Question

在提出问题之前，我想告诉我，我已经在这里彻底搜索了答案。他们似乎都没有解决我的问题。问题：在给出on the Qt wiki后面的步骤后，我使用Qt创建了一个简单的C ++ DLL文件，问题是虽然创建了DLL并且我已将其链接到我的Qt小部件应用程序，但应用程序在创建文件对象时崩溃。这里我发布了源代码和qdebug输出

libraray Qt pro

QT       += core gui widgets

TARGET = myLib
TEMPLATE = lib

DEFINES += MYLIB_LIBRARY

DEFINES += QT_DEPRECATED_WARNINGS

SOURCES += \
        mylib.cpp

HEADERS += \
        mylib.h \
        mylib_global.h 

unix {
    target.path = /usr/lib
    INSTALLS += target
}

mylib.h

#ifndef MYLIB_H
#define MYLIB_H

#include "mylib_global.h"

class MYLIBSHARED_EXPORT MyLib
{

public:
   MyLib();

   int add(int x, int y);
   int sub(int x, int y);

};

#endif // MYLIB_H

mylib_global.h

#ifndef MYLIB_GLOBAL_H
#define MYLIB_GLOBAL_H
#include <QtCore/qglobal.h>
#if defined(MYLIB_LIBRARY)
#  define MYLIBSHARED_EXPORT Q_DECL_EXPORT
#else
#  define MYLIBSHARED_EXPORT Q_DECL_IMPORT
#endif
#endif // MYLIB_GLOBAL_H

mylib.cpp

#include "mylib.h"
#include<QDebug>

MyLib::MyLib()
{
}

int MyLib::add(int x, int y)
{
    qDebug()<<"Adding";
    return x+y;
}

int MyLib::sub(int x, int y)
{
   return x-y;
}

现在的应用

myWidgetApp.pro

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = myWidgetApp
TEMPLATE = app
DEFINES += QT_DEPRECATED_WARNINGS
SOURCES += \
    main.cpp \
    mainwindow.cpp
HEADERS += \
    mainwindow.h

FORMS += \
    mainwindow.ui
INCLUDEPATH += "D:\Gurushant\My Other Side Projects\Making dll Files\myLib"

LIBS += "D:\Gurushant\My Other Side Projects\Making dll Files\build-myLib-Desktop_Qt_5_9_1_MinGW_32bit-Release\release\myLib.dll"

mainwindow.cpp

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

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    MyLib lib;
    lib.add(1,2); 
}

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

现在应用程序输出 D:\Gurushant\My Other Side Projects\Making dll Files\build-myWidgetApp-Desktop_Qt_5_9_1_MinGW_32bit-Release\release\myWidgetApp.exe崩溃了。

我使用的是Windows 7 Professional和Qt 5.9.1

Answer 1

在做了大量试验和错误之后，包含该库的最佳方法是

INCLUDEPATH += (Your_Path)
DEPENDPATH += (Your Path)

(if your target path is win32)
win32:CONFIG(release, debug|release): LIBS += -L(path) -l(lib_file_without_dot_dll)

在-L

Qt应用程序崩溃与使用Qt制作的DLL链接

1 个答案: