"redefinition; different type modifier" in VS2010

c++ visual-c++ asio
brneuro picture brneuro · Mar 3, 2012 · Viewed 16.2k times · Source

I'm trying to compile some code I downloaded in visual studio. The code was intended for msvc 6, and I imported it to VS2010. The code is for providing ASIO support for labview by compiling a DLL. see here for the whole code.

I get the following error when building: "error C2373:'_pctype' : redefinition; different type modifiers."

The code snippet is as follows:

unsigned short _Ints[ 512 ];
unsigned short *_pctype = _Ints;

If anyone will be referencing the package of code from the link I provided, this is from the file GenMonCIN.c

Answer

fredoverflow picture fredoverflow · Mar 3, 2012

The error message is trying to tell you that _pctype was already defined somewhere else.

It appears that _pctype is an identifier used by Visual Studio since at least version 2005.

_pctype, _pwctype, _wctype, _mbctype, _mbcasemap

These global variables contain information used by the character classification functions. They are for internal use only.

Please never pick names with a leading underscore at namespace scope, they are reserved for the implementation. The person who wrote the library obviously didn't know that, and now you're screwed.

Related questions

Unresolved external symbol in object files

During coding in Visual Studio I got an unresolved external symbol error and I've got no idea what to do. I don't know what's wrong. Could you please decipher me? Where should I be looking for what kind of errors? 1&…

Read More
How to determine if a string is a number with C++?

I've had quite a bit of trouble trying to write a function that checks if a string is a number. For a game I am writing I just need to check if a line from the file I am reading …

Read More
Why is this program erroneously rejected by three C++ compilers?

I am having some difficulty compiling a C++ program that I've written. This program is very simple and, to the best of my knowledge, conforms to all the rules set forth in the C++ Standard. I've read over the entirety …

Read More