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

[Jussi Lahtinen]

One more thing... "While Not Eof(hFile)" doesn't work with this case.
Eof() never finds end of "file".

Almost sleeping already...

Jussi



On Sat, Sep 19, 2009 at 02:33, Jussi Lahtinen <jussi.lahtinen at ...626...> wrote:
> 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
>>
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>