unsigned char array -> buffer

**Diez B. Roggisch** · Jul 18 '05, 04:37 PM

Re: unsigned char array -> buffer

Henri Schomaecker wrote:[color=blue]
> as I already wrote, I'm trying to get image binary data into a var holding
> an unsigned char string and then print it directly to the browser.
> I now already did some tries with an array and now found the buffer()
> function. - I thought I would have the solution now and also changed
> stdout to O_BINARY, but still I don't get the data right:
>
> 8<--------8<--------8<--------8<--------8<--------
>
> imgObj = win32com.client .Dispatch("mine .imgsender")
> myImgData = buffer(imgObj.g etImgData())
>
> msvcrt.setmode( sys.stdout.file no(), os.O_BINARY)
> sys.stdout.writ e(myImgData)
>
> 8<--------8<--------8<--------8<--------8<--------
>
> I'm really lost and would be very thankful if someone could help me with
> that.[/color]

That snipplet of code is totally useless, as none of us has your custom
mine.imgsender lying around his harddisk, so we can't possibly know what
data you get, let alone what data you want.

So if you provided us with the actual data that is returned by getImgData we
might be able to help.

--
Regards,

Diez B. Roggisch

**Henri Schomaecker** · Jul 18 '05, 04:37 PM

Re: unsigned char array -> buffer

Hi Diez,

oh, I thought I made it clear: The data is a jpg image.
Let me try to explain it like that:

I create a com object, which loads a jpg image and then I request that image
from the com object with the method getImgData().
As answer to getImageData(), the com object returns a SafeArray of unsigned
char (Bytes).

My problem (no problem with asp and perl, same with php) is, that I would
like to read the imagedata directly into a string of unsigned chars and
then print it to the user agent (webbrowser) in binary mode.

So, it would not really make sense to print the imagedata here ;-) - Sorry
for that confusion.

I hope it's clear now and would be very glad, If maybe you could help me.
Again, many thanks in advance,
yours Henri

Diez B. Roggisch wrote:
[color=blue]
> Henri Schomaecker wrote:[color=green]
>> as I already wrote, I'm trying to get image binary data into a var
>> holding an unsigned char string and then print it directly to the
>> browser. I now already did some tries with an array and now found the
>> buffer() function. - I thought I would have the solution now and also
>> changed stdout to O_BINARY, but still I don't get the data right:
>>
>> 8<--------8<--------8<--------8<--------8<--------
>>
>> imgObj = win32com.client .Dispatch("mine .imgsender")
>> myImgData = buffer(imgObj.g etImgData())
>>
>> msvcrt.setmode( sys.stdout.file no(), os.O_BINARY)
>> sys.stdout.writ e(myImgData)
>>
>> 8<--------8<--------8<--------8<--------8<--------
>>
>> I'm really lost and would be very thankful if someone could help me with
>> that.[/color]
>
> That snipplet of code is totally useless, as none of us has your custom
> mine.imgsender lying around his harddisk, so we can't possibly know what
> data you get, let alone what data you want.
>
> So if you provided us with the actual data that is returned by getImgData
> we might be able to help.
>[/color]

--
| Henri Schomäcker - BYTECONCEPTS, VIRTUAL HOMES
| Datendesign für Internet und Intranet
| http://www.byteconcepts.de
| http://www.virtual-homes.de

**Diez B. Roggisch** · Jul 18 '05, 04:38 PM

Re: unsigned char array -> buffer

Hi,
[color=blue]
> I create a com object, which loads a jpg image and then I request that
> image from the com object with the method getImgData().
> As answer to getImageData(), the com object returns a SafeArray of
> unsigned char (Bytes).
>
> My problem (no problem with asp and perl, same with php) is, that I would
> like to read the imagedata directly into a string of unsigned chars and
> then print it to the user agent (webbrowser) in binary mode.
>
> So, it would not really make sense to print the imagedata here ;-) - Sorry
> for that confusion.[/color]

It will - as one can see what you actually get, instead of what you _want_
to get. AFAIK win32 converts variants to appropriate python types, with
arrays returned as lists - so if things work as documented, you shold get
something like this:

l = ["a", "$", ...]

Making that a (binary) string should be a simple matter of

l.join("")

So I'd like to know what you really get- of cours the first few lines are
sufficient, no need to post a 100kb jpeg binary image.

--
Regards,

Diez B. Roggisch

**Michel Claveau - abstraction méta-galactique non t** · Jul 18 '05, 04:38 PM

Re: unsigned char array -> buffer

Bonsoir !

Hi !

Attention, risque de problème (confusion) avec les chaînes à zéro terminal.

Attention, risk of problem (confusion) with the string with zero terminal.

*sorry for my bad english*

@-salutations
--
Michel Claveau

**Wayne Witzel III** · Jul 18 '05, 04:40 PM

Re: unsigned char array -> buffer

> My problem (no problem with asp and perl, same with php) is, that I would[color=blue]
> like to read the imagedata directly into a string of unsigned chars and
> then print it to the user agent (webbrowser) in binary mode.
>[/color]
# this example assumes you are using PIL
# this example assume mod_python, but can be easily modified.
def displayJpeg():
im = Image.Open(file )
imdata = StringIO()
im.save(imdata, "JPEG")
del im

req.content_typ e = "Content-type: image/jpeg"
return imdata.getValue ()

Hope this helps in some way? I think I might have misunderstood the
question though.

unsigned char array -> buffer

unsigned char array -> buffer

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