[Gambas-user] gb3: writing variables to a string using a memory stream and pointer

[Benoît Minisini]

> My code looks like this:
> 
> ' For writing outgoing UDP data to memory.
> Public data As String
> Public mem As Stream
> 
> ' Create data string for outgoing transaction queue.
> data = Space(8)
> mem = Memory VarPtr(data) For Write
> mem.Begin
>    Write #mem, (Server.DateCurrent + Server.DateUTC) As Float
> mem.Send
> Print data
> 
> It throws signal 11 on the Print statement.
> 
> I have two questions. First is this the correct way to write one or more
> variables to a string in memory, and second what's up with the signal
> 11? I'm using revision 4094 and will update to the newest revision in a
> moment.

Signal 11 means that you try to write at a forbidden memory address.

At first sight, you should be able to write to VarPtr(data)... *BUT* you must 
not.

Because all Gambas strings are READ-ONLY, because they can be shared.

So you must use Alloc() and Free() (like in C) to allocate the memory you want 
to write to.

Regards,

-- 
Benoît Minisini