[fpc-pascal] Some RTL functions cry big tears when mixing Pchar and Ansistring/String

md at rpzdesign.com md at rpzdesign.com
Tue Jun 11 04:49:36 CEST 2013

Under Linux using Lazarus 1.0.8/Fpc 2.6.2/Fedora 14 x64:

it seems like mixing Ansistrings and Pchars on certain run time 
functions is a real no-no.

I just spent HOURs, trying to see why I was not getting good program 

Lesson #1: Never call function like Copy( pchar, start, length),

ONLY use Copy( ansistring/string, start, length)

Other functions like PosEx( ) do not generate compiler
errors but you really do NOT want a Pchar to this function,
only an ansistring/string.

Passing a Pchar gives weird, erratic behavior

Maybe the RTL library team could put compiler WARNINGS about only 
allowing for strings/ansistrings
on copy( ), posex( ), and other functions who have really no business 
taking pchar arguments.



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