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 Forum index » Off-Topic Area » Programming
Vala and Genie programming
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technosaurus


Joined: 18 May 2008
Posts: 3843
PostPosted: Thu 18 Feb 2010, 20:42    Post subject:  
apart from the 2-3 examples in the devx - there are none as far as I know - maybe something from another distro... did you have to make any patches to compile without glade? I don't recall seeing a --disable-glade or --without-glade option.
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disciple

Joined: 20 May 2006
Posts: 6179
Location: Auckland, New Zealand
PostPosted: Fri 19 Feb 2010, 01:05    Post subject:  
I was lazy, so I hand edited the makefile.
I deleted everything to do with glade, except the line that said something along the lines of HAS_LIBGLADE="yes", which I changed to "no"... I don't know whether I needed to do both those things Smile

One of the comments in the changelog implies that it will still build if you don't have Glade installed, so I imagine it would be fairly easy to add a --disable-glade.
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ljfr

Joined: 23 Apr 2009
Posts: 176
PostPosted: Wed 07 Apr 2010, 05:05    Post subject: New version  
Hi,
A new version released last week:
March 31, 2010: Vala 0.8.0 released
see:http://live.gnome.org/Vala
regards,
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technosaurus


Joined: 18 May 2008
Posts: 3843
PostPosted: Thu 08 Apr 2010, 15:14    Post subject:  
pasang-emas board game was recently rewritten in vala
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technosaurus


Joined: 18 May 2008
Posts: 3843
PostPosted: Sat 05 Jun 2010, 16:12    Post subject:  
TrayIcon template - hacked from Nic's Status Icon Test (still has the same references)
Code:
[indent=4]
 
/* Build with valac --pkg gtk+-2.0 yourfile.gs */
 
uses
    Gtk
 
init
    Gtk.init (ref args)
    var test = new StatusIconTest ()
    test.show_all ()
    Gtk.main ()
 
class StatusIconTest : Widget
 
    trayicon : StatusIcon
    menu : Menu
 
    init
        /* Create tray icon */
        trayicon = new StatusIcon.from_stock(STOCK_HOME)
        trayicon.set_tooltip_text ("Hello, i'm a tooltip !")
        trayicon.set_visible(true)
        trayicon.activate += icon_clicked
        create_menu()
 
        /* Create menu */
    def private create_menu ()
        menu = new Menu()
        var menuItem = new ImageMenuItem.from_stock(STOCK_ABOUT, null)
        menuItem.activate += about_clicked
        menu.append(menuItem)
        var menuItem2 = new ImageMenuItem.from_stock(STOCK_QUIT, null)
        menuItem2.activate += exit_app
        menu.append(menuItem2)
        menu.show_all()
        trayicon.popup_menu += def (button, time)
            show_popup(button, time)
 
        /* Show popup menu */
    def private show_popup (button : uint, time : uint)
        menu.popup(null, null, null, button, time)
 
    def private icon_clicked ()
        print("I know you have clicked on the icon !!")
 
def private about_clicked ()
        var about = new AboutDialog ()
        about.set_version("1.0")
        about.set_program_name("Simple StatusIcon Test")
        about.set_comments("This is a Simple StatusIcon Test")
        about.set_copyright("Nicolas alias nikobordx")
        about.run()
        about.hide()
 
    def private exit_app ()
        Gtk.main_quit();


Compile with:
valac -C --pkg gtk+-2.0 genietray.gs
gcc -Os `pkg-config --cflags --libs gtk+-2.0` -o genietray genietray.c -s
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technosaurus


Joined: 18 May 2008
Posts: 3843
PostPosted: Mon 07 Jun 2010, 02:03    Post subject: Multi-call binaries in Vala
Subject description: have multiple programs in one binary (a la busybox)		  
Multi-call binaries in Vala (like in busybox)

Here is a very basic example using the symlink method:
(just make a symlink called hello and another called goodbye)
Code:
class Demo.HelloWorld : GLib.Object
{
   public static int main(string[] args)
   {
      if ("hello" in args[0]){stdout.printf("Hello World!\n");}
      if ("goodbye" in args[0]){stdout.printf("Good-Bye World!\n");}
      return 0;
    }
}


Notes:
to get the alternate behavior such as in busybox <command> use args[1] instead ... for a larger number of commands a "case" would be better than a bunch of "if"s

The number of libraries available to vala is growing - with something like this it becomes possible to create an entire desktop in a single binary, thus saving significant code size.
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technosaurus


Joined: 18 May 2008
Posts: 3843
PostPosted: Tue 08 Jun 2010, 01:27    Post subject:  
Vala-0.9.1 was released today - it breaks compatibility with most of the plugin examples I have seen including Valide, so I un-patched that part.

http://git.gnome.org/browse/vala/commit/?id=5fd7b8cebb983fccdebcd9329671d94c1e5cf826

I built Valide-0.7.0 against that and it works great so far - unfortunately I had to also add gdl and upgrade gtk>2.18, glib>2.22, and gtksourceview(I just went ahead and compiled the latest... still no genie support though) ... gtk and glib upgrades are available from the ibiblio repo

gdl_DEV-2.30.0-i486.pet
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vala-0.9.1-i486.pet
Description  Note: This is not the official 0.9.1 because I removed plugin code that generates a compile error.
Use the link above to fix your plugin code prior to the 1.0 release.
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growler


Joined: 24 Mar 2008
Posts: 209
Location: Kapiti - New Zealand
PostPosted: Sat 28 Aug 2010, 03:43    Post subject: Genie and Sqlite  
Having a go with my first forays into Genie programming.... appreciated all the examples in this thread.

I am trying to understand how to use the sqlite bindings and as an exercise I tried to convert an example in Vala to get the code below:

Code:
[indent=4]
uses Sqlite
 
class SqliteSample : Object
 
    def callback (n_columns: int, values : array of string, column_names : array of string ) : int
        for i:int = 0 to n_columns
            print ("%s = %s\n", column_names[i], values[i]);

        print ("\n");
        return 0;

    def main (args : array of string): int
        var db = new Database
        rc :int
        if args.length != 2
            print ("Usage: %s DATABASE SQL-STATEMENT\n", args[0])
            return 1

        if !FileUtils.test (args[1], FileTest.IS_REGULAR)
            print ("Database %s does not exist or is directory\n", args[1])
            return 1
      
        rc = Database.open (args[1], out db)
      
        if rc != Sqlite.OK
            print ("Can't open database: %d, %s\n", rc, db.errmsg ())
            return 1
 
        rc = db.exec (args[2], callback, null)
        if rc != Sqlite.OK
            print ("SQL error: %d, %s\n", rc, db.errmsg ())
            return 1
   
        return 0

init
    var SQLLiteTest = new SqliteSample
    params: array of string = {"/root/my-applications/PointOfSale.sqlite", "SELECT * FROM currencies"}
    SQLLiteTest.main(params)



I get:
Code:
# valac --pkg sqlite3 sqlite.gs
sqlite.gs:39.5-39.10: error: syntax error, expected identifier
    params: array of string = {"/root/my-applications/PointOfSale.sqlite", "SELECT * FROM currencies"}
    ^^^^^^
Compilation failed: 1 error(s), 0 warning(s)



Appreciate any pointers.
Last edited by growler on Sat 28 Aug 2010, 04:25; edited 3 times in total
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growler


Joined: 24 Mar 2008
Posts: 209
Location: Kapiti - New Zealand
PostPosted: Sat 28 Aug 2010, 03:58    Post subject: XML-RPC with libSOUP  
I am trying to get data from another application (webERP) over XML-RPC and started to play with libsoup - again there is a vala example which I have tried to hack into Genie but coming unstuck.

I can get the following to compile:
Code:

indent=4]
/* Build with "valac --thread --pkg libsoup-2.4 yourfile.gs */
uses
    Soup
   
init
    var session = new Soup.SessionAsync ()
    ItemCode:string = "DVD-TOPGUN"
    UserName:string = "admin"
    Password:string = "weberp"
   
    var message = Soup.xmlrpc_request_new ("http://localhost/webERP/api/api_xml-rpc.php", "weberp.xmlrpc_GetStockBalance", typeof(string),ItemCode, typeof(string), UserName, typeof(string), Password)
   
    session.send_message(message)
   
    ResponseData:string = message.response_body.flatten().data
   
    ErrorNumber:int = typeof(int)
    try   
        xmlrpc_parse_method_response (ResponseData, -1, ErrorNumber)
        print("Stock of %s = %s",ItemCode, ResponseData)
        print("Error number %d", ErrorNumber)
    except
        print("Could not get webERP API location stock over XML-RPC")

    /*Is this how to create an associative array

    struct LocQty
          quantity : double
          loccode : string

    var StockQuantities = new array of LocQty
    ErrorMessage:string
    xmlrpc_extract_method_response(ResponseData, -1, ErrorMessage, typeof(array of dict of string, double), StockQuantities)
   */


However, I can't get the last bit to xmlrpc_extract_method_response call to work - I think this is supposed to parse the response XML to nice variables. I think the 3rd parameter is supposed to be the data type of the return variables - which is an array of structs - the program as compiled returns:

Code:
# ./SoupXMLRPC
Stock of DVD-TOPGUN = <?xml version="1.0"?>
<methodResponse>
<params>
<param>
<value><array>
<data>
<value><int>0</int></value>
<value><array>
<data>
<value><struct>
<member><name>quantity</name>
<value><string>-1</string></value>
</member>
<member><name>loccode</name>
<value><string>MEL</string></value>
</member>
</struct></value>
<value><struct>
<member><name>quantity</name>
<value><string>0</string></value>
</member>
<member><name>loccode</name>
<value><string>TOR</string></value>
</member>
</struct></value>
</data>
</array></value>
</data>
</array></value>
</param>
</params>
</methodResponse>
Error number 24



So it works with a good XML message returned.

Do I then have to parse the XML using xml as per Caleb's jwmconf example or does that method xmlrpc_extract_method_response do the trick....

This is very steep learning for me, I am in WAY over my head here!

Hope someone has done this before and can point me in the right direction
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nikobordx

Joined: 23 May 2009
Posts: 84
Location: Bordeaux, France
PostPosted: Sat 28 Aug 2010, 05:59    Post subject: Genie and Sqlite  
Hi growler,

Can you try this:

Code:

[indent=4]

uses
    Sqlite
 
class SqliteSample : Object

    db : Sqlite.Database
 
    def callback (n_columns: int, values : array of string, column_names : array of string ) : int
        for i:int = 0 to n_columns
            print ("%s = %s\n", column_names[i], values[i])

        print ("\n");
        return 0;

    def begin (args : array of string) : int
        rc : int
        if args.length != 2
            print ("Usage: %s DATABASE SQL-STATEMENT\n", args[0])
            return 1

        if !FileUtils.test (args[0], FileTest.IS_REGULAR)
            print ("Database %s does not exist or is directory\n", args[0])
            return 1
     
        rc = Database.open (args[0], out db)
     
        if rc != Sqlite.OK
            print ("Can't open database: %d, %s\n", rc, db.errmsg ())
            return 1
 
        rc = db.exec (args[1], callback, null)
        if rc != Sqlite.OK
            print ("SQL error: %d, %s\n", rc, db.errmsg ())
            return 1
   
        return 0

init
    var SQLLiteTest = new SqliteSample
    test : array of string = {"/root/my-applications/PointOfSale.sqlite", "SELECT * FROM currencies"}
    SQLLiteTest.begin(test)


Do not use "def main" in fonction, and "params" for arrays of string.

Nicolas.
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growler


Joined: 24 Mar 2008
Posts: 209
Location: Kapiti - New Zealand
PostPosted: Sat 28 Aug 2010, 06:53    Post subject: Genie and Sqlite  
Not sure what the first parameter was meant to be I made the parameters array to have a blank element since the DB file was the second element and the SQL the third. et voila ...

Code:
test : array of string = {"", "/root/my-applications/PointOfSale.sqlite", "SELECT * FROM currencies"}


Merci beaucoup Nicolas!!
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Mobeus


Joined: 26 Aug 2010
Posts: 93
PostPosted: Mon 30 Aug 2010, 22:11    Post subject:  
With Vala I can't find a means to explicitly close a file opened with FileStream.open. Is there not a wrapper for fclose()? How is it done?

tia
Mobeus
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nikobordx

Joined: 23 May 2009
Posts: 84
Location: Bordeaux, France
PostPosted: Tue 31 Aug 2010, 05:31    Post subject:  
Hi everyone,

growler:
Why not using
Code:
test : array of string = {"/root/my-applications/PointOfSale.sqlite", "SELECT * FROM currencies"}

and change number of your "args" ?

Mobeus:
You don't need to specify to close the file because it is automatically closed!
In GLib's vapi file you can see on the class "FileStream":
Code:
[CCode (cname = "FILE", free_function = "fclose", cheader_filename = "stdio.h")]


See you,
Nicolas.
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growler


Joined: 24 Mar 2008
Posts: 209
Location: Kapiti - New Zealand
PostPosted: Tue 31 Aug 2010, 05:33    Post subject:  
Yes your solution is better.

Have you ever used libsoup - I can't get to grips with the

xmlrpc_extract_method_response method. I find the documentation very cryptic and spartan!!
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nikobordx

Joined: 23 May 2009
Posts: 84
Location: Bordeaux, France
PostPosted: Tue 31 Aug 2010, 06:16    Post subject:  
I made only 2 small samples with libsoup:
http://code.valaide.org/content/genie-libsoup-simple-sample
http://code.valaide.org/content/genie-libsoup-simple-server

I can help you if you post your code (if your code is not top secret ! Very Happy )

Nicolas.
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