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Giving dynamic text to a dialog/edit box

Posted on 2004-09-14
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Last Modified: 2010-04-24
Hi,
I am currently working on a fax machine module. The qustion I have is , I have couple of telephone keys (numbers pad) and every bitmap when clicked (Selected) gives a specific number in the edit box. I am using SetDlgItemText( )function. I know this will give only one input for every touch(push). All I want is to show the complete set of numbers in the editbox as the user pushes a button/key.
Please give me the appropriate function or a hint I should call instead of SetDlgItemText( ) function.

 
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Question by:yqureshi
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LVL 6

Expert Comment

by:Svetlin_Panayotov
ID: 12056711
You can get the old text with GetDlgItemText(), append your new char and then set it again with SetDlgItemText().
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Author Comment

by:yqureshi
ID: 12057412
Thats the key how am I going to append a new character in the edit box using the push buttons. I think SetDlgItemText () will set the edit box and remove the previous entries
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LVL 6

Expert Comment

by:Svetlin_Panayotov
ID: 12057987
You can have something like this in your message handler (when some of the buttons is pressed):

LPCTSTR newText; //the text from the button - you should have it already
LPCTSTR szText = new char[40]; //40 should be enough
ZeroMemory(szText, sizeof(szOldText));
GetDlgItemText(hDlg, ID_BTN, szText, 39);
strcat(szText,newText);
SetDlgItemText(hDlg, ID_EDIT, szText);
delete[] szText;
delete[] newText;

I don't have a compiler here to check it - but it should be working fine.

Svetlin
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Expert Comment

by:Svetlin_Panayotov
ID: 12061561
Well - some fixes - I finally got near machine with VC :)
      LPTSTR newText; //the text from the button - you should have it already
      LPTSTR szText = new char[40]; //40 should be enough
      ZeroMemory(szText, sizeof(szText));
      GetDlgItemText(IDC_EDIT, szText, 39);
      strcat(szText,newText);
      SetDlgItemText(IDC_EDIT, szText);
      delete[] szText;
      delete[] newText;

Svetlin
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Author Comment

by:yqureshi
ID: 12061876
Hi,
Thank you very much Svetlin_Panayotovfor your advice and code. The code really worked a minor changes and whola its working properly. Only problem left now is to erase the last entry I hope I will try that one out.

Anyway Thanks Again for the helping hand
yqureshi
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Accepted Solution

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Svetlin_Panayotov earned 200 total points
ID: 12061944
If I got it right - erasing the last digit will look like this:

      LPTSTR szText = new char[40]; //40 should be enough
      ZeroMemory(szText, sizeof(szText));
      GetDlgItemText(IDC_TEXT, szText, 39);
      if (strlen(szText) > 0)
      {
            szText[strlen(szText)-1] = '\0';      //Terminate the string before the last char
      }
      
      SetDlgItemText(IDC_TEXT, szText);
      delete[] szText;
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Author Comment

by:yqureshi
ID: 12065677
Yes it is a absolutly correct, Only SetItem and GetItem takes 4 and 3 identifiers respectivly, only handle to the dialog is missing the remaining works absolutly fine

Thanks once again for reconfirmation
With best Regards
yqureshi
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LVL 55

Expert Comment

by:Jaime Olivares
ID: 12071586
Don't use SetDlgItemText. You must use the EM_REPLACESEL message.
Select an empty portion at the end of your text control and replace it with a text.

Here is an example in a previous question:
http://www.experts-exchange.com/Programming/Programming_Languages/C/Q_20606978.html
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