[Gambas-user] using sockets to send binay files

[Olivier Cruilles]

Hi,

May be this email can help you.

---------------------------------------------------------------


On Mon, 1 Dec 2008 06:50:06 am Robert Moss wrote:

Robert this may not be much help to you and I'm not sure how related to your 
problem it is,  but just on the off chance. I struggled with saving a picture 
and retrieving from a postgres field. 

The code I included worked really well for a long time, but in the last couple 
of upgrades though it saves the file ok, it retreives a corrupt image. and I 
get a libpng error (sob sob) and I havn't had time or inclination to re-look 
at it.

Please if/when you figure it out can I have a few pointers.

Regards

Richard



> The ImgData stops writing when it comes to a byte with value &H00 (I
> believe) although I'm pretty sure it doesn't matter how I write the stream,
> once it's read as a String, it becomes terminated by any NULL char. So my
> question is this: How do I read the data from the Socket in binary, write
> it to a stream file in binary, but STILL I MUST be able to split the data
> based on the 2 CRLF's
> 
> On Sun, Nov 30, 2008 at 11:48 AM, Robert Moss 
<the.at.robert at ...626...>wrote:
>> Sorry that's not it, I mis-copied the line, in the actual code it does
>> Mid(sData, p1 + 4)
>> 
>> On Sun, Nov 30, 2008 at 2:39 AM, Doriano Blengino <
>> 
>> doriano.blengino at ...1909...> wrote:
>>> Robert Moss ha scritto:
>>>> I am trying to get an image (or any binary data) downloaded from a
>>> 
>>> website
>>> 
>>>> and into a jpg file. I expect I will need to use the Byte[] datatype,
>>> 
>>> but I
>>> 
>>>> absolutely can NOT use Callbacks when the data comes in this time.
>>>> 
>>>> ...
>>>> 
>>>> DO UNTIL(EOF(#Sock))
>>>>    READ #Sock, sBuf, Lof(Sock)
>>>>    sTotal &= sBuf
>>>> LOOP
>>>> 
>>>> CLOSE #Sock
>>>> 
>>>> 
>>>> p1 = InStr(sTotal, "\r\n\r\n")
>>>> 
>>>> ImgData = Mid(sTotal, p1)
>>>> 
>>>> OPEN "localimg.jpg" FOR OUTPUT CREATE AS #myFile
>>>> WRITE #myFile, ImgData, Len(ImgData)
>>>> CLOSE #myFile
>>> 
>>> I think there is a problem with InStr(...,"\r\n\r\n").
>>> By taking mid$(...,p1), you retain the two CRLFs, which are not good at
>>> the beginning of a jpeg file.
>>> You should get rid of the first 4 characters. May be there are still
>>> other problems, but this is one for sure.
>>> 
>>> Regards,
>>> 
>>> --
>>> Doriano Blengino
>>> 
>>> "Listen twice before you speak.
>>> This is why we have two ears, but only one mouth."
>>> 
>>> 
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Le 10 avr. 2010 à 23:15, Ricardo Díaz Martín a écrit :

> 
> Hi,
> 
> Is there some way to send binary files using gambas sockets? Reading and
> sending byte per byte is too much slow.
> 
> I read old post from Benoit about this and I think it's no possible at this
> time. It's true?
> 
> Regards,
> Ricardo Díaz
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Olivier Cruilles
Mail: linuxos at ...1896...