I've created a small CLR library (MyClient) in VS2005 to integrate threading into an existing C++ application (also written in VS2005). When I build the project get these errors:
1>PSR_CRSDlg.obj : error LNK2019: unresolved external symbol "public: static void __cdecl MyClient::StartClientThread(void)" (?StartClientThread@MyClient@@SAXXZ) referenced in function "public: void __thiscall CPSR_CRSDlg::OnBnClickedInit2(void)" (?OnBnClickedInit2@CPSR_CRSDlg@@QAEXXZ)
1>PSR_CRSDlg.obj : error LNK2019: unresolved external symbol "public: static void __cdecl MyClient::SendJointValues(double *)" (?SendJointValues@MyClient@@SAXPAN@Z) referenced in function "public: void __thiscall CPSR_CRSDlg::OnTimer(unsigned int)" (?OnTimer@CPSR_CRSDlg@@QAEXI@Z)
1>PSR_CRSDlg.obj : error LNK2019: unresolved external symbol "public: static void __cdecl MyClient::StopConnection(void)" (?StopConnection@MyClient@@SAXXZ) referenced in function "public: void __thiscall CPSR_CRSDlg::OnBnClickedMovepenall(void)" (?OnBnClickedMovepenall@CPSR_CRSDlg@@QAEXXZ)
1>D:\Desktop\PSR\Software\Source - June 21\PSR_CRS_SVN - Copy (2)\Debug\PSR_CRS.exe : fatal error LNK1120: 3 unresolved externals
I'm new a bit new to C++ and OOP but have been doing it continuously for the past few weeks. This is my .h file:
using namespace std;
class MyClient
{
public:
static char* createMsg(string s);
static char* parseJSON(double j1, double j2, double j3, double j4, double j5, double j6);
static void StartConnection();
static void StartClientThread();
static void StopConnection();
static void SendJointValues(double *joints);
};
My .cpp file just has the functions instantiated as char* MyClient::createMsg(string s), etc, so I don't think that is the problem. I've also gone through most of the links here and searched a lot to make sure my libraries were all there, no circular lib dependency, library order, etc. Out of the 3 projects in my whole solution, 2 use "No Common Language Runtime support" but my client library uses "Common Language Runtime Support", this is the one difference between the libraries.
Does anyone have thoughts on why these errors are occurring?
Full Client Library:
#define WIN32_LEAN_AND_MEAN
#define NOMINMAX
#include "stdafx.h"
#include <winsock2.h>
#include <windows.h>
#include <ws2tcpip.h>
#include <stdlib.h>
#include <iostream>
#include <typeinfo>
#include <sstream>
#include "Client.h"
using namespace std;
using namespace System;
using namespace System::Threading;
// Need to link with Ws2_32.lib, Mswsock.lib, and Advapi32.lib
#pragma comment (lib, "Ws2_32.lib")
#pragma comment (lib, "Mswsock.lib")
#pragma comment (lib, "AdvApi32.lib")
#define DEFAULT_BUFLEN 4096
#define DEFAULT_PORT "9001"
char recvbuf[DEFAULT_BUFLEN];
int iResult;
int recvbuflen = DEFAULT_BUFLEN;
SOCKET ConnectSocket;
char* MyClient::createMsg(string s) {
char *a = new char[s.size() + 1];
a[s.size()] = 0;
memcpy(a, s.c_str(), s.size());
return a;
}
char* MyClient::parseJSON(double j1, double j2, double j3, double j4, double j5, double j6)
{
ostringstream oss;
oss << j1 << ',' << j2 << ',' << j3 << ',' << j4 << ',' << j5 << ',' << j6;
string joints = oss.str();
return createMsg(joints);
}
void MyClient::StartConnection()
{
//printf("Connection Starting... \n");
WSADATA wsaData;
ConnectSocket = INVALID_SOCKET;
struct addrinfo *result = NULL,
*ptr = NULL,
hints;
int argc = 2;
// Validate the parameters
if (argc != 2) {
printf("usage: %s server-name\n", "client");
return;
}
// Initialize Winsock
iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
if (iResult != 0) {
printf("WSAStartup failed with error: %d\n", iResult);
return;
}
ZeroMemory( &hints, sizeof(hints) );
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
// Resolve the server address and port
//iResult = getaddrinfo(argv[1], DEFAULT_PORT, &hints, &result);
iResult = getaddrinfo("localhost", DEFAULT_PORT, &hints, &result);
if ( iResult != 0 ) {
printf("getaddrinfo failed with error: %d\n", iResult);
WSACleanup();
return;
}
// Attempt to connect to an address until one succeeds
for(ptr=result; ptr != NULL ;ptr=ptr->ai_next) {
// Create a SOCKET for connecting to server
ConnectSocket = socket(ptr->ai_family, ptr->ai_socktype,
ptr->ai_protocol);
if (ConnectSocket == INVALID_SOCKET) {
printf("socket failed with error: %ld\n", WSAGetLastError());
WSACleanup();
return;
}
// Connect to server.
iResult = connect( ConnectSocket, ptr->ai_addr, (int)ptr->ai_addrlen);
if (iResult == SOCKET_ERROR) {
closesocket(ConnectSocket);
ConnectSocket = INVALID_SOCKET;
continue;
}
break;
}
freeaddrinfo(result);
if (ConnectSocket == INVALID_SOCKET) {
printf("Unable to connect to server!\n");
WSACleanup();
return;
}
return;
}
void MyClient::StopConnection(){
closesocket(ConnectSocket);
WSACleanup();
return;
}
void MyClient::SendJointValues(double *joints){
char *j;
iResult = recv(ConnectSocket, recvbuf, recvbuflen, 0);
j = parseJSON(joints[0],joints[1],joints[2],joints[3], \
joints[4],joints[5]);
int x = send(ConnectSocket, j, strlen(j), 0);
//iResult = recv(ConnectSocket, recvbuf, recvbuflen, 0);
}
void MyClient::StartClientThread()
{
Thread^ cln;
ThreadStart ^ClientThread = gcnew ThreadStart(&MyClient::StartConnection);
cln = gcnew Thread(ClientThread);
cln->IsBackground = true;
cln->Start();
}
Edit: These errors did not occur when I created a dummy application when the same settings as the application I am trying to integrate with right now, which is why I'm not sure what has changed or how to resolve the errors.
