How to assign some buffer for a string?

[peceha]

I need to use AddPart_() command and (if I understood it correctly) the modified/final path will be stored in first variable passed to that function (ie. Dirname).
The problem starts here because that variable (buffer in memory) must be long enough to accommodate new path string.
How to do this in blitz?

Thanks

[Daedalus]

The Maxlen keyword is used for reserving string space:

Maxlen myName$ 512

You can then use & to pass the address of the reserved string to any OS calls that need to write to it:

succ.l = Addpart_(&myName$, &myPart$, 512)

This should write the result back to myName$. I *think* however, that Blitz's temporary string buffer will miss the update, meaning that using myName$ directly afterwards won't reflect the result. Instead, you would need to read the string directly:

NPrint Peek.s(&myName$)

Or, you could make the change permanent in the variable by reassigning it:

myName$ = Peek.s(&myName$)

[peceha]

It works!!
And you were right about reading the string directly.
Thanks!!

Just small correction :

succ.l = Addpart_(myName$, myPart$, 512)

Needs & in front of each variable.

[Daedalus]

Originally Posted by peceha

It works!!
And you were right about reading the string directly.
Thanks!!

Just small correction :

succ.l = Addpart_(myName$, myPart$, 512)

Needs & in front of each variable.

Oops, yes, of course... I even said it in the text, just forgot to put them in the example. Fixed now, thanks

As an aside, it is possible to use string parameters without the & for system calls where the string is not modified by the function, just not where the string is to be modified by the system. But it's probably best to use the & just in case.