在Linux(Ubuntu 13.10和14.04）下运行Qt C++代码，而无需QtCoreApplication/Q

Running Qt C++ code without QtCoreApplication/QCoreApplication under Linux (Ubuntu 13.10 and 14.04)

本文关键字：代码 C++ Qt QtCoreApplication 运行 Ubuntu Linux      更新时间：2023-10-16

我在Linux下运行程序时遇到了一个奇怪的错误。消息说：QApplication：：qAppName：请先实例化QApplication对象。它在Windows 8下正常运行，但我想在没有此依赖项的情况下将其移植到Linux。这是我的代码：

#include <QtCore/QCoreApplication>
#include <iostream>
#include <omd/opto.h>
#include <QThread>
int main(int argc, char *argv[])
{
//QCoreApplication a(argc, argv);
OptoPorts ports;
OPort* list=ports.listPorts(true);
std::cout<<"Available ports:"<<std::endl;
std::cout<<std::endl;
int i=0;
for (i=0;i<ports.getLastSize();i++)
    std::cout<<"   "<<i+1<<". "<<list[i].name<<" "<<list[i].deviceName<<std::endl;
std::cout<<ports.getLastSize();
std::cout<<std::endl;
if (i==0)
    {
    std::cout<<"No sensor found"<<std::endl;
    return -1;
    }
        int input;
        int timing;
        if (ports.getLastSize()==1)
            input=1;
        else
            std::cin>>input;
        OptoDAQ daq;
        daq.open(list[input-1]);

        while (true)
        {
        if (daq.getVersion()!=_95)
        {
                    OptoPackage* pa=0;
                    int size=daq.readAll(pa);
                    for (int i=0;i<size;i++)
                    {
                    std::cout<<"x: "<<pa[i].x<<" y: "<<pa[i].y<<" z: "<<pa[i].z<<" s1: "<<pa[i].s1<<" s2: "<<pa[i].s2<<" s3: "<<pa[i].s3<<" s4: "<<pa[i].s4<<" TEMP: "<<pa[i].temp<<std::endl;
                    }
        }
        else if (daq.getVersion()==_95)
        {
        OptoPackage6D* p6d=0;
        int size=daq.readAll6D(p6d,false);
        std::cout<<"SIZE:"<<size<<std::endl;
        for (int i=0;i<size;i++)
        {
            std::cout<<"Sensor1.x: "<<p6d[i].Sensor1.x<<" Sensor1.y: "<<p6d[i].Sensor1.y<<" Sensor1.z: "<<p6d[i].Sensor1.z<<" Sensor1.s1: "<<p6d[i].Sensor1.s1<<" Sensor1.s2: "<<p6d[i].Sensor1.s2<<" Sensor1.s3: "<<p6d[i].Sensor1.s3<<"  Sensor1.s4: "<<p6d[i].Sensor1.s4<<" TEMP: "<<p6d[i].Sensor1.temp<<std::endl;
            std::cout<<"Sensor2.x: "<<p6d[i].Sensor2.x<<" Sensor2.y: "<<p6d[i].Sensor2.y<<" Sensor2.z: "<<p6d[i].Sensor2.z<<" Sensor2.s1: "<<p6d[i].Sensor2.s1<<" Sensor2.s2: "<<p6d[i].Sensor2.s2<<" Sensor2.s3: "<<p6d[i].Sensor2.s3<<"  Sensor2.s4: "<<p6d[i].Sensor2.s4<<" TEMP: "<<p6d[i].Sensor2.temp<<std::endl;
            std::cout<<"Sensor3.x: "<<p6d[i].Sensor3.x<<" Sensor3.y: "<<p6d[i].Sensor3.y<<" Sensor3.z: "<<p6d[i].Sensor3.z<<" Sensor3.s1: "<<p6d[i].Sensor3.s1<<" Sensor3.s2: "<<p6d[i].Sensor3.s2<<" Sensor3.s3: "<<p6d[i].Sensor3.s3<<"  Sensor3.s4: "<<p6d[i].Sensor3.s4<<" TEMP: "<<p6d[i].Sensor3.temp<<std::endl;
            std::cout<<"Sensor4.x: "<<p6d[i].Sensor4.x<<" Sensor4.y: "<<p6d[i].Sensor4.y<<" Sensor4.z: "<<p6d[i].Sensor4.z<<" Sensor4.s1: "<<p6d[i].Sensor4.s1<<" Sensor4.s2: "<<p6d[i].Sensor4.s2<<" Sensor4.s3: "<<p6d[i].Sensor4.s3<<"  Sensor4.s4: "<<p6d[i].Sensor4.s4<<" TEMP: "<<p6d[i].Sensor4.temp<<std::endl;
        }
        }
        QThread::msleep(50);
        }
        daq.close();

//return a.exec();
return 0;

}

如果你所做的只是QThread：：msleep，你不需要QCoreApplication。 我建议使用标准库进行睡眠，但如果您坚持，这在 Qt5 的 Windows 8.1 和 Ubuntu 15.04 中对我来说都很好用。

主.cpp：

#include <QThread>
int main()
{
    QThread::sleep(5);
    return 0;
}

使用 CMake 在两端进行配置，而无需更改任何内容：

CMakeLists.txt：

cmake_minimum_required(VERSION 2.8.11)
find_package(Qt5Core REQUIRED)
add_executable(main main.cpp)
qt5_use_modules(main Core)
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