WPF调用带界面Qt Dll

参考博客：
https://blog.youkuaiyun.com/shuishanga/article/details/52183159
https://blog.youkuaiyun.com/zuoyefeng1990/article/details/70885220

 

0. 开发环境

Qt 5.9.0  Desktop Qt MSVC2015 64bit

VS2015 64bit

1. 思路

qt重写消息循环，自定义C接口，生成dll

dll可以用mfc和wpf调用

这里使用WPF实现qt dll调用

 

2. 项目说明

文档中两个项目

qtdll：qt库源码，项目在路径 qt-solutions-master\qtwinmigrate\examples\qtdll

WpfCallQtDialogDll：wpf程序

 

3. 核心代码

qtdll

实现了两个接口函数，add()和showDialog(HWND parent)

mainwindow是串口调试功能的界面，调用时会显示

showDialog使用时传入句柄

main.cpp

#include <qmfcapp.h>
#include <qwinwidget.h>
#include <QMessageBox>
#include <windows.h>

#include "mainwindow.h"

//  copy .\qtdialog.dll "D:\projects\2019\RobotControl20190304\WpfApplicationCallRobotDll\WpfA
//  pplicationCallRobotDll\bin\x64\Debug"


BOOL WINAPI DllMain( HINSTANCE hInstance, DWORD dwReason, LPVOID /*lpvReserved*/ )
{
    static bool ownApplication = FALSE;

    if ( dwReason == DLL_PROCESS_ATTACH )
        ownApplication = QMfcApp::pluginInstance( hInstance );
    if ( dwReason == DLL_PROCESS_DETACH && ownApplication )
        delete qApp;

    return TRUE;
}

QWinWidget *win;
MainWindow *mainWindow;
extern "C" __declspec(dllexport) bool showDialog( HWND parent )
{
    win = new QWinWidget(parent);
    win->showCentered();

    mainWindow = new MainWindow(win);
    mainWindow->setWindowFlags(mainWindow->windowFlags()& ~Qt::WindowMaximizeButtonHint | Qt::Dialog);
    mainWindow->show();

    // QMessageBox::about( win, "About QtMfc", "QtMfc Version 2.0\nCopyright (C) 2003" );

    return TRUE;
}

extern "C" __declspec(dllexport) bool destroyDialog()
{
    if(win != 0)
    {
        delete win;
        //delete serial;
    }

    return TRUE;
}

extern "C" __declspec(dllexport) int add(int a, int b)
{
    return a + b;
}

 

wpf

mainwindow.xaml.cs

using System;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Interop;

namespace WpfCallQtDialogDll
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        [DllImport("qtdialog.dll", CallingConvention = CallingConvention.Cdecl)]
        public static extern bool showDialog(IntPtr parent);

        [DllImport("qtdialog.dll", CallingConvention = CallingConvention.Cdecl)]
        public static extern int add(int a, int b);

        public MainWindow()
        {
            InitializeComponent();
        }

        private void btnShowDialog_Click(object sender, RoutedEventArgs e)
        {
            IntPtr hwnd = new WindowInteropHelper(this).Handle;

            showDialog(hwnd);
        }

        private void btnAdd_Click(object sender, RoutedEventArgs e)
        {
            int restult = add(1, 2);
        }
    }
}

4. 使用方法

qtdll编译生成的qtdialog.dll 

qt5dll(UI)\qtdll(UI)\qt-solutions-master\qtwinmigrate\examples\build-qtdll-Desktop_Qt_5_9_0_MSVC2015_64bit-Debug\debug\qtdialog.dll

拷贝到wpf

WpfCallQtDialogDll\WpfCallQtDialogDll\bin\x64\Debug\qtdialog.dll"

 

4. 运行效果