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我在VS2005中创建了一个小型CLR库（MyClient），将线程集成到现有的C++应用程序（也写在VS2005中）。当我建立这个项目得到这些错误：错误LNK2019：无法解析的外部符号（小型库）
1>PSR_CRSDlg.obj : error LNK2019: unresolved external symbol "public: static void __cdecl MyClient::StartClientThread(void)" ([email protected]@@SAXXZ) referenced in function "public: void __thiscall CPSR_CRSDlg::OnBnClickedInit2(void)" ([email protected][email protected]@QAEXXZ)
1>PSR_CRSDlg.obj : error LNK2019: unresolved external symbol "public: static void __cdecl MyClient::SendJointValues(double *)" ([email protected]@@[email protected]) referenced in function "public: void __thiscall CPSR_CRSDlg::OnTimer(unsigned int)" ([email protected][email protected]@[email protected])
1>PSR_CRSDlg.obj : error LNK2019: unresolved external symbol "public: static void __cdecl MyClient::StopConnection(void)" ([email protected]@@SAXXZ) referenced in function "public: void __thiscall CPSR_CRSDlg::OnBnClickedMovepenall(void)" ([email protected][email protected]@QAEXXZ)
1>D:\Desktop\PSR\Software\Source - June 21\PSR_CRS_SVN - Copy (2)\Debug\PSR_CRS.exe : fatal error LNK1120: 3 unresolved externals
我是新一个有点新的C++和OOP，但一直在不断做在过去的几个星期。这是我的.h文件：
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);
};
我.cpp文件只是有实例为char * MyClient :: createMsg（字符串s）等功能，所以我不认为这是问题。我也浏览了大部分链接here，并且搜索了很多以确保我的库全部存在，没有循环库依赖，库命令等。在我的整个解决方案中的3个项目中，2使用“No Common Language运行时支持“，但我的客户端库使用”公共语言运行时支持“，这是库之间的一个区别。
有没有人有想过为什么会发生这些错误？
完整的客户端库：
#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();
}
编辑：当我创建的时候相同的设置应用程序我试图与整合，现在，这是一个虚拟的应用没有发生这些错误为什么我不确定发生了什么变化或如何解决错误。
在有人关闭这个副本之前，你是否在因特网上搜索“lnk2019”？ –
通常，“未解决的符号错误”意味着您没有链接对象，库或dll文件。 –
可能的重复[什么是未定义的引用/未解析的外部符号错误，以及如何解决它？]（http://stackoverflow.com/questions/12573816/what-is-an-undefined-reference-unresolved-external-符号错误和怎么办我修复） –