[Tutor] GIFs Using Tkinter

[Gregor Lingl]

Lloyd Kvam schrieb:

> My guess is that you did this on Windows and did not include "rb" on the
> open call.

Well guessed! Thanks to all of you.
Gregor

> Change the recipe fragment:
>     ...open("icon.gif")...
> to
>     ...open("icon.gif","rb")...
>
> In Windows, the default mode when opening a file is "Text Mode" which
> provides special handling for line mark characters, r"\r\n".  This means
> that bits in your image that accidently match the line handling will get
> mangled.  "rb" opens the file for reading in binary mode.  I believe that
> Microsoft uses raw and cooked to differentiate the two modes of reading
> files.
>
> Gregor Lingl wrote:
>
>> Hi all!
>>
>> I'm trying to use recipe 9.5 from Python Cookbook, which suggests
>> to read gifs from files using base64.encodestring in order to embed 
>> those images into my sourcecode.
>>
>> I've prepared some 20 gifs with Photoshop which are all merely
>> rotated versions of some "master"-gif. (They all are produced in
>> exactly the same way and have (255,255,255) as transparent color.)
>>
>> They all can be used as Tkinter PhotoImages with the file-option
>> perfectly well.
>>
>> However, if I try to use the data-option with strings constructed
>> from those same gifs according to the recipe mentioned above,
>> I observe, that among those gif-images
>> (1) some can be displayed correctly (more than 50%)
>> (2) some are corrupted and are displayed with stripes or other
>> artefacts.
>> (3) and some result in strings only a few characters long
>> which cannot be interpreted as image-data at all.
>>
>> What could be the reason for this annoying behaviour and how
>> can I avoid it.
>>
>> Thanks in advance
>>
>> Gregor
>>
>>
>>
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>