Pointer Argument

[sudhansukanungo]

Hi All,
I ve written few lines of code to examines whether the handed over read position lies within the file. But while compiling im getting two error

beinhaltetPosition.cpp:22: error: too few arguments to function âbool beinhaltetPosition.cpp:70: error: at this point in file

the code is

#include<iostream.h>
#include<stdio.h>
#include<fstream.h>
long mLaenge;
long mNummernkreis;
 //mLaenge = 20;
 
 // examines whether the handed over read position lies within the file.
 //@parm long * | pPos | the read position which can be examined.
//@rvalue false | the read position does not lie within the file.
//@rvalue true | the read position lies within the file.
 
 unsigned short gibLaenge()
 {
         return mLaenge;
 }
 
 bool beinhaltetPosition(long * pPos)
 {
        mLaenge = 20;
        long lUntergrenze = gibLaenge();
        long lObergrenze = 11 - gibLaenge();
       if(*pPos < lUntergrenze || *pPos >= lObergrenze)
         {
                  return false;
         }
    else
                      return true;
      }
 
      int main()
      {
        /* FILE *pFile;
       //ifstream * pFile;
        // int c;
       //fpos_t pos;
    //int pos;
     /*
          fstream file_op("sus.txt","r");
         if (pFile==NULL) perror ("Error opening file");
         else
        {
           c = fgetc (pFile);
           cout<<"Enter the position"<<endl;
           cin>>pos;
           pFile.seekg(pos);
                if(pFile.seekg(pos))
              cout<<"Right"<<endl;
          else
           cout<<"Wrong"<<endl;
           //fgetpos (pFile,&pos);
           for (n=0;n<3;n++)
      {
             fsetpos (pFile,&pos);
              c = fgetc (pFile);
              //printf ("2nd character is %c\n",c);
           }
          // fclose (pFile);
       }*/
 
      bool t;
      t=beinhaltetPosition(long * pPos);
 
       return 0;
     }
 

Can any body help me?

[Meetee]

bool t;
t=beinhaltetPosition(long * pPos);

Hi,

You need to pass some long value or a pointer pointing to some long value in beinhaltetPosition(....) function.

Regards

[sudhansukanungo]

Hi,

You need to pass some long value or a pointer pointing to some long value in beinhaltetPosition(....) function.

Regards

Thanks zodilla58
I passed a long pointer pointing to a file.

[weaknessforcats]

There is some mighty odd code here.

First, there is iostream.h which is the pre-ANS C++ used until 1998. Are you in fact coding using the C++ of 10 years ago??

Second, there is an fsetpos() in the code to set a stream position. Unfortunately, the argument can only be the return from a previous fgetpos() but there is no fgetpos() in the code.

Third, there is no check that fsetpos() actually worked. It probab;y didn't.


You should do a seekg() to the end of the file. Then do a tellg(). The return from tellg() will tell you the number of bytes in the file.