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Hello all. I created the program at the bottom as a test as I was having problems with Aggregation Assocation in my assignment. The program below has the person class that we created in the last post but now it also has a new link class with two functions. The first function sets the pointer to the person, the second increases the person’s age by one. You can see that I have commented out the orginal command that sets the person’s age.

A pointer is a link to the RAM address of something else, in this case a instance of the person class. You access a pointer’s public functions / variables by the -> symbol. So pointer->setValue(newValue) would run the setValue function of what the pointer is connected too.

A Aggregation Assocation is a connection between two classes that do not own one another. For example a pet belongs to it’s owner but a student does not belong to a school as student and school are both independant entities that are connected.

This is something I did quickly and thought I’d stick online so if you have any questions leave a comment and I’ll get back to you.

#include <iostream>
#include <string>

using namespace std;

class person
{
  private:
    int age;
    string name;

  public:
    // Constructors
    person();
    person(string newName, int newAge);

    // Accessors
    string getName() { return name; };
    int getAge() { return age; };
    // datatype getVariable() { return variable; };

    // Mutators
    void setName(string newName);
    void setAge(int newAge);
    // void setVariable(datatype newVariable);

};

person::person()
{
  name = "Stranger";
  age = 100;
}

person::person(string newName, int newAge)
{
  name = newName;
  age = newAge;
}

void person::setName(string newName)
{
  name = newName;
}

void person::setAge(int newAge)
{
  age = newAge;
}

///////////////////////////////////////////////////
class pointerClass
{
  private:
    person *link; // pointer to a person

  public:
    void setLink(person * newLink); // set the pointer to a person you've created
    void incAge(); // increase their age by one

};

// set the pointer to a person you've created
void pointerClass::setLink(person * newLink)
{
  link = newLink;
}

// Increse their age by one.
void pointerClass::incAge()
{
  int temp = link->getAge(); //get Age
  // cout << "temp: " << temp << endl; // output orginal age
  link->setAge(++temp); // inc and set new age.
  // cout << "temp: " << temp << endl; // output new age
}

///////////////////////////////////////////////////
int main()
{
  pointerClass myLink;
  person steve("Steve", 20);
  myLink.setLink(&steve);
  cout << steve.getAge() << endl;
  // steve.setAge(21);
  myLink.incAge();
  cout << steve.getAge() << endl;
}

Last time we showed you how to install Apache 2.2 on OS X Tiger. This time we will show you how to add user directory support to it.

Assuming you installed Apache to /usr/local/apache2 then you need to look at a file called httpd-userdir.conf in /usr/local/apache2/conf/extra. This is the file that tells Apache where there user’s directory is and what directory inside it is the public_html one. Open this file up in a text editor of your choice. There are only two lines you need to edit.

UserDir public_html
<Directory "/home/*/public_html">

This is the default config for Apache but this is designed for linux systems. To make this work on OS X you need to change these lines to the below.

UserDir Sites
<Directory "/Users/*/Sites">

You will notice that public_html has been changed to Sites. If you look in your home directory this folder will be here. We also changed /home to /Users because this is what OS X uses for the user’s directories.

The last thing you need to do is to enable the user directory support in the main httpd.conf file. It will be in /usr/local/apache2/conf. Look for the below line and simply remove the # (hash) symbol from the beginning.

#Include conf/extra/httpd-userdir.conf

Now just save the file and go into system preferences, select sharing then stop and start “Personal Web Sharing”. Now enjoy your user directory support for Apache 2.2 in OS X Tiger.

All comments and questions are welcome. I’m always looking to improve my writing.

User directory suppport on OS X

Hey all. Mac users will know that a lot of new apples come with both i383 and ppc executable. If you’d like to save space you can strip one of them from the program. Here is how I did it to Safari 3.1:

First you open up Terminal.app under Utilities in the Applications directory.

Last login: Sun Mar 23 22:04:19 on ttyp1
Welcome to Darwin!
$ cd /Applications/Safari.app/Contents/MacOS/
$ ls
Safari
$ file Safari
Safari: Mach-O universal binary with 2 architectures
Safari (for architecture i386): Mach-O executable i386
Safari (for architecture ppc): Mach-O executable ppc
$ lipo -remove i386 Safari -output Safari
$ file Safari
Safari: Mach-O universal binary with 1 architecture
Safari (for architecture ppc): Mach-O executable ppc

For Intel users:
$ lipo -remove ppc Safari -output Safari

Explained:
The first two commands move you into the Safari.app binary and show you the contents of the folder. The file command shows you that the binary is a fat binary, IE it contains two arches.

Now lipo is the key to all of this. This is a command line tool that creates or operates on a universal files.

The binary you want to edit is located in Contents/MacOS inside the .app file. It is normally the only file in there.

Notes:
Backup the .app file before you begin just incase you make a mistake.
In firefox it’s called firefox-bin.
Tab-complete is your friend Continue reading ‘Mac binary stripping guide’