A bug in NewLISP-tk ?

[newBert]

When I launch this code :

Code Select Expand

(print "Please, enter a number : ")
(set 'nn (eval-string (read-line)))

In the NewLISP console, I get :

Please, enter a number : 2

newLISP v.8.8.8 on Win32 MinGW, execute 'newlisp -h' for more info.



> nn

2

>

but in the NewLISP-tk console :

newLISP v.8.8.8 on Win32 MinGW.



> Please, enter a number : 2

2

> nn

nil

>

[HPW]

Not sure how you launch it, when I load it from a file i get:

newLISP v.8.8.8 on Win32 MinGW.



> Please, enter a number : 10



> nn

10

> Please, enter a number : 48



> nn

48

>

After the input of the number I had to press enter twice!

[newBert]

Ok, I launched the code from a text/script editor (in this case : ConTEXT).

If I load the script with NewLISP-tk (File/Load..) it works as you said and nn get the right value.

Strange ? :)



P.S.: Is there a good, light and easy-to-use script-editor for NewLISP (or other), aside ConTEXT or Crimson's Editor ?

[HPW]

Strange ? :)

Maybe Lutz can explain better, but newLISP-Tk is sometime a bit more tricky than the plain console.

P.S.: Is there a good, light and easy-to-use script-editor for NewLISP (or other), aside ConTEXT or Crimson's Editor ?

I use Ultraedit for all my Programming-Languages. Not light and not free but powerfull. I can configure highlighting/autocomplete etc. for 20 different languages at once.



But editors are a matter of taste. ;-)

[Lutz]

Strange ? :)

I have tried this on both, Win32 and Mac OS X newLISP-tk and cannot see the problem newbert is seeing loading this code from the newLISP-tk frontend or executing the second statement interactively:

Code Select Expand


(print "enter a number:")
(set 'nn (eval-string (read-line)))


Code Select Expand


newLISP v.8.8.9 on Win32 MinGW.

> enter a number:1234

>
> nn
1234
>


Lutz

[Lutz]

may be newbert's Windows installation does something special with Std I/O, read this in the newlisp-tk manual: http://newlisp.org/downloads/newlisp-tk.html#special">http://newlisp.org/downloads/newlisp-tk.html#special



in the 3rd and 4th paragraphs



Lutz

[newBert]

I have tried this on both, Win32 and Mac OS X newLISP-tk and cannot see the problem newbert is seeing loading this code from the newLISP-tk frontend or executing the second statement interactively

Sorry, for my (poor) english. I'll try to sum up more clearly ;)



Here is the code : (set 'n (eval-string (read-line)))



- Interactively, it works right on both console newlisp and newlisp-tk :

newLISP v.8.8.9 on Win32 MinGW.



> (set 'n (eval-string (read-line)))

55

55

> n

55

>

I put the code in a script file named test.lsp, for instance. I launch the newlisp-tk console and I load the script into it (Menu File/Load ...) :



- In this way, it still works right but I must type <Enter> twice :

newLISP v.8.8.9 on Win32 MinGW.



> 55



> n

55

>

- Now if I launch the script file (test.lsp) in newlisp-tk with the help of a batch file or with the very usefull run.exe or from a text editor :

newLISP v.8.8.9 on Win32 MinGW.



> 55

55

> n

nil

>

- If I launch the script in newlisp by double-clicking on the file, there is no problem :

55

newLISP v.8.8.9 on Win32 MinGW, execute 'newlisp -h' for more info.



> n

55

>

[Lutz]

The read-line is interfering with 'silent' used when loading programs when using newlisp-tk and is also interfering with std I/O when newLISP-tk starts up and established connection with newlisp in the backend.



The first enter you have to do when loading your program after newlisp-tk is up, is necessary to come out of the 'silent'.



You can simulate this by adding an additional 'read-line'

Code Select Expand


; porgram newbert
(print "enter a number:")
(read-line)
(set 'nn  (eval-string (read-line)))


Now doing:

Code Select Expand


c:> newlisp-tk newbert


on the command line or from a batch file will work but you have to hit enter twice, because the first 'read-line' is used up by the load/setup process.



My suggesrtions is not to mix  standard I/O method of input/output with a newLISP-tk GUI program. Either use 'print' and 'read-line' and use the standalone newlisp.exe executable or use the newLISP-tk GUI frontend, but then use the Tcl/Tk GUI facilities to do input/output dialogs with your program.



Lutz

[newBert]

The first enter you have to do when loading your program after newlisp-tk is up, is necessary to come out of the 'silent'.



You can simulate this by adding an additional 'read-line'

Yes, it works, thanks for the reply.



Your recommendation :

My suggesrtions is not to mix standard I/O method of input/output with a newLISP-tk GUI program.

seems to me absolutely obvious now !



Bertrand