Question

我在项目构建时遇到error: undefined reference to __imp__ZN12QApplicationC1ERiPPci'和error: undefined reference to __imp__ZN11QMainWindow11qt_metacastEPKc'等错误。我尝试过清洁和重建，但没有任何效果。

我已经看过很多关于此错误的帖子，但没有修复方法。我是Qt创建者的新手，所以我可能在这里遗漏了一些大事，但我制作了一个小部件项目。以下是文件：

的main.cpp

#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    return a.exec();
}

mainwindow.cpp

#include "mainwindow.h"
#include <QPushButton>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    setFixedSize(500,500);
    QPushButton myButton;
    myButton.setText("Hello world, this is a GUI app!!!");
}

MainWindow::~MainWindow()
{

}

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = 0);
    ~MainWindow();
};

#endif // MAINWINDOW_H

myWindow.pro

#-------------------------------------------------
#
# Project created by QtCreator 2018-03-11T19:52:19
#
#-------------------------------------------------

QT       += core gui


greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = myWindow
TEMPLATE = app

# The following define makes your compiler emit warnings if you use
# any feature of Qt which has been marked as 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 you use 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
QT += sql #added because I found this to try and solve my problem, doesn't fix

SOURCES += \
        main.cpp \
        mainwindow.cpp

HEADERS += \
        mainwindow.h

我的Qt版本5.10.1，操作系统是Windows，编译器是MinGW 64。

Answer 1

好的，我自己解决了这个问题，所以我在这里搞砸了两件事：

扩展QWidget而不是QMainWindow
（很简单）
检查我的工具包并使用正确版本的MinGW - 而不是64位或32位，它被称为完全不同的东西，但名称中仍然有MinGW;）

错误：对_imp _ ***的未定义引用

1 个答案: