QT (纯C++)项目 ‘Qxxx‘ file not found 和 编译报错问题(已解决)_qt头文件file not found-CSDN博客

qInstallMessageHandler（指针函数参数） 需要静态指针，这个函数

#include <iostream>
#include "singleton.h"
#include "log4qt.h"
#include<QDebug>
using namespace std;
SingleTon* const SingleTon::p = new SingleTon;int main()
{
//    SingleTon* p1 = SingleTon::getSingleTon();
//    p1 -> printData("hello singleton");//    SingleTon* p2 = SingleTon::getSingleTon();
//    p2->printData(" hi singleton");//2024.07.10 logqInstallMessageHandler(Log4qt::myMessageHandler);qDebug()<<"This is a debug message.";return 0;
}

#ifndef LOG4QT_H
#define LOG4QT_H
#include <QFile>
#include <QTextStream>class Log4qt
{
public:Log4qt();static void myMessageHandler(QtMsgType type, const QMessageLogContext& context,const QString& msg);};#endif // LOG4QT_H

#include "log4qt.h"
Log4qt::Log4qt()
{}void Log4qt::myMessageHandler(QtMsgType type, const QMessageLogContext &context, const QString &msg)
{static QFile logFile("log.txt");if(!logFile.isOpen()){logFile.open(QIODevice::WriteOnly | QIODevice::Append);}QTextStream ts(&logFile);switch(type){case QtDebugMsg:ts<<"Debug: ";break;case QtInfoMsg:ts<<"Info: ";break;case QtWarningMsg:ts<<"Warning: ";break;case QtCriticalMsg:ts<<"Critical: ";break;case QtFatalMsg:ts<<"Fatal: ";abort();}ts<<context.file<<"("<<context.line<<"): "<<msg<<endl;
}