Solved

Using huge CString and CEdit: limit 64K ?

Posted on 2002-03-31
3
573 Views
Last Modified: 2013-11-20
Hi there !

I have a small dlg-based app that connects to an internet server, gets some txt-output from there and displays it in a CEdit control. By clicking a button, i use this code fragment to receive and display the data (i got this code from some experts-exchange post):

----------
HCURSOR hCursOld = SetCursor(LoadCursor(NULL, IDC_WAIT));
m_cStartButton.EnableWindow(FALSE);

CInternetSession* pInternetSession;
pInternetSession = new CInternetSession();
     
m_sDataEdit.Empty();  // this is a CString, attached to a CEdit control of my dlg

CHttpFile* pFile = (CHttpFile*)pInternetSession->OpenURL("http://www.somewhere.com/returntxt.php",1,INTERNET_FLAG_TRANSFER_BINARY | INTERNET_FLAG_DONT_CACHE | INTERNET_FLAG_RELOAD,NULL,0);

if ( pFile )
{
 char buf[256];
 while( int iRead = pFile->Read( buf, 255 ) )
 {
   buf[iRead] = '\0';
   m_sDataEdit += CString(buf);
 }
         
 pFile->Close();
 delete pFile;
}

pInternetSession->Close();
delete pInternetSession;

m_cStartButton.EnableWindow(TRUE);
UpdateData(FALSE);

SetCursor(hCursOld);
----------

This totally works with W2K, and I receive some huge data (ab 70k) and show it. But, with W98, the program crashes or just shows nothing.
As far as I checked, the data is received, but as I extend 64k of data (chars), the CString ("m_sDataEdit") has some "overrun" or whatever and gets lost.

Can u help me ?
Why is there a difference between W2K and W98 on this issue ? I understand that CEdit control has some memory limit (4k ? 32k?), anyway. Do i need a totally different approach for showing "huge" text within a dialog app ?

THX a lot
0
Comment
Question by:MiKo93
3 Comments
 
LVL 23

Expert Comment

by:Roshan Davis
Comment Utility
Try this link...

http://codeproject.com/editctrl/crysedit.asp

this may help u...

GOOD LUCK
0
 
LVL 49

Accepted Solution

by:
DanRollins earned 200 total points
Comment Utility
The EDIT control managed by the CEdit class is not able to handle or display text greater than 64K.

There are two basic choices:
1) truncate the text.
2) Use CRichEdit class rather than CEdit.

If you use #2, then be sure to execute this fn sometime before you open the dialog box:

   AfxInitRichEdit();

In a dilaog-based app, this is commonly placed into the CMyApp.InitInstance() fn, just before that call to dlg.DoModal().

Do you need help in changing your existing CEdit control into a CRichEdit control?

-- Dan
0
 

Author Comment

by:MiKo93
Comment Utility
Thank you both for your comments.

Dan, I used #2 and rebuilt with a CRichEdit, and it worked ! Therefore, I'll accept your comment as answer.

Yours, MiKo
0

Featured Post

How to improve team productivity

Quip adds documents, spreadsheets, and tasklists to your Slack experience
- Elevate ideas to Quip docs
- Share Quip docs in Slack
- Get notified of changes to your docs
- Available on iOS/Android/Desktop/Web
- Online/Offline

Join & Write a Comment

Suggested Solutions

Title # Comments Views Activity
Change owner from userA to server Local Administrators 7 51
countEvens challenge 2 57
modThree challenge 4 64
Change to event 1 72
Introduction: Database storage, where is the exe actually on the disc? Playing a game selected randomly (how to generate random numbers).  Error trapping with try..catch to help the code run even if something goes wrong. Continuing from the seve…
Introduction: Dialogs (1) modal - maintaining the database. Continuing from the ninth article about sudoku.   You might have heard of modal and modeless dialogs.  Here with this Sudoku application will we use one of each type: a modal dialog …
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
Excel styles will make formatting consistent and let you apply and change formatting faster. In this tutorial, you'll learn how to use Excel's built-in styles, how to modify styles, and how to create your own. You'll also learn how to use your custo…

743 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

17 Experts available now in Live!

Get 1:1 Help Now