C++.extern

.h

#pragma once
extern int g_i; /*声明，未分配内存*/
extern "C" int __cdecl fn1(int i, short j); /*extern "C" 即不进行名称粉碎*/
char __stdcall fn2(int i, short j, char c);
short __fastcall fn3(char c, int i, short j);
class A
{
public:
	A() {}
	~A(){}
	int fn4(int i, short j, char c);
};
/************************************************************************/
/* 
?.obj中存储名称粉碎信息
?fn2@@YGDHFD@Z
?fn3@@YIFDHF@Z
?fn4@A@@QAEHHFD@Z
?fn2     名称粉碎
@@YGDHFD 参数信息
@Z       返回值信息
@A       类成员函数则包含类信息

可用C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\undname.exe查看函数声明
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin>undname -f ?fn2@@YGDHFD@Z
Microsoft (R) C++ Name Undecorator
Copyright (C) Microsoft Corporation. All rights reserved.

Undecoration of :- "-f"
is :- "-f"

Undecoration of :- "?fn2@@YGDHFD@Z"
is :- "char __stdcall fn2(int,short,char)"


C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin>undname -f ?fn3@@YIFDHF@Z
Microsoft (R) C++ Name Undecorator
Copyright (C) Microsoft Corporation. All rights reserved.

Undecoration of :- "-f"
is :- "-f"

Undecoration of :- "?fn3@@YIFDHF@Z"
is :- "short __fastcall fn3(char,int,short)"


C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin>undname -f ?fn4@A@@QAEHHFD@Z
Microsoft (R) C++ Name Undecorator
Copyright (C) Microsoft Corporation. All rights reserved.

Undecoration of :- "-f"
is :- "-f"

Undecoration of :- "?fn4@A@@QAEHHFD@Z"
is :- "public: int __thiscall A::fn4(int,short,char)"
*/
/************************************************************************/

.cpp

#include "stdafx.h"
#include "A.h"

int g_i = 0; /*定义，分配内存*/

int fn1(int i, short j)
{
	return i;
}

char __stdcall fn2(int i, short j, char c)
{
	return c;
}

short __fastcall fn3(char c, int i, short j)
{
	return j;
}

int A::fn4(int i, short j, char c)
{
	return i;
}