find command

ex:

find  .   -name  "test.c"

first argument set the path to find

second argument set the file to find

build java project from eclipse in xcode

prepare:

change Java template in Xcode

edit  /Developer/Library/Xcode/Project Templates/Java/Java Applicationex/build.xml

       source="1.5"  target="1.5"

(1)check out project "Test" from cvs

(2)create the Java project named "Test"

(3)now xcode create build.xml to compile your Java project 

include external jars

place jars in   Test/lib/

set main function:

in Info.plist,  set value = packageName.className  for key = MainClass

in Manifest,  set  Main-Class: packageName.MainClass

set image files:

place them in Test/bin

set VMOptions

in info.plist,  set  "-Xmx512m"  for key  "VMOptions"

set class path for app:

In Info.plist, set the value of  ClassPath

ex:

<key>ClassPath</key>

<array>

<string>$JAVAROOT/test1.jar</string>

<string>$JAVAROOT/test2.jar</string>

</array>

not including other jars when creating jar

comment  zipgroupfileset refid="lib.jars"

when the resource is the same location as execution file, how to set resource:

1. if execution file is jar(in jars/) , put resource in jars/ and use "java -jar" to run program

2. if execution file is App(in dist/), put resource in dist/  and run from xcode

3. place them in the bin/packageName/  

define macro in xcode

ex:

configuration: Debug

gcc 4.0 processing-> preprocessor macros:   _DEBUG

memory management in objective-c

retain:

increase retain count

release:

decrease retain count

array:

when an object is added to the array, the object's retain count is increased

when the array is deallocated,  the object( in array) 's retain count is decreased 

dealloc:

when an object's retain count becomes 0, its dealloc method is called

autorelease:

the object is added to autorelease pool when it is sent message autorelease

when the pool is drained, it sends message release to all objects in the pool

objects created by alloc, new, copy or mutableCopy have a retain count of 1 & are not in the autorelease pool 

if the object is get from other method, it is usually in the autorelease pool. If you do not want it to be deallocated when the pool drain, you must retain it

memory control for setter:

retain , then release

ex:

-(void)setName:(NSString*)name

{

      [name retain];

      [myName release];

      myName= name;

}

create root account

sudo passwd root

fileMerge

the GUI software to compare two files

compare two files

the two files compared are on the two top windows

use action to create merged file

the merged file is on the bottom window

(1) do action

(2) save file

diff

-w: ignore all whitespace

-q: Output only whether files differ