subject:"\[Tkinter\-discuss\] clipboard and bytes"

Re: [Tkinter-discuss] clipboard and bytes

2018-03-02 Thread Michael Lange

Hi,

Vasilis Vlachoudis  wrote:

> I works within the same process.
> When I try to launch it twice, so I can have clipboard exchange between
> different processes
> 
> I get the following exception:
> Traceback (most recent call last):
>   File "/usr/lib/python3.6/tkinter/__init__.py", line 1702, in __call__
> return self.func(*args)
>   File "foo.py", line 41, in paste
> res = root.tk.call(clip)
> _tkinter.TclError: invalid command name "139879786444744cp"

oh sure, I did not think about *that* :)
This is not going to work of course with two separate program instances.

> I did something else.
> I've used the binascii.b2a_hex() and a2b_hex() functions
> to convert the bytes() to a hex string and the reverse (double in size,
> and a useless UTF-8 conversion, encode/decode) 
> This way it works but not a clean approach,
> since I am copying in the clipboard binary data in a form of ascii.

Actually I believe, if you got it working, that it is probably the most
"clean" approach, at least as long as you stay within Tk; I guess that
other software might only receive "junk data" from the clipboard, though.

> Is there a way to create a new mime format and advertise
> the format somehow in the clipboard?

Quoting "man clipboard" again:

  " Type specifies the form in which the selection is to be returned (the
  desired ``target'' for conversion, in ICCCM terminology), and should be
  an atom name such as STRING or FILE_NAME; see the Inter-Client
  Communication Conventions Manual for complete details. Type defaults to
  STRING.

  The format argument specifies the representation that should be used to
  transmit the selection to the requester (the second column of Table 2 of
  the ICCCM), and defaults to STRING.(...)

  The format argument is needed only for compatibility with clipboard
  requesters that do not use Tk. If the Tk toolkit is being used to
  retrieve the CLIPBOARD selection then the value is converted back to a
  string at the requesting end, so format is irrelevant."

So I guess that the answer is probably "yes" here, but it sounds to me
like a non-trivial task that might require a considerable amount of
extra-investigation. 

> I've been reading and debugging a bit what firefox is doing and how the
> selection is treated. I couldn't find anywhere how to handle binary
> data, but firefox when you copy an image it creates customs mime types
> like image/png that contain the data in a form '0x39 0xf7 0xb8 0x8f
> 0xff ...'

Probably they are doing something of that ICCCM compliant things, but I
really don't know anything about that.

> Now I don't know if it is tk/tcl or _tkinter that makes this
> interpretation or the data are really ascii written in hex format, but
> I think even like this it can work for me.

I think it is surely tcl/tk that does it, tkinter only calls tk's
clipboard commands. However tkinter in some situations *might* do some
"mangling" to the data that tk returns (e.g. in the example from my
previous post, when the "embedded" helper func would return a list,
self.tk.call() would turn this into a tuple). 

Best regards

Michael

.-.. .. ...- .   .-.. --- -. --.   .- -. -..   .--. .-. --- ... .--. . .-.

Fascinating, a totally parochial attitude.
-- Spock, "Metamorphosis", stardate 3219.8
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Re: [Tkinter-discuss] clipboard and bytes

2018-03-01 Thread Vasilis Vlachoudis

I've been reading and debugging a bit what firefox is doing and how the 
selection is treated.
I couldn't find anywhere how to handle binary data, but firefox when you copy 
an image it
creates customs mime types like image/png that contain the data in a form
'0x39 0xf7 0xb8 0x8f 0xff ...'
Now I don't know if it is tk/tcl or _tkinter that makes this interpretation or 
the data are really
ascii written in hex format, but I think even like this it can work for me.

An interesting feature is the selection_get(type='TARGETS') which returns all 
possible
mime/formats available.

V.

From: Vasilis Vlachoudis
Sent: Thursday, March 01, 2018 17:13
To: Michael Lange; tkinter-discuss@python.org
Subject: RE: [Tkinter-discuss] clipboard and bytes

I did something else.
I've used the binascii.b2a_hex() and a2b_hex() functions
to convert the bytes() to a hex string and the reverse (double in size, and
a useless UTF-8 conversion, encode/decode)
This way it works but not a clean approach,
since I am copying in the clipboard binary data in a form of ascii.

Is there a way to create a new mime format and advertise
the format somehow in the clipboard?

Vasilis

From: Vasilis Vlachoudis
Sent: Thursday, March 01, 2018 16:42
To: Michael Lange; tkinter-discuss@python.org
Subject: RE: [Tkinter-discuss] clipboard and bytes

Many thanks!

I works within the same process.
When I try to launch it twice, so I can have clipboard exchange between 
different processes

I get the following exception:
Traceback (most recent call last):
  File "/usr/lib/python3.6/tkinter/__init__.py", line 1702, in __call__
return self.func(*args)
  File "foo.py", line 41, in paste
res = root.tk.call(clip)
_tkinter.TclError: invalid command name "139879786444744cp"

I saw in the documentation that by default it uses the UTF8STRING as type
I've tried to force it to type="STRING" but with no success

From: Tkinter-discuss 
[tkinter-discuss-bounces+vasilis.vlachoudis=cern...@python.org] on behalf of 
Michael Lange [klappn...@web.de]
Sent: Thursday, March 01, 2018 00:12
To: tkinter-discuss@python.org
Subject: Re: [Tkinter-discuss] clipboard and bytes

On Wed, 28 Feb 2018 20:42:51 +0100
Michael Lange <klappn...@web.de> wrote:

(...)
> So at least this primitive seems to work. Maybe you can use this
> technique to achieve what you want.

Or maybe this slightly modified example comes closer to what you are
looking for:

from tkinter import *

root = Tk()

def copy(string):
def cp():
return string
copyfunc = (root.register(cp))
return(copyfunc)

root.clipboard_clear()
root.clipboard_append(copy(b'foobar'), type='foo')

def paste(ev):
clip = root.clipboard_get(type='foo')
res = root.tk.call(clip)
print('->', res, type(res))

root.bind('', paste)
root.mainloop()

Regards

Michael

.-.. .. ...- .   .-.. --- -. --.   .- -. -..   .--. .-. --- ... .--. . .-.

"... freedom ... is a worship word..."
"It is our worship word too."
-- Cloud William and Kirk, "The Omega Glory", stardate
   unknown
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Re: [Tkinter-discuss] clipboard and bytes

2018-03-01 Thread Vasilis Vlachoudis

I did something else.
I've used the binascii.b2a_hex() and a2b_hex() functions
to convert the bytes() to a hex string and the reverse (double in size, and
a useless UTF-8 conversion, encode/decode) 
This way it works but not a clean approach,
since I am copying in the clipboard binary data in a form of ascii.

Is there a way to create a new mime format and advertise
the format somehow in the clipboard?

Vasilis



From: Vasilis Vlachoudis
Sent: Thursday, March 01, 2018 16:42
To: Michael Lange; tkinter-discuss@python.org
Subject: RE: [Tkinter-discuss] clipboard and bytes

Many thanks!

I works within the same process.
When I try to launch it twice, so I can have clipboard exchange between 
different processes

I get the following exception:
Traceback (most recent call last):
  File "/usr/lib/python3.6/tkinter/__init__.py", line 1702, in __call__
return self.func(*args)
  File "foo.py", line 41, in paste
res = root.tk.call(clip)
_tkinter.TclError: invalid command name "139879786444744cp"


I saw in the documentation that by default it uses the UTF8STRING as type
I've tried to force it to type="STRING" but with no success


From: Tkinter-discuss 
[tkinter-discuss-bounces+vasilis.vlachoudis=cern...@python.org] on behalf of 
Michael Lange [klappn...@web.de]
Sent: Thursday, March 01, 2018 00:12
To: tkinter-discuss@python.org
Subject: Re: [Tkinter-discuss] clipboard and bytes

On Wed, 28 Feb 2018 20:42:51 +0100
Michael Lange <klappn...@web.de> wrote:

(...)
> So at least this primitive seems to work. Maybe you can use this
> technique to achieve what you want.

Or maybe this slightly modified example comes closer to what you are
looking for:

from tkinter import *

root = Tk()

def copy(string):
def cp():
return string
copyfunc = (root.register(cp))
return(copyfunc)

root.clipboard_clear()
root.clipboard_append(copy(b'foobar'), type='foo')

def paste(ev):
clip = root.clipboard_get(type='foo')
res = root.tk.call(clip)
print('->', res, type(res))

root.bind('', paste)
root.mainloop()



Regards

Michael


.-.. .. ...- .   .-.. --- -. --.   .- -. -..   .--. .-. --- ... .--. . .-.

"... freedom ... is a worship word..."
"It is our worship word too."
-- Cloud William and Kirk, "The Omega Glory", stardate
   unknown
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Re: [Tkinter-discuss] clipboard and bytes

2018-03-01 Thread Vasilis Vlachoudis

Many thanks!

I works within the same process.
When I try to launch it twice, so I can have clipboard exchange between 
different processes

I get the following exception:
Traceback (most recent call last):
  File "/usr/lib/python3.6/tkinter/__init__.py", line 1702, in __call__
return self.func(*args)
  File "foo.py", line 41, in paste
res = root.tk.call(clip)
_tkinter.TclError: invalid command name "139879786444744cp"


I saw in the documentation that by default it uses the UTF8STRING as type
I've tried to force it to type="STRING" but with no success


From: Tkinter-discuss 
[tkinter-discuss-bounces+vasilis.vlachoudis=cern...@python.org] on behalf of 
Michael Lange [klappn...@web.de]
Sent: Thursday, March 01, 2018 00:12
To: tkinter-discuss@python.org
Subject: Re: [Tkinter-discuss] clipboard and bytes

On Wed, 28 Feb 2018 20:42:51 +0100
Michael Lange <klappn...@web.de> wrote:

(...)
> So at least this primitive seems to work. Maybe you can use this
> technique to achieve what you want.

Or maybe this slightly modified example comes closer to what you are
looking for:

from tkinter import *

root = Tk()

def copy(string):
def cp():
return string
copyfunc = (root.register(cp))
return(copyfunc)

root.clipboard_clear()
root.clipboard_append(copy(b'foobar'), type='foo')

def paste(ev):
clip = root.clipboard_get(type='foo')
res = root.tk.call(clip)
print('->', res, type(res))

root.bind('', paste)
root.mainloop()



Regards

Michael


.-.. .. ...- .   .-.. --- -. --.   .- -. -..   .--. .-. --- ... .--. . .-.

"... freedom ... is a worship word..."
"It is our worship word too."
-- Cloud William and Kirk, "The Omega Glory", stardate
   unknown
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Re: [Tkinter-discuss] clipboard and bytes

2018-02-28 Thread Michael Lange

On Wed, 28 Feb 2018 20:42:51 +0100
Michael Lange  wrote:

(...)
> So at least this primitive seems to work. Maybe you can use this
> technique to achieve what you want.

Or maybe this slightly modified example comes closer to what you are
looking for:

from tkinter import *

root = Tk()

def copy(string):
def cp():
return string
copyfunc = (root.register(cp))
return(copyfunc)

root.clipboard_clear()
root.clipboard_append(copy(b'foobar'), type='foo')

def paste(ev):
clip = root.clipboard_get(type='foo')
res = root.tk.call(clip)
print('->', res, type(res))

root.bind('', paste)
root.mainloop()



Regards
 
Michael


.-.. .. ...- .   .-.. --- -. --.   .- -. -..   .--. .-. --- ... .--. . .-.

"... freedom ... is a worship word..."
"It is our worship word too."
-- Cloud William and Kirk, "The Omega Glory", stardate
   unknown
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Re: [Tkinter-discuss] clipboard and bytes

2018-02-28 Thread Michael Lange

Hi,

On Wed, 28 Feb 2018 10:59:31 +
Vasilis Vlachoudis  wrote:

(...)
> In python3 Pickler requires a byte stream so I replaced all StringIO()
> to BytesIO() and the targets with bytes target1 = b""
> Copying to clipboard work ok (or I believe so)
> Pasting, clipboard_get() returns a str not bytes and the Unpickler
> fails. Also If I try to encode("UTF-8") the clip data also it fails.

according to man clipboard it is possible create custom data types to be
stored in the tk clipboard:
  "You can put custom data into the clipboard by using a custom -type
  option. This is not necessarily portable, but can be very useful. The
  method of passing Tcl scripts this way is effective, but should be mixed
  with safe interpreters in production code."

I set up a (rather useless) example how this can be done:

##
from tkinter import *

root = Tk()

def copy(string):
def cp():
return 666
copyfunc = (root.register(cp))
return(copyfunc)

root.clipboard_clear()
root.clipboard_append(copy('foobar'), type='foo')

def paste(ev):
clip = root.clipboard_get(type='foo')
res = root.tk.call(clip)
print('->', res, type(res))

root.bind('', paste)
root.mainloop()
#

When I run this script and hit F1 I get the following output:

  $ python3 test5.py
  -> 666 

So at least this primitive seems to work. Maybe you can use this
technique to achieve what you want.

Regards

Michael

.-.. .. ...- .   .-.. --- -. --.   .- -. -..   .--. .-. --- ... .--. . .-.

Without followers, evil cannot spread.
-- Spock, "And The Children Shall Lead", stardate 5029.5
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[Tkinter-discuss] clipboard and bytes

2018-02-28 Thread Vasilis Vlachoudis

Hi all,

I took the decision to convert my program to python3. I am stuck with the 
clipboard handling str vs bytes
How can I get/receive bytes instead of str with the clipboard?

What I was doing up to now was opening a StringIO stream dump a header and the 
objects as a dump from Pickler

Up to now in python V2. it was working like this
Copy to clilpboard:
target1 = ""
sio = io.StringIO()
sio.write(target1)
pickler = Pickler(sio)
pickler.dump()
root.clipboard._clear()
root.clipboard_append(sio.getvalue())

Paste from clipboard:
clip = root.clipboard_get(selection='CLIPBOARD')
if clip.startswith(target1):
   pickler = Unpickler(io.StringIO(clipboard[len(target1):]))
   ...
elif...

In python3 Pickler requires a byte stream so I replaced all StringIO() to 
BytesIO() and
the targets with bytes target1 = b""
Copying to clipboard work ok (or I believe so)
Pasting, clipboard_get() returns a str not bytes and the Unpickler fails. Also 
If I try
to encode("UTF-8") the clip data also it fails.

Thanks in advance
Vasilis

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Re: [Tkinter-discuss] clipboard and bytes

Re: [Tkinter-discuss] clipboard and bytes

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Re: [Tkinter-discuss] clipboard and bytes

Re: [Tkinter-discuss] clipboard and bytes

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[Tkinter-discuss] clipboard and bytes

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