Resolves errors such as unresolved external symbol "int __cdecl addInC1 (void)" ("addinc1@ @YAHXZ)" When C + + calls to function __jquery

Directly in the CPP write #include "c.h" reference to the C header file will be connected when this error occurs: Cpp.obj:error lnk2001:unresolved external symbol "int __cdecl Add (int,int) "([email=?add@ @YAHHH @z]?add@ @YAHHH @z[/email]), the root cause is that C + + and C differ in the way that functions are named.

C to the function name: _add

C + + On the name of the function: =?add@ @YAHHH @z

Solution: Do not modify the original C header file on the basis of the CPP file inside the extern "C" {#include "c.h"}, extern "C" {} means to interpret the code in C, so that c.h inside the code and functions are interpreted as C form. or modify the original C header file:

#ifdef __cplusplus
extern "C"
{
#endif

/*all of your code in here*/

#ifdef __cplusplus
}
#endif

Example:

C1.h:

#ifndef C1_h
#define C1_h

int addInC1 ();
#endif

C2.h

#ifndef C2_h
#define C2_h
#ifdef __cplusplus
extern "C"
{
#endif
int addInC2 ();

#ifdef __cplusplus
}
#endif
#endif

Cpp.cpp:

#include "C1.h"
#include "C2.h"

int main ()
{
int t1=addinc1 ();
int T2=addinc2 ();

};

Error

1 >cpp.obj:error lnk2019:unresolved external symbol _ADDINC2 referenced in function _main
2>cpp.obj:error lnk2019:unresolved external symbol "int __cdecl addInC1 (void)" (? addinc1@ @YAHXZ) referenced in funct Ion _main

Error 1 Cannot find C function _addinc2, error 2 is unable to find C + + function (? addinc1@ @YAHXZ).

Resolve Error 2:

Modify #include "C1.h"

To

extern "C"
{
#include "C1.h"
}

Resolve Error 1: Add a c2.c file to implement the addInC2. Add a c1.c file to achieve addInC1.

Reference: http://www.cnblogs.com/kenkofox/archive/2009/11/05/1597053.html