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How to convert String to char ? [message #12498]

Tue, 06 November 2007 03:26

LiniX
Messages: 7
Registered: October 2007
Location: Thailand

Promising Member

Hi,

i don't know how to convert Upp::String to char*. How to convert ?
(I use EditString to input to String a, I send String a to library function but library function is char* input, i don't know how to convert Upp::String to char*)

and/or

What String type is easy to convert? (String , WString ,etc..)

i am a very newbie.
(Sorry for stupid question)

Thank You
Watchara Kangkun

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Re: How to convert String to char ? [message #12499 is a reply to message #12498]

Tue, 06 November 2007 06:07

andrei-catalin
Messages: 62
Registered: May 2006
Location: Romania

Member

http://www.ultimatepp.org/forum/index.php?t=msg&th=36&am p;start=0&

Andrei

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Re: How to convert String to char ? [message #12508 is a reply to message #12498]

Tue, 06 November 2007 19:08

LiniX
Messages: 7
Registered: October 2007
Location: Thailand

Promising Member

Thank you .

But library function in put is only char*,

How to change const char* to char* ? or can't ?

Thank you
Watchara Kangkun

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Re: How to convert String to char ? [message #12511 is a reply to message #12508]

Tue, 06 November 2007 21:15

mirek
Messages: 13975
Registered: November 2005

Ultimate Member

LiniX wrote on Tue, 06 November 2007 13:08

Thank you .

But library function in put is only char*,

How to change const char* to char* ? or can't ?

Thank you
Watchara Kangkun

You cannot convert String to char *.

The reason is that String interface is created so that efficient reference counted implementation is possible. That excludes this kind of conversion.

If you need to write to String content, you can use StringBuffer though.

String x = "Fun";
StringBuffer sb = x;
char *s = ~sb;
s[1] = 'a';
x = sb;

Note that transfers between StringBuffer and String are very fast, as long as the reference count (if any) is 1.

(Note2: Current String implementation uses reference counting only for long Strings).

Mirek

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Re: How to convert String to char ? [message #12540 is a reply to message #12511]

Thu, 08 November 2007 03:03

LiniX
Messages: 7
Registered: October 2007
Location: Thailand

Promising Member

Mirek ,Thank You Very Much

Watchara Kangkun

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