log.cpp

#include "log.h"
#include <QDebug>

QFile *gFileLog = NULL;
QMessageLogger *gMLog = NULL;

const char *msgHead[] = {
    "Debug   ",
    "Warning ",
    "Critical",
    "Fatal   ",
    "Info    "
};

void myMessageOutput(QtMsgType type, const QMessageLogContext &context, const QString &msg)
{
    QByteArray localMsg = msg.toLocal8Bit();
    QString current_date_time = QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss:zzz ddd");

    if(gFileLog){
        QTextStream tWrite(gFileLog);

        QString msgText="%1 | %6 | %2:%3, %4 | %5\n";
        msgText = msgText.arg(msgHead[type]).arg(context.file).arg(context.line).arg(context.function).arg(localMsg.constData()).arg(current_date_time);
        //gFileLog->write(msgText.toLocal8Bit(), msgText.length());
        tWrite << msgText;
    }else{
        fprintf(stderr, "%s | %s | %s:%u, %s | %s\n", msgHead[type], current_date_time.toLocal8Bit().constData(), context.file, context.line, context.function, localMsg.constData());
    }

}

void logSysInit(QString filePath)
{
    QString current_date_time = QDateTime::currentDateTime().toString("yyyy-MM-dd");

    QString qDirPath = "/log";
    QDir dir;
    QString currentPath = dir.currentPath();
    qDirPath = currentPath + qDirPath;

    QDir logDir(qDirPath);
    if (!logDir.exists())
    {
        bool is_ok = logDir.mkdir(qDirPath);
        Q_ASSERT(is_ok);
    }

    filePath = qDirPath + "/" + filePath + "-" + current_date_time + ".txt";

    gFileLog = new QFile(filePath);
    if (!gFileLog->open(QIODevice::WriteOnly | QIODevice::Text | QIODevice::Append)){
        return;
    }
//初始化自定义日志处理函数myMessageOutput
    qInstallMessageHandler(myMessageOutput);
//gMLog 这个类不要也可以，执行的时候只能看一下效果。
    gMLog = new QMessageLogger(__FILE__, __LINE__, Q_FUNC_INFO);
}

void logSysInit()
{
    qInstallMessageHandler(myMessageOutput);

    gMLog = new QMessageLogger(__FILE__, __LINE__, Q_FUNC_INFO);
}