Re: problems calling a function contained in a dll

From:

"Igor Tandetnik" <itandetnik@mvps.org>

Newsgroups:

microsoft.public.vc.language

Date:

Thu, 26 Oct 2006 14:56:32 -0400

Message-ID:

<#ozW1BT#GHA.2300@TK2MSFTNGP04.phx.gbl>

Alan <alan_ball007@yahoo.co.uk> wrote:

     ANT_Init = (_ANT_Init)GetProcAddress(hDLLInstance, "_ANT_Init");
     if (ANT_Init(0, 50000) == true)
     {
        printf("Success: ANT Initialized Properly\n");
     }
     else
     {
        printf("Fail: ANT Interface not found\n");
     }

Whenever my program crashes, I get the following error message
"Unhandled exception at 0x00000000 in program.exe: 0xC0000005: Access
violation reading location 0x00000000."

Most likely, GetProcAddress failed and returned NULL. You are not
checking for this but just trying to call the function.

Use Dependency Walker (www.dependencywalker.com) to check whether the
DLL does indeed export a function named "_ANT_Init".
--
With best wishes,
Igor Tandetnik

With sufficient thrust, pigs fly just fine. However, this is not
necessarily a good idea. It is hard to be sure where they are going to
land, and it could be dangerous sitting under them as they fly
overhead. -- RFC 1925