[Python-Dev] String conversion issues implementing new curses module method addchstr, etc.

[Heracles]

Funny thing happens when you work in a managed language like .Net or Java for
too long.  You tend to expect that the language will catch any invalid casts
and prevent you from compiling the code.

Guess I need to spend more time doing C coding to get back in to it.

Thank you, this is most helpful, and i will heed your advice about the cast.

Cheers!


Ulrich Eckhardt wrote:
> 
> On Wednesday 25 February 2009, Heracles wrote:
>> addchstr((chtype*)PyString_AsString(pS))
> 
> You are effectively disabling the well-deserved warnings with the cast
> here. 
> Don't do that.
> 
>> Now the thing is that when I make calls from python like so:
>>
>>    curses.addchstr(5,10, "@ < Row 5, Col 10")
> [...]
>> What prints out on the screen is gobledygook not the strings you would
>> expect below.
> [...]
>> Any thoughts on how to correctly convert the PyStringObject arguments to
>> chtype* pointers so that the ncurses library will be able to understand
>> them?
> 
> In this case, I suggest man ncurses:
> 
> | cchar_t
> |    corresponds to chtype.  However it is a structure, because more
> |    data is stored than can fit into an integer.  The characters are
> |    large enough to require a full  integer  value  -  and there may
> |    be more than one character per cell. The video attributes and
> |    color are stored in  separate fields of the structure.  
> 
> I'm pretty sure that you can find functions to generate such a string both 
> from a char-string (with whatever encoding) or a wchar_t-string (using 
> Unicode probably) in the curses library.
> 
> Uli
> 
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