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gets() and getchar()

 
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Guest








gets() and getchar()
PostPosted: Mon Nov 08, 2004 9:19 am     Reply with quote

I could use getchar() get individual ASCII data from RS232, but I could not use gets() function. what is the matter, I used this for testing

send 'RB' from rs232

used

char b; b1[30];
b=getchar()
if(b=='R')
output_high(PIN_a2);


and

gets(b1);
b=b1[0];
if(b=='R')
output_high(PIN_a2);


first code works, second didi not?
Ttelmah
Guest







Re: gets() and getchar()
PostPosted: Mon Nov 08, 2004 9:29 am     Reply with quote

Anonymous wrote:
I could use getchar() get individual ASCII data from RS232, but I could not use gets() function. what is the matter, I used this for testing

send 'RB' from rs232

used

char b; b1[30];
b=getchar()
if(b=='R')
output_high(PIN_a2);


and

gets(b1);
b=b1[0];
if(b=='R')
output_high(PIN_a2);


first code works, second didi not?

Gets, requires a line feed to terminate the string. Hence you would have to send 'RB', and then an <enter>, before the gets version will work.

Best Wishes
Guest








PostPosted: Mon Nov 08, 2004 9:42 am     Reply with quote

Thank you Ttelmah, according to your suggestion, if I want to send several strings, like,
char a[10], b[10], c[10] from RS232
then
after send the a[10], I have to send a '\r' right? '\r\' is a return right?

and then afetr b[10] a '\r' afer c[10] a'\r' and then

I could use gets() like
char a1[10], b1[10],c1[10];
gets(a1);
gets(b1);
gets(c1);

to get the transfered data rght?

thank you.
Guest








PostPosted: Mon Nov 08, 2004 9:49 am     Reply with quote

what I meaning in the last one is for multiple strings receives.
krakatau



Joined: 19 Feb 2009
Posts: 9

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PostPosted: Wed Apr 01, 2009 2:38 am     Reply with quote

THANKS A LOT GUYS. i was required it.
thanksssssss
maybe thanks sent very years later. Wink
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