将GMap封装为Activex供QT使用(工具:VS2017,QT5.12)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.InteropServices; //需手动添加的

namespace TestLibrary
{
    //以下代码可完全复制过去,不做任何改动,Guid 也不需要更改
    [ComImport, Guid("1D9AD540-F2C9-4368-8697-C4AAFCCE9C55")]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IObjectSafety
    {
        [PreserveSig]
        int GetInterfaceSafetyOptions(ref Guid riid, [MarshalAs(UnmanagedType.U4)] ref int pdwSupportedOptions, [MarshalAs(UnmanagedType.U4)] ref int pdwEnabledOptions);

        [PreserveSig()]
        int SetInterfaceSafetyOptions(ref Guid riid, [MarshalAs(UnmanagedType.U4)] int dwOptionSetMask, [MarshalAs(UnmanagedType.U4)] int dwEnabledOptions);

    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using GMap.NET.MapProviders;
using GMap.NET;
using System.Runtime.InteropServices;

namespace TestLibrary
{
    [Guid("0E32CE01-4D40-45A6-8B59-B39ABFE8ADB0")]
    public partial class MapLibrary: UserControl, IObjectSafety //接口类的引用
    {
        public MapLibrary()
        {
            InitializeComponent();
        }

        private void gMapControl1_Load(object sender, EventArgs e)
        {

            this.gMapControl1.CacheLocation = System.Windows.Forms.Application.StartupPath;//缓存文件路径
            this.gMapControl1.MapProvider = GMapProviders.BingHybridMap;
            this.gMapControl1.Manager.Mode = AccessMode.ServerAndCache;//地图模式为本地缓存,完全离线

            this.gMapControl1.ShowCenter = true;//隐藏或显示中心十字
            this.gMapControl1.MinZoom = 1;
            this.gMapControl1.MaxZoom = 23;
            this.gMapControl1.Zoom = 12;
            //this.gMapControl.ShowTileGridLines = false;//道路网格线
            this.gMapControl1.DragButton = System.Windows.Forms.MouseButtons.Left;//左健拖动地图
            this.gMapControl1.MouseWheelZoomType = MouseWheelZoomType.MousePositionWithoutCenter;//不以中心点缩放
            this.gMapControl1.Position = new PointLatLng(34.2313041, 108.8774211);
        }

        #region IObjectSafety //以下 到 #endregion 为添加的代码,不需要做任何修改
        private const string _IID_IDispatch = "{00020400-0000-0000-C000-000000000046}";
        private const string _IID_IDispatchEx = "{a6ef9860-c720-11d0-9337-00a0c90dcaa9}";
        private const string _IID_IPersistStorage = "{0000010A-0000-0000-C000-000000000046}";
        private const string _IID_IPersistStream = "{00000109-0000-0000-C000-000000000046}";
        private const string _IID_IPersistPropertyBag = "{37D84F60-42CB-11CE-8135-00AA004BB851}";

        private const int INTERFACESAFE_FOR_UNTRUSTED_CALLER = 0x00000001;
        private const int INTERFACESAFE_FOR_UNTRUSTED_DATA = 0x00000002;
        private const int S_OK = 0;
        private const int E_FAIL = unchecked((int)0x80004005);
        private const int E_NOINTERFACE = unchecked((int)0x80004002);

        private bool _fSafeForScripting = true;
        private bool _fSafeForInitializing = true;

        public int GetInterfaceSafetyOptions(ref Guid riid, ref int pdwSupportedOptions, ref int pdwEnabledOptions)
        {
            int Rslt = E_FAIL;

            string strGUID = riid.ToString("B");
            pdwSupportedOptions = INTERFACESAFE_FOR_UNTRUSTED_CALLER | INTERFACESAFE_FOR_UNTRUSTED_DATA;
            switch (strGUID)
            {
                case _IID_IDispatch:
                case _IID_IDispatchEx:
                    Rslt = S_OK;
                    pdwEnabledOptions = 0;
                    if (_fSafeForScripting == true)
                        pdwEnabledOptions = INTERFACESAFE_FOR_UNTRUSTED_CALLER;
                    break;
                case _IID_IPersistStorage:
                case _IID_IPersistStream:
                case _IID_IPersistPropertyBag:
                    Rslt = S_OK;
                    pdwEnabledOptions = 0;
                    if (_fSafeForInitializing == true)
                        pdwEnabledOptions = INTERFACESAFE_FOR_UNTRUSTED_DATA;
                    break;
                default:
                    Rslt = E_NOINTERFACE;
                    break;
            }

            return Rslt;
        }

        public int SetInterfaceSafetyOptions(ref Guid riid, int dwOptionSetMask, int dwEnabledOptions)
        {
            int Rslt = E_FAIL;
            string strGUID = riid.ToString("B");
            switch (strGUID)
            {
                case _IID_IDispatch:
                case _IID_IDispatchEx:
                    if (((dwEnabledOptions & dwOptionSetMask) == INTERFACESAFE_FOR_UNTRUSTED_CALLER) && (_fSafeForScripting == true))
                        Rslt = S_OK;
                    break;
                case _IID_IPersistStorage:
                case _IID_IPersistStream:
                case _IID_IPersistPropertyBag:
                    if (((dwEnabledOptions & dwOptionSetMask) == INTERFACESAFE_FOR_UNTRUSTED_DATA) && (_fSafeForInitializing == true))
                        Rslt = S_OK;
                    break;
                default:
                    Rslt = E_NOINTERFACE;
                    break;
            }

            return Rslt;
        }
        #endregion
       
    }


}

QT       += core gui axcontainer

#include <QAxWidget>

#include "MainWindow.h"
#include "ui_MainWindow.h"
#include <QAxWidget>  //activex控件头文件

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

    QAxWidget * axWidget = new QAxWidget(this);
    axWidget->setControl(QString::fromUtf8("{0E32CE01-4D40-45A6-8B59-B39ABFE8ADB0}"));//这里的guid 就是在gmap中生成添加的guid..同时在注册表中也可以看到
   // axWidget->resize(620,720);
    axWidget->show();
}

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