Concerning release: 33 Subject: Question Title: A Char quickie

initial message posted by John Eikenberry on 2000/03/16 13:30:04

When calling an external function that takes a single char as an argument... extern void SLsmg_write_char (char); Is there anything special that needs to be done. Here's what I currently have: function slsmg_write_char ch arg Char ch external slib "SLsmg_write_char" But this spits out a random character when called. Usually some strange control character. I've tried various things, like passing in an address, a single length string, plus a few others. But with no luck. Any tips. Thanks.

answer posted by Hubert Tonneau on 2000/03/16 13:52:34

In Pliant, a 'Char' data is not an atomic data because it's size is not the same as an 'Int'. As a result, it's always passed by address. Use something like this: function my_slsmg_write_char chnum arg Int chnum external slib "SLsmg_write_char" function slsmg_write_char ch arg Char ch my_slsmg_write_char ch:number If you don't like it, you have to define 'CChar', just as I did for 'CStr'. Should be somethink like this, also I did not test it: type CChar field Int number function 'cast CChar' c -> cc arg Char c ; arg CChar cc implicit cc number := c number function 'cast Char' cc -> cc arg CChar cc ; arg Char c implicit c := character cc:number

answer posted by John Eikenberry on 2000/03/16 14:33:50

Great... I knew it'd be something fairly simple. Thanks for the help.