无法通过构造函数将Windows窗体传递给另一个窗体
我想通过构造函数将Form1传递给Form2，但它无法正常工作，我想这是我身边的愚蠢，但我无法弄清楚出了什么问题。我很感激这里的一些帮助。
这是Form1包含一个richtextbox和一个按钮，它打开第二个Form。
#pragma once
#include "Form2.h"
namespace passForm {
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: System::Windows::Forms::RichTextBox^ richTextBox1;
public: System::Windows::Forms::Button^ open_form2_button;
Form1(void)
{
InitializeComponent();
//
//TODO: Add the constructor code here
//
}
protected:
/// <summary>
/// Clean up any resources being used.
/// </summary>
~Form1()
{
if (components)
{
delete components;
}
}
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->richTextBox1 = (gcnew System::Windows::Forms::RichTextBox());
this->open_form2_button = (gcnew System::Windows::Forms::Button());
this->SuspendLayout();
//
// richTextBox1
//
this->richTextBox1->Location = System::Drawing::Point(12, 12);
this->richTextBox1->Name = L"richTextBox1";
this->richTextBox1->Size = System::Drawing::Size(100, 96);
this->richTextBox1->TabIndex = 0;
this->richTextBox1->Text = L"";
//
// open_form2_button
//
this->open_form2_button->Location = System::Drawing::Point(159, 47);
this->open_form2_button->Name = L"open_form2_button";
this->open_form2_button->Size = System::Drawing::Size(89, 23);
this->open_form2_button->TabIndex = 1;
this->open_form2_button->Text = L"Open Form 2";
this->open_form2_button->UseVisualStyleBackColor = true;
this->open_form2_button->Click += gcnew System::EventHandler(this, &Form1::open_form2_button_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->open_form2_button);
this->Controls->Add(this->richTextBox1);
this->Name = L"Form1";
this->Text = L"Form1";
this->ResumeLayout(false);
}
#pragma endregion
private: System::Void open_form2_button_Click(System::Object^ sender, System::EventArgs^ e) {
Form^ rgForm = gcnew Form2(this);
rgForm->Show();
//this->Hide();
}
};
}
这是带有问题的构造函数的Form2
#pragma once
using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;
namespace passForm {
/// <summary>
/// Summary for Form2
///
/// 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 Form2 : public System::Windows::Forms::Form
{
private: System::Windows::Forms::Form ^ otherform;
public:
Form2()
{
InitializeComponent();
//
//TODO: Add the constructor code here
//
}
public:
Form2(System::Windows::Forms::Form ^ frm1)
{
InitializeComponent();
//
//TODO: Add the constructor code here
//
otherform = frm1; // this assignment is not working
}
private: System::Windows::Forms::Button^ btnShowResults;
public:
protected:
/// <summary>
/// Clean up any resources being used.
/// </summary>
~Form2()
{
if (components)
{
delete components;
}
}
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->btnShowResults = (gcnew System::Windows::Forms::Button());
this->SuspendLayout();
//
// btnShowResults
//
this->btnShowResults->Location = System::Drawing::Point(88, 108);
this->btnShowResults->Name = L"btnShowResults";
this->btnShowResults->Size = System::Drawing::Size(99, 23);
this->btnShowResults->TabIndex = 0;
this->btnShowResults->Text = L"Show Results";
this->btnShowResults->UseVisualStyleBackColor = true;
this->btnShowResults->Click += gcnew System::EventHandler(this, &Form2::btnShowResults_Click);
//
// Form2
//
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->btnShowResults);
this->Name = L"Form2";
this->Text = L"Form2";
this->Load += gcnew System::EventHandler(this, &Form2::Form2_Load);
this->ResumeLayout(false);
}
#pragma endregion
private: System::Void Form2_Load(System::Object^ sender, System::EventArgs^ e) {
}
private: System::Void btnShowResults_Click(System::Object^ sender, System::EventArgs^ e) {
otherform->richTextBox1->AppendText("Hello\n"); //richTextBox1 is not recognized
}
};
}
请注意以下部分
Form1.h
private：System :: Void open_form2_button_Click（System :: Object ^ sender，System :: EventArgs ^ e）{
Form^ rgForm = gcnew Form2(this);
rgForm->Show();
//this->Hide();
}
和Form2.h
private：System :: Windows :: Forms :: Form ^ otherform;
public:
Form2()
{
InitializeComponent();
//
//TODO: Add the constructor code here
//
}
public:
Form2(System::Windows::Forms::Form ^ frm1)
{
InitializeComponent();
//
//TODO: Add the constructor code here
//
otherform = frm1; // this assignment is not working
}
我猜这些部分会产生错误。
请注意，当我传递给构造函数时，只有RichTxtBox对象一切正常。
3 个答案:
答案 0 :(得分：0)
让我试着猜测：
我确定作业有效，但是你这样做了：
otherform->richTextBox1->AppendText("Hello\n");
这不会起作用，因为System::Windows::Forms::Form没有成员richTextBox1。
您可能希望定义Form1的句柄，而不是Form。
private: Form1 ^ otherform;
另一方面，我建议您使用事件机制在表单之间进行通信。第二种形式触发传递正确参数的事件，第一种形式安装该事件的句柄并进行适当的处理。
答案 1 :(得分：0)
首先，在Form1类中，添加一个将设置RichTextBox值的方法：
public:
void SetValue(System::String ^text)
{
richTextBox1->AppendText(text);
}
然后在你的form2中点击按钮：
System::Void Form2::button1_Click(System::Object^ sender, System::EventArgs^ e)
{
currForm1->SetValue("Hello\n");
}
它还没有做任何事情来编译，是在Form1 Form2.h文件中做一个早期的声明。例如，在第一个命名空间中
ref class Form1;
它将在Form1.h文件中执行相同的操作：以这种方式声明form2：
ref class Form2;
如果您有任何问题，您的程序可以正常使用，请不要犹豫
答案 2 :(得分：0)
例如：
Form1.h：
#pragma once
#include "Form2.h"
namespace ArrayShallow {
ref class Form2;
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>
/// Description résumée de Form1
/// </summary>
public ref class Form1 : public System::Windows::Forms::Form
{
public:
Form1(void)
{
InitializeComponent();
//
//TODO: ajoutez ici le code du constructeur
//
}
protected:
/// <summary>
/// Nettoyage des ressources utilisées.
/// </summary>
~Form1()
{
if (components)
{
delete components;
}
}
private: System::Windows::Forms::RichTextBox^ richTextBox1;
private: System::Windows::Forms::Button^ button1;
protected:
private:
/// <summary>
/// Variable nécessaire au concepteur.
/// </summary>
System::ComponentModel::Container ^components;
#pragma region Windows Form Designer generated code
/// <summary>
/// Méthode requise pour la prise en charge du concepteur - ne modifiez pas
/// le contenu de cette méthode avec l'éditeur de code.
/// </summary>
void InitializeComponent(void)
{
this->richTextBox1 = (gcnew System::Windows::Forms::RichTextBox());
this->button1 = (gcnew System::Windows::Forms::Button());
this->SuspendLayout();
this->richTextBox1->Location = System::Drawing::Point(32, 25);
this->richTextBox1->Name = L"richTextBox1";
this->richTextBox1->Size = System::Drawing::Size(100, 96);
this->richTextBox1->TabIndex = 0;
this->richTextBox1->Text = L"";
this->button1->Location = System::Drawing::Point(153, 157);
this->button1->Name = L"button1";
this->button1->Size = System::Drawing::Size(75, 23);
this->button1->TabIndex = 1;
this->button1->Text = L"button1";
this->button1->UseVisualStyleBackColor = true;
this->button1->Click += gcnew System::EventHandler(this, &Form1::button1_Click);
this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
this->ClientSize = System::Drawing::Size(284, 261);
this->Controls->Add(this->button1);
this->Controls->Add(this->richTextBox1);
this->Name = L"Form1";
this->Text = L"Form1";
this->Load += gcnew System::EventHandler(this, &Form1::Form1_Load);
this->ResumeLayout(false);
}
#pragma endregion
private:
Form2 ^ currForm2;
private: System::Void Form1_Load(System::Object^ sender, System::EventArgs^ e);
private: System::Void button1_Click(System::Object ^sender, System::EventArgs^ e);
public:
void SetValue(System::String ^text)
{
richTextBox1->AppendText(text);
}
};
}
Form1.cpp：
#include "stdafx.h"
#include "Form1.h"
using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;
using namespace ArrayShallow;
System::Void Form1::Form1_Load(System::Object^ sender, System::EventArgs^ e)
{
currForm2 = gcnew Form2(this);
}
System::Void Form1::button1_Click(System::Object^ sender, System::EventArgs^ e)
{
currForm2->Show();
}
int main(array<System::String ^> ^args)
{
Application::EnableVisualStyles();
Application::SetCompatibleTextRenderingDefault(false);
Application::Run(gcnew Form1());
return (0);
}
然后在form2.h
#pragma once
#include "Form1.h"
using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;
namespace ArrayShallow {
ref class Form1;
/// <summary>
/// Description résumée de Form2
/// </summary>
public ref class Form2 : public System::Windows::Forms::Form
{
private:
Form1 ^currForm1;
public:
Form2(Form1 ^theForm1)
{
InitializeComponent();
//
//TODO: ajoutez ici le code du constructeur
//
currForm1 = theForm1;
}
protected:
/// <summary>
/// Nettoyage des ressources utilisées.
/// </summary>
~Form2()
{
if (components)
{
delete components;
}
}
private: System::Windows::Forms::Button^ button1;
protected:
private:
/// <summary>
/// Variable nécessaire au concepteur.
/// </summary>
System::ComponentModel::Container ^components;
#pragma region Windows Form Designer generated code
/// <summary>
/// Méthode requise pour la prise en charge du concepteur - ne modifiez pas
/// le contenu de cette méthode avec l'éditeur de code.
/// </summary>
void InitializeComponent(void)
{
this->button1 = (gcnew System::Windows::Forms::Button());
this->SuspendLayout();
//
// button1
//
this->button1->Location = System::Drawing::Point(135, 107);
this->button1->Name = L"button1";
this->button1->Size = System::Drawing::Size(75, 23);
this->button1->TabIndex = 0;
this->button1->Text = L"button1";
this->button1->UseVisualStyleBackColor = true;
this->button1->Click += gcnew System::EventHandler(this, &Form2::button1_Click);
//
// Form2
//
this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
this->ClientSize = System::Drawing::Size(284, 261);
this->Controls->Add(this->button1);
this->Name = L"Form2";
this->Text = L"Form2";
this->ResumeLayout(false);
}
#pragma endregion
private: System::Void button1_Click(System::Object^ sender, System::EventArgs^ e);
};
}
事件，在form2.cpp中
#include "stdafx.h"
#include "Form2.h"
using namespace ArrayShallow;
System::Void Form2::button1_Click(System::Object^ sender, System::EventArgs^ e)
{
currForm1->SetValue("Hello\n");
}
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