Hi,all
how to judge whether what the pointer links to is string or not?
say, I have a struct in program in C.
typedef struct {
char *Name;
...
} stuA ;
main() {
stuA p;
...
}
I have to judge whether the member Name has been initialized or not?How to do?
thanks.
Assign it to NULL when you create it and then check that.
__ &n bsp; ___ & nbsp; &nb sp;   ;
/\ \ __ &nbs p; /\_ \   ; & nbsp;
\_\ \/\_\ ____ _ __\//\ \ __ __&n bsp; __
/'_` \/\ \/\_ ,`\ / __`\\ \ \ /\ \/\ \ /'__`\
/\ \_\ \ \ \/_/ /_/\ \_\ \\_\ \_\ \ \_/ |/\ __/
\ \___,_\ \_\/\____\ \____//\____\\ \___/ \ \____\
\/__,_ /\/_/\/____/\/___/ \/____/ \/__/ \/____/
&n bsp; I have a BAD figlet& nbsp;addiction.
Thanks for your answer.Originally posted by dizolve
Assign it to NULL when you create it and then check that.
But the problem is it is not created in my program.
I just provide a function, and my user will create the strA and use my function, so I think I can just do with the checking inside my function.
>>I just provide a function, and my user will create the strA and use my function,
Then the user should initialise it. If they don't, it's their fault
When all else fails, read the instructions.
If you're posting code, use code tags: [code] /* insert code here */ [/code]
If they don't initialize it to NULL, then it could point at anything making it impossible to say if it's pointing at something valid. Plus that would make the program highly unstable (iow: It might crash).
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Yes, that is why I want to check it in my program.Originally posted by Magos
If they don't initialize it to NULL, then it could point at anything making it impossible to say if it's pointing at something valid. Plus that would make the program highly unstable (iow: It might crash).
Because I think it is the provider's responsibility to check it,even I can ask the user to do it.
