Update textbox on another form - C++ Winforms

Question

Update textbox on another form - C++ Winforms

José Carlos 886

Hi friends

I have a small C++ Winforms application. I have only two forms (form1 and form2). I being in form2, I need to update data in two textBox that are in form1.

How to do this?

Thanks.

David Lowndes 4,726 Reputation points

2022-12-13T23:29:50.957+00:00

I'd guess that form2 is invoked from form1, so pass a reference to form1 when you create form2, You can then use that from form2 methods to access public members of form1.
José Carlos 886 Reputation points

2022-12-13T23:43:30.167+00:00

Hi David.
Thanks for the answer, but I don't know how to do this. I'm starting in C++Winforms. Can you show me a code?
form2 is loaded inside a panel on form1.

Accepted answer

0 additional answers

Your answer

David Lowndes 4,726 Reputation points

2022-12-13T23:29:50.957+00:00

I'd guess that form2 is invoked from form1, so pass a reference to form1 when you create form2, You can then use that from form2 methods to access public members of form1.
José Carlos 886 Reputation points

2022-12-13T23:43:30.167+00:00

Hi David.
Thanks for the answer, but I don't know how to do this. I'm starting in C++Winforms. Can you show me a code?
form2 is loaded inside a panel on form1.

Answer 1

YujianYao-MSFT 4,296 Microsoft External Staff

Hi @Anonymous ,

You need to complete the preparations in this link before implementing this function.

Now, you need to right click on the textBox and select properties, then double click on TextChanged in the event list, this event is triggered when the text property finds a change.

Then enter the following code to achieve your needs.

           private:  
            System::Void textBox1_TextChanged(System::Object ^ sender,  
                                              System::EventArgs ^ e) {  
              
            MyForm ^ form1 = (MyForm ^) Application::OpenForms["MyForm"];  

              form1->txt1->Text = textBox1->Text;  
            }  

           private:  
            System::Void textBox2_TextChanged(System::Object ^ sender,  
                                              System::EventArgs ^ e) {  
              MyForm ^ form1 = (MyForm ^) Application::OpenForms["MyForm"];  

              form1->txt2->Text = textBox2->Text;  
            }

RESULT:

Best regards,

Elya

If the answer is the right solution, please click "Accept Answer" and upvote it.If you have extra questions about this answer, please click "Comment".

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

José Carlos 886 Reputation points

2022-12-14T10:21:58.36+00:00

Hi Elya.

That way it doesn't work for me. I'll tell you how the program works. form1 stays open all the time. The two textboxes I want to update are in a panel at the top of form1. form2 is loaded inside a panel on form1. So I can't open another form according to the solution you presented to me.
I inform the data in the 15 textbox. When I click the Voltar button, I need to update the two textboxes at the top of the form with data that I've entered in the textBoxes. See image below:
The area circled in yellow is form2 inside a panel. The area circled in orange is form1, which is open all the time and with the two textboxes I need to update. Have I been clear? If you don't understand, feel free to ask. And sorry for taking up your time. That's all that's left for me to close the project.

YujianYao-MSFT 4,296 Microsoft External Staff

Hi @Anonymous ,
Do you need to pass the NumSorteio and Data from Form2 to Form1 after pressing the voltar? I wrote a sample, I didn't use 15 textboxes, is this the effect you want?

Header.h

#include "MyForm.h"  
#include "MyForm1.h"

MyForm.h

  #include"Header.h"  
    public ref class MyForm : public System::Windows::Forms::Form  
    	{  
    	public:    
    		MyForm(void)  
    		{  
    			InitializeComponent();  
    		}  
                   public:  
                    property System::Windows::Forms::TextBox ^  
                        txt1 {  
                          System::Windows::Forms::TextBox ^ get() {  
                            return textBox1;  
                          } void set(System::Windows::Forms::TextBox ^ value) {  
                            textBox1 = value;  
                          }  
                        }  
                        public  
                        : property System::Windows::Forms::TextBox ^  
                          txt2 {  
                            System::Windows::Forms::TextBox ^ get() {  
                              return textBox2;  
                            } void set(System::Windows::Forms::TextBox ^ value) {  
                              textBox2 = value;  
                            }  
                          }

YujianYao-MSFT 4,296 Microsoft External Staff

MyForm.h

private:  
                System::Void button1_Click(System::Object ^ sender,  
                                           System::EventArgs ^ e) {  
                  Project50::MyForm1 ^ dlg = gcnew Project50::MyForm1();  
                  dlg->Show();  
                }

MyForm1.h

 //Generate a click event after double-clicking the button  
//modify it to a function declaration  
 private:  
        System::Void button1_Click(System::Object ^ sender,  
                                   System::EventArgs ^ e);

MyForm1.cpp

#include "MyForm.h"  
#include "MyForm1.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;  
 System::Void Project50::MyForm1::button1_Click(System::Object ^ sender,  
                                    System::EventArgs ^ e) {  
    Project50::MyForm ^ form1 =  
       (Project50::MyForm ^) Application::OpenForms["MyForm"];  
    form1->txt1->Text = textBox1->Text;  
    form1->txt2->Text = textBox2->Text;  
 }

YujianYao-MSFT 4,296 Microsoft External Staff

Source.cpp

#include "MyForm.h"  
#include "MyForm1.h"  
using namespace Project50;  
using namespace System;  
using namespace System::Windows::Forms;  
[STAThreadAttribute]   
    int main(array<System::String ^> ^ args)  
{  
  Application::EnableVisualStyles();  
  Application::SetCompatibleTextRenderingDefault(false);  
  MyForm form;  
  
  Application::Run(% form);  
  return 0;  
}

The method used in the code can also solve your last problem, I will add it to the reply, if it solves your problem, I hope you mark it as the answer．

José Carlos 886

That's what I want.
I just didn't understand the code snippets below: Does it have to be typed? And that button1_Click would be the Voltar button? That's what I'm in doubt about.

MyForm.h  
  
 private:  
                 System::Void button1_Click(System::Object ^ sender,  
                                            System::EventArgs ^ e) {  
                   Project50::MyForm1 ^ dlg = gcnew Project50::MyForm1();  
                   dlg->Show();  
                 }  
  
MyForm1.h  
  
  //Generate a click event after double-clicking the button  
 //modify it to a function declaration  
  private:  
         System::Void button1_Click(System::Object ^ sender,  
                                    System::EventArgs ^ e);

`

José Carlos 886

Sorry for not understanding, but I don't understand the 2 codes below;
Will I have to create a button on MyForm 1 and MyForm2 and double-click these buttons? I got a little lost.
I had said that it would be the update on the Voltar button, but it is on the Atualizar button.
I think it makes no difference which button.
I'm having a little trouble.
Thank you for your patience with me.

MyForm.h  
  
 private:  
                 System::Void button1_Click(System::Object ^ sender,  
                                            System::EventArgs ^ e) {  
                   Project50::MyForm1 ^ dlg = gcnew Project50::MyForm1();  
                   dlg->Show();  
                 }  
  
MyForm1.h  
  
  //Generate a click event after double-clicking the button  
 //modify it to a function declaration  
  private:  
         System::Void button1_Click(System::Object ^ sender,  
                                    System::EventArgs ^ e);

José Carlos 886 Reputation points

2022-12-15T12:55:14.217+00:00

I got my friend.
Thank you very much.

YujianYao-MSFT 4,296 Microsoft External Staff

Hi @Anonymous ,

**MyForm.h**  
      
  private:  
                  System::Void button1_Click(System::Object ^ sender,  
                                             System::EventArgs ^ e) {  
                    Project50::MyForm1 ^ dlg = gcnew Project50::MyForm1();  
                    dlg->Show();  
                  }

This code is only used to display Form2 from Form1, if you have other ways to display Form2, you could ignore it.

**MyForm1.h**  
      
   //Generate a click event after double-clicking the button  
  //modify it to a function declaration  
   private:  
          System::Void button1_Click(System::Object ^ sender,  
                                     System::EventArgs ^ e);

Yes, this button is Voltar, double click it just to generate click event and change it to function declaration. The implementation of this button is in MyForm1.cpp.

YujianYao-MSFT 4,296 Reputation points Microsoft External Staff

2022-12-19T01:26:07.943+00:00

You're welcome！

Share via

Update textbox on another form - C++ Winforms

0 additional answers

Your answer