| Title: | Atari ST, TT, & Falcon |
| Notice: | Please read note 1.0 and its replies before posting! |
| Moderator: | FUNYET::ANDERSON |
| Created: | Mon Apr 04 1988 |
| Last Modified: | Tue May 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 1433 |
| Total number of notes: | 10312 |
Hi, I'm not sure how to duplicate this but, sometimes, when you use the printf function under MWC on the atari, it appears to buffer the output data before it is displayed on the screen. This causes weird problems when trying to trace a problem, because your printf's are not output immediately, hence you may be in a different function when the data is output. It may be a result of using Cconws and printf in the same program, but i'm not sure. Any help would be greatly appreciated. Thanks in advance, Andy.
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 624.1 | MWC buffers output to stdout | OLDTMR::WALLACE | Tue Oct 03 1989 12:54 | 33 | |
Yes MWC does buffer the output of a printf. You can cause the output
buffer to be flushed (ie:send buffer to screen) in any one of the
following ways -
1 - Calling getc() or scanf() will "flush" the buffer.
2 - A \n (newline) in the output stream (string) will flush the
buffer.
3 - Calling fflush(stdout) will flush the buffer. (I don't guarantee
thats the correct function name and syntax, but I believe it
is. stdout is defined in stdio.h)
Soooo, prompting for input works ok -
printf( "Hit return when ready. " );
getc( );
Outputing informational messages (ie:status and debug information)
works IF you get used to putting your \n at the end of strings and not
the beginning of strings -
printf( "First call\n" );
Call_1( );
printf( "Second call\n" );
Call_2( );
Outputing multiple strings on one line MUST have a call to fflush() (or
whatever the actual name of the function is) -
printf( "Sector count - ");
for( i = 1; i < 9; i++ ) {
format( i );
printf( "%d ", i );
fflush( stdout );
}
Hope this helped,
Ray
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| 624.2 | PRNSYS::LOMICKAJ | Jeff Lomicka | Tue Oct 03 1989 12:58 | 3 | |
I can confirm that "fflush( stdout)" is the correct function name. Be sure to "#include <stdio.h>". | |||||