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 19:42:31 -0400
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
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