Re: [Vala] string <-> bytes conversion in Vala

[Jaroslav Šmíd <dataman64bit gmail com>]

I've reported bug month ago about string conversion funtions (like 
g_iconv). I don't know if they fixed it. Before you use it, check 
bugzilla if solved (can't remember bug #).

On 12/30/2010 12:51 AM, Anatol Pomozov wrote:
> Hi
>
> On Thu, Dec 23, 2010 at 12:37 AM, Anatol Pomozov
> <anatol pomozov gmail com>  wrote:
> > Hi,
> >
> > I manipulate with strings in my application such as storing/reading
> > to/from binary files. And I need to convert a string to/from array of
> > bytes. What is the best way of doing it in Vala?
> >
> > Looking into string class http://valadoc.org/glib-2.0/string.html I
> > see a method called string#to_utf8() that converts string to array of
> > chars. But I cannot find any other methods.
> >
> > So I have 2 questions:
> >   - How to convert a string to array of chars in encoding different
> > from UTF8. Something like this one
> > http://download.oracle.com/javase/6/docs/api/java/lang/String.html#getBytes(java.nio.charset.Charset)
> >   - How to convert array of chars/uint8 back to string? Like this one
> > http://download.oracle.com/javase/6/docs/api/java/lang/String.html#String(byte[],
> > java.nio.charset.Charset)
>
> I think I found a way to convert string to bytes in Vala. Actually it
> is as simple as casting string to char* and back. Under the hood
> strings in vala is just a pointer to char.
>
> Here is an example that shows it:
>
>    string hello = "abcd";
>    char* ch = (char*) hello;
>    stdout.printf("%c\n", ch[1]); // Second char, that is 'b'
>
>    char[] bytes = new char[4]; // 3 symbols and null-terminator
>    bytes[0] = '1';
>    bytes[1] = '2';
>    bytes[2] = '3';
>    bytes[3] = 0;
>    string str = (string)bytes;
>    stdout.printf(@"$str\n");
>    stdout.printf("%d\n", (int)str.length); // Prints '3'
>
> WRT question 'how to convert strings to different encodings' I think
> this should help
> http://library.gnome.org/devel/glib/unstable/glib-Character-Set-Conversion.html
> I haven't it used though.
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