[fpc-devel] Small Wstrings problem

Michael Van Canneyt michael at freepascal.org
Mon Jun 27 13:14:02 CEST 2005

On Mon, 27 Jun 2005, Florian Klaempfl wrote:

> Martin Schreiber wrote:
>> On Sunday 26 June 2005 20.07, Florian Klaempfl wrote:
>>> I didn't merge the widestring memory handling to fixes and it wasn't
>>> wrong to do so, see the current failures :)
>> They don't work with checkpointer (see bug report 4125).
> Anybody a suggestion how we should handle this? There was a bug report
> (http://www.freepascal.org/bugs/showrec.php3?ID=2423) that FPC causes problems
> when working with variants and widestrings and passing them to windows.

In delphi, on windows the function NewWideString calls SysAllocStringlen
to allocate the wide string. On Linux, a simple getmem is used.

When freeing the wide string, SysFreeString is used.

I don't see any other way to do it. To make the code 'system
independent' you could introduce a set of procedural variables
GetWideStringMem : Function (Len : Integer) : Pointer;
FreeWideString : procedure(var P : Pointer);

Which are set to defaults on non-win32, and which are set to 2 functions
that call the appropriate windows functions.


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