Error: undefined reference to _imp_***

Question

我在项目构建中遇到 error: undefined reference to __imp__ZN12QApplicationC1ERiPPci' 和 error: undefined reference to __imp__ZN11QMainWindow11qt_metacastEPKc' 之类的错误。我尝试过清理和重建，但没有任何效果。

我看过许多关于此错误的其他帖子，但没有修复方法有效。我是 Qt Creator 的新手，所以我可能在这里遗漏了一些重要的东西，但我做了一个小部件项目。以下是文件：

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版本是5.10.1，OS是Windows，编译器是MinGW 64。

Answer 1

好的，我自己修好了，下面是我搞砸的两件事：

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 - 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 ;)

Error: undefined reference to _imp_***

Error: undefined reference to _imp_***

c++

qt

linker-errors

mingw-w64