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 19:32:59 -0400
This is just test code to see if I can actually get the vm_stat data. It is run only under the debugger 1 or 2 steps at a time. When I have the concept down I will modify it.
No, I actually mean != 0, see below - it is the description of how reading available data from a NSFileHandleForReading...
Return Value
The data currently available through the receiver.
Discussion
If the receiver is a file, returns the data obtained by reading the file from the file pointer to the end of the file. If the receiver is a communications channel, reads up to a buffer of data and returns it; if no data is available, the method blocks. Returns an empty data object if the end of file is reached. Raises NSFileHandleOperationException if attempts to determine file-handle type fail or if attempts to read from the file or channel fail.
On Aug 13, 2012, at 6:09 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.
>
> —Jens
Charlie Dickman
email@hidden
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