FLYing's Computer Information

2012年5月17日星期四

Ubuntu 安裝 JAVA6

安裝Java
關閉所有視窗，同時按下Ctrl + Alt + T 打開終端畫面，
接著安裝JDK，下列的方式是安裝1.6.x版本。

Installing the JDK
下載 jdk-6uXX-linux-x64.bin
$ sudo apt-get purge openjdk*
$ chmod +x jdk-6u32-linux-x64.bin <--將bin檔設定可執行
$ ./jdk-6u32-linux-x64.bin
$ sudo mv jdk1.6.0_32 /usr/lib/jvm/
Install new java source in system:
$ sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.6.0_32/bin/javac 1
$ sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.6.0_32/bin/java 1
Choose default java:
$ sudo update-alternatives --config javac <--設定預設Javac
There are 2 choices for the alternative javac (providing /usr/bin/javac).

Selection Path Priority Status
------------------------------------------------------------
* 0 /usr/lib/jvm/java-7-oracle/bin/javac 1 auto mode
1 /usr/lib/jvm/java-7-oracle/bin/javac 1 manual mode
2 /usr/lib/jvm/jdk1.6.0_32/bin/javac 1 manual mode

Press enter to keep the current choice[*], or type selection number: 2
update-alternatives: using /usr/lib/jvm/jdk1.6.0_32/bin/javac to provide /usr/bin/javac (javac) in manual mode.

$ sudo update-alternatives --config java <--設定預設Java
There are 2 choices for the alternative java (providing /usr/bin/java).

Selection Path Priority Status
------------------------------------------------------------
* 0 /usr/lib/jvm/java-7-oracle/bin/java 1 auto mode
1 /usr/lib/jvm/java-7-oracle/bin/java 1 manual mode
2 /usr/lib/jvm/jdk1.6.0_32/bin/java 1 manual mode

Press enter to keep the current choice[*], or type selection number: 2
update-alternatives: using /usr/lib/jvm/jdk1.6.0_32/bin/java to provide /usr/bin/java (java) in manual mode.

安裝完成後執行java -version指令看到如下訊息出現表示安裝完成。
$ java -version
java version "1.6.0_32"
Java(TM) SE Runtime Environment (build 1.6.0_32-b05)
Java HotSpot(TM) 64-Bit Server VM (build 20.7-b02, mixed mode)

參考:http://cheng-min-i-taiwan.blogspot.com/2012/05/ubuntu-1204-lts-android-sdk.html

Auto mount partitions using Storage Device Manager (pysdm)

sudo apt-get install pysdm

sudo pysdm

select the partition you want to be automatically mounded on startup and click the "Assistant" button.

- check the box next to "The file system is mounted at boot time" (it's probably already be checked),

- make sure the "Mount file system in read-only mode" is unchecked (this is automatically checked for NTFS partitions),

- check the "Allow any user to mount the file system" box,

- check the "Allow a user to mount and unmount the filesystem" box,

Once you're done, click OK and "Apply" (important - if you don't click the "Apply" button on the Storage Device Manager window, the settings won't be applied). Follow the same steps for each partition (be it NTFS, EXT3/4, etc.) and click "Apply" when done.

If you've messed up something, you can restore the original fstab file which we've backed up above, using this command:

sudo cp /etc/fstab.old /etc/fstab
參考:http://www.webupd8.org/2011/11/how-to-mount-partitions-automatically.html

2012年5月11日星期五

about broadcast(C#)

接收:
Socket sock = new Socket(AddressFamily.InterNetwork,SocketType.Dgram, ProtocolType.Udp);
sock.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, 100);
sock.EnableBroadcast = true;
sock.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, true);
sock.ReceiveTimeout = 1000;
IPEndPoint iep = new IPEndPoint(IPAddress.Any/*IPAddress.Parse("192.168.1.220")*/, 8027);
sock.Bind(iep);

EndPoint ep = (EndPoint)iep;
Console.WriteLine("Ready to receive..." + sock.LocalEndPoint.ToString());

while (runTD)
{
Console.WriteLine("Waiting for data..");

try
{
byte[] data = new byte[1024];
int recv = sock.ReceiveFrom(data, ref ep);
//int recv = sock.Receive(data);
string stringData = Encoding.ASCII.GetString(data, 0, recv);
//dosomething
Console.WriteLine(stringData.Trim());
}
catch
{
Console.WriteLine("timeout!!");
}
}
sock.Close();

發送:
Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
sock.EnableBroadcast = true;
sock.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, true);

IPEndPoint iep1 = new IPEndPoint(IPAddress.Broadcast, 8028);

string str = tb_send.Text.ToString();
byte[] data = Encoding.ASCII.GetBytes(str);

sock.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, 100);
sock.SendTo(data, iep1);

sock.Close();

注意:若收不到請檢察防火牆。

demo download : https://docs.google.com/open?id=0B2Mp2cW7CWo5bEo5NWp4WGNSZ1U

2012年5月10日星期四

JSON in JAVA

JSON(JavaScript Object Notation)
json jar download : https://docs.google.com/open?id=0B2Mp2cW7CWo5V183dUpsLUVIQUU
json api doc : http://www.json.org/java/index.html
參考資料 :
http://werdna1222coldcodes.blogspot.com/2009/01/json-in-java.html

about broadcast (java、android)

（廣播） broadcast 和群播（ multicast ）兩者皆基於UDP的協議。

廣播(broadcast)
Code寫法與單播一樣，區別在於目的地址不同。單播使用的是特定ip地址，而廣播顧名思義就是要向其他的客戶端發送消息，所以使用的是255.255.255.255(ipv4)。
JAVA:
public static final String broadip = "255.255.255.255";
public static final int broadport = 8027;
DatagramSocket socket= new DatagramSocket( broadport );
address = InetAddress.getByName(broadip);
socket.setBroadcast(true);
socket Saddress = new InetSocketAddress(broadip, broadport);
socket .bind(Saddress);//接收時需要bind

byte[] SendBuf = InMsg.getBytes();//String InMsg為要傳送的字串
int length = InMsg.getBytes().length;
packet = new DatagramPacket(SendBuf, length,address,broadport);
socket .send(packet);

群播(multicast)
稍微則稍微複雜一點。 Java提供了一個MulticastSocket的類來進行multicast,該類繼承於DatagramSocket。
多播地址一般為224.0.0.0 - 239.255.255.255(ipv4)。
JAVA:
InetAddress address = InetAddress.getByName("224.0.0.0");
if (!address.isMulticastAddress()) {
throw new Exception("this is not multi address");
}
packet = new DatagramPacket(byteToSend, byteToSend.length,address, 9999);
與廣播不同，它使用的是一個群播組。接收方需要加入這個組以告知對該組上的數據有興趣。所以接收方有一個joinGroup的操作，
JAVA:
MulticastSocket socket = new MulticastSocket();
socket.joinGroup(address);

demo download : https://docs.google.com/open?id=0B2Mp2cW7CWo5am9HSlozanZVc1k

Output To Console In Windows Forms Application

using System.Runtime.InteropServices;

public class Win32

{ ///

/// Allocates a new console for current process. ///

[DllImport("kernel32.dll")]

public static extern Boolean AllocConsole(); ///

/// Frees the console. ///

[DllImport("kernel32.dll")]

public static extern Boolean FreeConsole();

}

public Form1()

{

InitializeComponent();

Win32.AllocConsole();

}

在需要的地方插入下Code:

Console.WriteLine("Waiting for data..");

參考:http://www.thereforesystems.com/output-to-console-in-windows-forms-application/

2010年9月3日星期五

GPhone 1 升級經驗 - Android 2.2 - 使用CyanogenMod-6 ROM

測試環境 :
手機 : google developer phone 1

Android Developer Phone 1

原本的Android版本 :1.6 (HTC官方) http://developer.htc.com/adp.html

預先準備工作 :

獲取Root權限

Universal Androot

使用Universal Androot
下載適合自己Radio 本文採用
http://sapphire-port-dream.googlecode.com/files/ota-radio-2_22_19_26I.zip
安裝Clockwork Recovery
在Android Market上搜索安裝ROM Manager程序(下方有QR code 使用 Barcode Scanner 掃描前往下載)，通過ROM Manager程序安裝Clockwork Recovery（在ROM Manager程序裡點擊’Install ROM from SD Car’會自動提醒你下載安裝Clockwork Recovery）
下載Danger SPL
http://sapphire-port-dream.googlecode.com/files/spl-signed.zip
安裝DangerSPL前必須先檢查手機目前是否已經運行正確的版本，關閉手機同時按電源鍵和照相鍵進入fastboot模式，第二行是SPL的版本，如果結尾是2005（比如我的版本是 ‘HBOOT-1.33.2005(dream0000)‘），那麼恭喜你已經正確安裝SPL可以直接跳過這一步
通過Nandroid backup備份你的系統設置和程序
參考http://blog.roodo.com/DavidLanz/archives/13311927.html
(需先安裝ROM Manager)
下載CyanogenMod-6 ROM http://mirror.kanged.net/cm/stable/update-cm-6.0.0-DS-signed.zip
下載Google Addon http://mirror.kanged.net/gapps/gapps-mdpi-tiny-20100816-signed.zip

ROM Manager

升級工作 :

將下載好的DangerSPL文件和Radio文件放到SD卡根目錄，使用ROM Manager程序選擇Reboot into Recovery進入ClockworkMod Recovery模式，選擇install zip from sdcard,選擇Radio文件安裝，完成安裝後重啟到這個界面，同樣的方法安裝DangerSPL文件，安裝後也會重啟到ClockworkMod Recovery模式，到這裡你已經完成了最危險的DangerSPL操作，進入安裝ROM環節
使用ROM Manager程序選擇Reboot into Recovery進入ClockworkMod Recovery模式，選擇wipe(兩個都要)，此步驟會清除所以資料，記得先備份資料，完成安裝後重啟到這個界面。
按照同樣的辦法安裝CyanogenMod-6 ROM文件，安裝完成後就可以重啟手機進入系統，欣賞一下超酷的啟動動畫後就可以進入系統享受完美的 Android 2.2系統。
你會發現新系統沒有Google內置的程序，別擔心，再按照上面的辦法安裝Google Addon文件重啟手機後熟悉的程序又都回來了。