Archive for the ‘C++’ Category

DIY Webserver Using PureMVC++

Tuesday, December 22nd, 2009

To test out my newly ported PureMVC++ implementation I decided to write an example webserver. I’ve always wanted to write one, and I didn’t realize just how easy it is (to make a VERY rudimentary version).

The server parses your http request and then spits it back out at you, with some nice html.
Screen shot 2009-12-22 at 2.35.47 PM
That’s it! Source code is here:
http://github.com/schell/PureMVC-Plus-Plus/tree/master/example/httpserver/

PureMVC++ – A C++ MVC framework (ported from AS3)

Friday, December 18th, 2009

I had some time over the past month to port the popular PureMVC application architecture from AS3, to C++. I learned a ton about C++ and it turned out to be a rather smooth process. The code is up on github.

Differences in the C++ version

Notification names and types are ints!
At first I used strings for notification names and types, just like in other ports. I did this until I was writing the first sample application. At that moment I realize in C++ you can’t switch on strings! There’s no support for writing a switch statement on the type std::string. I simply didn’t know that. So code like this just won’t compile:

switch ("somestring")
{
    case "notthisone":
        trace("not gonna happen");
        break;
       
    case "northisone":
        trace("also not gonna happen");
       
    case "somestring":
        trace("this one gets evaluated");
        break;
       
    default:
}

C++ only allows you to switch on ints, so to save us from having to write something like this:

if(note->getName() == "notthisstring")
    cout << "not gonna happen";
else if(note->getName() == "northisstring")
    cout << "also not going to happen";
else if...

I decided to make note names and types ints. This way we can enumerate our notification names and types like so:

class n_name
{
public:
    enum name
    {
        NIL,
        STARTUP,                // triggers the app startup sequence
        SET,                    // sets something
        GET,                    // makes a request to get something
        DISPLAY,                // display something
        QUIT                    // quit the app
    };
}

and then handle the notification with ints:

int name = note->getName();
switch(name)
{
    case n_name::STARTUP:
        cout << "Startup the app!";
        break;
    case n_name::QUIT:
        cout << "Shutdown...";
        break;
    default:
}

IFacade no longer contains a registerCommand method
I tried my best to figure out a way to implement stateless commands in C++. The way the AS3 version accomplishes this is by passing around references to classes. In that port handling references to classes in an abstract way is easy because AS3 has built in type introspection. In order to do the same thing in C++ we’d have to depend on something from the boost library. That’s not an option. Instead I gave Facade a templated method to replace IFacade’s registerCommand (conveniently called registerCommand). So instead of calling registerCommand(noteName, CommandClassName), one makes a call like this: registerCommand<CommandClassName>(noteName). This calls a special template function created by the compiler that adds CommandClassName to a templated Observer, which is added to the View’s observer list.

That covers it for now. In the coming weeks I’ll probably be adding example code to this post, as well as example applications to the repo. If you’re interested in the project, keep up to date with the repo at github and soon we’ll have a repo at PureMVC.org. I’ve added some temporary documentation for you to use as well.

I updated my gcc formatting php script.

Tuesday, March 24th, 2009

A while ago I wrote a script that formats gcc output to link errors back into TM. I updated that script with support for warnings and added some cool looking construction theme colors for the errors and warnings. Have a look see.

Formatting gcc and g++ output for TextMate.

Formatting gcc, g++ Output Using PHP In TextMate

Saturday, September 20th, 2008

While at ZendCon08 I saw a lot of people sharing the same love for TextMate as myself. I fricken love TextMate. Some of my friends laughed at me, saying “Bah, TM’s not an IDE, why do you want to write shell scripts to try to make it one?” And I’d be like, “I’m an ActionScript developer, there’s no point in using a sledge hammer to pound in nails.” This makes sense because my friends use Eclipse. I tried Eclipse but it’s so huge and the plugins are huge and the interface is cluttered and theming syntax-coloring is a pain. So when I got home from ZendCon, with my renewed love for PHP, and my continual quest to eventually be a good C programmer, I decided to write a gcc parser script that linked back into TextMate to go directly to my errors. I use a dark syntax theme, a slightly modded Amy, and the parser reflects that. Check out a picture of these gcc errors:

Picture of colored gcc output.

Picture of colored gcc output.


To do this you’ll need PHP installed on your machine. After that, the first step is to create a new command in TextMate’s C Bundle. Call it “Build, Format With PHP,” or anything else. Set it to save all files in the project when run [from the pull down at the top] now enter this into the text area:

export FILE=`basename ${TM_FILEPATH}`
export DIR=${TM_PROJECT_DIRECTORY}
~/Library/Application\ Support/TextMate/Support/bin/make_format_gcc.sh

Next select Output as “Show as HTML” so we can see our output. Now create a file called “make_format_gcc.sh” in the folder ~/Library/Application Support/TextMate/Support/bin/
Once you’ve created the file, use TM or vim to fill it with this:

make &> ${FILE}.mkout
php -f ~/Library/Application\ Support/TextMate/Support/bin/gcc_format.php ${FILE} ${DIR}

This bash script executes the make on the makefile and directs the standard and error output to the same file. Then the script calls php to parse and display the file. So now create a file named “gcc_format.php” in the same folder as make_format_gcc.sh and fill it with the meat of our parser:

<?php

    // get stdout and stderr then delete temp file
    $dir = $argv[2];
    $commandFile = $argv[1] . '.mkout';
    $commands = file_get_contents($commandFile);
   
    // break lines up by line ending
    $lines = explode("\n", $commands);
   
    // find errors and link them to pages and line number
    $errors = 0;
    for ($i=0; $i < count($lines); $i++)
    {
        $fnpos = strpos($lines[$i], ':');
        $filename = substr($lines[$i], 0, $fnpos);
        $lnpos = strpos($lines[$i], ': error:');
        $linestart = $lnpos - $fnpos - 1;
        if($linestart < 0) continue;
        $line = substr($lines[$i], $fnpos+1, $lnpos - $fnpos - 1);
        $link = "txmt://open/?url=file://$dir/$filename&line=$line&column=1";
        $lines[$i] = substr_replace( $lines[$i], '</a>', $lnpos, 0);
        $lines[$i] = "<a href=\"$link\">" . $lines[$i];
        $errors++;
    }
    $output = implode("<br />\n", $lines);
   
    echo '
    <html>
    <head>
        <style type="text/css">
        body    {background:#000000; color:#999999;}
        #comment{width:100%; background: #230021; color:#6060BF;}
        #fail   {width:100%; background:#3E0018; color:#9918B8;}
        #succ   {width:100%; background:#230021; color:#B0FFF0;}
        dslsh   {color:#A96AA9;}
        a:link  {color:#008080;}
        a:hover {color:#80A0FF;}
        </style>
    </head>
        <body>
            <div id="comment">
                <dslsh>//</dslsh> '
. $argv[1] .'\'s build results:
            </div>'
;
           
    echo $output . '<br />';
    if($errors > 0)
    {
        echo '<div id="fail">Build failed with '. $errors .' errors.</div>';
    }else
    {
        echo '<div id="succ">Build Succeeded!</div>';
    }
    echo'
        </body>
    </html>'
;
?>

This example assumes that you are working in a directory with a makefile, but I’m sure it can be easily modded to work with any build script. The colors reflect my favorite theme, but they should also be easily modded with lines 32-38 of the php script. Happy coding, peoples!

Quake for Flash (C/C++ to AS3)

Tuesday, November 27th, 2007

Scott Peterson has created a tool for porting C/C++ code to AS3. What the shit. That rocks. This demo was shown at the 2007 Adobe MAX conference, in the sneak peeks section, so keep in mind it may never see the light of day. But how cool is this? Adobe better jump on this.


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