Re: accessing newly-created files
Re: accessing newly-created files
- Subject: Re: accessing newly-created files
- From: Allan Odgaard <email@hidden>
- Date: Mon, 19 Apr 2004 23:23:02 +0200
On 19. Apr 2004, at 22:23, David Piasecki wrote:
I tried creating a named pipe, but I'm having some trouble reading
from it. A simple example works just fine for something like cat, but
I get a broken pipe error when attempting to read it in as an image in
Objective-C.
That sucks! Most likely NSImage does something like first opening the
file to read the header, then close and re-open later to re-read the
file, but this time decode the image data or similar which would not
work for a named pipe :-/
You can take over the loading by using initForIncrementalLoad and
incrementalLoadFrom
Data:complete:, but that's too much work IMHO.
I'm going to try simply reading in the file the standard C/C++ way and
passing the bytes to the NSImage. Is that what you were originally
thinking? I'll let you know if it works.
I had hoped that the named pipe would work w/o any tweaks -- bug seeing
that NSImage is incompatible with a FIFO and that you are forced to
read all into an NSData, you can let your helper program (creating the
image) write to stdout (instead of a file) and then use popen() instead
of mkfifo(). This might save a line or two of code and does then not
require a name in the filesystem.
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