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: Andy Lee <email@hidden>
- Date: Mon, 13 Aug 2012 19:52:27 -0400
You're very welcome. Although I wonder if you could simply replace the do-while loop with a call to NSTask's waitUntilExit method.
--Andy
On Aug 13, 2012, at 7:42 PM, Charlie Dickman <email@hidden> wrote:
> Andy,
>
> THANK YOU SO MUCH!!
>
> I am glad my inquiry spawned some interest but you have taught me how to fish ;^)
>
> Thanks again
>
> On Aug 13, 2012, at 7:27 PM, Andy Lee wrote:
>
>> Apple seems to have pulled the ancient "Moriarity" example which demonstrates basic use of NSTask, but my cleanup of it should still work.
>>
>> <https://github.com/aglee/MoreArty>
>>
>> --Andy
>>
>> On Aug 13, 2012, at 6:42 PM, Kyle Sluder <email@hidden> wrote:
>>
>>> On Mon, Aug 13, 2012, at 02:17 PM, Charlie Dickman wrote:
>>>> I'm trying to get the output from a vm_stat command using the following
>>>> code. My app hangs in the [vmRead availableData] call as it should if
>>>> there is no data available but it never comes back. What am I doing
>>>> wrong? I have searched through the sample code on apples developer site
>>>> with no luck.
>>>>
>>>> NSPipe *vmPipe = [NSPipe pipe];
>>>> NSFileHandle *vmRead = [vmPipe fileHandleForReading];
>>>>
>>>> [vm setLaunchPath: @"/usr/bin/vm_stat"]; // 1 page = 4096 bytes
>>>> [vm setStandardOutput: vmPipe];
>>>> [vm launch];
>>>> NSData *vmData = nil;
>>>> int vmDataLength = 0;
>>>> do {
>>>> vmData = [vmRead availableData];
>>>> vmDataLength = [vmData length];
>>>> } while (vmDataLength != 0);
>>>
>>>
>>> You can't do this. You need to run the runloop.
>>>
>>> --Kyle Sluder
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>
> Charlie Dickman
> email@hidden
>
>
>
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