Strings, string replacing, chars and null pointers... help?

[Sslaxx]

OK, related to http://www.adventuregamestudio.co.uk/yabb/index.php?topic=44702.msg597577 I decided to code up a function to remove illegal characters in filenames in strings (and to replace spaces with underscores). So far, this is what I have:

Code: ags

String StripChars (String ToStrip)
{
 String StrippedTo;
 char StripLook = 0;
 int Count = 0;
 while (Count < ToStrip.Length)
 {
  StripLook = ToStrip.Chars [Count];  // Get the char at the current position in the string to strip.
  if (StripLook == ' ')
  {
   StripLook = '_';
  }
  StrippedTo = StrippedTo.AppendChar (StripLook);
  Count++;
 }
 return (StrippedTo);
}

Except it doesn't work. In the function, on the line that should append the character to the string that is to be returned as a filename-safe version, it's giving a "Null pointer referenced" error. I have a suspicion this might be due to the use of a char in there. But can anyone else help out here?

Thanks.

[Calin Leafshade]

You need to initalise StrippedTo

line 3:

String StrippedTo = "";

[Sslaxx]

You need to initalise StrippedTo

line 3:

String StrippedTo = "";

Yup, figured it out just a minute ago!

[monkey0506]

That's something to keep in mind with the new-style String type is that although you don't use normal pointer nomenclature (ie., no asterisk), it is internally still a pointer, and pointer logic still (very much!) applies.

That does actually make it possible to make String parameters to functions optional, so it certainly has benefits.