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    <p><a href="http://iphonedevwiki.net/index.php/Theos/Getting_Started" rel="nofollow">By far, the easiest way to develop MS tweaks is to use Theos</a></p> <p>Follow the instructions given on the link above to install theos, navigate to the folder you want to store the project in and run <code>$THEOS/bin/nic.pl</code> to generate a template for your tweak. </p> <p>The generated Tweak.xm file is where you put your code. To build the project just navigate to the project directory in Terminal and run <code>make</code>. If have <code>dpkg</code> on your system, then you can package up and install the project easily. Make sure <code>OpenSSH</code> is installed on your iDevice and add this line to your project's makefile:</p> <pre><code>THEOS_DEVICE_IP = [INSERTDEVICESIPHERE] </code></pre> <p>Then run <code>make package install</code> to build your project, package it in a .deb, transfer it over to your device and install it.</p> <p>The code that actually goes in the Tweak.xm file is objective-C with a language that simplifies Mobile Substrate tasks called Logos, which is explained here: <a href="http://iphonedevwiki.net/index.php/Logos" rel="nofollow">http://iphonedevwiki.net/index.php/Logos</a>. Generally though, the code follows this format:</p> <pre><code>%hook classname //declares the class from your application you're going to override -(void)functionyouwanttooveride { dosomethingnew(); //put all your new code for the method here return %orig; //this calls the original definition of the method and returns the result } %end //end hooking classname </code></pre> <p>To find out what classes and methods you need to override to do whatever you want to do, install <code>class-dump</code> from cydia, ssh into your device and run <code>class-dump -H path/to/your/binary -o /path/where/you/want/your/classheaders</code>. Then you just have to look through the resulting headers to find classes and methods that have names that seem relevant to what you're doing, and experiment with them.</p> <p>Good luck!</p>
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    1. COThank you dude! But how can i find out any `functionyouwanttooverride` ? How can I get the original code for the function, so that i can modify it?
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    2. CONo worries! That's the tough bit, you don't have the source code so you can't ever see the implementation of any of the functions, so it takes a lot of guesswork. If you install the "syslogd to /var/log/syslog" package from cydia then if you can use `%log` in your code and it will write to the syslog (located at /var/log/syslog) that the method had been called, and record what arguments it was called with to give you a better idea of what's going on. Also install gdb from cydia and you can set breakpoints on interesting methods to find out what's happening. It's tough, just keep experimenting!
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    3. COAlso note though, once writing to syslog is enabled, lots of other processes will also write to it and it fills up fairly quick and might eat up a bit of space, so you may want to delete it every now and then or disable logging when you don't need it, you can see more about that at [theiphonewiki](http://theiphonewiki.com/wiki/index.php?title=System_Log)
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