Subj : fstream - opening a binary file in second obj
To   : borland.public.cpp.borlandcpp
From : D Kat
Date : Mon Oct 25 2004 05:32 pm

Thanks to all the help in this room I was able to clean up code and put all 
of the subroutines that student programmers should not play with in a 
separate source file that they can now load as an obj file in a project. 
However in putting all of the code related to the ISR in this object file I 
had to include the fstream binary file that is opened.  This code now will 
not return anything at all.  So when I step through the code the file stream 
is empty - so before and after wavefile.open wavefile in WATCH looks like
wavefile = {  }.  The ISR is working fine in that the counter in it is 
counting just fine.  I have not played out a sound file yet because I'm 
stuck in not being able to open one.


I have checked, double checked, and keep on checking.  The file is there, 
the name is correct, etc.  I have no idea what or where to check at this 
point.  wavefile is 0.

Any ideas?



fstream wavefile;

int get_stimuli(char *name) //open and read sound file
{
  wavefile.open(name,ios::binary);   //OPEN
  if (!wavefile)
  {
   cout << "\nCannot open file: "<< name << endl;
   return(-1);
  }
  wavefile.seekg(0,ios::end); // goto EOF
  file_length=wavefile.tellg()/2; // get length of file
  wavefile.seekg(0,ios::beg); //goto BOF

  for(int i=0;i<NUMBUF;i++)
  {
   wavefile.read((char*) &wavebuffer[i][0], BUFSIZE*2); // READ file into 
buffer
   if((readlength[i] = wavefile.gcount()/2)!=BUFSIZE)return(file_length);
  }
  return(file_length);
}

.