WxWidgets 应用程序中的两个错误

Question

您好，我正在尝试创建一个 VNC 客户端。现在，我正在创建将用于查看远程用户屏幕的 GUI。这是到目前为止我的代码，我正在使用 WxWidgets 3.2.2

#include <wx/wx.h>
#include <wx/socket.h>
#include <iostream>

class MyApp : public wxApp
{
public:
    virtual bool OnInit();
};

class MyFrame : public wxFrame
{
public:
    MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);

    void OnConnect(wxCommandEvent& event);
    void OnExit(wxCommandEvent& event);
    void OnSocketEvent(wxSocketEvent& event);

private:
    wxSocketServer m_server;
    wxSocketBase* m_clientSocket;
    bool m_connectionReceived;

    wxDECLARE_EVENT_TABLE();
};

enum
{
    ID_CONNECT = 1,
    ID_EXIT
};

wxBEGIN_EVENT_TABLE(MyFrame, wxFrame)
EVT_MENU(ID_CONNECT, MyFrame::OnConnect)
EVT_MENU(ID_EXIT, MyFrame::OnExit)
EVT_SOCKET(wxID_ANY, MyFrame::OnSocketEvent)
wxEND_EVENT_TABLE()

bool MyApp::OnInit()
{
    MyFrame* frame = new MyFrame("wxWidgets Network App", wxPoint(50, 50), wxSize(800, 600));
    frame->Show(true);
    SetTopWindow(frame);
    return true;
}

MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
    : wxFrame(nullptr, wxID_ANY, title, pos, size),
    m_server(), // Initialize without specifying flags
    m_clientSocket(nullptr),
    m_connectionReceived(false)
{
    // Create a menu
    wxMenu* menuFile = new wxMenu;
    menuFile->Append(ID_CONNECT, "Connect", "Connect to the client");
    menuFile->Append(ID_EXIT, "Exit", "Exit the application");

    wxMenuBar* menuBar = new wxMenuBar;
    menuBar->Append(menuFile, "File");

    SetMenuBar(menuBar);

    CreateStatusBar();
    SetStatusText("Waiting for a connection...");

    if (!m_server.Ok()) {
        wxLogError("Failed to set up the server.");
    }

    if (!m_server.WaitForAccept(wxSOCKET_WAITALL, -1)) {
        wxLogError("Failed to wait for incoming connections.");
    }
}

void MyFrame::OnConnect(wxCommandEvent& event)
{
    if (!m_connectionReceived) {
        if (m_clientSocket) {
            m_connectionReceived = true;
            SetStatusText("Connection received.");
            SetTitle("CONNECTION RECEIVED");
        }
    }
}

void MyFrame::OnExit(wxCommandEvent& event)
{
    Close(true);
}

void MyFrame::OnSocketEvent(wxSocketEvent& event)
{
    if (event.GetSocket() == &m_server) {
        if (event.GetSocketEvent() == wxSOCKET_CONNECTION) {
            m_clientSocket = m_server.Accept();
            if (m_clientSocket) {
                m_connectionReceived = true;
                SetStatusText("Connection received.");
                SetTitle("CONNECTION RECEIVED");
            }
        }
    }
}

IMPLEMENT_APP(MyApp)

我收到以下错误：

Severity    Code    Description Project File    Line    Suppression State
Error (active)  E0289   no instance of constructor "wxSocketServer::wxSocketServer" matches the argument list   VNC_GUI_MAIN    C:\Users\User\source\repos\VNC_GUI_MAIN\main.cpp    50  

Severity    Code    Description Project File    Line    Suppression State
Error   C2512   'wxSocketServer::wxSocketServer': no appropriate default constructor available  VNC_GUI_MAIN    C:\Users\User\source\repos\VNC_GUI_MAIN\main.cpp    50  

我试图解决这个问题，但我一直没能成功构建它。

Answer 1

这里有什么问题的提示吗？您的服务器正在侦听哪个端口？代码中哪里指定的？

你正在像这样初始化wxSocketServer：

m_server(), // Initialize without specifying flags

快速的互联网搜索显示它有这样的构造函数：

wxSocketServer (const wxSockAddress &address, wxSocketFlags flags=wxSOCKET_NONE)

所以你必须指定一个包含端口的监听地址。

也许这就是你想要的：

• 将 m_server 声明为指针
• 在构造函数中手动初始化它，如下所示：

MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
    : wxFrame(nullptr, wxID_ANY, title, pos, size),
    m_server(nullptr),
    m_clientSocket(nullptr),
    m_connectionReceived(false)
{
    wxIPV4address addr;

    addr.AnyAddress();  // listen on all adapters

    unsigned short localListenPort = 64000; // listen on port 64000
    addr.Service(localListenPort);

    m_server = new wxSocketServer(localListenPort);

我认为更大的问题是，当您声明的目的是创建 VNC 客户端时，为什么需要构造服务器对象。除非 VNC 协议要求客户端接受返回的连接，否则可能不需要。