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Unresolved External Symbol Error

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delphi_uk

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Unresolved External Symbol Error

Mar 15th, 2007

Hello to you all,

I am having problems with some code that I am working on for a text parsing system from an external *.txt file. The problem seems to stem from the Tokenize function, as I get a:

"LNK2019 error: unresolved external symbol "void __cdecl Tokenize(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,class std::vector<class std::basic_string<char,struct std::char_traits<char>, class std::allocator<char> >, class std::allocator<class std::basic_string<char, struct std::char_traits<char>,class std::allocator<char> > > > &)"

 Help with Code Tags 
 cplusplus Syntax (Toggle Plain Text) 
// stringtest.cpp
 
#include <string>
#include <algorithm>
#include <vector>
#include <iostream>
#include <fstream>
 
using namespace std;
 
void Tokenize(const string& str, vector<string>& tokens);
 
int main()
{
    vector<string> tokens;
 
    char _string[256];
    char inputChar[256];
    string inputString;
    ifstream input;
 
    cout << "Enter name of an existing file: ";
    cin.get( _string, 256 );
 
    input.open( _string );
 
    input.getline( inputChar, 256 );
    cout << inputChar << endl;
    inputString = inputChar;
    cout << inputString << endl << endl;
 
    Tokenize( inputString, token );
    copy( tokens.begin(), tokens.end(), ostream_iterator<string>(cout, ", "));
 
     return 0;
}
 
void Tokenize( const string& str, vector<string>& tokens, const string& delimiters = "|")
{
     // Tokenize taken from [url]http://www.hispafuentes.com/[/url]
     // Skip delimiters at the beginning
     string::size_type lastPos = str.find_first_not_of( delimeters, 0 );
     // Find first "non-delimiter".
     string::size_type pos = str.find_first_of( delimiters, lastPos );
 
     while (string::npos != pos || string::npos != lastPos)
     {
           // Found a token add it to the vector
           tokens.push_back( str.substr(lastPos, pos - lastPos));
           // Skip delimiters. Note the "not_of"
           lastPos = str.find_first_not_of( delimiters, pos);
           // Find next "non-delimiter"
           pos = str.find_first_of( delimiters, lastPos );
      }
}
// stringtest.cpp
 
#include <string>
#include <algorithm>
#include <vector>
#include <iostream>
#include <fstream>
 
using namespace std;
 
void Tokenize(const string& str, vector<string>& tokens);
 
int main()
{
    vector<string> tokens;
 
    char _string[256];
    char inputChar[256];
    string inputString;
    ifstream input;
 
    cout << "Enter name of an existing file: ";
    cin.get( _string, 256 );
 
    input.open( _string );
 
    input.getline( inputChar, 256 );
    cout << inputChar << endl;
    inputString = inputChar;
    cout << inputString << endl << endl;
 
    Tokenize( inputString, token );
    copy( tokens.begin(), tokens.end(), ostream_iterator<string>(cout, ", "));
 
     return 0;
}
 
void Tokenize( const string& str, vector<string>& tokens, const string& delimiters = "|")
{
     // Tokenize taken from [url]http://www.hispafuentes.com/[/url]
     // Skip delimiters at the beginning
     string::size_type lastPos = str.find_first_not_of( delimeters, 0 );
     // Find first "non-delimiter".
     string::size_type pos = str.find_first_of( delimiters, lastPos );
 
     while (string::npos != pos || string::npos != lastPos)
     {
           // Found a token add it to the vector
           tokens.push_back( str.substr(lastPos, pos - lastPos));
           // Skip delimiters. Note the "not_of"
           lastPos = str.find_first_not_of( delimiters, pos);
           // Find next "non-delimiter"
           pos = str.find_first_of( delimiters, lastPos );
      }
}

Thank you very much in advance,

Delphi

Last edited by delphi_uk : Mar 15th, 2007 at 7:50 pm.

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John A

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Re: Unresolved External Symbol Error

Mar 15th, 2007

How in the world did you get it to compile? For one thing, you'll need to #include <iterator> if you intend on using ostream_iterator.

 Help with Code Tags 
 cplusplus Syntax (Toggle Plain Text) 
int main()
{
    vector<string> tokens;
 
    char _string[256];
    char inputChar[256];
    string inputString;
    ifstream input;
 
    cout << "Enter name of an existing file: ";
    cin.get( _string, 256 );
 
    input.open( _string );
 
    input.getline( inputChar, 256 );
    cout << inputChar << endl;
    inputString = inputChar;
    cout << inputString << endl << endl;
 
    Tokenize( inputString, token ); // add an 's' to 'token'
int main()
{
    vector<string> tokens;

    char _string[256];
    char inputChar[256];
    string inputString;
    ifstream input;
    
    cout << "Enter name of an existing file: ";
    cin.get( _string, 256 );
    
    input.open( _string );
    
    input.getline( inputChar, 256 );
    cout << inputChar << endl;
    inputString = inputChar;
    cout << inputString << endl << endl;
    
    Tokenize( inputString, token ); // add an 's' to 'token'

 Help with Code Tags 
 cplusplus Syntax (Toggle Plain Text) 
void Tokenize( const string& str, vector<string>& tokens, const string& delimiters = "|")
{
    // Tokenize taken from [url]http://www.hispafuentes.com/[/url]
    // Skip delimiters at the beginning
    string::size_type lastPos = str.find_first_not_of( delimeters, 0 ); // you're spelling 'delimiters' wrong
void Tokenize( const string& str, vector<string>& tokens, const string& delimiters = "|")
{
    // Tokenize taken from [url]http://www.hispafuentes.com/[/url]
    // Skip delimiters at the beginning
    string::size_type lastPos = str.find_first_not_of( delimeters, 0 ); // you're spelling 'delimiters' wrong

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delphi_uk

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Re: Unresolved External Symbol Error

Mar 15th, 2007

•

Originally Posted by joeprogrammer

How in the world did you get it to compile? For one thing, you'll need to #include <iterator> if you intend on using ostream_iterator.

I didnt manage to get it compile thats why I was getting the error. Thanks for the advice on the iterator, the site that I took the code snippet from did not have that header in the sample code.

•

Originally Posted by joeprogrammer

Help with Code Tags

cplusplus Syntax (Toggle Plain Text)
    Tokenize( inputString, token ); // add an 's' to 'token'
Tokenize( inputString, token ); // add an 's' to 'token'

My appologies on the spelling mistake, that was human error as I copied the code from my laptop to the desktop, in the original program this was correct.

•

Originally Posted by joeprogrammer

Help with Code Tags

cplusplus Syntax (Toggle Plain Text)
void Tokenize( const string& str, vector<string>& tokens, const string& delimiters = "|")
{
    // Tokenize taken from [url]http://www.hispafuentes.com/[/url]
    // Skip delimiters at the beginning
    string::size_type lastPos = str.find_first_not_of( delimeters, 0 ); // you're spelling 'delimiters' wrong
void Tokenize( const string& str, vector<string>& tokens, const string& delimiters = "|") { // Tokenize taken from [url]http://www.hispafuentes.com/[/url] // Skip delimiters at the beginning string::size_type lastPos = str.find_first_not_of( delimeters, 0 ); // you're spelling 'delimiters' wrong

Again this is due to inaccuracies in copying the program.

However non of these issues that were brought up solved the issue of the LNK2019 error.

Also thank you very much for the fast response, I have lurked on these forums and used some solutions for quite some time, however this is the first time I have needed to ask a question.

Delphi

Last edited by delphi_uk : Mar 15th, 2007 at 8:15 pm.

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Re: Unresolved External Symbol Error

Mar 15th, 2007

Another note: you should place your default parameter thingy in the function prototype instead of the actual function implementation. This is likely what's causing the linker errors.

[edit]

The actual reason for the linker errors is this:

 Help with Code Tags 
 cplusplus Syntax (Toggle Plain Text) 
void Tokenize(const string& str, vector<string>& tokens);
void Tokenize(const string& str, vector<string>& tokens);

You never included the third parameter, delimiters. No wonder the linker choked up.

Last edited by John A : Mar 15th, 2007 at 8:32 pm.

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Join Date: Oct 2006

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delphi_uk

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Re: Unresolved External Symbol Error

Mar 15th, 2007

Brilliant! Thank you so much, I really shouldn't code when I am tired.

Thank you again for your help!

Delphi

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