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Cedit limiting text to fixed characters

Posted on 2001-06-18
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Last Modified: 2013-11-20
Hi

I have a member variable bound to cEdit in class wizard. I am trying to restrict user input to this variable to 90 characters. How do I do it..

Please let me know.

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Question by:mjagan
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11 Comments
 

Author Comment

by:mjagan
ID: 6204336
Actually I wrote a function setlimittext and gave it in OnInitDialog but the program caused debug assertion failure when it encounters the setlimittext line that I included.

I was wondering how could the debug assertion failure happen before it is even evaluating the input in this case it did not reach the input screen.
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LVL 8

Expert Comment

by:mnashadka
ID: 6204900
Go into the classwizard after adding the CEdit.  Add a member variable to the edit box (of type CString).  After you do, you will be able to highlight it and there is a "Maximum Characters" edit box at the bottom that you can insert your 90 or whatever.  If you need to do something a little more custom, you can add a message handler to the EN_CHANGE message of the edit box, but the first method will probably work for you.

Good luck.
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LVL 2

Expert Comment

by:mirec
ID: 6205428
CEdit::SetLimitText
void SetLimitText( UINT nMax );

Parameters

nMax

The new text limit, in bytes.

Remarks

Call this member function to set the text limit for this CEdit object. The text limit is the maximum amount of text, in bytes, that the edit control can accept.

Futher details in MSDN.
BYE,mirec
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Accepted Solution

by:
mjagan earned 20 total points
ID: 6206566
As manshadaka suggested I could not add any member variable to the class wizard. It only allows me to add class and other buttons are diabled.

I added the setlimit function as mirec said after OnInitDialog and it bombs immediately after it enters onInitDialog with assertion failure.

Thanks for the response..
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LVL 2

Expert Comment

by:mirec
ID: 6207135
Send please, the source code of your OnInitDialog().
m.
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Author Comment

by:mjagan
ID: 6207209
CDialog :: DoDataExchange(pDX)
DDX_Control(pDX, IDC_VIEW_INV_TXT, m_sAdjWinMsg);
//}} AFX_DATA_MAP

BOOL mywindata:: OnInitDialog()

{
 int TotalAmt;
 int status
m_sAdjWinMsg.SetLimitText(90);

While running program in debug mode it crashes in setlimittext function and goes to mfc/include/afx2...inl and shows nmax as 90 or whatever bytes I give as parameter to setlimittext funnction

Thanks

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LVL 2

Expert Comment

by:mirec
ID: 6207221

Try initialise base class before:

BOOL mywindata:: OnInitDialog()

{
CDialog::OnInitDialog();

int TotalAmt;
int status
m_sAdjWinMsg.SetLimitText(90);

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Author Comment

by:mjagan
ID: 6207576
I tried and unfortunately it did not work.

Thanks for your response again..
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Expert Comment

by:Loggy_yyj
ID: 6208893
Please check the source control ID, is there exist the same type control with the same ID value in your application?

You can check what cause the assertion fails; checking whether the control member is valid!
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Expert Comment

by:Loggy_yyj
ID: 6208895
Please check the source control ID, is there exist the same type control with the same ID value in your application?

You can check what cause the assertion fails; checking whether the control member is valid!
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LVL 23

Expert Comment

by:Roshan Davis
ID: 9490010
No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:

Answered by : mnashadka

Please leave any comments here within the next seven days.

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!

Roshan Davis
EE Cleanup Volunteer
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