Qt中使用main函数中的参数

相关资料：

http://www.myexceptions.net/qt/295891.html

https://download.csdn.net/download/zhujianqiangqq/19569564    代码包下载

实例：

.pro

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += 
    main.cpp 
    mainwindow.cpp 
    typeobject.cpp

HEADERS += 
    mainwindow.h 
    typeobject.h

FORMS += 
    mainwindow.ui

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

main.cpp

#include "mainwindow.h"

#include <QApplication>
#include <QDebug>

#include "typeobject.h"

int main(int argc, char *argv[])
{
    qDebug() << "argc:" <<argc;
    for(int i=0; i<argc; i++)
        qDebug() << "argv:" << argv[i];
    c_ss = argv[1];
    qDebug() << "c_ss:" << c_ss;

    QString sName = QString(c_ss);
    qDebug() << "sName:" << sName;
    qDebug() << "sName:" << sName;

    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QDebug>



QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private slots:
    void on_pushButton_clicked();

private:
    Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

#include "typeobject.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    setWindowTitle("main argc argv");
}

MainWindow::~MainWindow()
{
    delete ui;
}


void MainWindow::on_pushButton_clicked()
{
    qDebug() << "c_ss:" << c_ss;
}

typeobject.h

#ifndef TYPEOBJECT_H
#define TYPEOBJECT_H

#include <QString>

extern QString c_ss;

#endif // TYPEOBJECT_H

typeobject.cpp

#include "typeobject.h"

QString c_ss="";

 PS:参数用的是Qtcreator调时传入的。方法：“项目”-“Run”-"Command line arguments:"-输入"ASD"。