编译器错误“collect2：Id返回1退出状态”使用带有QObject的类（带Qt Creator的QT 4.7）

问题描述 投票：1回答：3

我在当前项目中遇到以下情况：编译器使用以下代码返回“collect2：Id返回1退出状态”：

#ifndef BASE_02_H
#define BASE_02_H

#include <QtCore>

class Base_02
{

public:
    Base_02();

    virtual void method()=0;
};

#endif // BASE_02_H

#include "base_02.h"
#include <QtCore>

Base_02::Base_02()
{

}

//----------------------------------------------------------------------------------------------------------------------------------

#ifndef DERIVED_02_H
#define DERIVED_02_H

#include <QtCore>
#include "base_02.h"

class Derived_02 : public Base_02
{

public:
    Derived_02();
    void method();
};

#endif // DERIVED_02_H

#include "derived_02.h"
#include <QtCore>

Derived_02::Derived_02()
{

}

void Derived_02::method()
{
    qDebug() << "Derived_02::method()";
}

//----------------------------------------------------------------------------------------------------------------------------------

#ifndef BASE_H
#define BASE_H

#include <QtCore>

class Base : public QObject
{
    Q_OBJECT

public:
    Base(Base* p=NULL);

    virtual void method()=0;
};

#endif // BASE_H

#include "base.h"
#include <QtCore>

Base::Base(Base* p)
{

}

//----------------------------------------------------------------------------------------------------------------------------------

#ifndef DERIVED_H
#define DERIVED_H

#include <QtCore>
#include "base.h"

class Derived : public Base
{
    Q_OBJECT

public:
    Derived(Derived* p=NULL);
    void method();
};

#endif // DERIVED_H

#include "derived.h"
#include "derived_02.h"
#include <QtCore>

Derived::Derived(Derived* p)
{

}

void Derived::method()
{
    Derived_02 d;
    d.method();
}

//----------------------------------------------------------------------------------------------------------------------------------

#include <QtCore/QCoreApplication>
#include <QtCore>
#include "base.h"
#include "derived.h"

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);



    Derived* derived = new Derived();



    return a.exec();
}

编译器说如下：

... mingw32-make：输入目录C:/Entwicklung SVN/debug test/dataSenderReceiverExample' C:/Qt/2010.04/mingw/bin/mingw32-make -f Makefile.Debug mingw32-make[1]: Entering directoryC：/ Entwicklung SVN / debug test / dataSenderReceiverExample'g ++ -c -g -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_CORE_LIB -DQT_THREAD_SUPPORT -I“.... .. \ Qt \ 2010.04 \ qt \ include \ QtCore“-I”...... \ Qt \ 2010.04 \ qt \ include“-I”.. \ dataSenderReceiver“-I”...... \ Qt \ 2010.04 \ qt \ include \ ActiveQt“-I”debug“-I”...... \ Qt \ 2010.04 \ qt \ mkspecs \ win32-g ++“-o debug \ main.o main.cpp main.cpp：在函数'int main（int，char **）'中：main.cpp：14：警告：未使用的变量'derived'g ++ -enable-stdcall-fixup -Wl，-enable-auto-import -Wl，-enable-runtime -pseudo-reloc -Wl，-subsystem，console -mthreads -Wl -o debug \ dataSenderReceiverExample.exe debug / main.o -L“c：\ Qt \ 2010.04 \ qt \ lib”-L ../ dataSenderReceiver / debug - ldataSenderReceiver -lQtCored4 mingw32-make [1]：离开目录C:/Entwicklung SVN/debug test/dataSenderReceiverExample' mingw32-make: Leaving directoryC：/ Entwicklung SVN / debug test / dataSenderReceiverExample'../ dataSenderReceiver/debug/libdataSenderReceiver.a(derived.o):C:\Entwicklung SVN \ debug test \ dataSend erReceiver / derived.cpp：14：未定义引用Derived_02::Derived_02()' ../dataSenderReceiver/debug/libdataSenderReceiver.a(derived.o):C:\Entwicklung SVN\debug test\dataSenderReceiver/derived.cpp:15: undefined reference toDerived_02 :: method（）'collect2：ld返回1退出状态mingw32-make [1]：* [debug \ dataSenderReceiverExample.exe]错误1 mingw32-make：* [debug]错误2 Prozess“C：/Qt/2010.04/mingw/bin/mingw32-make.exe”wurde mitdemRückgabewert％2 wasdet。 Fehler beim Erstellen des Projekts dataSenderReceiverExample（Ziel：Desktop）BeimAusführendesBuild-Schritts'Make'

请帮忙！

c++ qt virtual derived qobject
3个回答
1
投票
#include "base_02.h"
#include <QtCore>

必须：

#include <QtCore>
#include "base_02.h"

然后编译！

1
投票

我在以下情况下遇到此问题：

说

A是可执行（f.i.控制台）项目，B和C是库（f.i.静态库）项目，A使用B和B使用C.

然后

A必须通过.pro文件知道B库和C库，B必须通过.pro文件知道C库。

说

在.pro文件库C中，在库B之前表示：

LIBS *= -L"../C/debug"
LIBS *= -lC
INCLUDEPATH *= "../C"

LIBS *= -L"../B/debug"
LIBS *= -lB
INCLUDEPATH *= "../B"

然后

确切地说，上述错误确实存在。

解：

A .pro文件中库C之前的名称库B：

LIBS *= -L"../B/debug"
LIBS *= -lB
INCLUDEPATH *= "../B"

LIBS *= -L"../C/debug"
LIBS *= -lC
INCLUDEPATH *= "../C"
0
投票
I got same problem here...??
#include<iostream>
using namespace std;
class employee{
    protected:
        int id; 
        string name;
        int day;
        int salary;
    public:
        virtual void calsalary()=0;
};
class facultyemp:public employee{
    public:
        static int k;
        facultyemp(){
            k++;
            id=k;
        }
        void setname(){
            cout<<"Enter name:";
            cin>>name;
        }
        void setday(){
            cout<<"Enter worked days:";
            cin>>day;
        }
        void setsalary(){
            cout<<"Enter salary pr day:";
            cin>>salary;
        }
        void getname(){
            cout<<"Name: "<<name;
        }
        void getid(){
            cout<<"\nID: "<<id;
        }
        void calsalary(){
            cout<<"The net salary: ";
            cout<<day*salary;
        }

};
static int k=0;
int main(){
    employee *e;
    facultyemp f;
    e=&f;
    f.setname();
    f.setday();
    f.setsalary();
    f.getname();
    f.getid();
    e->calsalary();

}
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