Question

我正在制作一个使用线程的Windows窗体应用程序，线程正在运行并且它可以工作，但我希望我的线程能够访问表单组件。就像在线程函数中看不到的BtnMain一样。我怎么解决这个问题？这是我的代码

#pragma once

namespace winAppSocket {
struct struttura{
char c;
int num;
} mystruct;

UINT  ServerThread(LPVOID pParam)
{
printf("Starting up TCP server\r\n");
SOCKET server;
WSADATA wsaData;
sockaddr_in local;
int wsaret=WSAStartup(0x101,&wsaData);
if(wsaret!=0)
{
    return 0;
}
local.sin_family=AF_INET;
local.sin_addr.S_un.S_addr=INADDR_ANY;
local.sin_port=htons((u_short)20248);
server=socket(AF_INET,SOCK_STREAM,0);
if(server==INVALID_SOCKET)
{
    return 0;
}
if(bind(server,(sockaddr*)&local,sizeof(local))!=0)
{
    return 0;
}
if(listen(server,10)!=0)
{
    return 0;
}
SOCKET client;
sockaddr_in from;
int fromlen=sizeof(from);
int buffer;
char buff;
while(true)
{
    client=accept(server,(struct sockaddr*)&from,&fromlen);
    //printf("pppp\n");
    //con la struct
    int numByte=recv(client,(char*) &mystruct, (int) sizeof(mystruct), 0);

    //printf("%c\t%d\n", mystruct.c, mystruct.num);
    //ricevere un char funziona
    //int numByte=recv(client, &buff, (int) sizeof(buff), 0);
    //printf("%c\t%d\n", buff, numByte);
    //int numByte=recv(client, buffer, (int) strlen(buffer), 0);
    //questo funziona
    //int numByte=recv(client, (char*)&buffer, (int) sizeof(buffer), 0);
    //printf("%d\t%d\n", buffer, numByte);
    //printf("Connection from %s\n", inet_ntoa(from.sin_addr));
    closesocket(client);

}
closesocket(server);
WSACleanup();
return 0;
}

using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;


/// <summary>
/// Summary for Form1
///
/// WARNING: If you change the name of this class, you will need to change the
///          'Resource File Name' property for the managed resource compiler tool
///          associated with all .resx files this class depends on.  Otherwise,
///          the designers will not be able to interact properly with localized
///          resources associated with this form.
/// </summary>
public ref class Form1 : public System::Windows::Forms::Form
{
public:
    Form1(void)
    {
        InitializeComponent();
        //
        //TODO: Add the constructor code here
        //
    }

protected:
    /// <summary>
    /// Clean up any resources being used.
    /// </summary>
    ~Form1()
    {
        if (components)
        {
            delete components;
        }
    }
public: System::Windows::Forms::Button^  BtnMain;

protected: 

private:
    /// <summary>
    /// Required designer variable.
    /// </summary>
    System::ComponentModel::Container ^components;

#pragma region Windows Form Designer generated code
    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    void InitializeComponent(void)
    {
        this->BtnMain = (gcnew System::Windows::Forms::Button());
        this->SuspendLayout();
        // 
        // BtnMain
        // 
        this->BtnMain->Location = System::Drawing::Point(139, 21);
        this->BtnMain->Name = L"BtnMain";
        this->BtnMain->Size = System::Drawing::Size(120, 36);
        this->BtnMain->TabIndex = 0;
        this->BtnMain->Text = L"Start Main";
        this->BtnMain->UseVisualStyleBackColor = true;
        this->BtnMain->Click += gcnew System::EventHandler(this,   &Form1::BtnMain_Click);
        // 
        // Form1
        // 
        this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
        this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
        this->ClientSize = System::Drawing::Size(284, 262);
        this->Controls->Add(this->BtnMain);
        this->Name = L"Form1";
        this->Text = L"Package Analyzer";
        this->ResumeLayout(false);

    }

#pragma endregion
private: System::Void BtnMain_Click(System::Object^  sender, System::EventArgs^  e) {
AfxBeginThread(ServerThread,0);
//while(_getch()!=27);
}
};
}

Answer 1

为什么在使用托管C ++时不使用.NET线程？使事情变得更容易......但是，当您从另一个线程访问控件时，您将获得异常 - 您必须使用Invoke来更新线程中的控件。

修改
好吧，我只能写C＃，但我相信你可以轻松地将它转换为C ++：

private void BtnMain_Click(object sender, EventArgs e) { Thread t = new Thread(new ThreadStart(ThreadMethod)); t.Start(); } private void ThreadMethod(object state) { // state would be set if you used ParameterizedThreadStart and t.Start(...) above // DO YOUR STUFF HERE ... // Set text of label on form. You must use this.Invoke, as otherwise // you'll run into an exception for changing controls from a different thread this.Invoke((Action)delegate() { label1.Text = "Hello"; }); }

但是在你的情况下甚至不需要这样做 - 使用.NET TCP类！

您应避免使用非托管代码进行混合管理，而应学会使用框架的功能。

我的线程没有看到Windows窗体组件

1 个答案: