D:\mytest>cl /c main.cpp
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8168 for 80x86
Copyright (C) Microsoft Corp 1984-1998. All rights reserved.

main.cpp

D:\mytest>link main.obj
Microsoft (R) Incremental Linker Version 6.00.8168
Copyright (C) Microsoft Corp 1992-1998. All rights reserved.

   Creating library debug/mytest.exe and object debug/mytest.exp
main.obj : error LNK2001: unresolved external symbol __imp__MessageBoxA@16
debug/mytest.exe : fatal error LNK1120: 1 unresolved externals

原代码如下：
#include "windows.h"

#pragma  comment(linker,"/subsystem:\"windows\" /entry:\"mainCRTStartup\"")
#pragma  comment(linker,"/out:debug/mytest.exe")

extern "C" _declspec(dllexport) int _stdcall Max(int a, int b)
{
        if(a>=b)return a;
        else
        return b;
}

int main()
{
        MessageBox(NULL,(LPSTR)L"这是一个测试程序",(LPSTR)L"ok",0);
        return 0;
}

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