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 :)

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.

alrighty, thanks.. we'll see what i can come up with ;)

..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.

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.

and when would i send this message, when the user wants to close a document or the program? do you have any sample code?

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.

ic ic, alright..thanks. i'll look into giving that a try.
:)

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?

try

EM_GETMODIFY

awesome :-D

thanks.

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.

Strangely enough

EM_SETMODIFY

:-\ yea....*feels retarded* lol and i would use SengMessage() to set that?

lol thanks..



// prly someting like SendMessage(hEdit, EM_SETMODIFY, FALSE, 0);
:)