OpenEuphoria

Re: DLL Interface

• Posted by SDPringle Nov 17, 2008
• 906 views

In general, it may be faster to just use the limit value, 255 in this case, as the argument to peek(). Then use find() to determine where truncate the sequence:

sequence s 
integer len 
atom ptr 
ptr = allocate( 256 ) 
-- C call using string in ptr goes here. 
s = peek( { ptr, 256 } ) 
free(ptr) 
len = find(0,s) 
if len then 
    s = s[1..len-1] 
else 
    return GET_FAIL -- too long error... 
end if 
return s 

The length of the buffer is always known by the coder and in some cases the length of the string is returned by the underlying C function. Not all C functions terminate the string. We shouldn't assume that the requested string is limited to 255 characters. It is better to fail with an error than to crash the program.

Shawn Pringle