString beginTime = QDateTime::currentDateTime().toString("[yyyy-dd-MM hh:mm:ss.zzz] "); result += beginTime + "Leave:{" + fileName + ":" + QString::number(fileLine) + "---" + funcName + "}"; qDebug() << result.toStdString().c_str(); }
使用:在須要查看的函數中增加DEBUGPRINT就可以。輸出文件名稱,所在的行和函數名字。
void HelloWorld() { DEBUGPRINT }
2、信息打印和寫日誌文件
enum LOGLEVEL{ LOG_DEBUG = 0, /**< Debug >**/ LOG_INFO, /**< Info >**/ LOG_WARN, /**< Warn >**/ LOG_ERROR /**< Error >**/ }; class LogWriter{ public: static LogWriter* getLogCenter(); void PrintLog(LOGLEVEL level, const char* msg, ...); void SaveFileLog(LOGLEVEL level, const char* msg, ...); void setLogPath(QString logPath); //defalut: current path void setLogLevel(LOGLEVEL logLevel); //defalut: LOG_DEBUG private: static LogWriter * _logCenter; explicit LogWriter(); ~LogWriter(); private: QString _logPath; LOGLEVEL _logLevel; private: QString getLevelStr(LOGLEVEL level); };
LogWriter *LogWriter::getLogCenter() { if (_logCenter == NULL) _logCenter = new LogWriter; return _logCenter; } LogWriter::LogWriter() { _logLevel = LOG_DEBUG; _logPath = QDir::currentPath(); } LogWriter::~LogWriter() { if (_logCenter) { delete _logCenter; _logCenter = NULL; } } void LogWriter::PrintLog(LOGLEVEL level, const char *msg, ...) { if (level < _logLevel) return; //low level char logBuffer[8192] = {0}; va_list vl_fmt; //buffer va_start(vl_fmt, msg); vsprintf(logBuffer, msg, vl_fmt); va_end(vl_fmt); QString fileTime = ""; QString logTime = ""; QString logLevel = getLevelStr(level); fileTime = QDateTime::currentDateTime().toString("yyyyddMM"); logTime = QDateTime::currentDateTime().toString("yyyy-dd-MM hh:mm:ss.zzz"); qDebug("[%s] [%s] {%s}", logTime.toStdString().c_str(), logLevel.toStdString().c_str(), logBuffer); } void LogWriter::SaveFileLog(LOGLEVEL level, const char *msg, ...) { if (level < _logLevel) return; //low level char logBuffer[8192] = {0}; va_list vl_fmt; //buff va_start(vl_fmt, msg); vsprintf(logBuffer, msg, vl_fmt); va_end(vl_fmt); QString logTime = ""; QString fileTime = ""; fileTime = QDateTime::currentDateTime().toString("yyyyddMM"); logTime = QDateTime::currentDateTime().toString("[yyyy-dd-MM hh:mm:ss.zzz]"); QString logLevel = getLevelStr(level); QString logFile = _logPath; if (logFile.right(1) != "/") { logFile += "/"; } QDir mDir(logFile); if (!mDir.exists()) { mDir.mkpath(logFile); } logFile += "isoft_"; logFile += fileTime; logFile += ".log"; QFile file(logFile); file.open(QIODevice::ReadWrite | QIODevice::Append | QIODevice::Text); QTextStream out(&file); out << logTime << " [" << logLevel << "] " << "{" << logBuffer << "}" << endl; file.close(); } QString LogWriter::getLevelStr(LOGLEVEL level) { switch(level) { case LOG_DEBUG: return "LOG_DEBUG"; break; case LOG_INFO: return "LOG_INFO"; break; case LOG_WARN: return "LOG_WARN"; break; case LOG_ERROR: return "LOG_ERROR"; break; } } void LogWriter::setLogPath(QString logPath) { _logPath = logPath; } void LogWriter::setLogLevel(LOGLEVEL logLevel) { _logLevel = logLevel; }能夠設置日誌的級別和日誌文件的路徑。
在函數中使用:
LogWriter::getLogCenter()->PrintLog(LOG_DEBUG, "hello world"); LogWriter::getLogCenter()->PrintLog(LOG_INFO, "%s:%s,%d", "hello", "world", 1234); LogWriter::getLogCenter()->SaveFileLog(LOG_WARN, "hello world"); LogWriter::getLogCenter()->SaveFileLog(LOG_ERROR, "%s:%s,%d", "hello", "world", 1234);
也會在當前路徑下生成文件。
3、Qt自帶樣例
Qt官方樣例:#include <qapplication.h> #include <stdio.h> #include <stdlib.h> void myMessageOutput(QtMsgType type, const char *msg) { switch (type) { case QtDebugMsg: fprintf(stderr, "Debug: %s\n", msg); break; case QtWarningMsg: fprintf(stderr, "Warning: %s\n", msg); break; case QtCriticalMsg: fprintf(stderr, "Critical: %s\n", msg); break; case QtFatalMsg: fprintf(stderr, "Fatal: %s\n", msg); abort(); } } int main(int argc, char **argv) { qInstallMsgHandler(myMessageOutput); QApplication app(argc, argv); ... return app.exec(); }自己定義改動:
void outputMessage(QtMsgType type, const char *msg) { static QMutex mutex; mutex.lock(); QString text; switch(type) { case QtDebugMsg: text = QString("Debug:"); break; case QtWarningMsg: text = QString("Warning:"); break; case QtCriticalMsg: text = QString("Critical:"); break; case QtFatalMsg: text = QString("Fatal:"); abort(); } QString message = QString("[%1] %2 %3").arg(QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss ddd")).arg(text).arg(msg); QFile file("log.txt"); file.open(QIODevice::WriteOnly | QIODevice::Append); QTextStream text_stream(&file); text_stream << message << endl; file.flush(); file.close(); mutex.unlock(); }
qInstallMsgHandler(outputMessage); qWarning("This is a warning message"); qCritical("This is a critical message"); //qInstallMsgHandler(0) //To restore the message handler, call執行結果:
三、總結
(1)本文僅僅是一個簡單的日誌記錄。還能夠設計成異步的多線程式的,甚至能夠增加到線程池,對性能要求較高的系統還得考慮文件的大小控制、存儲空間的控制、文件的級別控制、文件的日期控制和自己主動清除等操作。(2)本人思路有限,若有更好的設計建議。也可發郵件溝通,[email protected]
Qt淺談之二十一log調試日誌