C ++链接错误

Question

I compile in Visual studio 2008 and get this error. I have researched linkage error but am still uncertain to what it is. This is the finished code to a poker game so I would rather not post the code. Can someone translate this error message for me?

error LNK2019: unresolved external symbol " void __cdecl betFold(double) " (?betFold@@YAXN@Z) referenced in function " void __cdecl flopAction(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >) " ( ?flopAction@@YAXV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z ) OH-DLL.obj

Answer 1

It means that you have declared this method but not defined it. Or at least the linker cannot find the definition, either because it's in a library that you didn't reference or else because it's in an object file (source file) that is not part of your build process.

Answer 2

您的函数void flopAction(std::string arg)使用了betFold(double)函数，该函数在某些标头中被引用和声明，但未实现，因此链接程序可以找到它。

Answer 3

Sound like you forgot to specify the *.lib file that belongs to the *.dll. You can edit the list under your Project Property Pages -> Configuration properties -> Linker -> Input, remember to do this for the Debug and Release configuration.

And please try to refrain from phrases like wtf etc :)

Answer 4

Also, you could check your signature(function declaration), so that it contains only the type in it's parameter lists, while inside the definition(.cpp file), it contains both the type and parameter names. For eg,

in the .h file where the declaration sits:

void myfunc(int, char*);

and in the .cpp file where the definition sits:

void myfunc(int num, char* name)
{
 //
}

I learnt this before in my college, but don't sure if Dev C++ supports it, left this things for a long time ago, just using Borland at that time.

hope this helps. thanks.