Problem involving a pointer/passing a pointer through a function

edit: took out the code since I posted updated code a few posts down

> FileOpen(&fileinp, dataFile, &length);
You need an extra * in several places then.

Code:

---

void FileOpen(FILE **fileptr, char *file_name, int *lengthptr)
{
  printf("Please enter the filename you wish to open : ");
  scanf("%s", file_name);

  *fileptr = fopen(file_name, "r");
 
  if (*fileptr == NULL)
  {
      printf("An error has occurred while attempting to open the file\n");
      exit(-1);
  }

  while(fgetc(*fileptr) != EOF)
  {
      length++;
  }
 
 
}

---

ooooh, so that extra * in the prototype is what was needed, Ok. Thanks alot!

Ok, so the extra * allowed the file input to work out well, but I'm still having issues with the length pointer counter actually incrementing.

Code:

---

void FileOpen(FILE *fileptr, char *file_name, int *lengthptr)
{
  printf("Please enter the filename you wish to open : ");
  scanf("%s", file_name);

  fileptr = fopen(file_name, "r");
 
  if (fileptr == NULL)
  {
      printf("An error has occurred while attempting to open the file\n");
      exit(-1);
  }

  while(fgetc(inp1) != EOF)
  {
      length++;
  }
 
 
}

---

I pass the variable by reference "length" to the function, and the value of length is always zero. However, when I copy/paste that exact same code into main and swap out the pointers for the regular variables it works perfectly fine. Am I not allowed to do an increment to lengthptr? Am I missing something that would keep lengthptr from incrementing?

Code:

---

while ( fgetc(fileinput) != EOF
{
    length++;
}

---

(this is what I would put into main, which would work out fine)

Same thing - use a *

Though watch out for
++*p
is different from
*p++