Solved

Unresolved external  symbol

Posted on 1998-04-16
10
549 Views
Last Modified: 2013-12-03
I get the unresolved external symbol error message when trying to build my program.
 
 unresolved external symbol _Process32Next@8
 unresolved external symbol _Process32First@8
 unresolved external symbol _CreateToolhelp32Snapshot@8

From the code section:-
void Snap()
      {
      HWND hSnap;

      hSnap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);

    if (hSnap ==(HANDLE) -1)
      {
            MessageBox();
      }
      else
      {
            PROCESSENTRY32 procEntry;
            procEntry.dwSize = sizeof(PROCESSENTRY32);

            if (!Process32First(hSnap, &procEntry))
            {
                  //this can't possibly happen
                  MessageBox();
                  assert(FALSE);
            }
            else
            {
                  BOOL bResult;
                        do
                  {
                  
                  bResult = Process32Next(hSnap, &procEntry);
                  } while (bResult);
            }
            CloseHandle(hSnap);
      }
      }
0
Comment
Question by:gnik
  • 4
  • 3
  • 3
10 Comments
 
LVL 22

Expert Comment

by:nietod
ID: 1412819
You need to include the tlhelp32.h file.
0
 
LVL 22

Expert Comment

by:nietod
ID: 1412820
Note that these functions are only available in windows 95.  That is why the file is not automatically included.  
0
 

Author Comment

by:gnik
ID: 1412821
I should have said, tlhelp32.h has been included and it is on windows 95.
0
Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

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.

 
LVL 11

Expert Comment

by:alexo
ID: 1412822
You need to add the library TH32.LIB to your linker settins (list of libraries).
Note that "Unresolved external symbol" is a linker error and cannot be resolved by include files.
0
 

Author Comment

by:gnik
ID: 1412823
how do you go about adding libraries to your linker settings?
0
 
LVL 22

Expert Comment

by:nietod
ID: 1412824
Alexo is right of course.  I don't know what I was thinking.

In Microsoft VC+, choose "Project"->"Add to Project"->"Files".  Then add the .lib file.

In Borland C++ there is a similar option, but I don't know the details.

In Builder.  You open up the project manager andn right click on the project then select "add" and add the .lib file.
0
 
LVL 11

Expert Comment

by:alexo
ID: 1412825
>> I don't know what I was thinking.
About defwnd.c perchance?
0
 
LVL 22

Expert Comment

by:nietod
ID: 1412826
Hey, I resent that.  You are suggesting that I have a one-track mind.  Nothing could be further from the truth.  In fact I have som many things on my mind that...what was I saying?
0
 

Author Comment

by:gnik
ID: 1412827
I am going to reopen this question so that I can grade alexo's answer.
Thanks for the help. The problem's sorted.
0
 
LVL 11

Accepted Solution

by:
alexo earned 30 total points
ID: 1412828
Thank you.
0

Featured Post

Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

Question has a verified solution.

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

A theme is a collection of property settings that allow you to define the look of pages and controls, and then apply the look consistently across pages in an application. Themes can be made up of a set of elements: skins, style sheets, images, and o…
Whether you've completed a degree in computer sciences or you're a self-taught programmer, writing your first lines of code in the real world is always a challenge. Here are some of the most common pitfalls for new programmers.
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…
Email security requires an ever evolving service that stays up to date with counter-evolving threats. The Email Laundry perform Research and Development to ensure their email security service evolves faster than cyber criminals. We apply our Threat…

860 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