Re: How to...
Re: How to...
- Subject: Re: How to...
- From: Ken Thomases <email@hidden>
- Date: Thu, 09 Aug 2012 13:51:31 -0500
On Aug 9, 2012, at 1:29 PM, Jens Alfke wrote:
> On Aug 9, 2012, at 10:00 AM, Charlie Dickman <email@hidden> wrote:
>
>> NSTask *ls = [[NSTask alloc] init];
>> NSFileHandle *stdIn = [NSFileHandle fileHandleForReadingAtPath: txtFilePath];
>> [ls setStandardInput: stdIn];
>> [ls setLaunchPath: @"/usr/bin/say"];
>> [ls launch];
>> [ls release];
>>
>> My problem is that the command speaks the text in the file when the task is launched but not anything written to it subsequently.
>
> Yeah, when the NSFileHandle hits EOF on the file it will propagate the EOF to the task, which will then exit.
>
> What you want instead is to make your own NSStream that isn't tied to a file. But looking at the NSTask and NSFileHandle APIs, I don't see how you can attach an NSStream to a task...
The correct thing to do is to use a pipe to send data to the task. You can keep that open as long as you like and keeping writing new data. However, you (Charlie) also wrote:
> I have also looked into using an NSPipe but it doesn't seem to add anything.
You want to look again because that should work. However, there's no reason to believe that the "say" command will speak the data in dribs and drabs as you write it. The man page says that, when input is not a TTY, the text is spoken all at once. So, presumably it will not speak until you close the pipe and it sees EOF and knows it has all of the data.
If NSSpeechSynthesizer has problems, you might look into the Speech Synthesis Manager. Either way, I would not expect that you could work around the problems indefinitely using the "say" command, since it surely uses those APIs under the hood. (The man page actually states that it uses the Speech Synthesis Manager.)
Regards,
Ken
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| References: | |
| | >How to... (From: Charlie Dickman <email@hidden>) |
| | >Re: How to... (From: Jens Alfke <email@hidden>) |