Free X11 server for Windows












Linux: block outgoing traffic to specific ip or port using iptables or ufw








  • Using iptables:
    • # block outgoing traffic to ip 1.2.3.4
      iptables -A OUTPUT -d 1.2.3.4 -j DROP
      
      # block outgoing traffic to port 5678
      iptables -A OUTPUT -p tcp –dport 5678 -j DROP
      
      # block outgoing traffic to 1.2.3.4:5678
      iptables -A OUTPUT -p tcp -d 1.2.3.4 –dport 5678 -j DROP
      
  • Using ufw:
    • 
      # block outgoing traffic to ip 1.2.3.4
      ufw deny out to 1.2.3.4
       
      # block outgoing traffic to port 5678
      ufw deny out to any port 5678
      
      # block outgoing traffic to 1.2.3.4:5678
      ufw deny out to 1.2.3.4 port 5678
      

see also: Linux Iptables Block Outgoing Access To Selected or Specific IP Address / Port



Linux firewall: ufw








  1. Installation(on Ubuntu):
    • sudo apt-get install ufw
  2. Configuration script:
    • #!/bin/sh
      # disable and reset ufw
      sudo ufw reset --force
      
      # deny everything
      sudo ufw default deny
      
      # allow remote ssh connection from host 1.2.3.4
      sudo ufw allow proto tcp from 1.2.3.4 to any port 22
      
      # allow remote ssh connection from host 1.2.3.5
      sudo ufw allow proto tcp from 1.2.3.5 to any port 22
      
      # trust remote ip 1.2.3.6
      sudo ufw allow from 1.2.3.6
      sudo ufw allow to 1.2.3.6
      
      # allow https server port
      sudo ufw allow proto tcp from any to any port 443 
      
      # allow tcp connection from 1.2.3.7 to port 6666
      sudo ufw allow proto tcp from 1.2.3.7 to any port 6666
      
      # enable ufw
      sudo ufw enable
      
      # list the rules
      sudo ufw status verbose
      



Javascript: parse a string of email addresses and contact names








A string contains contact name and email, like below
"Jake Smart" , jack@smart.com, "Development, Business"

We want to parse it into an array of objects (the object has name and email attributes):


// the parser function
function parse(s){
    var os = [];
    var regex = /(?:"([^"]+)")? ?<?(.*?@[^>,]+)>?,? ?/g;
    while(m=regex.exec(s)){
        os.push({name:m[1],email:m[2]});
    }
    return os;
}

// the code below is to test the parser function
var str = '"Jake Smart" <jake@smart.com>, jack@smart.com, "Development, Business" <bizdev@smart.com>';
var objects = parse(str);
for(var i=0;i<objects.length;i++){
    var object = objects[i];
    document.write(object.name + " : " + object.email + "<br/>");
}

See also Javascript: RegEx.exec() method




Online Javascript Executor/Evaluator: Jash











Blogger: Rename a label








  1. If you are using the new/updated Blogger interface, you need to switch back to the old interface.
  2. Activate "Posting" tab, the "Edit posts" subtab
  3. In the "Labels Actions...", select "New label...", the type the new label that you want to rename to, click "OK" to create the (new) label.

  4. In the "Labels" sidebar, click the (old) label you want to rename. It will then show all the posts with that (old) label.
  5. Select all the posts with the (old) label, in "Label Actions..." select that (old) label under "Remove Label" section:
  6. In "Label actions...", select the (new) label under "Apply Label" section
  7. After rename the label, you can switch back to the new/updated Blogger interface.

SEE ALSO:




convert a positive number to negative









    int a = 1;
    int b;
    b = -1 * a;

    double c = -1.0;
    int d;
    d = -1 * c;

    System.out.println(b);
    System.out.println(d);



Mac OS X Lion: Virtual Desktops








See Also: http://www.tuaw.com/2011/07/20/mac-os-x-lion-and-mission-control/




Mac OS X Lion: Shortcuts to open Mission Control








  • Use Touchpad: swipe up with 3 or 4 fingers
  • Use Magic Mouse: double tapping the mouse surface
  • Use Mac Keyboard: Dashboard key (F3 on my MacBook Pro)
  • Find Mission Control app from Applications and keep it in Dock
  • Find Mission Control app using Spotlight

See Also: http://www.tuaw.com/2011/07/20/mac-os-x-lion-and-mission-control/




Mac OS X: Convert TIFF to PNG using Preview








  • Open the TIFF file using Preview
  • File -> Export -> Format: PNG -> Save



Mac OS X: change the default application to open a type of file








  • Right Click (or Ctrl + Left Click) the file,
  • Select "Open With..." from the popup menu
  • Select "Other..." in the submenu
  • Select the application and tick "Always Open With" then click "Open" Button



How to enable Java applet in your web browser?











Mac OS X Lion: how to exit Terminal full screen mode








  • Use key combo: command + option + F can enter/exit full screen mode when you are using Terminal.
  • Alternatively, use the mouse: 
    • To enter full screen mode: click the top-right corner icon of the terminal window
    • To exit full screen mode: mouse over the top for a while, system menu will appear, you can then select "View" -> "Enter Full Screen Mode"



JavaCC: The Java Parser Generator











Java CLI argument parser








See also: stackoverflow




ZTE Tablet V9 blade (Optus Mytab) Resources








ZTE Tablet V9 (Blade) Optus Australia


  1. Unlock from Optus (Using the following unlock code calculators)
  2. Official firmware upgrade (Android 2.2)
  3. Root the phone using z4root (Android 2.2)

See also:

ZTE V9 wiki page at [whirlpool.net.au]



Droidhen Defender Game Hack








Droidhen Defender is an free Android game.

Prerequisites:
  • Root your device. Do not how to root your device? google + root
  • Install a root file manager app: super manager (free) or root explorer (non-free)


The game saves files at /data/data/com.droidhen.defender/shared_prefs, named: save0.xml save1.xml save2.xml

The save file is in the following format:
<?xml version='1.0' encoding='utf-8' standalone='yes' ?>
<map>
<int name="magicStone" value="6" />
<string name="magicStonecheckValue">1e0e72ebd00ab9e2535db46431d29e93</string>
<int name="singleRetry" value="0" />
<int name="stage" value="2" />
<int name="gold" value="2200" />
<string name="goldcheckValue">a1a566f1d427b549f7b7c8dac5f0cb36</string>
<int name="hardMode" value="0" />
</map>


To change the values of gold and magic stone, we need to not only change the value of gold and magicStone, but also goldcheckValue and magicStonecheckValue. How to calculate the checkValue? Use the following fomula:

checkValue = md5(value+"checkChar") 

To calculate the checkValue for value 100000000:
  • If you are using Mac, run
    md5 -s 100000000checkChar
    in the Terminal window.
  • If you are using Linux run
    echo -n 100000000checkChar | md5sum
    in the terminal window
  • Or you can open this web page and type 100000000checkChar and click Calculate MD5 button

You should get the checkValue for 100000000,
4293191e6b63499927db54f204f7eb30

  1. You can copy the file, e.g. save0.xml, to /mnt/sdcard/ using your root file manager: super manager.
  2. Edit it with text editor
    • Modify the gold and magicStone to 100000000
    • Modify the goldcheckValue and magicStonecheckValue to 4293191e6b63499927db54f204f7eb30
  3. You modified save0.xml looks like below:

    <?xml version='1.0' encoding='utf-8' standalone='yes' ?>
    <map>
    <int name="magicStone" value="100000000" />
    <string name="magicStonecheckValue">4293191e6b63499927db54f204f7eb30</string>
    <int name="singleRetry" value="0" />
    <int name="stage" value="2" />
    <int name="gold" value="100000000" />
    <string name="goldcheckValue">4293191e6b63499927db54f204f7eb30</string>
    <int name="hardMode" value="0" />
    </map>
    
  4. Copy the modified save0.xml file back to /data/data/com.droidhen.defender/shared_prefs
  5. Start the game and load the saved file, you can now use the gold and magic stone to buy and upgrade anything.

See Also

http://forum.xda-developers.com/showthread.php?t=1335611&page=3



Acer Liquid Metal (S120) Mobile Phone Resources











Java SSH implementation








JSch is a pure Java implementation of SSH2. JSch allows you to connect to an sshd server and use port forwarding, X11 forwarding, file transfer, etc., and you can integrate its functionality into your own Java programs.



Install Windows Phone Developer Tools on Windows XP








  • Download Windows Phone Developer Tools RTW
  • Open "Command Prompt" and type the following command to extract vm_web.exe file:
    vm_web.exe /x
  • Find baseline.dat file from the extracted files and open it with notepad:
    • Find ‘gencomp7788’ section and change this two entries from 1 to 0:
      InstallOnLHS=0
      InstallOnWinXP=0
      
    • Save the file
  • Run setup.exe /web in the extracted folder to start the installation

See also: Windows Phone 7 CTP Windows XP bypass?




Windows Phone 7 Development Resources











Windows Phone 7 Development using Mac








Requires
  •  VMWare Fusion
  •  Windows 7 installation disc/ISO image and proper License 
 Installation:
  1. Create a new Window 7 VM in VMWare Fusion and install Windows 7
  2. Install Windows Phone 7 SDK in the VM
Issues:
  • XNA applications will not work in the Windows Phone Emulator
  • Windows Phone Emulator is slower than that in a physical machine

See also:



Android SDK Dev Guide in PDF








Android SDK Dev Guide in PDF

You can convert the PDF files into EPUB or MOBI format using Calibre so that you can read it on your kindle or other ereaders.
The official Android Developer web site: http://developer.android.com



Use OEM BIOS file in VMWare virtual machine








  • Create a VM but do not start installation, assume the VM is named "Windows 7" 
  • Quit VMWare Fusion 
  • Edit the .vmx file in "/Users/${USER}/Documents/Virtual Machines.localized"
    vi /Users/${USER}/Documents/Virtual Machines.localized/Windows\ 7.vmwarevm/Windows\ 7.vmx 
    • add line:
      bios440.filename = "MY_OEM.ROM"

> See also:



How to install your OEM certificate on Windows 7









  • Click Start, click All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator.
  • Click OK.
  • At a command prompt, type the following command, and then press ENTER:
  • slmgr.vbs -ilc oem-cert.xml
See Also:



DICOM Value Representation (VR)








VR Definition Details
AE Application Entity
A string of characters with leading and trailing spaces (20H) being non-significant. The value made of 16 spaces, meaning "no application name specified", shall not be used.
Character Repertoire
Default Character Repertoire excluding control characters LF, FF, CR and ESC.
Length 16 bytes maximum
Data Type
String
AS Age String
A string of characters with one of the following formats -- nnnD, nnnW, nnnM, nnnY; where nnn shall contain the number of days for D, weeks for W, months for M, or years for Y.

Example - "018M" would represent an age of 18 months.
Character Repertoire
"0"-"9", "D", "W", "M", "Y" of Default Character Repertoire
Length 4 bytes fixed 
Data Type
String
AT Attribute Tag
Ordered pair of 16-bit unsigned integers that is the value of a Data Element Tag. 
Example -
A Data Element Tag of (0018,00FF) would be encoded as a series of 4 bytes in a Little-Endian Transfer Syntax as 18H,00H,FFH,00H and in a Big-Endian Transfer Syntax as 00H,18H,00H,FFH. Note - The encoding of an AT value is exactly the same as the encoding of a Data Element Tag as defined in Section 7.
Character Repertoire Not applicable 
Length
4 bytes fixed
Data Type uint32
CS Code String
A string of characters with leading or trailing spaces (20H) being non-significant.
Character Repertoire
Uppercase characters, "0"-"9", the SPACE character, and underscore "_", of the Default Character Repertoire
Length
16 byte maximum
Data Type String
DA Date
A string of characters of the format yyyymmdd; where yyyy shall contain year, mm shall contain the month, and dd shall contain the day. This conforms to the ANSI HISPP MSDS Date common data type.
Example -
"19930822" would represent August 22, 1993.
Note -
1. For reasons of backward compatibility with versions of this standard prior to V3.0, it is recommended that implementations also support a string of characters of the format yyyy.mm.dd for this VR.
2. See also DT VR in this table. Note - For reasons specified in the previous column, implementations may wish to support the "." character as well.
Character Repertoire
"0"-"9" of Default Character Repertoire
Length 8 bytes fixed
Note - For reasons specified in the previous columns, implementations may also wish to support a 10 byte fixed length as well.
Data Type String
DL Delimitation
DS Decimal String
A string of characters representing either a fixed point number or a floating point number. A fixed point number shall contain only the characters 0-9 with an optional leading "+" or "-" and an optional "." to mark the decimal point. A floating point number shall be conveyed as defined in ANSI X3.9, with an "E" or "e" to indicate the start of the exponent. Decimal Strings may be padded with leading or trailing spaces. Embedded spaces are not allowed.
Character Repertoire
"0" - "9", "+", "-", "E", "e", "." of Default Character Repertoire
Length
16 bytes maximum
Data Type
String
DT DATE TIME
The Date Time common data type. Indicates a concatenated date-time ASCII string in the format: YYYYMMDDHHMMSS.FFFFFF&ZZZZ The components of this string, from left to right, are YYYY = Year, MM = Month, DD = Day, HH = Hour, MM = Minute, SS = Second, FFFFFF = Fractional Second, & = "+" or "-", and ZZZZ = Hours and Minutes of offset. &ZZZZ is an optional suffix for plus/minus offset from Coordinated Universal Time. A component that is omitted from the string is termed a null component. Trailing null components of Date Time are ignored. Non-trailing null components are prohibited, given that the optional suffix is not considered as a component. Note - For reasons of backward compatibility with versions of this standard prior to V3.0, many existing DICOM Data Elements use the separate DA and TM VRs. Standard and Private Data Elements defined in the future should use DT, when appropriate, to be more compliant with ANSI HISPP MSDS.
Character Repertoire
"0" - "9", "+", "-", "." of Default Character Repertoire
Length
26 bytes maximum
Data Type String
FL Floating Point Single
Single precision binary floating point number represented in IEEE 754:1985 32-bit Floating Point Number Format.
Character Repertoire Not applicable
Length 4 bytes fixed
Data Type
float
FD Floating Point Double
Double precision binary floating point number represented in IEEE 754:1985 64-bit Floating Point Number Format.
Character Repertoire Not applicable
Length
8 bytes fixed
Data Type
double
IS Integer String
A string of characters representing an Integer in base-10 (decimal), shall contain only the characters 0 - 9, with an optional leading "+" or "-". It may be padded with leading and/or trailing spaces. Embedded spaces are not allowed. The integer, n, represented shall be in the range:
-231 <= n <= (231 - 1).
Character Repertoire
"0"-"9", "+", "-" of Default Character Repertoire
Length
12 bytes maximum
Data Type
String
LO Long String
A character string that may be padded with leading and/or trailing spaces. The character code 5CH (the BACKSLASH "\" in ISO-IR 6) shall not be present, as it is used as the delimiter between values in multiple valued Default Character Repertoire and/or as defined by (0008,0005).
Character Repertoire 64 chars
Length 64 chars maximum
Note - The length of the VRs for which the Character Repertoire can be extended or replaced are expressly specified in characters rather than bytes because the mapping from a character to the number of bytes used for that character's encoding may be dependent on the character set used.
IDL Data Type STRING
LT Long Text A
character string that may contain one or more paragraphs. It may contain the Graphic Character set and the Control Characters, CR, LF, FF, and ESC. It may be padded with trailing spaces, which may be ignored, but leading spaces are considered to be significant. Data Elements with this VR shall not be multi-valued and therefore character code 5CH (the BACKSLASH "\" in ISO-IR 6) may be used. Default Character Repertoire and/or as defined by (0008,0005).
Character Repertoire 10240 chars
Length
10240 chars maximum
Note - The length of the VRs for which the Character Repertoire can be extended or replaced are expressly specified in characters rather than bytes because the mapping from a character to the number of bytes used for that character's encoding may be dependent on the character set used.
Data Type String
OB Other Byte String
A string of bytes where the encoding of the contents is specified by the negotiated Transfer Syntax. OB is a VR which is insensitive to Little/Big Endian byte ordering (see Section 7.3 of Digital Imaging and Communications in Medicine (DICOM) - Part 5: Data Structures and Encoding). The string of bytes shall be padded with a single trailing NULL byte value (00H) when necessary to achieve even length.
Character Repertoire Not applicable
Length
See Transfer Syntax definition
Data Type
byte
OF Other Float String
A string of 32-bit IEEE 754:1985 floating point words. OF is a VR which requires byte swapping within each 32-bit word when changing between Little Endian and Big Endian byte ordering (see Section 7.3 of Digital Imaging and Communications in Medicine (DICOM) - Part 5: Data Structures and Encoding).
Character Repertoire Not applicable
Length
232-4 maximum
Data Type float
OW Other Word String
A string of 16-bit words where the encoding of the contents is specified by the negotiated Transfer Syntax. OW is a VR which requires byte swapping within each word when changing between Little Endian and Big Endian byte ordering (see Section 7.3 of Digital Imaging and Communications in Medicine (DICOM) - Part 5: Data Structures and Encoding).
Character Repertoire Not applicable
Length See Transfer Syntax definition
Data Type int16
PN Person Name
A character string encoded using a 5 component convention. The character code 5CH (the BACKSLASH "\" in ISO-IR 6) shall not be present, as it is used as the delimiter between values in multiple valued data elements. The string may be padded with trailing spaces. The five components in their order of occurrence are: family name complex, given name complex, middle name, name prefix, name suffix. Any of the five components may be an empty string. The component delimiter shall be the caret "^" character (5EH). Delimiters are required for interior null components. Trailing null components and their delimiters may be omitted. Multiple entries are permitted in each component and are encoded as natural text strings, in the format preferred by the named person. This conforms to the ANSI HISPP MSDS Person Name common data type. This group of five components is referred to as a Person Name component group. For the purpose of writing names in ideographic characters and in phonetic characters, up to 3 groups of components (see Annex H examples 1 and 2) may be used. The delimiter for component groups shall be the equals character "=" (3DH). The three component groups of components in their order of occurrence are: a single-byte character representation, an ideographic representation, and a phonetic representation. Any component group may be absent, including the first component group. In this case, the person name may start with one or more "=" delimiters. Delimiters are required for interior null component groups. Trailing null component groups and their delimiters may be omitted. Precise semantics are defined for each component group. See section 6.2.1 of Digital Imaging and Communications in Medicine (DICOM) - Part 5: Data Structures and Encoding.

Examples:
Rev. John Robert Quincy Adams, B.A. M.Div. "Adams^John Robert Quincy^^Rev.^B.A. M.Div." [One family name; three given names; no middle name; one prefix; two suffixes.] Susan Morrison-Jones, Ph.D., Chief Executive Officer "Morrison-Jones^Susan^^^Ph.D., Chief Executive Officer" [Two family names; one given name; no middle name; no prefix; two suffixes.] John Doe "Doe^John" [One family name; one given name; no middle name, prefix, or suffix. Delimiters have been omitted for the three trailing null components.] (for examples of the encoding of Person Names using multi-byte character sets see Annex H of Digital Imaging and Communications in Medicine (DICOM) - Part 5: Data Structures and Encoding) Note - 1. This five component convention is also used by HL7 as defined in ASTM E-1238-91 and further specialized by the ANSI MSDS. 2. In typical American and European usage the first occurrence of "given name" would represent the "first name". The second and subsequent occurrences of the "given name" would typically be treated as a middle name(s). The "middle name" component is retained for the purpose of backward compatibility with existing standards. 3. The "Degree" component present in ASTM E-1238-91 is absorbed into the "Suffix" component.
Character Repertoire Default Character Repertoire and/or as defined by (0008,0005) excluding Control Characters LF, FF, and CR but allowing Control Character ESC.

Length
64 chars maximum per component group

Note - The length of VRs for which the Character Repertoire can be extended or replaced are expressly specified in characters rather than bytes because the mapping from a character to the number of bytes used for that character's encoding may be dependent on the character set used.

Data Type String
SH Short String
A character string that may be padded with leading and/or trailing spaces. The character code 05CH (the BACKSLASH "\" in ISO-IR 6) shall not be present, as it is used as the delimiter between values for multiple data elements. The string shall not have Control Characters except ESC. Default Character Repertoire and/or as defined by (0008,0005).
Character Repertoire 16 chars 
Length
16 chars maximum
Note - The length of VRs for which the Character Repertoire can be extended or replaced are expressly specified in characters rather than bytes because the mapping from a character to the number of bytes used for that character's encoding may be dependent on the character set used. 
Data Type
String
SL Signed Long
Signed binary integer 32 bits long in 2's complement form. Represents an integer, n, in the range:
- 231 <= n <= (231 - 1)
Character Repertoire Not applicable
Length 4 bytes fixed
Data Type int32
SQ Sequence of Items Value is a Sequence of zero or more Items, as defined in Section 7.5 of Digital Imaging and Communications in Medicine (DICOM) - Part 5: Data Structures and Encoding). Character Repertoire Not applicable
Length Not applicable
Data Type int32
SS Signed Short
Signed binary integer 16 bits long in 2's complement form. Represents an integer n in the range:
-215 <= n <= (215 - 1)
Character Repertoire Not applicable
Length 2 bytes fixed
IDL Data Type
int16
ST Short Text
A character string that may contain one or more paragraphs. It may contain the Graphic Character set and the Control Characters, CR, LF, FF, and ESC. It may be padded with trailing spaces, which may be ignored, but leading spaces are considered to be significant. Data Elements with this VR shall not be multi-valued and therefore character code 5CH (the BACKSLASH "\" in ISO-IR 6) may be used. Default Character Repertoire and/or as defined by (0008,0005).
Character Repertoire 1024 chars
Length
1024 chars maximum
Note - The length of Value Representations for which the Character Repertoire can be extended or replaced are expressly specified in characters rather than bytes because the mapping from a character to the number of bytes used for that character's encoding may be dependent on the character set used.
Data Type
String
TM Time
A string of characters of the format hhmmss.frac; where hh contains hours (range "00" - "23"), mm contains minutes (range "00" - "59"), ss contains seconds (range "00" - "59"), and frac contains a fractional part of a second as small as 1 millionth of a second (range "000000" - "999999"). A 24 hour clock is assumed. Midnight can be represented by only "0000" since "2400" would violate the hour range. The string may be padded with trailing spaces. Leading and embedded spaces are not allowed. One or more of the components mm, ss, or frac may be unspecified as long as every component to the right of an unspecified component is also unspecified. If frac is unspecified the preceding "." may not be included. Frac shall be held to six decimal places or less to ensure its format conforms to the ANSI HISPP MSDS Time common data type.
Examples -
1. "070907.0705" represents a time of 7 hours, 9 minutes and 7.0705 seconds. 2. "1010" represents a time of 10 hours, and 10 minutes. 3. "021" is an invalid value. Note - 1. For reasons of backward compatibility with versions of this standard prior to V3.0, it is recommended that implementations also support a string of characters of the format hh:mm:ss.frac for this VR. 2. See also DT VR in this table.
Character Repertoire
"0" - "9", "." of Default Character Repertoire

Length
16 bytes maximum

Data Type
String
UI Unique Identifier
A character string containing a UID that is used to uniquely identify a wide variety of items. The UID is a series of numeric components separated by the period "." character. If a Value Field containing one or more UIDs is an odd number of bytes in length, the Value Field shall be padded with a single trailing NULL (00H) character to ensure that the Value Field is an even number of bytes in length. See Section 9 and Annex B of Digital Imaging and Communications in Medicine (DICOM) - Part 5: Data Structures and Encoding for a complete specification and examples.
Character Repertoire
"0" - "9", "." of Default Character Repertoire 
Length
64 bytes maximum 
Data Type
String
UL Unsigned Long
Unsigned binary integer 32 bits long. Represents an integer n in the range:
0 <= n < 232
Character Repertoire Not applicable
Length 4 bytes fixed 
Data Type
uint32
UN Unknown
A string of bytes where the encoding of the contents is unknown (see Section 6.2.2 of Digital Imaging and Communications in Medicine (DICOM) - Part 5: Data Structures and Encoding).
Character Repertoire Not applicable
Length Any length valid for any of the other DICOM VRs 
Data Type
byte
US Unsigned Short
Unsigned binary integer 16 bits long. Represents integer n in the range:
0 <= n < 216
Character Repertoire Not applicable
Length 2 bytes fixed 
Data Type
uint16
UT Unlimited Text
A character string that may contain one or more paragraphs. It may contain the Graphic Character set and the Control Characters, CR, LF, FF, and ESC. It may be padded with trailing spaces, which may be ignored, but leading spaces are considered to be significant. Data Elements with this VR shall not be multi-valued and therefore character code 5CH (the BACKSLASH "\" in ISO-IR 6) may be used. The text will be interpreted as specified by Specific Character Set (0008,0005).
Character Repertoire
Default Character Repertoire and/or as defined by (0008,0005).
Length 2 32 -2
Note - Limited only by the size of the maximum unsigned integer representable in a 32 bit VL field minus one, since FFFFFFFFH is reserved. 
Data Type
String




东北小伙模仿外国人说英语(日韩印度英法意美俄中)











Java: substract a year on a given Date








Calendar calendar = Calendar.getInstance();
calendar.setTime(givenDate);
calendar.add(Calendar.YEAR, -1); 



Free online diagram drawing tools








See also Online Diagramming




Turn off code formatting for certain lines in Eclipse 3.6+








Often, we do not want eclipse to auto-format some lines. In Eclipse 3.6+ you can turn off code formatting:


  • Preferences -> Java ->  Code Style -> Formatter
  • Create your own profile if you have not done it yet: New... 
  • Edit your profile, in the Off/On Tags, Enable Off/On Tags



Now in the source code you can
   // @format off
   ... ... ..
   // @format on

See also New features in Eclipse 3.6




GWT Developer's plugin for Firefox 10








https://dl.google.com/dl/gwt/plugins/firefox/1.0.10862/gwt-dev-plugin.xpi


See also




Microseconds in Java








SimpleDateFormat in java does not support microseconds. It supports down to milliseconds only.
In some cases, we want to parse Time from string, which includes microseconds, or format a Date/Time to a string (with microseconds).
Here are some sample java code to work around this problem.

public class DateTimeUtil {

   public static final String FORMAT_PATTERN = "yyyyMMddHHmmss.SSS000";

   public static Date parse(String ds) throws Throwable {

    String[] tokens = ds.split("\\.");
    if (tokens.length != 2) {
     throw new Exception("Invalid date string: " + ds);
    }
    int fractionalSecs = Integer.parseInt(tokens[1]) / 1000;
    return new SimpleDateFormat("yyyyMMddHHmmss.SSS").parse(String.format("%s.%03d", tokens[0], fractionalSecs));
   }

   public static String format(Date date) {
  
    return new SimpleDateFormat(FORMAT_PATTERN).format(date);
   }

}


See also http://stackoverflow.com/questions/2132247/custom-date-format-cannot-be-parsed-java


Remote desktop to Windows 7 (or Windows 2008 server) which requires Network Level Authentication using freeRDP








FreeRDP is a free, open source implementation of the RDP protocol, according to the Microsoft Open Specifications. It is released under the Apache License and is available on OS X, Cygwin for Microsoft Windows, FreeBSD, Linux, Solaris.

As of January 2012, FreeRDP adds support for Network Level Authentication. You can then use FreeRDP to connect to Windows 7 or Windows Server 2008 which requires NLA by default.

Note: freeRDP is commonly used on Linux. Since
To install freeRDP on Ubuntu Linux:
  • sudo add-apt-repository ppa:freerdp-team/freerdp
  • sudo apt-get update
  • sudo apt-get install freerdp
To use freerdp to connect to a remote Windows machine:
xfreerdp --plugin cliprdr -g 1024x768 -k no -u {username} -d {domain} {remote-windows-machine}



Enable network level authentication on Windows XP








By default, remote desktop server (Terminal server) on Windows Vista or Windows 7 requires the client to have network level authentication enabled. However, Windows XP does not have network level authentication enabled by default.

You can allow non-NLA client to connect on the server side. I do not recommend to do that because it downgrades the security.

To enable network level authentication on Windows XP, first, you have to make sure you have upgraded to Windows XP Service Pack 3. The NLA is not enabled in Windows XP SP3 by default, you also need to do the following to enable it:
  1. Click Start, click Run, type regedit, and then press Enter.
  2. In the navigation pane, locate and then click the following registry subkey:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
    In the details pane, right-click Security Packages, and then click Modify.
    In the Value data box, type tspkg. Leave any data that is specific to other SSPs, and then click OK.
  3. In the navigation pane, locate and then click the following registry subkey:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders
    In the details pane, right-click SecurityProviders, and then click Modify.
    In the Value data box, type credssp.dll. Leave any data that is specific to other SSPs, and then click OK.
  4. Exit regedit and restart the computer