视觉工作室2008快递中的错误LNK2019 [英] error LNK2019 in visual studio 2008 express

问题描述

我刚刚开始尝试使用vs2008 express在c ++中创建自己的函数库。



我知道这对专家来说可能是一个简单的问题在那里，但我从一个简单的测试示例开始，看看我是否可以管理。



我已将包含和库文件的路径放入ide编译器。

任何有关我做错的建议都将受到赞赏。提前致谢



如果这有帮助我已经包含了代码:(由于某种原因，提交的问题省略了#include< iostream>）



这是错误信息：

1> functest.obj：错误LNK2019：未解析的外部符号int __cdecl twicenum（int）（？twicenum @@ YAHH函数_main引用@Z

1> C：\ Users \ Bill \ Document'\\Visual Studio 2008 \New folder\testfunclib \Debug \ testfunclib.exe：致命错误LNK1120：1个未解析的外部代码



main（1），header（2）和函数定义（3）模块的代码如下：

.................................................. ..............................................（1）。 ..

// main prg叫做testfunclib

..........



#include< iostream>

#includemyfunclib.h

使用命名空间std;

int main（）

{

int b =两次num（4）;

cout<< b;

}



.....（ 2）................................................ ....................................

头文件myfunclib.h < br $>


// ...命名空间，变量和函数原型到这里









/ *您必须在您想要在图书馆中使用的原型功能之前放置extern * /





extern int twicenum（int）;







（3）............................................... ..............................................

函数定义twicenum.cpp



#includemyfunclib.h

#include< iostream>

使用命名空间std;





int twicenum（int x）;

{

int res;

res = x * 2;

cout<< res;

return（res）;

}









............................ .................................................. ..........

I have just started to try to create my own library of functions in c++, using vs2008 express.

I know this is probably a simple problem to the experts out there but I started with a simple test example to see if I could manage.

I have put the paths to my include and library files into the ide compiler.
Any advice on what I have done wrong will be appreciated. Thanks in advance

I have included the code if this helps: (For some reason the submitted question has omitted #include <iostream>)

This is the error message:
1>functest.obj : error LNK2019: unresolved external symbol "int __cdecl twicenum(int)" (?twicenum@@YAHH@Z) referenced in function _main
1>C:\Users\Bill\Documents\Visual Studio 2008\New folder\testfunclib\Debug\testfunclib.exe : fatal error LNK1120: 1 unresolved externals

code for main (1), header (2) and function definition (3) modules follows:
................................................................................................(1)...
//main prg is called testfunclib
..........

#include <iostream>
#include "myfunclib.h"
using namespace std;
int main()
{
int b=twicenum(4);
cout<<b;
}

.....(2)....................................................................................
Header File myfunclib.h

//… Namespaces, variables, and function prototypes go here




/*You have to put extern before your prototyped function you want to use in your library*/


extern int twicenum(int);



(3).............................................................................................
function definition twicenum.cpp

#include "myfunclib.h"
#include <iostream>
using namespace std;


int twicenum(int x);
{
int res;
res=x*2;
cout<<res;
return (res);
}




........................................................................................

推荐答案

我遇到过同样的问题。这可能会有所帮助：

在编译用C编写的Win32项目时，我遇到了链接器问题。 [ ^ ]

I had the same problem once. This might help :
I have a linker problem when compiling my Win32 project written in C.[^]

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