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Link Error

Posted on 2004-04-04
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Last Modified: 2012-05-04
Hi,

I am getting the following link errors:

Linking...
LIBCD.lib(wincrt0.obj) : error LNK2001: unresolved external symbol _WinMain@16
Debug/Project2.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.

Any ideas on this?

Ryan

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Question by:RySk8er30
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Expert Comment

by:jkr
Comment Utility
With the vast information you have given about the project type, all that remains is pointing you to http://support.microsoft.com/default.aspx?scid=kb;en-us;125750 ("PRB: Error LNK2001: '_WinMain@16': Unresolved External Symbol")
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Author Comment

by:RySk8er30
Comment Utility
I'm still confused.
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LVL 86

Expert Comment

by:jkr
Comment Utility
Me too. And, even worse, my crystal ball is on repair.
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Author Comment

by:RySk8er30
Comment Utility
I have a couple of files...here they are...

Bank.cpp

#include <conio.h> //Used for getche();
#include <windows.h> //Used for system("cls");
#include <fstream.h> //Used for infile and outfile
#include "Time.h"
#include "Account.h"
#include "Utility.h"
#include <iostream.h>

void main() {

      //Prototype Declarations
      void intro();

      //Local Variables
      Account currAcct;

      //Implementation
      intro();
      currAcct.verifyAcct();

}

void intro() { //Function which prints introduction page.

      /*

      Function Name: Intro
      Purpose: To display an introduction page
      Parameters:
            Input: none
            Input & Output: none
            Output: none
      Return Value: void
      Data Members Accessed: none
      Data Members Modified: none
      Non-local Variables Used: none
      Functions Called: none

      */

      //Local Variables
      Time t;
      
      lower();
      cout << CENTER << char(201) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(187) << endl;
      cout << CENTER << char(186) << "                                     " << char(186) << endl;
      cout << CENTER << char(186) << "        Welcome to Ryan's Bank       " << char(186) << endl;
      cout << CENTER << char(186) << "                                     " << char(186) << endl;
      cout << CENTER << char(186) << "           Do you trust me?          " << char(186) << endl;
      cout << CENTER << char(186) << "                                     " << char(186) << endl;
      cout << CENTER << char(200) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(205) << char(188) << endl;
      cout << CENTER << endl;
      cout << t.getDateAndTime();
      pause();

} //End intro Function

Utility.h...

#include <conio.h> //used for getche();
#include <windows.h>
#include "Constants.h" //used for CENTER, ClearScreen(),
#include <iostream.h> //used for cout;
#include <iomanip.h>
#include <stdlib.h> //used for atof()
#include <math.h> //used for atof()
#include <string.h> //used for strlen()

static void pause () {

      cout << CENTER << " " <<       "     Press any key to continue...    " << flush;
      getche();
      ClearScreen;

}

static void lower () {

      cout << "\n\n\n\n\n\n\n" << endl;

}

static int getPin () {

      int pinNum = 0;
      char pinChar[5];
      int i = 0;
      char temp;

      do {

            cout << flush;
            temp = getch();

            switch (temp) {

                  case toascii(48):
                  case toascii(49):
                  case toascii(50):
                  case toascii(51):
                  case toascii(52):
                  case toascii(53):
                  case toascii(54):
                  case toascii(55):
                  case toascii(56):
                  case toascii(57):
                        cout << "*";
                        pinChar[i] = temp;
                        ++i;
                        break;
                  case toascii(8):
                        if (i==0) {
                              cout << "";
                        } else {
                              cout << "\b \b";
                              --i;
                        }
                        break;
                  default:
                        MessageBeep(0xFFFFFFFF);
            }

      }while (i < 4);
      
      pinChar[i] = '\0';

      for (int n = 0; n < 4; n++) {
            
            pinNum = pinNum*10 + (toascii(pinChar[n]) - 48);

      }

      return pinNum;

}

static int getNumOnly () {

      int acctNum = 0;
      char acctChar[5];
      int i = 0;
      char temp;

      do {

            cout << flush;
            temp = getch();

            switch (temp) {

                  case toascii(48):
                  case toascii(49):
                  case toascii(50):
                  case toascii(51):
                  case toascii(52):
                  case toascii(53):
                  case toascii(54):
                  case toascii(55):
                  case toascii(56):
                  case toascii(57):
                        cout << temp;
                        acctChar[i] = temp;
                        ++i;
                        break;
                  case toascii(8):
                        if (i==0) {
                              cout << "";
                        } else {
                              cout << "\b \b";
                              --i;
                        }
                        break;
                  default:
                        MessageBeep(0xFFFFFFFF);
            }

      }while (i < 4);
      
      acctChar[i] = '\0';

      for (int n = 0; n < 4; n++) {
            
            acctNum = acctNum*10 + (toascii(acctChar[n]) - 48);

      }

      return acctNum;

}

static double getCurr () {

      double currNum = 0;
      char currChar[50];
      int i = 0;
      char temp;
      int dec = 0;
      bool exit = false;

      do {

            currChar[i];
            cout << flush;
            temp = getch();
      
                  switch (temp) {

                        case toascii(48):
                        case toascii(49):
                        case toascii(50):
                        case toascii(51):
                        case toascii(52):
                        case toascii(53):
                        case toascii(54):
                        case toascii(55):
                        case toascii(56):
                        case toascii(57):
                              cout << temp;
                              currChar[i] = temp;
                              ++i;
                              --dec;
                              break;
                        case toascii(8):
                              if (i==0) {
                                    cout << "";
                              } else {
                                    cout << "\b \b";
                                    --i;
                              }
                              --dec;
                              break;
                        case toascii(46):
                              cout << temp;
                              currChar[i] = temp;
                              ++i;
                              dec = 2;
                              break;
                        default:
                              MessageBeep(0xFFFFFFFF);
                  }

      }while ((dec != 0) && temp != toascii(13));

      currNum = atof(currChar);

      return currNum;

}

static void center (char string[]) {

      unsigned int len = strlen(string);
      int space = (80 - len)/2;

      for (int i = 0; i < space; i++) {
            cout << " ";
      }

      cout << string << endl;

}

Account.cpp

#include "Utility.h" //used for lower(), pause(), getPin(), center(), getNumOnly()
#include "Constants.h" //used for PER_STR, CENTER, ClearScreen();
#include <stdlib.h> //used for itoa()
#include <fstream.h> //used for ifstream();
#include <string.h>  //used for strcat();
#include <iostream.h>


class Account {

public:
      Account::Account(); //Constructor
      Account::Account(int acctNum, double balance, char *firstName, char *middleInital, char *lastName, int pin, char *acctFile); //Overloaded Constructor
      Account::~Account(); //Destructor
      Account::Account(Account &p); //Copy Constructor
      Account::verifyAcct();

private:
      int acctNum;
      double balance;
      char firstName[PER_STR];
      char middleInital[1];
      char lastName[PER_STR];
      int pin;
      char acctFile[PER_STR];
};

Account::Account() { //Constructor

      acctNum = 1234;
      balance = 0;
      firstName[PER_STR] = '\0';
      middleInital[1] = '\0';
      lastName[PER_STR] = '\0';
      pin = 1234;
      acctFile[PER_STR] = '\0';

} //End Constructor

Account::Account(int acctNum, double balance, char *firstName, char *middleInital, char *lastName, int pin, char *acctFile) { //Overlaoded Constructor

      acctNum = acctNum;
      balance = balance;
      firstName = firstName;
      middleInital = middleInital;
      lastName = lastName;
      pin = pin;
      acctFile = acctFile;

} //End Overloaded Constructor



Account::Account(Account &p) { //Copy Constructor

      p.acctNum = acctNum;
      p.balance = balance;
      p.firstName[PER_STR] = firstName[PER_STR];
      p.middleInital[1] = middleInital[1];
      p.lastName[PER_STR] = lastName[PER_STR];
      p.pin = pin;
      p.acctFile[PER_STR] = acctFile[PER_STR];

} //End Copy Constructor

Account::~Account() { //Destructor

} //End Destructor

Account::verifyAcct() {

      bool exit = false;

      do {

      lower();
      center("Please enter your four digit account number: ");
      cout << endl << setw(37) << " ";
      acctNum = getNumOnly();
      cout << endl << endl;
      center("Please enter your four digit pin number: ");
      cout << endl << setw(37) << " ";
      pin = getPin();

      _itoa(acctNum, acctFile, 10);

      strcat(acctFile, ".txt");

      ifstream infile;

      //Tries to open the file.  If it does not exist, it does not create one.
      infile.open(acctFile, ios::out|ios::nocreate);
      
      //If the account does not exist, prompt user to create one.
      
      if (!infile) {
            ClearScreen;
            lower();
            center("Invalid account...");
            cout << endl << endl;
            pause();
            ClearScreen;
      }

      infile >> acctNum;
      infile >> balance;
      infile >> lastName;
      infile >> firstName;

      //Closes the file
      infile.close();

      } while (!exit);


}

Constants.h

#define ClearScreen system("cls")
#define PER_STR 50
#define CENTER setw(22)

Time.h

class Time {
private:
      int year,
            month,
            day,
            dayOfWeek,
            hour24,
            hour12,
            minute,
            second;
      char timeCode[8];
      char ampm[3];
      char mos[10];
      char dOWeek[10];

public:
      // Constructors
      Time();
      Time(int year, int mos, int day, int hour, int min, int sec);
      Time(char * tCode);
      ~Time(); // Destructor
      void reset(); // to reset to current time
      char * getTimeCode();
      int getYear();
      int getMonthAsInt();
      char * getMonthAsString();
      int getDay();
      int getDayOfWeekAsInt();
      char * getDayOfWeekAsString();
      int getHour24();
      int getHour12();
      char * getAMPM();
      int getMinute();
      int getSecond();
      char * getDate();
      char * getTime();
      char * getDateAndTime();
};


Here are the errors:

Bank.obj : error LNK2001: unresolved external symbol "public: __thiscall Time::~Time(void)" (??1Time@@QAE@XZ)
Bank.obj : error LNK2001: unresolved external symbol "public: char * __thiscall Time::getDateAndTime(void)" (?getDateAndTime@Time@@QAEPADXZ)
Bank.obj : error LNK2001: unresolved external symbol "public: __thiscall Time::Time(void)" (??0Time@@QAE@XZ)
LIBCD.lib(wincrt0.obj) : error LNK2001: unresolved external symbol _WinMain@16
Debug/Project2.exe : fatal error LNK1120: 4 unresolved externals

Ryan
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Accepted Solution

by:
jkr earned 125 total points
Comment Utility
Well, the key is that you are using a console application and not a GUI - go to the project settings, pick the "Link" tab and see the text field at teh bottom. Locate '/subsystem:windows' nd make that read '/subsystem:console', this will fix the 'WinMain' problem. As for the 'Time' related errors - do you have a 'time.cpp' file and if so, did you add that to your project?
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Author Comment

by:RySk8er30
Comment Utility
Hi,

I have a time.h file, adn a time.obj file.  That is all I have been given.  I have added it to my project.

Ryan
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Author Comment

by:RySk8er30
Comment Utility
Hi,

It actually works now.  I must have choose a Windows Application instead of a Console Application.  Thank you for your help (except for the sarcasm).

Ryan
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LVL 86

Expert Comment

by:jkr
Comment Utility
Thank you!

> except for the sarcasm

Well, that IMHO was appropriate and hearty :o)
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