Question

我是一名C ++ - CLI初学者，我必须熟悉一些简单的事情。我做了一个带有1个标签和1个按钮的表格。我想通过单击按钮并通过另一个cpp类（changetext.cpp）中的void调用一些文本来更改标签的文本

结构：

Form1.h //只是一个常规表单代码，最后带有1个标签和1个按钮处理程序

#pragma once

namespace ms {

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
/// </summary>
public ref class Form1 : public System::Windows::Forms::Form
{
public:
    Form1(void)
    {
        InitializeComponent();
        //
        //TODO: Add the constructor code here
        //
    }

public:
    /// <summary>
    /// Clean up any resources being used.
    /// </summary>
    ~Form1()
    {
        if (components)
        {
            delete components;
        }
    }
public: System::Windows::Forms::Label^  label1;
private: System::Windows::Forms::Button^  button1;
public: 
public: 

public:
    /// <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->label1 = (gcnew System::Windows::Forms::Label());
        this->button1 = (gcnew System::Windows::Forms::Button());
        this->SuspendLayout();
        // 
        // label1
        // 
        this->label1->AutoSize = true;
        this->label1->Location = System::Drawing::Point(313, 140);
        this->label1->Name = L"label1";
        this->label1->Size = System::Drawing::Size(35, 13);
        this->label1->TabIndex = 0;
        this->label1->Text = L"label1";
        // 
        // button1
        // 
        this->button1->Location = System::Drawing::Point(101, 117);
        this->button1->Name = L"button1";
        this->button1->Size = System::Drawing::Size(100, 58);
        this->button1->TabIndex = 1;
        this->button1->Text = L"button1";
        this->button1->UseVisualStyleBackColor = true;
        this->button1->Click += gcnew System::EventHandler(this,               &Form1::button1_Click);
        // 
        // Form1
        // 
        this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
        this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
        this->ClientSize = System::Drawing::Size(467, 262);
        this->Controls->Add(this->button1);
        this->Controls->Add(this->label1);
        this->Name = L"Form1";
        this->Text = L"Form1";
        this->Load += gcnew System::EventHandler(this, &Form1::Form1_Load);
        this->ResumeLayout(false);
        this->PerformLayout();

    }
    #pragma endregion
public: System::Void Form1_Load(System::Object^  sender, System::EventArgs^  e) {


         }
private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {

             changetext my = new changetext();
             my.changeText();

         }
};
    }

ms.cpp（main）//只创建表单

// ms.cpp : main project file.

#include "stdafx.h"
#include "Form1.h"

using namespace ms;

[STAThreadAttribute]
int main(array<System::String ^> ^args)
{
// Enabling Windows XP visual effects before any controls are created
Application::EnableVisualStyles();
Application::SetCompatibleTextRenderingDefault(false); 

// Create the main window and run it
Application::Run(gcnew Form1());
return 0;
}

changetext.cpp

#include "stdafx.h"
#include "Form1.h"

int number;

void changeText()
{
number = 5;
Form1.label1->Text=number;

}

我在某个地方犯了一个小错误，我想它与头文件有关，我习惯用java编写代码，所以headerfiles不是我的一杯茶。

Answer 1

这是该怎么做：

在changetext.cpp中创建getter

#include "stdafx.h"
#include "Form1.h"

int number = 5;

void getNumber()
{
return number;
}

创建header.h

#pragma once
void getNumber();

包含header.h并编辑Form1.h

    #pragma once
#include header.h

namespace ms {

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
/// </summary>
public ref class Form1 : public System::Windows::Forms::Form
{
public:
    Form1(void)
    {
        InitializeComponent();
        //
        //TODO: Add the constructor code here
        //
    }

public:
    /// <summary>
    /// Clean up any resources being used.
    /// </summary>
    ~Form1()
    {
        if (components)
        {
            delete components;
        }
    }
public: System::Windows::Forms::Label^  label1;
private: System::Windows::Forms::Button^  button1;
public: 
public: 

public:
    /// <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->label1 = (gcnew System::Windows::Forms::Label());
        this->button1 = (gcnew System::Windows::Forms::Button());
        this->SuspendLayout();
        // 
        // label1
        // 
        this->label1->AutoSize = true;
        this->label1->Location = System::Drawing::Point(313, 140);
        this->label1->Name = L"label1";
        this->label1->Size = System::Drawing::Size(35, 13);
        this->label1->TabIndex = 0;
        this->label1->Text = L"label1";
        // 
        // button1
        // 
        this->button1->Location = System::Drawing::Point(101, 117);
        this->button1->Name = L"button1";
        this->button1->Size = System::Drawing::Size(100, 58);
        this->button1->TabIndex = 1;
        this->button1->Text = L"button1";
        this->button1->UseVisualStyleBackColor = true;
        this->button1->Click += gcnew System::EventHandler(this,&Form1::button1_Click); 
        // 
        // Form1
        // 
        this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
        this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
        this->ClientSize = System::Drawing::Size(467, 262);
        this->Controls->Add(this->button1);
        this->Controls->Add(this->label1);
        this->Name = L"Form1";
        this->Text = L"Form1";
        this->Load += gcnew System::EventHandler(this, &Form1::Form1_Load);
        this->ResumeLayout(false);
        this->PerformLayout();

    }
#pragma endregion
public: System::Void Form1_Load(System::Object^  sender, System::EventArgs^  e) {


         }
private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {

label1->Text=""+getNumber();

}
};
}

如何从'Form.h'外部更改文本标签？

1 个答案: