Issue with 'unsigned char const *'

wxPython Dev
1

Hello,

I’m trying to use StyledTextCtrl_MarkerDefineRGBAImage function,
but I can’t find out how the image must be passed.

From scintilla documention I get that it is supposed to be

SCI_MARKERDEFINERGBAIMAGE(int markerNumber, const char *pixels)

so I thought it should work by providing a string

img = ‘\x00\x00\x00\x00’
editor.RGBAImageSetWidth(14)
editor.MarkerDefineRGBAImage(0,img)

``

then I tried passing a list

img = [0,0,0,0]
editor.MarkerDefineRGBAImage(0,img)

``

and finally I tried using ctypes with byte and ubyte

import ctypes
img = ctypes.c_ubyte*4
img.from_buffer_copy(’\x00\x00\x00\x00’)
<c_ubyte_Array_4 object at 0x7f9902a5c9e0>
for i in img():
print i

``

0
0
0
0

editor.MarkerDefineRGBAImage(0,img())

editor.MarkerDefineRGBAImage(0,ctypes.byref(img()))

editor.MarkerDefineRGBAImage(0,ctypes.pointer(img()))

``

but all returned the same error
Traceback (most recent call last):
File “”, line 1, in
File “/usr/lib/python2.7/dist-packages/wx-3.0-gtk2/wx/stc.py”, line 6371, in MarkerDefineRGBAImage
return _stc.StyledTextCtrl_MarkerDefineRGBAImage(*args, **kwargs)TypeError: in method ‘StyledTextCtrl_MarkerDefineRGBAImage’, expected argument 3 of type 'unsigned char const *'

So, how do I provide a ‘unsigned char const *’?

Thank you
Claudia

2

By default sip is expecting an int or int-compatible object for unsigned char values, and it doesn’t know whether it should be a pointer to a single value or an array of values, so it just takes the safest choice. I can tweak some things in the wrappers to allow it to accept buffer-compatible objects, but in the meantime, is there any reason that MarkerDefineBitmap won’t work for you?

···

–

Robin Dunn

Software Craftsman

On Tuesday, January 30, 2018 at 6:41:29 AM UTC-8, cfrank2512@gmail.com wrote:

img = ‘\x00\x00\x00\x00’
editor.RGBAImageSetWidth(14)
editor.MarkerDefineRGBAImage(0,img)

``

img = [0,0,0,0]
editor.MarkerDefineRGBAImage(0,img)

``

import ctypes
img = ctypes.c_ubyte*4
img.from_buffer_copy(‘\x00\x00\x00\x00’)
<c_ubyte_Array_4 object at 0x7f9902a5c9e0>
for i in img():
print i

``

editor.MarkerDefineRGBAImage(0,img())

editor.MarkerDefineRGBAImage(0,ctypes.byref(img()))

editor.MarkerDefineRGBAImage(0,ctypes.pointer(img()))

``

Hello,
I’m trying to use StyledTextCtrl_MarkerDefineRGBAImage function,
but I can’t find out how the image must be passed.
From scintilla documention I get that it is supposed to be
SCI_MARKERDEFINERGBAIMAGE(int markerNumber, const char *pixels)
so I thought it should work by providing a string
then I tried passing a list
and finally I tried using ctypes with byte and ubyte
0
0
0
0
but all returned the same error
Traceback (most recent call last):
File “”, line 1, in
File “/usr/lib/python2.7/dist-packages/wx-3.0-gtk2/wx/stc.py”, line 6371, in MarkerDefineRGBAImage
return _stc.StyledTextCtrl_MarkerDefineRGBAImage(*args, **kwargs)TypeError: in method ‘StyledTextCtrl_MarkerDefineRGBAImage’, expected argument 3 of type ‘unsigned char const *’

So, how do I provide a ‘unsigned char const *’?

Thank you
Claudia

3

https://github.com/wxWidgets/Phoenix/issues/716

···

–

Robin Dunn

Software Craftsman

http://wxPython.org

4

Hello Robin,

is there any reason that MarkerDefineBitmap won’t work for you?

probably not, to be honest, I’m just testing the functions provided by stc, one by one to get a better understanding how scintilla works

and this was the first function which wasn’t working as I expected.

Thank you for considering the buffers/arrays as an option.

Cheers

Claudia

5

That was quick - thank you very much and I can confirm it is working well with byte string.
And congratulation to the official 4.0 release - well done.

Cheers
Claudia

···

Am Dienstag, 30. Januar 2018 22:57:23 UTC+1 schrieb Robin Dunn:

https://github.com/wxWidgets/Phoenix/issues/716

–

Robin Dunn

Software Craftsman

http://wxPython.org

6

This was another one of those times where I surprised myself a little because something I did years ago for this project made implementing a new fix or feature very simple and easy. :slight_smile: Thanks for confirming.

···

On Tuesday, February 6, 2018 at 3:40:40 AM UTC-8, cfrank2512@gmail.com wrote:

That was quick - thank you very much and I can confirm it is working well with byte string.

–

Robin Dunn

Software Craftsman