find if text in edit box has been changed

This is a discussion on find if text in edit box has been changed within the Windows Programming forums, part of the Platform Specific Boards category; hey, i was wondering how you tell and take action if the text in an edit box has changed. like, ...

  1. #1
    Shibby willc0de4food's Avatar
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    find if text in edit box has been changed

    hey, i was wondering how you tell and take action if the text in an edit box has changed. like, with some programs - they append a * to the end of the name of the file open. then if you haven't saved the file since the last time it's been edited, when you go to close the program a prompt appears saying "dude, you haven't saved this and its been changed..wanna do it?" then you have a Yes, No, and Cancel button. so yea..how do i tell if the text has been changed, and how would i go about creating this prompt when the program is closing? thanks
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  2. #2
    Work in Progress..... Jaken Veina's Avatar
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    The parent window of the Edit control receives a WM_COMMAND Message. The LOWORD of wParam is the ID of the control and the HIWORD is EN_CHANGE, a notification that says the text has changed. And, if you need to use it, the lParam of the message is a handle to the control. You can probably figure out the rest.
    Last edited by Jaken Veina; 07-06-2005 at 10:12 AM.
    Code:
    void function(void)
     {
      function();
     }

  3. #3
    Shibby willc0de4food's Avatar
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    alrighty, thanks.. we'll see what i can come up with
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  4. #4
    Shibby willc0de4food's Avatar
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    ..wow.....that was a lot more work than i thought it would be, but i believe that i got it working now. having this function with a MDI is quite the hassle as you must check in multiple places to see if theres an unsaved file before closing the files or the program, and then find out which file it is that is not saved. and then once you do save it, you have to notify your program of that. however, i won't continue to ramble on..just thought that someone wanting to accomplish a similar task may find that info useful.
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  5. #5
    -AppearingOnThis..........
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    It may be easier if you just have to retrieve the state of the edit at a certain point (ie. not moniter it over a period of time) to use the EM_GETMODIFY message. Simply send that to the edit and the return value'll be non-zero if the contents have been edited and zero if they haven't.

  6. #6
    Shibby willc0de4food's Avatar
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    and when would i send this message, when the user wants to close a document or the program? do you have any sample code?
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  7. #7
    -AppearingOnThis..........
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    Sorry, forgot I posted...

    Yeah, just send it when the user's about to close, something of this sort:
    Code:
    //yada yada yada, window procedure
    case WM_CLOSE : 
    	if(SendDlgItemMessage(winh, EDIT_ID, WM_GETMODIFY, 0, 0)) 
    	{
    		if(MessageBox(winh, "This document has not been saved, are you sure you want to close?", "Alert", 
    			MB_ICONEXCLAMATION | MB_YESNO) == IDYES) DestroyWindow(winh);
    	}
    	else DestroyWindow(winh);
    	break;
    //whatever else...
    And whenver you do save it you could send the edit a WM_SETMODIFY message to set the modification status to 0.
    Last edited by SirNot; 07-09-2005 at 04:09 AM.

  8. #8
    Shibby willc0de4food's Avatar
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    ic ic, alright..thanks. i'll look into giving that a try.
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  9. #9
    Shibby willc0de4food's Avatar
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    uhm....i'm thinking there is no such "WM_GETMODIFY" value/message/whatever .. ? because when i search msdn for it, i get nothing..when i search google for it..all i get is a link to this post...when i try to compile with it...Dev-C++ is like "f* you >:O fix your code" lol

    anyone have a replacement?
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  10. #10
    train spotter
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    try

    EM_GETMODIFY
    "Man alone suffers so excruciatingly in the world that he was compelled to invent laughter."
    Friedrich Nietzsche

    "I spent a lot of my money on booze, birds and fast cars......the rest I squandered."
    George Best

    "If you are going through hell....keep going."
    Winston Churchill

  11. #11
    Shibby willc0de4food's Avatar
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    awesome :-D

    thanks.
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  12. #12
    Shibby willc0de4food's Avatar
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    so then if i'm going to use the EN_CHANGE message (for telling if the text has been modified or not and then sending that information to the status bar)...how do i make it go away after the file has been saved? also, after saving the text in the edit control, when i go to close the program it still says the file hasn't been saved and prompts to do so? do i need to like, clear the messages after saving? thanks.
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  13. #13
    train spotter
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    Strangely enough

    EM_SETMODIFY
    "Man alone suffers so excruciatingly in the world that he was compelled to invent laughter."
    Friedrich Nietzsche

    "I spent a lot of my money on booze, birds and fast cars......the rest I squandered."
    George Best

    "If you are going through hell....keep going."
    Winston Churchill

  14. #14
    Shibby willc0de4food's Avatar
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    :-\ yea....*feels retarded* lol and i would use SengMessage() to set that?

    lol thanks..



    // prly someting like SendMessage(hEdit, EM_SETMODIFY, FALSE, 0);
    Last edited by willc0de4food; 09-11-2005 at 12:30 AM.
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