链接器错误 LNK2001

Linker error LNK2001(链接器错误 LNK2001)

问题描述

当我尝试创建一个对象时，我在 Visual Studio 中收到 LNK2001 错误，我认为这是构造函数的问题，因为更改构造函数会更改错误.

When I try to create an object I get a LNK2001 error in Visual Studio, it's a problem with the constructor I think since changing the constructor changes the error.

Customer bob("Bob", "25 Bob Lane", "01bob82", "M", "bob/bob/bob");

这一行给出了这个错误:

This line gives this error:

Error   1   error LNK2001: unresolved external symbol "public: __thiscall
Customer::Customer(class std::basic_string<char,struct std::char_traits<char>,class
std::allocator<char> >,class std::basic_string<char,struct std::char_traits<char>,class
std::allocator<char> >,class std::basic_string<char,struct std::char_traits<char>,class 
std::allocator<char> >,class std::basic_string<char,struct std::char_traits<char>,class
std::allocator<char> >,class std::basic_string<char,struct std::char_traits<char>,class
std::allocator<char> >)" (??0Customer@@QAE@V?$basic_string@DU?$char_traits@D@V?
$allocator@DZ)    D:DropboxWorkC++C++ AssignmentC++ 
Assignmentdriver.obj

包含构造函数的客户类:

Customer class that contains the constructor:

#pragma once
#include "l_list.h"
#include "Account.h"
#include <string>

using namespace std;

class Customer
{
private:
    l_list<Account> accounts;
    string name;
    string address;
    string telNo;
    string sex;
    string dob;

public:
    Customer(string name, string address, string telNo, string sex, string dob)
    {
        Customer::name = name;
        Customer::address = address;
        Customer::telNo = telNo;
        Customer::sex = sex;
        Customer::dob = dob;
    }

    void createAccount()
    {
        cout << "What type of account?";

    }

};

推荐答案

如果你有链接错误，那么你的代码在语法上没有问题，否则你会得到编译器错误.

If you have linking error then syntactically your code is OK otherwise you'll get compiler errors.

您应该检查(或添加)的是使用 Customer 类的项目的 Dependencies 属性中的路径.在VS中，您可以找到项目属性->配置属性->链接器->输入->附加依赖项".似乎链接器找不到带有客户实现的外部库.您可以成功编译您的项目，因为所有#include 都是正确的，但您只是因为依赖关系而在链接阶段失败.

What you should check(or add) is path in Dependencies property of the project that uses Customer class. In VS you can find it "Project Properties->Configuration Properties->Linker->Input->Additional Dependencies". Seems that linker can't find the external library with Customer implementation. You can successfully compile your project cause all #include are correct but you fail on the stage of linking just because of dependencies.

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