button click

This is a discussion on button click within the C++ Programming forums, part of the General Programming Boards category; ok I have another noobie question. In Visual C++ I have a button on "Form1", I want it to run ...

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    button click

    ok I have another noobie question. In Visual C++ I have a button on "Form1", I want it to run a function in "program.cpp".


    I also have a label named "label1" and in the function in "program.cpp" I want to change the label's text but I cant figure out how to do this either

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    sorry

    In Visual C++ I have a button on "Form1", I want it to run a function in "program.cpp" when it is clicked.

    Code:
    so: button is clicked
    
    in Form1.h
    -------------
    
    	private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
                                changetext();
    			 }
    
    in program.cpp
    ------------------
    
    void changetext() {
         label1->Text = "Hey";
    }
    
    
    But none of this works
    I also have a label named "label1" and in the function in "program.cpp" I want to change the label's text but I cant figure out how to do this either
    Last edited by Stringer; 10-12-2006 at 06:44 PM.

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    You need to learn how to process "GUI messages".

    Do you have a book on GUI programming? You are going to need one.

    I assume this is Windows, so here's a tutorial.

    ok I have another noobie question...
    If you are new to C++ you need to learn standard (non-GUI) C++ before getting into this.

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    yeah I learned basic coding and I am currently just beginning to learn "GUI programming"

    Is their a really good book I could buy that would teach me coding and GUI programming, I have one but its really outdated

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    I still cant understand how to do this, its driving me crazy

    in borland C++ builder when I put a button on a form and double click it I get something like "void __fastcall TForm1::ButtonClick...." but it puts it in the .cpp file not the header file. Then all I have to do is put code in that function.

    In visual C++ I cant do anything because it wont let me call functions or variables from .cpp to .h or .h to .cpp. I cant do anything with anything

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    Reverse Engineer maxorator's Avatar
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    GUI programming goes to a platform specific board.

    Code:
    	private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
                                changetext();
    			 }
    What the...? You call that Win32 API. If you don't, name the wrapper!
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    Cat without Hat CornedBee's Avatar
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    It's C++/CLI, obviously (the only language where you might see a ^ after a type.)

    OP: your posts suggest that you don't know the basics well enough to start GUI programming yet. Also, C++/CLI is not C++, and thus not a good option for learning GUI programming in C++.
    All the buzzt!
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    Reverse Engineer maxorator's Avatar
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    That C++/CLI looks so ugly.
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    Its hard... But im here swgh's Avatar
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    I used windows forms when I was using visual basic, I hated it to be honest. Much prefer C++

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    Windows Forms is a .Net technology. Not a Visual Basic one. You used it with VB.Net
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    this
    Code:
    private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
    			 }
    was generated by Visual C++. I dont understand anything about it except that it does whatever is between {} when button1 is clicked on the form.

    I really need to figure this out even if im not ready for it yet, I can get almost everything to work in "Borland C++ Builder 6" but I switched to Microsoft "Visual C++ Express" because it makes everything else easier and this is the only thing holding me up.

    all I want to know is how to change the text of a label from the source file and how to run a function in the source file when a button is clicked. (In Microsoft Visual C++ Express)
    Last edited by Stringer; 10-13-2006 at 10:34 AM.

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    Frequently Quite Prolix dwks's Avatar
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    Code:
    System::Object^  sender, System::EventArgs^  e
    I've never seen that syntax before, except in Pascal. Are you sure they aren't *s?
    dwk

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    Why don't you just use standard VB coding? I mean, underneath your command button coding, just put which page you want to come with the button. Meaning let's say you made another page well .Hide the page with your command button and then .Show the next page you want to show up.

  15. #15
    Cat
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    Quote Originally Posted by dwks
    Code:
    System::Object^  sender, System::EventArgs^  e
    I've never seen that syntax before, except in Pascal. Are you sure they aren't *s?
    That is C++/CLI, it's the newer way to use .NET in Visual Studio 2005, as Managed C++ is now deprecated.

    Essentially a compiler-specific extension to the language. ^ is a handle to a managed object (e.g. one that's automatically garbage collected).
    Last edited by Cat; 10-13-2006 at 10:34 PM.
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