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Re: uniform-array-read!

From: William Xu
Subject: Re: uniform-array-read!
Date: Tue, 31 Jan 2006 22:54:58 +0800
User-agent: Gnus/5.110004 (No Gnus v0.4) Emacs/22.0.50 (gnu/linux)

address@hidden (Ludovic Courtès) writes:

> William Xu <address@hidden> writes:
>> Is the following the correct way of using `uniform-array-read!'? Seems
>> it simply hangs there..
>>   (let ((ar (make-uniform-array #\nul length)))
>>     (uniform-array-read! ar sockfd))
> In your example, it can very well be hanging because there is nothing to
> read from SOCKFD (e.g., it's making a blocking `read' system call
> beneath).

Ooh, that was only partial of the codes. Actually i've also written the
codes in C first to make sure we could *read*.

> Using Guile 1.7:

Not in debian yet.. Guile 1.6.7 here.

>   guile> (define a (make-uniform-array #\nul 10))
>   guile> (uniform-array-read! a (open-input-string (string #\001 #\002 
> #\003)))
>   3
>   guile> a
>   #s8(1 2 3 32 51 10 -102 96 48 10)
>   guile>
> IOW, it seems to work fine --- except that:
>  1. The array is not properly initialized;

It is.

>  2. The result is not a string as one would expect from the Guile 1.6
>     manual[*] (in fact it could hardly be a string since internally
>     strings may not contain null characters AFAIK).

What is that "result"? I noticed that in your example, 

   guile> (uniform-array-read! a (open-input-string (string #\001 #\002 #\003)))

The second argument for uniform-array-read! is a string. In my codes, i
tried to read binary data, precisely, a network packet. Does this



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