On 2008-06-29 17:13:36 +0100, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> said:
On 29 Jun., 13:15, Michael Hopkins <[EMAIL PROTECTED]
research.com> wrote:
Hi all
I have a question about using the classes in base to redirect standard
output to a file without too much hassle or re-writing of code. I have
classes that print themselves to standard output like this:
[ someObject show ];
..but would like to be able to redirect this behaviour within code and
possibly in response to user input. Something like...
[ outputFile appendedWith:[ someObject show ]];
I suspect that NSPipe and/or NSFileHandle might be involved but welcome
any tips.
TIA
Michael
--
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Hopkins Research Touch the Future
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Some de-facto standard is that objects derived from NSObject should
respond to - (NSString *) description which returns a user-readable
description.
Then, you can write
[[NSFileHandle fileHandleWithStandardOutput] writeData:[[object
description] dataUsingEncoding:NSUTF8StringEncoding]];
If you prefer to mix OpenSTEP and POSIX:
printf("%s\n", [[object description] UTF8String]);
You could also pack that into a Macro (similar to NSLog which first
builds a formatted string and then writes to StandardErrlr).
What you also could do in main():
freopen(stdout, "path to file", "w");
-- hns
Thanks for the ideas. Will think about these.
The 'show' method is implemented directly as printf() or uses C
functions in a separate library that use printf(), so that will not be
straightforward easy to achieve unless I have misunderstood you, which
is quite possible as I'm relatively new to the OpenStep API.
Was hoping to use Cocoa/GNUstep goodness to make it a simple task. Any
other ideas short of re-implementing the functions to use fprintf() and
parameterising the file to send to? Would overriding the 'description'
method to call [ self show ] achieve this result?
TIA
M
--
______________________________________________
Hopkins Research Touch the Future
______________________________________________
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