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Thanks again for the suggestions. I have a lot to learn!

I think I'm starting to understand. Thank you every one who patiently explained and suggested alternatives. I'm using macros because I'm passing large-ish objects around (bitmaps) and for performance reasons I don't want newLISP to create a copy of these objects every time I call a function passing ...

I am a newLISP noob. There is almost nothing I understand of the culture. I thought I was using the style suggested in the article http://www.newlisp.org/downloads/newlisp_manual.html#define-macro . I thought it meant: use letex with args to avoid variable capture. I'm still confused. I don't unders...

Hi and thanks both for replying. I'm still trying to puzzle it out.

I don't quite get why your fix, Lutz, affects just the lst variable. Why aren't the other variables susceptible to the same problem?

I don't understand what I'm doing wrong here. Is it variable capture? Using the example from the define-macro description in the newLISP doc I wrote two identical test functions, apart from the name of the parameter: (define-macro (dolist-while) (letex (var (args 0 0) lst (args 0 1) cnd (args 0 2) b...

Yes, that demo is the point from which I started hacking. I'll pursue my bitmap effort a little further and see what FPS I get. I'll probably have further questions. If I think the end result is likely to be of any interest to anyone else I will make it freely available. Thank you again.

Lutz, I appreciate you taking the time to answer my newbie questions. I found this worked for me: (define (set-pixel x y r g b) (let (i (* (+ x (* y WIDTH)) 3)) (cpymem (pack "bbb" r g b) (+ (address rgb-buf) i) 3))) Your suggestion meant rewriting the entire bitmap to change one pixel, which seemed...

Hi Lutz, thank you for the suggestion. In view of what you say can you suggest the most appropriate data type to use to pass to glDrawPixels? I want to create a contiguous array of RGB binary byte values to pass to this function and I want to manipulate the contents of this buffer in LISP, to displa...

I'm trying to set a character value in a string containing zeros. Is the following behaviour correct? newLISP v.10.3.3 on OSX IPv4/6 UTF-8, execute 'newlisp -h' for more info. > > (set 's "abc") "abc" > (setf (s 1) "X") "X" > s "aXc" > (set 's "\000\000\000") "\000\000\000" > s "\000\000\000" > (len...

Hi Lutz, Thanks for the info. I'm trying it now but I haven't succeeded in getting anything on the screen yet. I'll keep at it. Ant

Is it possible to use glDrawPixels from a newLISP script? I want to display an image I've constructed in an array of RGB values.

If it is possible, could you point me to the documentation or an example?

If it isn't possible, am I trying to do something newLISP is not designed for?