[Gambas-user] Error message from (at least earlier valid) pointer usage.

[Jussi Lahtinen]

OK, now it works! Thanks!
That makes my code more simple than it was, very good!
Only one little disruptive thing... using "File" is little counter
intuitive, but maybe I just don't name it "hFile",
maybe instead "hMyData" or like.

Must go to sleep...

Jussi


2009/9/19 Benoît Minisini <gambas at ...1...>:
>> This code, gives error message "wanted Stream got Long instead":
>>
>> pPOINTS = Alloc(4, 1522)
>> tmp = CalculatePoints(pPOINTS,matrix.Data)
>>
>> ....
>>
>>  For ii = 0 To tmp
>>  tmpPOINT = New POINT
>>  Read #pPOINTS + (ii * 4), tmpPOINT.x    <---- Fails here!
>>  Read #pPOINTS + (ii * 4) + 2, tmpPOINT.y
>>  ...
>>
>> POINT class:
>>
>> Public x As Short = -1
>> Public y As Short
>>
>> There is also rather complicated "_compare" function, but I don't
>> think it matters with this problem.
>>
>>
>> This code worked fine with earlier Gambas 3 revisions.
>> Does this has anything to do with my error?
>>   * NEW: A Pointer can not be used as a stream directly. You must use the
>>  new Memory instruction for that.
>>
>> New feature understandably lacks documentation, so I need help!
>>
>> Jussi
>>
>
> Sorry, all that is work in progress.
>
> I am currently redoing the way Gambas deals with binary data.
>
> So now, to access memory located at a specific pointer, you must do:
>
> Dim pPoints as Pointer
> Dim hFile AS File
>
> hFile = Memory pPoints For Read ' or For Write
> ...
> Close #hFile
>
> Then you use the READ instruction normally, except that hFile has an internal
> memory pointer that is automatically incremented.
>
> The first time, the data is read at address pPoints. But if, for example, you
> read 4 bytes, the next read will occur at address pPoints + 4. And so on until
> the end of the memory or a memory access error.
>
> The syntax of READ and WRITE will change too, and there is an high risk that
> the bytecode format changes, and that projects need to be recompiled.
>
> Regards,
>
> --
> Benoît Minisini
>
> ------------------------------------------------------------------------------
> Come build with us! The BlackBerry® Developer Conference in SF, CA
> is the only developer event you need to attend this year. Jumpstart your
> developing skills, take BlackBerry mobile applications to market and stay
> ahead of the curve. Join us from November 9-12, 2009. Register now!
> http://p.sf.net/sfu/devconf
> _______________________________________________
> Gambas-user mailing list
> Gambas-user at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/gambas-user
>