linker error I can't figure out

[swingkyd]

Hello, I am having trouble with linker error...
This is my first stab at creating inherited objects. I cannot seem to get them working. I get the following errors:

busdes.obj : error LNK2001: unresolved external symbol "public: void __thiscall model::openfile(char *,int)" (?openfile@model@@QAEXPADH@Z)
Debug/bus_program.exe : fatal error LNK1120: 1 unresolved externals [\code]

I've created objects: model & UserInput
(edited code)

[code]  // "model.h"
#ifndef BP_MODEL_H
#define BP_MODEL_H
#include<fstream.h>
class model{
public:
  model();
  void openfile(char*, int);        // opens file &quot;char*&quot; and ignores &quot;int&quot; lines 
};
#endif [\code]

I have a model.cpp file that includes this file with the function: 
[code]openfile(char* filename, int lines){cout<<&quot;test\n&quot;;&quot;[\code]

The code for the child goes something like this:
[code] // &quot;UserInput.h&quot;
#ifndef BP_USERINPUT_H
#define BP_USERINPUT_H
#include <iostream.h>
#include <iomanip.h>
#include &quot;model.h&quot; // needed because of ifndef... 
class UserInput: public model{public: int a=1;};
#endif [\code]
and main goes something like this:
[code]
#include<cstring>
#include<iostream.h>
#include<iomanip>
#include &quot;model.h&quot;
#include &quot;UserInput.h&quot;
int main(){
UserInput ui1; 
ui1.openfile(&quot;myfile.txt&quot;, 0);
return(0);
}

Help would be GREATLY appreciated. I have no idea why this doesn't work.

 

[palbano]

I have a model.cpp file that includes this file with the function:
openfile(char* filename, int lines){cout<<&quot;test\n&quot;;&quot;

void model::openfile(char* filename, int lines){cout<<&quot;test\n&quot;;}

-pete

 

[swingkyd]

pete:
I caught that...I just forgot to write that in...

I still get the same error...

 

[swingkyd]

my problem has mysteriously fixed itself. I believe it had something to do with the header files being traversed more than once...

I just playted around with them until it worked.

Basically, I think that 'model.h' was defined more than once so there were troubles with linking at the end of the day

 

[palbano]

Perhaps the model.cpp file is not installed in the project and is not being built?

-pete