Feeding a wxImage object straight to a zipfile archive?

wxPython Users
1

Howdy folks;
I know there's a combination to do this, but I'm not getting it right.
I've got a wxImage object I want to feed directly into a zipfile
object, avoiding any temp files.

zipfile allows the .writestr option, and I can get a string using
img.GetData(), but the string isn't a necessarily the format a JPEG
file needs to be. Is there a way to convert the GetData() string into
a true Jpeg formatted string?

Alternately, I tried passing cStringIO.StringIO(fooImage.GetData()) to
the zipfile.write() method, but it only likes a filepath to the file,
and not the file object itself.

Any way to avoid creating a temp file? I'm guessing a conversion
routine of some sort for the GetData() value?

···

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  e y e p u l p
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2

EyePulp wrote:

Howdy folks;
I know there's a combination to do this, but I'm not getting it right.
I've got a wxImage object I want to feed directly into a zipfile
object, avoiding any temp files.

zipfile allows the .writestr option, and I can get a string using
img.GetData(), but the string isn't a necessarily the format a JPEG
file needs to be. Is there a way to convert the GetData() string into
a true Jpeg formatted string?

Alternately, I tried passing cStringIO.StringIO(fooImage.GetData()) to
the zipfile.write() method, but it only likes a filepath to the file,
and not the file object itself.

Any way to avoid creating a temp file? I'm guessing a conversion
routine of some sort for the GetData() value?

You can probably do it with PIL, but for now there isn't a way to do it directly with wx.Image as I haven't fully wrapped wxOutputStream to be interchangeable with Python file-like objects...

···

--
Robin Dunn
Software Craftsman
http://wxPython.org Java give you jitters? Relax with wxPython!

3

Hey Robin;
Thanks for the clarification. I went ahead and added the steps to
write the temp file:

wx.BitmapFromImage(outImg).SaveFile(tmpFilePath,wx.BITMAP_TYPE_JPEG)

and just use zipfile.write(), then delete the temp file. It's not too
inefficient, and seemed healthier than adding PIL to the mix for this
particular issue.

Thanks again.

···

On 1/24/07, Robin Dunn <robin@alldunn.com> wrote:

EyePulp wrote:
> Howdy folks;
> I know there's a combination to do this, but I'm not getting it right.
> I've got a wxImage object I want to feed directly into a zipfile
> object, avoiding any temp files.
>
> zipfile allows the .writestr option, and I can get a string using
> img.GetData(), but the string isn't a necessarily the format a JPEG
> file needs to be. Is there a way to convert the GetData() string into
> a true Jpeg formatted string?
>
> Alternately, I tried passing cStringIO.StringIO(fooImage.GetData()) to
> the zipfile.write() method, but it only likes a filepath to the file,
> and not the file object itself.
>
> Any way to avoid creating a temp file? I'm guessing a conversion
> routine of some sort for the GetData() value?
>

You can probably do it with PIL, but for now there isn't a way to do it
directly with wx.Image as I haven't fully wrapped wxOutputStream to be
interchangeable with Python file-like objects...

--
Robin Dunn
Software Craftsman
http://wxPython.org Java give you jitters? Relax with wxPython!

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