在Visual Studio中编码时,我得到了一个未解决的外部符号错误 我不知道该怎么办我不知道怎么了。 你能帮我破译一下吗?我应该在哪里寻找什么样的错误?

1>Form.obj : error LNK2019: unresolved external symbol "public: class Field * __thiscall Field::addField(class Field *)" (?addField@Field@@QAEPAV1@PAV1@@Z) referenced in function "public: void __thiscall Form::parse(class std::basic_stringstream<char,struct std::char_traits<char>,class std::allocator<char> > &)" (?parse@Form@@QAEXAAV?$basic_stringstream@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)
1>Form.obj : error LNK2019: unresolved external symbol "public: virtual void __thiscall Field::parse(class std::basic_stringstream<char,struct std::char_traits<char>,class std::allocator<char> > &)" (?parse@Field@@UAEXAAV?$basic_stringstream@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z) referenced in function "public: __thiscall InputField::InputField(class std::basic_stringstream<char,struct std::char_traits<char>,class std::allocator<char> > &)" (??0InputField@@QAE@AAV?$basic_stringstream@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)
1>Form.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall Field::prompt(void)" (?prompt@Field@@UAEXXZ)
1>Form.obj : error LNK2001: unresolved external symbol "public: virtual class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __thiscall Field::getName(void)" (?getName@Field@@UAE?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@XZ)
1>Form.obj : error LNK2001: unresolved external symbol "public: virtual class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __thiscall Field::getType(void)" (?getType@Field@@UAE?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@XZ)
1>Form.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall Field::describe(void)" (?describe@Field@@UAEXXZ)
1>C:\Users\tomy\Documents\Visual Studio 2010\Projects\zapoctovkac++\Debug\zapoctovkac++.exe : fatal error LNK1120: 6 unresolved externals

当前回答

我有一个错误,我的项目被编译为x64项目。我使用的库是x86编译的。

我重新编译了x64库,它解决了这个问题。

其他回答

我的问题是:我必须对一个“外部未解决”的课程做前向声明。

在我得到错误的文件中,我必须放这样的东西:

#include "ClassB" 

class ClassB; // this solved the problem

class ClassA{
    void foo(){
        ClassB* tmp = new ClassB();
        // ...
    }
};

当然,我的项目要复杂得多,这只是一个片段示例。同样,在使用名称空间时,也要声明它们。

I believe most of the points regarding the causes and remedies have been covered by all contributors in this thread. I just want to point out for my 'unresolved external' problem, it was caused by a datatype defined as macro that gets substituted differently than expected, which results in that incorrect type being supplied to the function in question, and since the function with type is never defined, it couldn't have been resolved. In particular, under C/C++ -> Language, there is an attribute called 'Treat WChar_t As Built in Type, which should have been defined as 'No (/Zc:wchar_t-)' but did not in my case.

确保您没有试图将插入或提取操作符作为内联函数重载。我有这个问题,它只消失了,当我删除了那个关键字。

检查是否包含了您所引用的解决方案中的所有源文件。

如果你没有在项目中包含Field类的源文件(以及实现),它将不会被构建,你将无法在编译期间进行链接。

或者,也许您正在使用静态或动态库,并且忘记告诉链接器有关.lib的信息?

这是另一种检查的可能性,这次是我的问题。

我已经将函数添加到库中,并将库的输出文件夹包含在搜索路径中。

但是我也有一个文件夹,里面有之前列出的旧版本的库,所以VS使用的是旧的库,当然没有找到新函数。