Accessing Edit Box content (MFC)

[kartoffel]

Hi

I inserted an edit box in a Dialog, using the Ressource editor. The user can write some text in the edit box and I want to access the content.

From within my Dialog CPP file (say Dialog.cpp) I wrote the following to access each line of the edit box:

for()
{
...
GetDlgItem(IDC_MY_EDITBOX)->GetLine();
...
}

When I compile, I get an error saying that GetLine is not a member of CWnd. How come my edit box is not a CEdit object?

Thanks

 

[cra]

> How come my edit box is not a CEdit object?

it *is*, but GetDlgItem() always returns a pointer to the base class CWnd regardless of the dialog item type.

A quick&dirty way to do it is to cast the pointer:

((CEdit*)GetDlgItem(IDC_MY_EDITBOX))->GetLine();

 

[kartoffel]

Thanks for the tip cra.

But now it seems I have another problem. When I try to retrieve each line of the edit box, I get empty strings!

Here is my code (inspired from an MSDN example)

=======================================
CString strCurrentLine, strLine;
CEdit* pmyEdit = (CEdit*)GetDlgItem(IDC_MY_EDITBOX);
int i, nLineCount = pmyEdit->GetLineCount();

// Dump every line of text of the edit control.
for (i=0;i < nLineCount;i++)
{
pmyEdit->GetLine(i,
strCurrentLine.GetBuffer(pmyEdit->LineLength(i)));
strCurrentLine.ReleaseBuffer();

strLine.Format(TEXT(&quot;line %d: '%s'\r\n&quot, i, strCurrentLine.GetBuffer(0));

MessageBox(strLine, _T(&quot;FileName&quot, MB_ICONINFORMATION);
}
==============================
In the message box, I always get something like:

Line 0: ''
Line 1: '', etc.
when there actually is some text in the edit box.

What am I doing wrong here?

Thanks

 

[cra]

I think the problem is the LineLength() function. It takes an index to a character, not a line.

Try pmyEdit->LineLength(pmyEdit->LineIndex(i)).

I think the names of these two functions are confusing & misleading :-(

Hope that helped...

 

[kartoffel]

hmmm... still doesn't work

I really dont know what the problem is...

Thanks anyway for your help!

 

[cra]

Very strange, it works for me... However there was another bug in it: ReleaseBuffer() needs the string length or a previously larger string will remain in the buffer.

I use:

int len = pmyEdit->LineLength(pmyEdit->LineIndex(i));
pmyEdit->GetLine(i,strCurrentLine.GetBuffer(len));
strCurrentLine.ReleaseBuffer(len);

and it works perfectly!