Need Help. Going Insane

This is a discussion on Need Help. Going Insane within the C++ Programming forums, part of the General Programming Boards category; I have an MDI application, been developed in C++ Builder. On each child form there is an image object. To ...

  1. #1
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    Need Help. Going Insane

    I have an MDI application, been developed in C++ Builder. On each child form there is an image object.
    To cycle through the child forms I use a For loop.
    My problem is this.
    Going through the loop I can only access properties, methods and events of the form and NOT the objects on the form. How can I access the objects on the form.

    Code:
    for (int index = MDIChildCount - 1; index >= 0; index--)
    {
       something = MDIChildren[index]............... STUCK............?????
    }
    What I am looking for is the pixel array of an image object on the form.
    I would be greatful of any suggestions or input.

  2. #2
    Registered User Codeplug's Avatar
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    If you have an array of objects, you can access public methods and members with:
    Code:
    objArray[i].method();
    objArray[i].member;
    //or if array of pointers
    objArray[i]->method();
    objArray[i]->member;
    If you are looking for something more specific related to windows programming using C++ Builder, you might want to try the Windows programming board.

    gg

  3. #3
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    I think i'll go back to a SDI application. Not as good but it will do. Life is too short to be fn around with simple problem that are probably smacking you in the face, but you are looking at it so long you can't see the answer.



    ohh...

    Code:
    void main(void)
    {
    }
    does it really matter

  4. #4
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    AARGG... again a stupid thread title? I think I am going insane now...

  5. #5
    Mayor of Awesometown Govtcheez's Avatar
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    Originally posted by Ivan!
    AARGG... again a stupid thread title? I think I am going insane now...
    Hey, thanks for your contribution to this thread. It was obviously well thought out and took you many hours to think up, as well as being TOTALLY WORTHLESS. If you don't have anything to contribute, shut your damn mouth.

    Now, to add something:

    > does it really matter

    Yes, it matters. Declaring main as anything other than int is undefined. main always returns an int.

  6. #6
    Banned nickname_changed's Avatar
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    I haven't used MDI applications in CBuilder, but can't you access it like this:

    PHP Code:
    myMDIForm[index]->myMDIObject->ObjectProperty
    And tell the file that will use this line to include the unit header for the file that contains myMDIForm?

    ~ Paul
    Last edited by nickname_changed; 03-28-2003 at 06:11 PM.

  7. #7
    Programming Sex-God Polymorphic OOP's Avatar
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    Originally posted by spidereen
    ohh...

    Code:
    void main(void)
    {
    }
    does it really matter
    Yes it does matter. Don't do it!

  8. #8
    Banned nickname_changed's Avatar
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    But why does main always return an int? Don't worry, I always declare it as int and I dont mean to question you o great Polymorphic OOP, but why? Is it something to do with the operating system knowing that the process has finished?

    ~ Paul

  9. #9
    Skunkmeister Stoned_Coder's Avatar
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    because in the c runtime the call to main will look something like this...

    int return_value = main(argc,argv);

    the runtime may then use this value before passing up to OS. Not sure but i think thats implementation defined.Usually the return value from main gets passed back to the OS.
    Free the weed!! Class B to class C is not good enough!!
    And the FAQ is here :- http://faq.cprogramming.com/cgi-bin/smartfaq.cgi

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    Banned nickname_changed's Avatar
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    C Runtime? I thought languages like Java use a runtime, but not langauges like C/C++?

    Or do you mean like theres a C Runtime located in the kernel of the operating system that looks for a main function?

    But if that is so, how does the OS know whats an ASM file and whats a C++ file? Would a compiled ASM file and a compiled C++ file look reliatively the same at byte-level if they are supposed to do the same thing, ie add 2 numbers?

    Or is the C Runtime included inside the compiled application?

    Now I'm even more confused.

    ~ Paul

  11. #11
    Skunkmeister Stoned_Coder's Avatar
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    The c runtime is part of every program you write. The compiler slides it in. It has several jobs. One of which is to call main. Others are to open some streams(files), stdin,stdout,stderr etc....
    All of this must happen before main gets called.
    Free the weed!! Class B to class C is not good enough!!
    And the FAQ is here :- http://faq.cprogramming.com/cgi-bin/smartfaq.cgi

  12. #12
    Banned nickname_changed's Avatar
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    Ohh okay, I never knew that. Thanks very much

    ~ Paul

  13. #13
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    PHP Code:
    myMDIForm[index]->myMDIObject->ObjectProperty
    And tell the file that will use this line to include the unit header for the file that contains myMDIForm?
    Thanks for your help. But I tried that. It compiled. But during execution it crashed with pointer errors.

  14. #14
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    Try it again but make sure your pointing to objects/forms that do exist on the form and make index a number that you know will work for a test.

    ~ Paul

  15. #15
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    Yeah I tried
    Code:
    store = ChildForm[1]->imgScene->Canvas->Pixels[1][1];
    And this returns a pointer error during execution.

    1 is the second last form to be created.
    i.e. 0 being the last and MDIChildCount - 1 being the first.

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