Question

我最近又开始使用C ++应用程序。我正在使用NetLink for Sockets和Visual Studio进行开发。

我制作了一个小代码，但是我遇到了一些错误。我已经包含了来自NetLink的文件，我添加了ws2_32.lib（在链接器/ general＆amp; as pragma comment中），但我仍然遇到这些错误：

Error   1   error LNK2019: unresolved external symbol "void __cdecl NL::init(void)" (?init@NL@@YAXXZ) referenced in function _main  c:\Users\Joshua\documents\visual studio 2012\Projects\OBPP\OBPP\Main.obj
Error   4   error LNK2019: unresolved external symbol "public: class NL::Socket * __thiscall NL::Socket::accept(void)" (?accept@Socket@NL@@QAEPAV12@XZ) referenced in function "private: virtual void __thiscall OnAccept::exec(class NL::Socket *,class NL::SocketGroup *,void *)" (?exec@OnAccept@@EAEXPAVSocket@NL@@PAVSocketGroup@3@PAX@Z)  c:\Users\Joshua\documents\visual studio 2012\Projects\OBPP\OBPP\Main.obj
Error   6   error LNK2019: unresolved external symbol "public: bool __thiscall NL::SocketGroup::listen(unsigned int,void *)" (?listen@SocketGroup@NL@@QAE_NIPAX@Z) referenced in function _main c:\Users\Joshua\documents\visual studio 2012\Projects\OBPP\OBPP\Main.obj
Error   5   error LNK2019: unresolved external symbol "public: __thiscall NL::SocketGroup::SocketGroup(void)" (??0SocketGroup@NL@@QAE@XZ) referenced in function _main  c:\Users\Joshua\documents\visual studio 2012\Projects\OBPP\OBPP\Main.obj
Error   2   error LNK2019: unresolved external symbol "public: __thiscall NL::Socket::Socket(unsigned int,enum NL::Protocol,enum NL::IPVer,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,unsigned int)" (??0Socket@NL@@QAE@IW4Protocol@1@W4IPVer@1@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@I@Z) referenced in function _main  c:\Users\Joshua\documents\visual studio 2012\Projects\OBPP\OBPP\Main.obj
Error   3   error LNK2019: unresolved external symbol "public: __thiscall NL::Socket::~Socket(void)" (??1Socket@NL@@QAE@XZ) referenced in function _main    c:\Users\Joshua\documents\visual studio 2012\Projects\OBPP\OBPP\Main.obj
Error   7   error LNK1120: 6 unresolved externals   c:\users\joshua\documents\visual studio 2012\Projects\OBPP\Debug\OBPP.exe

我正在使用的代码（只是想尝试接受）：

#include <iostream>

#include "netlink\socket.h"
#include "netlink\socket_group.h"

#pragma comment(lib, "Ws2_32.lib")
#define PORT 30000

class OnAccept: public NL::SocketGroupCmd {
        void exec(NL::Socket* socket, NL::SocketGroup* group, void* reference) {
                NL::Socket* newConnection = socket->accept();
                group->add(newConnection);
            std::cout << "\nConnection " << newConnection->hostTo() << ":" << newConnection->portTo() << " added...";
            std::cout.flush();
    }
};

int main()
{
    NL::init();
    NL::Socket s(PORT);
    NL::SocketGroup group;

    group.setCmdOnAccept(&OnAccept());

    group.add(&s);

    if (group.listen(2000))
    {
            std::cout << "Listening on Sockets, port " << PORT << std::endl;
    }

    getchar();
}

Answer 1

我是图书馆的开发者。它不能仅与头文件一起使用，您需要链接静态/动态编译库。

您必须首先构建库，以生成.lib文件。一旦你构建了netLink.lib文件（或者你的名字），你必须将该依赖项添加到链接器。

Answer 2

我不是视觉工作室开发人员，但错误消息显示unresolved external symbol表示链接器无法找到某些符号。看看你的链接命令是否包含Netlink库？

C ++ NetLink套接字错误

2 个答案: