[Webinar] Streamline your web hosting managementRegister Today

x
?
Solved

Linker Errors on Dialog Box

Posted on 1997-04-19
3
Medium Priority
?
202 Views
Last Modified: 2013-12-04
I am running Borland 4.52 in Win95. I have written windows apps in Turbo C++ before but am trying to learn OWL classes.
There are 2 problems and may be related.
1) I declared a dialog box
class Dialog_1 : public TDialog
{ public:
    Dialog_1(TWindow *parent, TRedId, resId,
             TModule = 0 );
    ~Dialog_1();
}
I execute the dialog box
void SchedMainWindow::cmSched()
{
  if(new Dialog_1(this, ID_PLAYERS)->Execute() == IDOK);
}

The code compliles but gets linker error - undefined symbol Dialog_1::Dialog_1(etc...).
2) Now, I also tried to do a strcat to put a title on the main window title bar. I get an error msg stating the declaration is obsolete. the problems may be related. the includes are correct.
0
Comment
Question by:dutch
  • 2
3 Comments
 
LVL 11

Accepted Solution

by:
mikeblas earned 200 total points
ID: 1334661
Your if statement is just about _the_ most obfuscated C++ I've ever seen.

Anyway, your linker error is because the linker can't find the implementation of your Dialog_1() constructor.  You've either not coded it, or you've not linked to the module which has the implementation in your project.

You probably should ask a separate question for your #2 problem. You'll need to show us your code so we can even guess at what you might've done wrong.

.B ekiM

0
 

Author Comment

by:dutch
ID: 1334662
Your answer did fix my probelm. I'm not sure that the tone of your note is all that helpful. The IF statement you find so confusing is pretty much standard windows code to execute a dialogue box, its right out of the test book. If I submit a second question, I would hope that you do more than guess at the problem since this process costs me points...
0
 
LVL 11

Expert Comment

by:mikeblas
ID: 1334663
I don't find the statement confusing at all; it's just bad C++.  If operator new() returns NULL, your program will crash because you haven't afforded yourself the luxury of handling the situation.

You don't need the if() statement anyway, since you don't have a conditional statement before the semicolon.

.B ekiM

0

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article surveys and compares options for encoding and decoding base64 data.  It includes source code in C++ as well as examples of how to use standard Windows API functions for these tasks. We'll look at the algorithms — how encoding and decodi…
For most people, the WrapPanel seems like a magic when they switch from WinForms to WPF. Most of us will think that the code that is used to write a control like that would be difficult. However, most of the work is done by the WPF engine, and the W…
This is Part 3 in a 3-part series on Experts Exchange to discuss error handling in VBA code written for Excel. Part 1 of this series discussed basic error handling code using VBA. http://www.experts-exchange.com/videos/1478/Excel-Error-Handlin…
The video provides a quick and easy steps to migrate MBOX file to well known Outlook PST and Office 365. Besides this, it also supports and migrates more than 20 email clients of MBOX which include AppleMail, Opera, Thunderbird and SeaMonkey effortl…

591 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