unresolved externals

This is a discussion on unresolved externals within the Windows Programming forums, part of the Platform Specific Boards category; Hi, i compile my program and get the following linker errors... As far as i can understand, they have to ...

  1. #1
    Registered User
    Join Date
    Dec 2007
    Posts
    19

    unresolved externals

    Hi,
    i compile my program and get the following linker errors... As far as i can understand, they have to do with the outputstream -i have defined "iostream" OK i think. What's wrong?

    Code:
    ------ Rebuild All started: Project: MifareRW4, Configuration: Debug Win32 ------
    
    Deleting intermediate files and output files for project 'MifareRW4', configuration 'Debug|Win32'.
    Compiling...
    stdafx.cpp
     WINVER not defined. Defaulting to 0x0501 (Windows XP and Windows .NET Server)
    IDAdmin.cpp
     WINVER not defined. Defaulting to 0x0501 (Windows XP and Windows .NET Server)
    c:\documents and settings\kostas\τα έγγραφά μου\visual studio projects\cardmanager\libs\mysql++\include\exceptions.h(44) : warning C4275: non dll-interface class 'exception' used as base for dll-interface class 'mysqlpp::Exception'
            c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\exception(39) : see declaration of 'exception'
            c:\documents and settings\kostas\τα έγγραφά μου\visual studio projects\cardmanager\libs\mysql++\include\exceptions.h(43) : see declaration of 'mysqlpp::Exception'
    c:\documents and settings\kostas\τα έγγραφά μου\visual studio projects\cardmanager\libs\mysql++\include\query.h(131) : warning C4275: non dll-interface class 'std::ios_base' used as base for dll-interface class 'std::basic_ios<_Elem,_Traits>'
            with
            [
                _Elem=char,
                _Traits=std::char_traits<char>
            ]
            c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\xiosbase(181) : see declaration of 'std::ios_base'
    Generating Code...
    c:\documents and settings\kostas\Ϊά ▌ήήά▄ ΉΎΫ\visual studio projects\cardmanager\idadmin.cpp(153) : warning C4715: 'CIDAdmin::UpdateDB' : not all control paths return a value
    Compiling resources...
    Linking...
    nafxcwd.lib(afxmem.obj) : error LNK2005: "void * __cdecl operator new(unsigned int)" (??2@YAPAXI@Z) already defined in libcpmtd.lib(newop.obj)
    IDAdmin.obj : warning LNK4217: locally defined symbol ?setstate@?$basic_ios@DU?$char_traits@D@std@@@std@@QAEXH_N@Z (public: void __thiscall std::basic_ios<char,struct std::char_traits<char> >::setstate(int,bool)) imported in function __catch$??$?6U?$char_traits@D@std@@@std@@YAAAV?$basic_ostream@DU?$char_traits@D@std@@@0@AAV10@PBD@Z$0
    IDAdmin.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: class std::basic_ostream<char,struct std::char_traits<char> > & __thiscall std::basic_ostream<char,struct std::char_traits<char> >::operator<<(class std::basic_ostream<char,struct std::char_traits<char> > & (__cdecl*)(class std::basic_ostream<char,struct std::char_traits<char> > &))" (__imp_??6?$basic_ostream@DU?$char_traits@D@std@@@std@@QAEAAV01@P6AAAV01@AAV01@@Z@Z) referenced in function "public: __thiscall CIDAdmin::CIDAdmin(void)" (??0CIDAdmin@@QAE@XZ)
    IDAdmin.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: class std::basic_ostream<char,struct std::char_traits<char> > & __thiscall std::basic_ostream<char,struct std::char_traits<char> >::flush(void)" (__imp_?flush@?$basic_ostream@DU?$char_traits@D@std@@@std@@QAEAAV12@XZ) referenced in function "class std::basic_ostream<char,struct std::char_traits<char> > & __cdecl std::endl(class std::basic_ostream<char,struct std::char_traits<char> > &)" (?endl@std@@YAAAV?$basic_ostream@DU?$char_traits@D@std@@@1@AAV21@@Z)
    IDAdmin.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: class std::basic_ostream<char,struct std::char_traits<char> > & __thiscall std::basic_ostream<char,struct std::char_traits<char> >::put(char)" (__imp_?put@?$basic_ostream@DU?$char_traits@D@std@@@std@@QAEAAV12@D@Z) referenced in function "class std::basic_ostream<char,struct std::char_traits<char> > & __cdecl std::endl(class std::basic_ostream<char,struct std::char_traits<char> > &)" (?endl@std@@YAAAV?$basic_ostream@DU?$char_traits@D@std@@@1@AAV21@@Z)
    IDAdmin.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: class std::basic_streambuf<char,struct std::char_traits<char> > * __thiscall std::basic_ios<char,struct std::char_traits<char> >::rdbuf(void)const " (__imp_?rdbuf@?$basic_ios@DU?$char_traits@D@std@@@std@@QBEPAV?$basic_streambuf@DU?$char_traits@D@std@@@2@XZ) referenced in function "class std::basic_ostream<char,struct std::char_traits<char> > & __cdecl std::operator<<<struct std::char_traits<char> >(class std::basic_ostream<char,struct std::char_traits<char> > &,char const *)" (??$?6U?$char_traits@D@std@@@std@@YAAAV?$basic_ostream@DU?$char_traits@D@std@@@0@AAV10@PBD@Z)
    IDAdmin.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: char __thiscall std::basic_ios<char,struct std::char_traits<char> >::fill(void)const " (__imp_?fill@?$basic_ios@DU?$char_traits@D@std@@@std@@QBEDXZ) referenced in function "class std::basic_ostream<char,struct std::char_traits<char> > & __cdecl std::operator<<<struct std::char_traits<char> >(class std::basic_ostream<char,struct std::char_traits<char> > &,char const *)" (??$?6U?$char_traits@D@std@@@std@@YAAAV?$basic_ostream@DU?$char_traits@D@std@@@0@AAV10@PBD@Z)
    IDAdmin.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: class std::basic_ostream<char,struct std::char_traits<char> > * __thiscall std::basic_ios<char,struct std::char_traits<char> >::tie(void)const " (__imp_?tie@?$basic_ios@DU?$char_traits@D@std@@@std@@QBEPAV?$basic_ostream@DU?$char_traits@D@std@@@2@XZ) referenced in function "public: __thiscall std::basic_ostream<char,struct std::char_traits<char> >::sentry::sentry(class std::basic_ostream<char,struct std::char_traits<char> > &)" (??0sentry@?$basic_ostream@DU?$char_traits@D@std@@@std@@QAE@AAV12@@Z)
    IDAdmin.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: void __thiscall std::basic_ostream<char,struct std::char_traits<char> >::_Osfx(void)" (__imp_?_Osfx@?$basic_ostream@DU?$char_traits@D@std@@@std@@QAEXXZ) referenced in function "public: __thiscall std::basic_ostream<char,struct std::char_traits<char> >::sentry::~sentry(void)" (??1sentry@?$basic_ostream@DU?$char_traits@D@std@@@std@@QAE@XZ)
    Debug/idadmin.exe : fatal error LNK1120: 7 unresolved externals
    
    Build log was saved at "file://c:\Documents and Settings\kostas\Τα έγγραφά μου\Visual Studio Projects\CardManager\Debug\BuildLog.htm"
    MifareRW4 - 9 error(s), 4 warning(s)
    
    
    ---------------------- Done ----------------------
    
        Rebuild All: 0 succeeded, 1 failed, 0 skipped
    stdafx.h
    Code:
    // stdafx.h : include file for standard system include files,
    // or project specific include files that are used frequently, but
    // are changed infrequently
    //
    
    #pragma once
    
    
    #include <iostream>
    #include <tchar.h>
    #define _ATL_CSTRING_EXPLICIT_CONSTRUCTORS	// some CString constructors will be explicit
    
    #ifndef VC_EXTRALEAN
    #define VC_EXTRALEAN		// Exclude rarely-used stuff from Windows headers
    #endif
    
    #include <afx.h>
    #include <afxwin.h>         // MFC core and standard components
    #include <afxext.h>         // MFC extensions
    #include <afxdtctl.h>		// MFC support for Internet Explorer 4 Common Controls
    #ifndef _AFX_NO_AFXCMN_SUPPORT
    #include <afxcmn.h>			// MFC support for Windows Common Controls
    #endif // _AFX_NO_AFXCMN_SUPPORT
    
    
    // TODO: reference additional headers your program requires here
    IDAdmin.h
    Code:
    #define MIFARE_KEYLEN 6
    #define MIFARE_KEYNR 0
    #define MIFARE_BLOCKNR 4
    #define MIFARE_BUFLEN 16
    
    //#include <iostream>
    #include <fstream>
    #include <string>
    #include <winscard.h>
    
    #include "resource.h"
    extern "C"{
    #include <ok.h>
    #include <scardcl.h>
    }
    
    #include "mysql++.h"
    #include <iostream>
    
    using namespace std;
    
    class CIDAdmin
    {
    	public:
    		CIDAdmin();
    		~CIDAdmin();
    		//writes the new id to card and the (id,full_name)
    		//tuple to a file
    		void enlistNew(char* cid, CString* surname,CString* name);
    		//reads the id, that already exists in the card;
    		//will be "000...0" if none has been assigned yet
    		void readExistingFromCard(); 
    
    
    	private:
    		SCARDHANDLE hSHandle;
    		SCARDCONTEXT hSContext;
    		////reads a (id,full_name) tuple directly from 
    		////command-line
    		//string  getNewEntryFromUser();
    		void CStrToUchar(CString str, UCHAR *ucBuffer, ULONG *ulBufferLen);
    		//void StrToUchar(CString str, UCHAR *ucBuffer, ULONG *ulBufferLen);
    		void UcharToStr(UCHAR *ucDataBuffer, ULONG ulDataBufLen, char *str);
    		bool UpdateDB(char* cid,CString* surname,CString* name);
    		//static void dprint(string s);
    };
    IDAdmin.cpp
    Code:
    #include "stdafx.h"
    #include "IDAdmin.h"
    
    CWinApp theApp;
    
    using namespace std;
    
    CIDAdmin::CIDAdmin()
    {
    	hSHandle = 0x00000000;
    	hSContext = 0x00000000;
    
    	if (SCARD_S_SUCCESS != SCardEstablishContext(SCARD_SCOPE_USER,NULL,NULL,&hSContext)) 
    	{
    		cerr << "failed to establish context to reader... exited" <<endl;
    		exit(-1);
    	}	
    
    
    	DWORD dwAP;
    	if (SCARD_S_SUCCESS != SCardConnect(hSContext, (LPCTSTR)"OMNIKEY CardMan 5x21-CL 0",
    			             SCARD_SHARE_SHARED,SCARD_PROTOCOL_T0 | SCARD_PROTOCOL_T1,
    			             &hSHandle,&dwAP ))
    	{
    		cerr << "failed to connect to card..." << endl <<
    			"check the card has been detected by the CL interface! exited" <<endl;
    		exit(-1);
    	}
    
    
    	UCHAR ucMifareAuthMode=MIFARE_AUTHENT1A;
    	UCHAR ucMifareKey[6]={0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
    	ULONG ulMifareKeyLen = MIFARE_KEYLEN;
    	UCHAR ucMifareAccessType=MIFARE_KEY_INPUT;
    	UCHAR ucMifareKeyNr=MIFARE_KEYNR;
    	LONG m_longBlockNr=MIFARE_BLOCKNR;
    
    	if (NO_ERROR != SCardCLMifareStdAuthent(hSHandle,m_longBlockNr,ucMifareAuthMode,
    				ucMifareAccessType,ucMifareKeyNr,ucMifareKey, ulMifareKeyLen))
    	{
    		cerr << "failed to authenticate... exited" << endl;
    		exit(-1);
    	}
    }//CIDAdmin
    
    
    void CIDAdmin::readExistingFromCard()
    {
    	LONG m_longBlockNr=MIFARE_BLOCKNR;
    	UCHAR ucMifareDataRead[16];
    	ULONG ulMifareNumOfDataRead;
    
    	if (NO_ERROR!=SCardCLMifareStdRead(hSHandle,m_longBlockNr,
    		ucMifareDataRead,16,&ulMifareNumOfDataRead))
    	{
    		cerr <<"failed to read data from card... exited"<<endl;
    		exit(-1);
    	}
    		
    	for (int i=0; i<MIFARE_BUFLEN; i++)
    	{
    		if (ucMifareDataRead[i]!=0)
    			cout <<ucMifareDataRead[i];
    	}
    	cout << endl;
    }//readExistingFromCard
    
    
    void CIDAdmin::enlistNew(char* cid, CString* surname,CString* name)
    {
    	UCHAR ucDataToWrite[MIFARE_BUFLEN];
    	ULONG ulBufferLen = MIFARE_BUFLEN;
    	for (int i=0; i<MIFARE_BUFLEN; i++)
    	{
    		ucDataToWrite[i]=(UCHAR)cid[i];
    	}
    
    	if (NO_ERROR!=SCardCLMifareStdWrite(hSHandle,(LONG)MIFARE_BLOCKNR,ucDataToWrite,ulBufferLen))
    	{
    		cerr << "failed to write to card" << endl;
    	}
    	else //if successful update of ID in card, update db
    	{
    		UpdateDB(cid,surname,name);
    	}
    
    
    	cout << "ID has been written successfully" << endl;
    }//enlistNew
    
    
    CIDAdmin::~CIDAdmin()
    {
    	if (SCARD_S_SUCCESS != SCardDisconnect(hSHandle,SCARD_LEAVE_CARD))
    	{
    		cerr << "failed to diconnect card..." << endl;
    	}
    
    	if (SCARD_S_SUCCESS!= SCardReleaseContext(hSContext))
    	{
    		cerr << "failed to release context from reader... exited" << endl;
    		exit(-1);
    	}
    }//~CIDAdmin
    
    
    bool CIDAdmin::UpdateDB(char* cid,CString* surname,CString* name)
    {
    	bool bCon;
    	CString m_errorInfo;
    
    	mysqlpp::Connection m_Connection;
    	
    	try
    	{		
    		bCon = m_Connection.connect("humabio","localhost","root","123",3306);			
    		if(bCon)
    		{
    			//cout <<"Succesfully connected to the database" << endl;
    
    
    			mysqlpp::Query query = m_Connection.query(); 
    			
    			CString sUpdate="INSERT INTO persons (";
    			sUpdate.Append(cid);			
    			sUpdate.Append(",\"");
    			sUpdate.Append(*surname);			
    			sUpdate.Append("\"\,\"");
    			sUpdate.Append(*name);
    			sUpdate.Append("\"\)");
    
    			query << sUpdate;
    
    			return true;
    		}
    
    		return false;
    	}
    	catch(mysqlpp::ConnectionFailed cf)
    	{
    		m_errorInfo = cf.what();
    		cerr << "Connection to the database failed" << endl;
    		//TRACE("%s \n",cf.what());			
    		cerr << cf.what() << endl;
    	}
    	catch(mysqlpp::Exception ex)
    	{
    		m_errorInfo = ex.what();
    		cerr << "Generic exception in Mysql Database" << endl;
    		//TRACE("%s \n",ex.what());			
    		cerr << ex.what() << endl;
    	}
    }//UpdateDB
    
    ////////////////////////////////HELPERS/////////////////////////////////////
    void CIDAdmin::UcharToStr(UCHAR *ucDataBuffer, ULONG ulDataBufLen, char *str)
    {
    	ULONG i = 0;
    	char bytetochar[3] ="";
    	char Temp[1024] ="";
    	
    	
    	for (i=0;i<ulDataBufLen;i++)
    	{
    		_itoa(ucDataBuffer[i],bytetochar,16);
    		if (ucDataBuffer[i]<=0x0F)strcat(Temp,"0");
    		strcat(Temp,bytetochar);
    	}
    	
    	memcpy(str,Temp,ulDataBufLen*2);
    	str[ulDataBufLen*2] = 0;
    	
    }//UcharToStr
    
    //void CIDAdmin::dprint(string s)
    //{
    //	cerr << s << endl;
    //}//dprint
    ////////////////////////////////HELPERS/////////////////////////////////////
    
    //void main(int argc,char* argv[])
    //{
    //	string sUsage="Usage: idadmin read\n or\n iadmin write value";
    //	string param;
    //	param=argv[1];
    //	
    //	if (param.compare("write")==0)
    //	{
    //		if (argc!=5) {
    //			cerr << sUsage << endl;
    //		}
    //
    //		CIDAdmin* admin=new CIDAdmin();
    //		char* id=argv[2];
    //		CString surname=argv[3];
    //		CString name=argv[4];
    //		admin->enlistNew(id,&surname,&name);
    //	}
    //	else if (param.compare("read")==0)
    //	{
    //		CIDAdmin* admin=new CIDAdmin();
    //		admin->readExistingFromCard();
    //	}
    //	else
    //	{
    //		cerr<< sUsage << endl;
    //	}
    //}//main
    
    
    int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
    {
    	int nRetCode = 0;
    
    	// initialize MFC and print and error on failure
    	if (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0))
    	{
    		// TODO: change error code to suit your needs
    		_tprintf(_T("Fatal Error: MFC initialization failed\n"));
    		nRetCode = 1;
    	}
    	else
    	{	
    
    		CString sUsage="Usage: idadmin read\n or\n iadmin write value";
    		CString param;
    		param=argv[1];
    		
    		if (param.Compare("write")==0)
    		{
    			if (argc!=5) {
    				cerr << sUsage << endl;
    			}
    
    			CIDAdmin* admin=new CIDAdmin();
    			char* id=argv[2];
    			CString surname=argv[3];
    			CString name=argv[4];
    			admin->enlistNew(id,&surname,&name);
    		}
    		else if (param.Compare("read")==0)
    		{
    			CIDAdmin* admin=new CIDAdmin();
    			admin->readExistingFromCard();
    		}
    		else
    		{
    			cerr<< sUsage << endl;
    		}
    
    	}
    
    	return nRetCode;
    }

  2. #2
    Registered User
    Join Date
    Dec 2007
    Posts
    214

  3. #3
    "Why use dynamic memory?"
    Join Date
    Aug 2006
    Posts
    186
    i hate those. But usually in my winapi projects, the reasons are :
    1-u didnt write the constructor
    2-u used a function from a library that you did not actually import
    "C makes it easy to shoot yourself in the foot; C++ makes it harder, but when you do, it blows away your whole leg."-Bjarne Stroustrup
    Nearing the end of finishing my 2D card game! I have to work on its 'manifesto' though <_<

  4. #4
    Malum in se abachler's Avatar
    Join Date
    Apr 2007
    Posts
    3,189
    Quote Originally Posted by Hussain Hani
    Why use dynamic memory?
    Because for the vast majority of the computer age, people have not had enough memory to fully run their applications entirely in RAM. Dynamic memory lets you run a program even if it exceeds your ram without crashing.
    Until you can build a working general purpose reprogrammable computer out of basic components from radio shack, you are not fit to call yourself a programmer in my presence. This is cwhizard, signing off.

  5. #5
    Registered User
    Join Date
    Oct 2001
    Posts
    2,129
    Quote Originally Posted by abachler View Post
    Because for the vast majority of the computer age, people have not had enough memory to fully run their applications entirely in RAM. Dynamic memory lets you run a program even if it exceeds your ram without crashing.
    That doesn't make sense.

    Maybe you're talking about virtual memory?
    Last edited by robwhit; 12-28-2007 at 08:50 AM.

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