Re: Using NSPipe to get system command output
Re: Using NSPipe to get system command output
- Subject: Re: Using NSPipe to get system command output
- From: Charlie Dickman <email@hidden>
- Date: Mon, 13 Aug 2012 19:34:31 -0400
So why doesn't it work???
On Aug 13, 2012, at 7:08 PM, Ken Thomases wrote:
> On Aug 13, 2012, at 5:09 PM, Jens Alfke wrote:
>
>> On Aug 13, 2012, at 2:17 PM, Charlie Dickman <email@hidden> wrote:
>>
>>> int vmDataLength = 0;
>>> do {
>>> vmData = [vmRead availableData];
>>> vmDataLength = [vmData length];
>>> } while (vmDataLength != 0);
>>
>> Don't you mean "== 0" on the final line?
>> Also, spin-loops like this are a really bad idea — this loop is going to consume something like 100% CPU. If you have to loop like this, run the current run loop in between tests.
>
> This isn't a spin loop and he has the termination condition correct. -[NSFileHandle availableData] blocks if there's no data available. It returns a zero-length NSData on end-of-file.
>
> Regards,
> Ken
>
Charlie Dickman
email@hidden
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