iOS开发之OC和C混编问题

最近做的项目导入环信平台在编译时报下面的错误

Undefined symbols for architecture i386:

  "_fwrite$UNIX2003", referenced from:

      _hex_dump_internal in libEaseMobClientSDK.a(dump.o)

      _pkt_dump_internal in libEaseMobClientSDK.a(dump.o)

ld: symbol(s) not found for architecture i386

查了一下是OC和C冲突的问题

解决办法：

AppDelegate.m改为AppDelegate.mm

再AppDelegate.mm在加上如下代码

extern"C"{

    size_t fwrite$UNIX2003(const void *a,size_t b, size_t c,FILE *d )

    {

        returnfwrite(a, b, c, d);

    }

    char* strerror$UNIX2003(int errnum )

    {

        returnstrerror(errnum);

    }

}