简单的编程问题C ++ [英] Simple programming question C++

问题描述

我是编程新手，所以请原谅我，英语不是我的第一语言。我正在学习CLR格式的C ++，所以我有以下内容：



test.h



宣布全球变量int x;

I am totally new to programming so please forgive me and english is not my first language. I am learning C++ in CLR format so I have the following:

test.h

Declared global variable int x;

private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) 
{   
x = 5;
test ( x ) 

}

private: System::Void button2_Click(System::Object^  sender, System::EventArgs^  e) 
{
       test(x) -> Still cannot access the variable x from button1.. :(
}

更新：在cpp中创建另一个函数，在test.h中调用它。 />

Update: Created another function in cpp, called it over here in test.h

Function int test ( int i)
{
int i;
return i;
}

推荐答案

确切地理解你想要的东西有点难，但我觉得它有点像这个;

It's a little bit difficult understanding exactly what you want, but I think it's something like this;

1. 按下按钮1时，将某个值存储在某个变量中。
2. 当按钮2为按下，以某种方式使用按下按钮1存储的值。

如果是这样的话可能有助于你开始;

If that's the case something like this might help you get started;

#include "stdafx.h"

#using <System.Windows.Forms.dll>

using namespace System;
using namespace System::Windows::Forms;

ref class MyForm : public Form {
private:
    Button^ button1;
    Button^ button2;
    Label^ label;
    int result;

public:
    MyForm();
    void OnClick1(System::Object ^sender, System::EventArgs ^e);
    void OnClick2(System::Object ^sender, System::EventArgs ^e);
};

// Constructor initializing the buttons and label, and adding them to the form
MyForm::MyForm() {
    Text = "My Form";

    button1 = gcnew Button();
    button1->Text = "Button 1 (add 1)";
    button1->SetBounds(10, 10, 100, 32);
    button1->Click += gcnew System::EventHandler(this, &MyForm::OnClick1);

    button2 = gcnew Button();
    button2->Text = "Button 2 (add 5)";
    button2->SetBounds(10, 50, 100, 32);
    button2->Click += gcnew System::EventHandler(this, &MyForm::OnClick2);

    label = gcnew Label();
    label->Text = "Result area";
    label->SetBounds(10, 90, 200, 32);

    Controls->Add(button1);
    Controls->Add(button2);
    Controls->Add(label);
}

// Click handler for button1, this will add 1 to the member variable result
void MyForm::OnClick1(System::Object ^sender, System::EventArgs ^e) {
    result += 1;
    label->Text = String::Format("Pressed 1, result is {0}", result);
}

// Click handler for button2, this will add 5 to the member variable result
void MyForm::OnClick2(System::Object ^sender, System::EventArgs ^e) {
    result += 5;
    label->Text = String::Format("Pressed 2, result is {0}", result);
}

int main(array<System::String ^> ^args) {
    MyForm^ form = gcnew MyForm();
    Application::Run(form);
    return 0;
}

MyForm 类保存按钮的变量，还有一个结果变量，该变量由类中的每个方法共享。因此，当按钮1或2修改该值时，另一个按钮的点击处理程序总是可以读取它。



希望这会有所帮助，

Fredrik

The MyForm class holds variables for the buttons, but also a result variable that is shared by every method in the class. Thus, when button 1 or 2 modifies the value, the click-handler for the other button can always read it.

Hope this helps,
Fredrik

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