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LNK2019 when build in Visual Studio 2017 #10

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kxu-ffd opened this issue Jul 28, 2018 · 11 comments
Open

LNK2019 when build in Visual Studio 2017 #10

kxu-ffd opened this issue Jul 28, 2018 · 11 comments

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@kxu-ffd
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kxu-ffd commented Jul 28, 2018

Hi, I am trying your solution to stream OpenCV processed images from one computer to another. However, I am stuck at the build step. It seems the VS compiler is not able to link the functions in TCPServerSocket. No issue during the cmake. I tried to modify the CMakeLists.txt to explicitly include the header files, but it does not work. Strangely, I am able to build the project in Ubuntu. The attached is the error log from VS 2017.

PracticalSocket.obj : error LNK2019: unresolved external symbol accept referenced in function "public: class TCPSocket * __cdecl TCPServerSocket::accept(void)" (?accept@TCPServerSocket@@QEAAPEAVTCPSocket@@xz)
2>PracticalSocket.obj : error LNK2019: unresolved external symbol bind referenced in function "public: void __cdecl Socket::setLocalPort(unsigned short)" (?setLocalPort@Socket@@QEAAXG@Z)
2>PracticalSocket.obj : error LNK2019: unresolved external symbol closesocket referenced in function "public: __cdecl Socket::~Socket(void)" (??1Socket@@qeaa@XZ)
2>PracticalSocket.obj : error LNK2019: unresolved external symbol connect referenced in function "public: void __cdecl CommunicatingSocket::connect(class std::basic_string<char,struct std::char_traits,class std::allocator > const &,unsigned short)" (?connect@CommunicatingSocket@@QEAAXAEBV?$basic_string@DU?$char_traits@D@std@@v?$allocator@D@2@@std@@g@Z)
2>PracticalSocket.obj : error LNK2019: unresolved external symbol getpeername referenced in function "public: class std::basic_string<char,struct std::char_traits,class std::allocator > __cdecl CommunicatingSocket::getForeignAddress(void)" (?getForeignAddress@CommunicatingSocket@@qeaa?AV?$basic_string@DU?$char_traits@D@std@@v?$allocator@D@2@@std@@xz)
3>Generating Code...
2>PracticalSocket.obj : error LNK2019: unresolved external symbol getsockname referenced in function "public: class std::basic_string<char,struct std::char_traits,class std::allocator > __cdecl Socket::getLocalAddress(void)" (?getLocalAddress@Socket@@qeaa?AV?$basic_string@DU?$char_traits@D@std@@v?$allocator@D@2@@std@@xz)
2>PracticalSocket.obj : error LNK2019: unresolved external symbol htonl referenced in function "public: void __cdecl Socket::setLocalPort(unsigned short)" (?setLocalPort@Socket@@QEAAXG@Z)
2>PracticalSocket.obj : error LNK2019: unresolved external symbol htons referenced in function "public: void __cdecl Socket::setLocalPort(unsigned short)" (?setLocalPort@Socket@@QEAAXG@Z)
2>PracticalSocket.obj : error LNK2019: unresolved external symbol inet_addr referenced in function "public: void __cdecl UDPSocket::joinGroup(class std::basic_string<char,struct std::char_traits,class std::allocator > const &)" (?joinGroup@UDPSocket@@QEAAXAEBV?$basic_string@DU?$char_traits@D@std@@v?$allocator@D@2@@std@@@z)
2>PracticalSocket.obj : error LNK2019: unresolved external symbol inet_ntoa referenced in function "public: class std::basic_string<char,struct std::char_traits,class std::allocator > __cdecl Socket::getLocalAddress(void)" (?getLocalAddress@Socket@@qeaa?AV?$basic_string@DU?$char_traits@D@std@@v?$allocator@D@2@@std@@xz)
2>PracticalSocket.obj : error LNK2019: unresolved external symbol listen referenced in function "private: void __cdecl TCPServerSocket::setListen(int)" (?setListen@TCPServerSocket@@AEAAXH@Z)
2>PracticalSocket.obj : error LNK2019: unresolved external symbol ntohs referenced in function "public: unsigned short __cdecl Socket::getLocalPort(void)" (?getLocalPort@Socket@@QEAAGXZ)
2>PracticalSocket.obj : error LNK2019: unresolved external symbol recv referenced in function "public: int __cdecl CommunicatingSocket::recv(void *,int)" (?recv@CommunicatingSocket@@QEAAHPEAXH@Z)
2>PracticalSocket.obj : error LNK2019: unresolved external symbol recvfrom referenced in function "public: int __cdecl UDPSocket::recvFrom(void *,int,class std::basic_string<char,struct std::char_traits,class std::allocator > &,unsigned short &)" (?recvFrom@UDPSocket@@QEAAHPEAXHAEAV?$basic_string@DU?$char_traits@D@std@@v?$allocator@D@2@@std@@aeag@Z)
2>PracticalSocket.obj : error LNK2019: unresolved external symbol send referenced in function "public: void __cdecl CommunicatingSocket::send(void const *,int)" (?send@CommunicatingSocket@@QEAAXPEBXH@Z)
2>PracticalSocket.obj : error LNK2019: unresolved external symbol sendto referenced in function "public: void __cdecl UDPSocket::sendTo(void const *,int,class std::basic_string<char,struct std::char_traits,class std::allocator > const &,unsigned short)" (?sendTo@UDPSocket@@QEAAXPEBXHAEBV?$basic_string@DU?$char_traits@D@std@@v?$allocator@D@2@@std@@g@Z)
2>PracticalSocket.obj : error LNK2019: unresolved external symbol setsockopt referenced in function "public: void __cdecl UDPSocket::setMulticastTTL(unsigned char)" (?setMulticastTTL@UDPSocket@@QEAAXE@Z)
2>PracticalSocket.obj : error LNK2019: unresolved external symbol socket referenced in function "protected: __cdecl Socket::Socket(int,int)" (??0Socket@@iEAA@HH@Z)
2>PracticalSocket.obj : error LNK2019: unresolved external symbol gethostbyname referenced in function "void __cdecl fillAddr(class std::basic_string<char,struct std::char_traits,class std::allocator > const &,unsigned short,struct sockaddr_in &)" (?fillAddr@@YAXAEBV?$basic_string@DU?$char_traits@D@std@@v?$allocator@D@2@@std@@GAEAUsockaddr_in@@@z)
2>PracticalSocket.obj : error LNK2019: unresolved external symbol getservbyname referenced in function "public: static unsigned short __cdecl Socket::resolveService(class std::basic_string<char,struct std::char_traits,class std::allocator > const &,class std::basic_string<char,struct std::char_traits,class std::allocator > const &)" (?resolveService@Socket@@SAGAEBV?$basic_string@DU?$char_traits@D@std@@v?$allocator@D@2@@std@@0@Z)
2>PracticalSocket.obj : error LNK2019: unresolved external symbol WSAStartup referenced in function "protected: __cdecl Socket::Socket(int,int)" (??0Socket@@iEAA@HH@Z)
2>PracticalSocket.obj : error LNK2019: unresolved external symbol WSACleanup referenced in function "public: static void __cdecl Socket::cleanUp(void)" (?cleanUp@Socket@@Saxxz)
@chenxiaoqino
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chenxiaoqino commented Jul 28, 2018 via email

@email2jie
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Looks like practical socket already uses winsock in the Socket superclass if WIN32 is defined.

@chenxiaoqino
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chenxiaoqino commented Jul 30, 2018 via email

@email2jie
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It may have to do with something is not working well with x64. I tried compiling this for windows in Visual Studios, at first it was just saying my target machine was x86. But after I changed the target machine it started to not recognize the functions. Do you know if practical socket works on x64 bit machines?

@chenxiaoqino
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chenxiaoqino commented Jul 30, 2018 via email

@email2jie
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Looks like it needs to link different libraries and uses different dlls... https://docs.microsoft.com/en-us/windows/desktop/winsock/creating-a-basic-winsock-application

tried it out and it works now

@v-prgmr
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v-prgmr commented Sep 23, 2019

@email2jie , hi , could you share what you tried out and made it work?
Thank you

@BrieoRobino
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Any plans on updating this to build in windows?

@chenxiaoqino
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chenxiaoqino commented Oct 3, 2019 via email

@AlexYiningLiu
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Looks like it needs to link different libraries and uses different dlls... https://docs.microsoft.com/en-us/windows/desktop/winsock/creating-a-basic-winsock-application

tried it out and it works now

@jweiA10 How did you get it working on Windows? Can you please share your steps? Thanks.

@fstojanovic
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fstojanovic commented Oct 6, 2020 •
edited
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If anybody is wondering, for Windows, the easiest method is to replace, in PracticalSocket.cpp :

#include <winsock.h>         // For socket(), connect(), send(), and recv()

by :

#ifdef WIN32
  #include <WinSock2.h>         // For socket(), connect(), send(), and recv()
  #include <Ws2tcpip.h>
  #pragma comment(lib, "Ws2_32.lib")

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@chenxiaoqino @BrieoRobino @email2jie @kxu-ffd @v-prgmr @AlexYiningLiu @fstojanovic