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Asked: 2026-05-30T17:18:36+00:00

I’m trying to compile some code I downloaded in visual studio. The code was

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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

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1 Answer

  1. Editorial Team

    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.

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