Incuding C++ header files in C, VS 2010

I want to write a C code, say "test.c" call some C++ functions from it.I have a header file header.h which has function defined in it and a C++ file which has definitions of functions.I'm unable to figure out compilation commands and how to use extern command. Can someone clarify this?
Thanks in advance,
Neerad

Read this FAQ: How to mix C and C++

Hey, thanks. I have gone through that already but I couldn't find any instructions for compiling the code

Well, can you just compile your project as C++?

Quote:

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Originally Posted by neeraddevil

Hey, thanks. I have gone through that already but I couldn't find any instructions for compiling the code

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insert

Code:

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#ifdef __cplusplus
extern "C"
{
#endif
  void foo (void);
#ifdef __cplusplus
};
#endif


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Then I implement foo() in .cpp file. I also include .h in .cpp
and it worked. But the problem is I can't define any classes in header file after I do this. If the classes are in .cpp file, it works

Do you need C++ classes to be defined in the header file in the first place?

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Originally Posted by laserlight

Do you need C++ classes to be defined in the header file in the first place?

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I use header file given by another program.
I can define classes when we use c++ code right?
Y can't we do that when we use extern?

Quote:

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Originally Posted by neeraddevil

I can define classes when we use c++ code right?
Y can't we do that when we use extern?

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Classes don't exist as a language feature in C. It is not a matter of linkage, which is what the use of extern is about. One does not simply define a class in a header and include it in a C source file and expect it to compile.

Quote:

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Originally Posted by laserlight

Classes don't exist as a language feature in C. It is not a matter of linkage, which is what the use of extern is about. One does not simply define a class in a header and include it in a C source file and expect it to compile.

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Ok. Thanks for the info :)

Quote:

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Originally Posted by laserlight

One does not simply define a class in a header and include it in a C source file and expect it to compile.

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I see what you did there, intentionally or not! :D