int a=0x1234;

QT输出 2进制

qDebug() << QString("%1").arg(a , 0, 2);

QT输出 16进制

qDebug() << "data:" << hex << a;  //输出16进制原型
qDebug() << QString("%1").arg(a , 0, 16).toUpper();   //输出16进制大写

QT输出 10进制

qDebug() << "data:" << a;

QT自定义调试信息输出

#define qWiFiDebug(format, ...) qDebug("[Output]: "format" [File]:%s, [Line]:%d, [Function]:%s", ##__VA_ARGS__, __FILE__, __LINE__ , __FUNCTION__);

int main()
{
	qWiFiDebug("hello");
}

//输出：
[Output]: hello [File]:..\mainwindow.cpp, [Line]:68[Function]:MainWindow::on_pushButton_clicked

QT日志输出函数

#include <QMutex>
#include <QString>
#include <QDir>
#include <QFile>
#include <QTextStream>
#include <QDateTime>

QMutex LogLock;
/*
type:  日志文件名
content：  日志内容
*/
int WriteLog(QString type, QString content)
{
    LogLock.lock();

    QDateTime currentTime = QDateTime::currentDateTime();

    QString time = currentTime.toString("yyyy-MM-dd hh:mm:ss");
    QString date= currentTime.toString("yyyyMMdd");
    QString month = date.mid(4, 2);
    QString year=date.mid(0, 4);
    QString day = date.mid(6, 2);

    QString path="Logs/"+ year + "/" + month+"/" + day + "/";

    QString fileName = path + type + "_"+date + ".log";
    QString data = "[" + time + "]" + " " + content;

    QDir dir;
    if (! (dir.exists(path)))
        dir.mkpath(path);

    QFile f(fileName);
    f.open(QIODevice::WriteOnly|QIODevice::Append) ;
    QTextStream t(&f);
    t << data<< endl;
    f.close();

    LogLock.unlock();
    return 0;
}