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C ++ / Eclipse未定义的参考问题(C++ / Eclipse undefined reference question)

 我在Eclipse / C ++中遇到了显然是链接器错误（“未定义的引用”）的问题。 下面显示的所有类都可以很好地编译，除了一个PlayGame.cpp，它给出了“未定义引用”错误（下面还显示）。  
 以下是相关的类和代码段。  
 PlayerFactory.h  
 PlayerFactory.cpp  
 Game.h  
 Game.cpp  
// constructor for game:

Game::Game (const PlayerFactory& factory)

{

       cout << " constructor" << endl;

}
 
 PlayGame.cpp  
// start of code for game where error occurs

#include "Game.h"

#include "PlayerFactory.h"

int main() {
   try

   {

      PlayerFactory factory;

      Game game (factory);  <== undefined reference error
      ...
 
 上面的代码给出错误“未定义的引用'Game（PlayerFactory const＆）'”  
 什么导致这个错误，以及如何纠正？ 

I'm having trouble with what is apparently a linker error ("undefined reference") in Eclipse / C++. All the classes shown below compile fine, except for one, PlayGame.cpp, which is giving the "undefined reference" error (also shown below).  
Below are the relevant classes and pieces of code.  
PlayerFactory.h 
PlayerFactory.cpp  
Game.h 
Game.cpp 
// constructor for game:

Game::Game (const PlayerFactory& factory)

{

       cout << " constructor" << endl;

}
 
PlayGame.cpp 
// start of code for game where error occurs

#include "Game.h"

#include "PlayerFactory.h"

int main() {
   try

   {

      PlayerFactory factory;

      Game game (factory);  <== undefined reference error
      ...
 
The above line gives the error "undefined reference to `Game(PlayerFactory const&)'" 
What's causing this error, and how can it be corrected? 

原文：https://stackoverflow.com/questions/763573

更新时间：2023-10-11 22:10

最满意答案

 您可以尝试使用NodeMouseClick事件，它使用TreeNodeClickEventArgs来获取按钮和单击的节点。  
private void treeView1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
{
    if(e.Button == MouseButtons.Right)
        MessageBox.Show(e.Node.Name);
}
 
 
 修改代码以显示弹出窗口并创建窗体  
public partial class Form1 : Form
{
    string clickedNode;
    MenuItem myMenuItem = new MenuItem("Show Me");
    ContextMenu mnu = new ContextMenu();
    public Form1()
    {
        InitializeComponent();
        mnu.MenuItems.Add(myMenuItem);
        myMenuItem.Click += new EventHandler(myMenuItem_Click);
    }

    void myMenuItem_Click(object sender, EventArgs e)
    {
        Form frm = new Form();
        frm.Text = clickedNode;
        frm.ShowDialog(this);
        clickedNode = "";
    }

    private void treeView1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
    {
        if (e.Button == MouseButtons.Right)
        {
            clickedNode = e.Node.Name;
            mnu.Show(treeView1,e.Location);
        }
    }
}

You can try using the NodeMouseClick Event it uses the TreeNodeClickEventArgs to get the Button and the Node that was clicked. 
private void treeView1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
{
    if(e.Button == MouseButtons.Right)
        MessageBox.Show(e.Node.Name);
}
 
 
Modified Code to show Popup and created Form 
public partial class Form1 : Form
{
    string clickedNode;
    MenuItem myMenuItem = new MenuItem("Show Me");
    ContextMenu mnu = new ContextMenu();
    public Form1()
    {
        InitializeComponent();
        mnu.MenuItems.Add(myMenuItem);
        myMenuItem.Click += new EventHandler(myMenuItem_Click);
    }

    void myMenuItem_Click(object sender, EventArgs e)
    {
        Form frm = new Form();
        frm.Text = clickedNode;
        frm.ShowDialog(this);
        clickedNode = "";
    }

    private void treeView1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
    {
        if (e.Button == MouseButtons.Right)
        {
            clickedNode = e.Node.Name;
            mnu.Show(treeView1,e.Location);
        }
    }
}

C ++ / Eclipse未定义的参考问题(C++ / Eclipse undefined reference question)

最满意答案

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