我有以下文件和错误描述如下：
1- Connection.cpp
#include "iostream"
#include "stdafx.h"
#include "Connection.h"
#include <libpq-fe.h>
using namespace std;
Connection::Connection()
{
}
PGconn *Connection::getConnection()
{
const char *connStr = "dbname=Fidelity user=postgres password=home hostaddr=127.0.0.1 port=5432";
PGconn* conn;
conn = PQconnectdb(connStr);
/* if(PQstatus(conn) != CONNECTION_OK)
{
cout << "\nConnection Failed.";
PQfinish(conn);
}
else
{
cout << "\nConnection Successful\n\n";
}*/
return conn;
}
2-主文件：
#include "stdafx.h"
#include "DataCorroborationDLL.h"
#include "iostream"
#include "conio.h"
#include "Connection.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#endif
// The one and only application object
CWinApp theApp;
using namespace std;
int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
int nRetCode = 0;
HMODULE hModule = ::GetModuleHandle(NULL);
if (hModule != NULL)
{
// initialize MFC and print and error on failure
if (!AfxWinInit(hModule, NULL, ::GetCommandLine(), 0))
{
// TODO: change error code to suit your needs
_tprintf(_T("Fatal Error: MFC initialization failed\n"));
nRetCode = 1;
}
else
{
cout << "Hello world";
Connection con;
con.getConnection();
cout <<getch();
}
}
else
{
// TODO: change error code to suit your needs
_tprintf(_T("Fatal Error: GetModuleHandle failed\n"));
nRetCode = 1;
}
return nRetCode;
}
我已经安装了postgresql的"include Directory"，它包含目录和lib目录 . 它识别postgres命令，但不是全部 . 现在当我编译时，我收到此错误：
Connection.obj：错误LNK2001：未解析的外部符号_PQconnectdb
1> C：\ Users \ Irfan \ Desktop \ IGD \ DataCorroborationDLL \ Release \ Tests.exe：致命错误
LNK1120：1个未解析的外部