Quick positioning of the caret at the end of the text - CodeProject

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Problem

I was using EditControl window to dump some logging/trace messages line by line and found out that a simple routine involving:

SendDlgItemMessage(hwndDlg,IDC_SOMEEDITCONTROL, 
    EM_REPLACESEL,0,(long)lpszTextBuffer);

works only if you don't reposition the caret in EditControl window (which inadvertantly happens when you scroll back and forth to check on previous messages...). So, if you by accident repositioned the caret, the next text dump will disrupt existing line and produce undesirable effect of garbled data...

A Solution

A simple workaraound may help -- the following "duo" does the trick:

SendDlgItemMessage(hwndDlg,IDC_SOMEEDITCONTROL, EM_SETSEL, 0, -1);
SendDlgItemMessage(hwndDlg,IDC_SOMEEDITCONTROL, EM_SETSEL, -1, -1);

This will position a runaway caret to the end of the text in EditControl..., so that the next call to:

SendDlgItemMessage(hwndDlg,IDC_SOMEEDITCONTROL, 
    EM_REPLACESEL,0,(long)lpszTextBuffer);

will append a new line to the bottom of the existing body of text... ;-)

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About the Author

Botticelli

Web Developer
United States

Programming "Artist" since 1984

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Your article is great.It has helped me a lot because I needed to put the caret at the end of the text and I did not know how.Thanks a lot.Now I want to insert the name of my document in the document( of course first it must be saved).So, I have to insert it at the beggining of my document.Do you have any idea?
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((CEdit)GetDlgItem(IDC_MY_EDIT))->SetSel(0, 0); TOXCCT >>> GEII power* [toxcct][VisualCalc]
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I want to highlight a particular line in edit box, and auto scroll. how to do that? R.K.Singh
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Lifetime answer, but why not... if you are using MFC, you can use the...

CEDit::LineIndex( int nLine = -1 )

...call of a CEDit to retrieve the character position of the line you want to select, this means that you can do something like:

bool SelectLine(CEdit* pEdit, int nLine)
{
    int nStartPos = pEdit->LineIndex(nLine);
 
    if (nLine < 0)
        return false;
 
    int nEndPos = pEdit->LineIndex(nLine+1);
 
    pEdit->SetSel(nStartPos, nEndPos);
 
    return true;
}

Cool | :cool:

... and to maintain the article style:

bool SelectLine(HWND hWndDlg, UINT uCtrl, int nLine)
{
    int nStartPos =
        SendDlgItemMessage(
            hwndDlg,
            uCtrl, EM_LINEINDEX, nLine, 0); 
 
    if (nLine < 0)
        return false;
 
    int nEndPos =
        SendDlgItemMessage(
            hwndDlg,
            uCtrl, EM_LINEINDEX, nLine+1, 0); 
 
    SendDlgItemMessage(
        hwndDlg,
        uCtrl, EM_SETSEL, nStartPos, nEndPos); 
 
    return true;
}

Cool | :cool:

Deceived by the innefective EM_SCROLLCARET (!), I finally found this trick: LRESULT result = 0; do { result = SendMessage(hwnd, EM_SCROLL, SB_PAGEDOWN, 0); } while ((HIWORD(result) == TRUE) && (LOWORD(result) > 0));
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Keep this solution around man, this is the only method i've found to scroll down the caret in a edit box in a win32 environment (without mfc) ---
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back in '92 when MSDN was first published on CD Normski. - the next bit of code is self modifying ... jmp 0xCODE
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With all due respect, I'm not saying it's not there, but it did not jump in my lap when I looked for it in MSDN. It may have been at one time, or it may be in one of the various samples or one of the deep dark corners of the MSDN (which I think is outstanding by the way) or it may have even been right under my nose and I failed to see it and passed it by (pretty common occurance with me).

He spent some time trying to find this and thought he'd share it online just in case someone else had trouble finding it. It's a very useful tip and probably in every book by now but it a very useful and probably sought after trick for a beginner. This site is filled with redundant stuff but I would caution you not to criticize every user who posts something that may already exist in the MSDN.

I have found a great deal of good advise on this site and would still be looking through my books and MSDN for some of them if they weren't posted. Just because it's there, doesn't mean everyone will find it...quickly. Let's not get so high on ourselves that we forget this site is about learning...not bragging about what we already know.

Too many people bash others on this site and it's really sad that people don't realize that we'd all be "nowhere" without documentation (and lot's of it).

Sorry with over 12years of Win16/32 programming experience I just take for granted the first place to look for stuff like this is either the good ole' Charles Petzold Programming Windows, for at least look at MSDN. JFYI (Just for your interest) the orginal Windows programming manuals came in a box of about 22 books.
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I've only got 15 years experience in programming but I would be lost without MSDN or this site. I usually check MSDN first, then search engines, then my books. Finding this snippet saved me a bunch of time.

I'm not sure what your comment about the 22 books thingy was or what it has to do with my comment but your welcome to them. There's nothing better than having a question, typing it in, and getting 5 million-zillion links to helpful comments and tidbits like this one. And, by the way, some of your posts have helped me from time to time so thank you for posting them.

I promise I won't criticize you if I find stuff from your articles somewhere in the deep dark halls of MSDN or in a Petzold book. I'd rather find too many links to helpful pages than "No search results were found"

General News Suggestion Question Bug Answer Joke Rant Admin

Quickly position the caret at the end of edit control text...

Type	Article
Licence
First Posted	9 Aug 2002
Views	67,531
Bookmarked	16 times

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