Char* Replace - GameCreators Forum

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AlexI

19

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Joined: 31st Dec 2004

Location: UK

Posted: 11th Sep 2008 11:51 Edited at: 11th Sep 2008 16:16

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Hi,
How can i do a search & replace on char* from to /

Also / is weird its an escape character i don't know what C++ is to stop that,

Thanks,
Alex

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IanM

Retired Moderator

22

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Joined: 11th Sep 2002

Location: In my moon base

Posted: 11th Sep 2008 15:37

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+ Code Snippet

char* Ptr = MyString; // MyString is your char* pointer
while (*Ptr)
{
   if (*Ptr == '\\')
      *Ptr = '/';
   ++Ptr;
}

It's the backslash that's the escape character - as you can see in the above code, I've had to escape the escape character to detect it.

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AlexI

19

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Joined: 31st Dec 2004

Location: UK

Posted: 11th Sep 2008 16:17

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Thanks

, will test it when i get back from college

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AlexI

19

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Joined: 31st Dec 2004

Location: UK

Posted: 12th Sep 2008 16:29 Edited at: 12th Sep 2008 16:33

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Hi,
Thanks, Any ideas why this code didn't work

Me using code:

+ Code Snippet

// Find & Replace
void find_and_replace( char* &source, char* find, char* replace) {
char* Ptr = source;
while (*Ptr)
{
   if (*Ptr == find)
      *Ptr = replace;
   ++Ptr;
}

}

My errors:

+ Code Snippet

Error	2	error C2040: '==' : 'int' differs in levels of indirection from 'char *'	main.cpp	139

Error	3	error C2440: '=' : cannot convert from 'char *' to 'char'	main.cpp	140

Error	1	error C2446: '==' : no conversion from 'char *' to 'int'	main.cpp	139

Thanks,
Alex

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Lilith

16

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Joined: 12th Feb 2008

Location: Dallas, TX

Posted: 12th Sep 2008 16:53 Edited at: 12th Sep 2008 16:54

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Try

+ Code Snippet

// Find & Replace
void find_and_replace( char* source, char* find, char* replace) {
char* Ptr = source;
while (*Ptr)
{
   if (*Ptr == *find)
      *Ptr = *replace;
   ++Ptr;
}

}

You're trying to compare what a pointer is pointing to by dereferencing Ptr (*Ptr) with the actual value of a pointer. You need to deference the pointer on the right of the == to compare a char to a char.

Lilith, Night Butterfly
I'm not a programmer but I play one in the office

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AlexI

19

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Joined: 31st Dec 2004

Location: UK

Posted: 12th Sep 2008 17:37

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Thanks

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IanM

Retired Moderator

22

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Joined: 11th Sep 2002

Location: In my moon base

Posted: 12th Sep 2008 19:13

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I'd suggest that you change that function slightly - passing a char pointer for the find & replace values gives the incorrect impression that it's a string replacement function, not a character replacement function:

+ Code Snippet

void find_and_replace( char* source, char find, char replace) {
    char* Ptr = source;
    while (*Ptr)
    {
       if (*Ptr == find)
          *Ptr = replace;
       ++Ptr;
    }
}

[b]Utility plug-ins collection (updated 28/08/08) and
http://www.matrix1.demon.co.uk

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