unresolved external symbol ved socket bruk

-kga- · 17. juni 2007

EDIT: NYTT SPØRSMÅL/PROBLEM..... nedefor.

Holder på og se litt på bruk av winsock, akkuratt starta og snuse litt på det. Så har jeg ett problem, får det både på små koder jeg skrev selv, og får det på koder jeg bare limte inn også.

Feks. denne, som jeg limte inn.

headre file

Klikk for å se/fjerne innholdet nedenfor

/*

Socket.h

This source code is provided 'as-is', without any express or implied

warranty. In no event will the author be held liable for any damages

arising from the use of this software.

Permission is granted to anyone to use this software for any purpose,

including commercial applications, and to alter it and redistribute it

freely, subject to the following restrictions:

1. The origin of this source code must not be misrepresented; you must not

claim that you wrote the original source code. If you use this source code

in a product, an acknowledgment in the product documentation would be

appreciated but is not required.

2. Altered source versions must be plainly marked as such, and must not be

misrepresented as being the original source code.

3. This notice may not be removed or altered from any source distribution.

René Nyffenegger [email protected]

*/

#ifndef SOCKET_H

#define SOCKET_H

#include <WinSock2.h>

#include <string>

enum TypeSocket {BlockingSocket, NonBlockingSocket};

class Socket {

public:

virtual ~Socket();

Socket(const Socket&);

Socket& operator=(Socket&);

std::string ReceiveLine();

std::string ReceiveBytes();

void Close();

// The parameter of SendLine is not a const reference

// because SendLine modifes the std::string passed.

void SendLine (std::string);

// The parameter of SendBytes is a const reference

// because SendBytes does not modify the std::string passed

// (in contrast to SendLine).

void SendBytes(const std::string&);

protected:

friend class SocketServer;

friend class SocketSelect;

Socket(SOCKET s);

Socket();

SOCKET s_;

int* refCounter_;

private:

static void Start();

static void End();

static int nofSockets_;

};

class SocketClient : public Socket {

public:

SocketClient(const std::string& host, int port);

};

class SocketServer : public Socket {

public:

SocketServer(int port, int connections, TypeSocket type=BlockingSocket);

Socket* Accept();

};

// http://msdn.microsoft.com/library/default....apiref_2tiq.asp

class SocketSelect {

public:

SocketSelect(Socket const * const s1, Socket const * const s2=NULL, TypeSocket type=BlockingSocket);

bool Readable(Socket const * const s);

private:

fd_set fds_;

};

#endif

cpp fila til header

Klikk for å se/fjerne innholdet nedenfor

/*

Socket.cpp

This source code is provided 'as-is', without any express or implied

warranty. In no event will the author be held liable for any damages

arising from the use of this software.

Permission is granted to anyone to use this software for any purpose,

including commercial applications, and to alter it and redistribute it

freely, subject to the following restrictions:

1. The origin of this source code must not be misrepresented; you must not

claim that you wrote the original source code. If you use this source code

in a product, an acknowledgment in the product documentation would be

appreciated but is not required.

2. Altered source versions must be plainly marked as such, and must not be

misrepresented as being the original source code.

3. This notice may not be removed or altered from any source distribution.

René Nyffenegger [email protected]

*/

#include "Socket.h"

#include <iostream>

using namespace std;

int Socket::nofSockets_= 0;

void Socket::Start() {

if (!nofSockets_) {

WSADATA info;

if (WSAStartup(MAKEWORD(2,0), &info)) {

throw "Could not start WSA";

}

++nofSockets_;

}

void Socket::End() {

WSACleanup();

}

Socket::Socket() : s_(0) {

Start();

// UDP: use SOCK_DGRAM instead of SOCK_STREAM

s_ = socket(AF_INET,SOCK_STREAM,0);

if (s_ == INVALID_SOCKET) {

throw "INVALID_SOCKET";

}

refCounter_ = new int(1);

}

Socket::Socket(SOCKET s) : s_(s) {

Start();

refCounter_ = new int(1);

};

Socket::~Socket() {

if (! --(*refCounter_)) {

Close();

delete refCounter_;

}

--nofSockets_;

if (!nofSockets_) End();

}

Socket::Socket(const Socket& o) {

refCounter_=o.refCounter_;

(*refCounter_)++;

s_ =o.s_;

nofSockets_++;

}

Socket& Socket::operator=(Socket& o) {

(*o.refCounter_)++;

refCounter_=o.refCounter_;

s_ =o.s_;

nofSockets_++;

return *this;

}

void Socket::Close() {

closesocket(s_);

}

std::string Socket::ReceiveBytes() {

std::string ret;

char buf[1024];

while (1) {

u_long arg = 0;

if (ioctlsocket(s_, FIONREAD, &arg) != 0)

break;

if (arg == 0)

break;

if (arg > 1024) arg = 1024;

int rv = recv (s_, buf, arg, 0);

if (rv <= 0) break;

std::string t;

t.assign (buf, rv);

ret += t;

}

return ret;

}

std::string Socket::ReceiveLine() {

std::string ret;

while (1) {

char r;

switch(recv(s_, &r, 1, 0)) {

case 0: // not connected anymore;

// ... but last line sent

// might not end in \n,

// so return ret anyway.

return ret;

case -1:

return "";

// if (errno == EAGAIN) {

// return ret;

// } else {

// // not connected anymore

// return "";

// }

}

ret += r;

if (r == '\n') return ret;

}

void Socket::SendLine(std::string s) {

s += '\n';

send(s_,s.c_str(),s.length(),0);

}

void Socket::SendBytes(const std::string& s) {

send(s_,s.c_str(),s.length(),0);

}

SocketServer::SocketServer(int port, int connections, TypeSocket type) {

sockaddr_in sa;

memset(&sa, 0, sizeof(sa));

sa.sin_family = PF_INET;

sa.sin_port = htons(port);

s_ = socket(AF_INET, SOCK_STREAM, 0);

if (s_ == INVALID_SOCKET) {

throw "INVALID_SOCKET";

}

if(type==NonBlockingSocket) {

u_long arg = 1;

ioctlsocket(s_, FIONBIO, &arg);

}

/* bind the socket to the internet address */

if (bind(s_, (sockaddr *)&sa, sizeof(sockaddr_in)) == SOCKET_ERROR) {

closesocket(s_);

throw "INVALID_SOCKET";

}

listen(s_, connections);

}

Socket* SocketServer::Accept() {

SOCKET new_sock = accept(s_, 0, 0);

if (new_sock == INVALID_SOCKET) {

int rc = WSAGetLastError();

if(rc==WSAEWOULDBLOCK) {

return 0; // non-blocking call, no request pending

}

else {

throw "Invalid Socket";

}

Socket* r = new Socket(new_sock);

return r;

}

SocketClient::SocketClient(const std::string& host, int port) : Socket() {

std::string error;

hostent *he;

if ((he = gethostbyname(host.c_str())) == 0) {

error = strerror(errno);

throw error;

}

sockaddr_in addr;

addr.sin_family = AF_INET;

addr.sin_port = htons(port);

addr.sin_addr = *((in_addr *)he->h_addr);

memset(&(addr.sin_zero), 0, 8);

if (::connect(s_, (sockaddr *) &addr, sizeof(sockaddr))) {

error = strerror(WSAGetLastError());

throw error;

}

SocketSelect::SocketSelect(Socket const * const s1, Socket const * const s2, TypeSocket type) {

FD_ZERO(&fds_);

FD_SET(const_cast<Socket*>(s1)->s_,&fds_);

if(s2) {

FD_SET(const_cast<Socket*>(s2)->s_,&fds_);

}

TIMEVAL tval;

tval.tv_sec = 0;

tval.tv_usec = 1;

TIMEVAL *ptval;

if(type==NonBlockingSocket) {

ptval = &tval;

}

else {

ptval = 0;

}

if (select (0, &fds_, (fd_set*) 0, (fd_set*) 0, ptval) == SOCKET_ERROR)

throw "Error in select";

}

bool SocketSelect::Readable(Socket const* const s) {

if (FD_ISSET(s->s_,&fds_)) return true;

return false;

}

application program

Klikk for å se/fjerne innholdet nedenfor

#include "Socket.h"

#include <iostream>

using namespace std;

int main() {

try {

SocketClient s("www.google.com", 80);

s.SendLine("GET / HTTP/1.0");

s.SendLine("Host: www.google.com");

s.SendLine("");

while (1) {

string l = s.ReceiveLine();

if (l.empty()) break;

cout << l;

cout.flush();

}

catch (const char* s) {

cerr << s << endl;

}

catch (std::string s) {

cerr << s << endl;

}

catch (...) {

cerr << "unhandled exception\n";

}

return 0;

}

Her er feilmeldingen

Klikk for å se/fjerne innholdet nedenfor

1>------ Build started: Project: htmlreader, Configuration: Debug Win32 ------

1>Compiling...

1>test.cpp

1>socket.cpp

1>c:\documents and settings\kga\my documents\visual studio 2005\projects\htmlreader\htmlreader\socket.cpp(153) : warning C4267: 'argument' : conversion from 'size_t' to 'int', possible loss of data

1>c:\documents and settings\kga\my documents\visual studio 2005\projects\htmlreader\htmlreader\socket.cpp(157) : warning C4267: 'argument' : conversion from 'size_t' to 'int', possible loss of data

1>c:\documents and settings\kga\my documents\visual studio 2005\projects\htmlreader\htmlreader\socket.cpp(207) : warning C4996: 'strerror': This function or variable may be unsafe. Consider using strerror_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

1> c:\program files\microsoft visual studio 8\vc\include\string.h(126) : see declaration of 'strerror'

1>c:\documents and settings\kga\my documents\visual studio 2005\projects\htmlreader\htmlreader\socket.cpp(218) : warning C4996: 'strerror': This function or variable may be unsafe. Consider using strerror_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

1> c:\program files\microsoft visual studio 8\vc\include\string.h(126) : see declaration of 'strerror'

1>Generating Code...

1>Linking...

1>socket.obj : error LNK2019: unresolved external symbol __imp__WSAStartup@8 referenced in function "private: static void __cdecl Socket::Start(void)" (?Start@Socket@@CAXXZ)

1>socket.obj : error LNK2019: unresolved external symbol __imp__WSACleanup@0 referenced in function "private: static void __cdecl Socket::End(void)" (?End@Socket@@CAXXZ)

1>socket.obj : error LNK2019: unresolved external symbol __imp__socket@12 referenced in function "protected: __thiscall Socket::Socket(void)" (??0Socket@@IAE@XZ)

1>socket.obj : error LNK2019: unresolved external symbol __imp__closesocket@4 referenced in function "public: void __thiscall Socket::Close(void)" (?Close@Socket@@QAEXXZ)

1>socket.obj : error LNK2019: unresolved external symbol __imp__recv@16 referenced in function "public: class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __thiscall Socket::ReceiveBytes(void)" (?ReceiveBytes@Socket@@QAE?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@XZ)

1>socket.obj : error LNK2019: unresolved external symbol __imp__ioctlsocket@12 referenced in function "public: class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __thiscall Socket::ReceiveBytes(void)" (?ReceiveBytes@Socket@@QAE?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@XZ)

1>socket.obj : error LNK2019: unresolved external symbol __imp__send@16 referenced in function "public: void __thiscall Socket::SendLine(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >)" (?SendLine@Socket@@QAEXV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)

1>socket.obj : error LNK2019: unresolved external symbol __imp__listen@8 referenced in function "public: __thiscall SocketServer::SocketServer(int,int,enum TypeSocket)" (??0SocketServer@@QAE@HHW4TypeSocket@@@Z)

1>socket.obj : error LNK2019: unresolved external symbol __imp__bind@12 referenced in function "public: __thiscall SocketServer::SocketServer(int,int,enum TypeSocket)" (??0SocketServer@@QAE@HHW4TypeSocket@@@Z)

1>socket.obj : error LNK2019: unresolved external symbol __imp__htons@4 referenced in function "public: __thiscall SocketServer::SocketServer(int,int,enum TypeSocket)" (??0SocketServer@@QAE@HHW4TypeSocket@@@Z)

1>socket.obj : error LNK2019: unresolved external symbol __imp__WSAGetLastError@0 referenced in function "public: class Socket * __thiscall SocketServer::Accept(void)" (?Accept@SocketServer@@QAEPAVSocket@@XZ)

1>socket.obj : error LNK2019: unresolved external symbol __imp__accept@12 referenced in function "public: class Socket * __thiscall SocketServer::Accept(void)" (?Accept@SocketServer@@QAEPAVSocket@@XZ)

1>socket.obj : error LNK2019: unresolved external symbol __imp__connect@12 referenced in function "public: __thiscall SocketClient::SocketClient(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,int)" (??0SocketClient@@QAE@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@H@Z)

1>socket.obj : error LNK2019: unresolved external symbol __imp__gethostbyname@4 referenced in function "public: __thiscall SocketClient::SocketClient(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,int)" (??0SocketClient@@QAE@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@H@Z)

1>socket.obj : error LNK2019: unresolved external symbol __imp__select@20 referenced in function "public: __thiscall SocketSelect::SocketSelect(class Socket const * const,class Socket const * const,enum TypeSocket)" (??0SocketSelect@@QAE@QBVSocket@@0W4TypeSocket@@@Z)

1>socket.obj : error LNK2019: unresolved external symbol ___WSAFDIsSet@8 referenced in function "public: bool __thiscall SocketSelect::Readable(class Socket const * const)" (?Readable@SocketSelect@@QAE_NQBVSocket@@@Z)

1>C:\Documents and Settings\KGA\My Documents\Visual Studio 2005\Projects\htmlreader\Debug\htmlreader.exe : fatal error LNK1120: 16 unresolved externals

1>Build log was saved at "file://c:\Documents and Settings\KGA\My Documents\Visual Studio 2005\Projects\htmlreader\htmlreader\Debug\BuildLog.htm"

1>htmlreader - 17 error(s), 4 warning(s)

========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Eller mer presist er det denne delen som går igjen hele veien, på andre koder jeg har prøvd med winsock også.

unresolved external symbol

Hva er det jeg gjør feil?

Bruker visual studio, i tilfelle det er noe instillinger der jeg må mekke.

kode kopier fra annet sted, samme type feil her som forige kode.

Klikk for å se/fjerne innholdet nedenfor

/*

** getip.c -- a hostname lookup demo

*/

#include <stdio.h>

#include <stdlib.h>

#include <errno.h>

#include <winsock.h>

int main(int argc, char *argv[])

{

struct hostent *h;

WSADATA wsaData; // if this doesn't work

//WSAData wsaData; // then try this instead

if (WSAStartup(MAKEWORD(1, 1), &wsaData) != 0) {

fprintf(stderr, "WSAStartup failed.\n");

exit(1);

}

if (argc != 2) { // error check the command line

fprintf(stderr,"usage: getip address\n");

exit(1);

}

if ((h=gethostbyname(argv[1])) == NULL) { // get the host info

// herror("gethostbyname");

exit(1);

}

printf("Host name : %s\n", h->h_name);

printf("IP Address : %s\n", inet_ntoa(*((struct in_addr *)h->h_addr)));

return 0;

}

Endret 20. juni 2007 av Lord-KGA

Giddion · 17. juni 2007

Det virker som om du ikke linker med winsock biblioteket

du kan legge det inn i prosjekt innstillingene eller legge til koden under.

#pragma comment(lib,"Ws2_32.lib")

lykke til

Endret 17. juni 2007 av Giddion

-kga- · 17. juni 2007

Takker!

Endret 17. juni 2007 av Lord-KGA

-kga- · 20. juni 2007

Jeg får ikke til og koble meg til oslobørs for og få ut kurs informasjon, er det noe jeg gjør feil?

bruker samme klassenne som jeg postet over, fungerer bra nokk til og få ut html kodenne fra sidenne. Trur jeg da, kommer jo ikke inn på oslobørs.

SocketClient s("www.oslobors.no", 80);

   s.SendLine("GET /ob/aksjer?menu2show=1.1.1. HTTP/1.1");
   s.SendLine("Host: www.oslobors.no");
   s.SendLine("");

Jeg kommer inn andre seder, feks.

SocketClient s("norma.netfonds.no", 80);

   s.SendLine("GET /kurs.php HTTP/1.1");
   s.SendLine("Host: norma.netfonds.no");
   s.SendLine("");

Kan vel altids få informasjonen fra et annet sted enn oslobørs, som siden over. Men hvorfor kan jeg ikke hente den fra oslo børs?

Giddion · 20. juni 2007

Jeg savner mye informasjon om feilen.

Motar du noe?

Får du kontakt med serveren? dvs. "connect(SOCKET s...);"

Får du returnert noen feilkoder?

Hva mener du med kommer ikke inn på oslo børs?

-kga- · 20. juni 2007

Den stopper opp, motar ingen ting. Den vill ikke gå videre ut fra recv funksjonen inne i recivline funksjonen i socket.cpp klassen. Det er verfal ved recv som hører til winsock som stopper opp. Testa og skrive ut informasjon like før den komandoen og like etter. Det før kom, men printf etter recv kom ikke siden koden stoppet opp.

Mulig jeg burde lage noe time out funksjon så den ikke stopper helt opp som nå.

Dead_Rabbit · 20. juni 2007

recv blokker jo, så kan det være at du rett og slett ikke får noe respons fra serveren? Sier perror-funksjonen noe?

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unresolved external symbol ved socket bruk

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