[fpc-devel] TRegistry and Unicode

[Yuriy Sydorov]

On 25.02.2019 20:03, Bart wrote:
> On Lazarus, this no problem, since by default all strings are UTF8
> encoded, so all conversions are lossless.
> 
> In a plain fpc program though on Windows, default encoding is the
> current codepage (cp1252 in my case) and information will get lost
> when you process the result further.

If you just recompile unmodified non-unicode app for Windows, string data loss is imminent if the data is not encoded 
using the current ANSI encoding. Even if you use UnicodeString parameters and result for registry functions.

Just adding a single line to the beginning of the app will solve the data loss:
DefaultSystemCodePage:=CP_UTF8;

I would leave the registry parameters and results as "string" as it is done in other parts of RTL/FCL.
For performance critical functions it is possible to add an overloaded versions of functions which accepts UnicodeString 
parameters. IMO the registry access is not the time critical.

Yuriy.