java-programmer >>Capture keystroke

Capture keystroke

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- 2
  - On Java and C++On 28 Apr 2006 00:59:19 -0700, "al pacino" <email***@***.com>
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    range of quality. If you look at Java code it is much more uniform.
    The artisan in you yearns for the sporadic brilliance, but the manager
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    I would like to know more about JAVA and its applications in the real
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  - java & CGII am a programming student attempting a quoting system (similar to what
    geico does) for my job. I've written a program that is executable from
    the command prompt that returns the expected values, but I need it to
    work with a webpage.
    
    I want the user to be able to input data, the program process it, and
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    difficulty finding answers.
    
    Thanks in advance to anyone who can help.

Author

Message

Brian Simpson

Posted: 2004-1-22 23:10:00

Top

java-programmer, Capture keystroke Hi,

I have a command line java program and I am trying to capture a keypress
from the user to say pause or stop the program. The only way I can get
this to work at the moment is to read in a key but the program waits for
the user to press return. I don't want this. I want to read the keypress
asynchronously without the user hitting return.

Anybody give me some pointers to how to do this?

Thanks in advance

Brian

Gordon Beaton

Posted: 2004-1-22 23:33:00

Top

java-programmer >> Capture keystroke On Thu, 22 Jan 2004 15:09:51 +0000, Brian Simpson wrote:
> I have a command line java program and I am trying to capture a
> keypress from the user to say pause or stop the program. The only
> way I can get this to work at the moment is to read in a key but the
> program waits for the user to press return. I don't want this. I
> want to read the keypress asynchronously without the user hitting
> return.
>
> Anybody give me some pointers to how to do this?

That isn't the fault of Java. It isn't until the user presses enter
that the OS tells the JVM that the user has typed anything. The
solution is to tell your operating system to stop line buffering the
user's input. Exactly how you do that (and whether it's even possible)
depends on your OS. Here's a solution for unix-like systems:

http://groups.google.com/groups?selm=bde5sk$o7f$email***@***.com

Other than that, your choices are to use a GUI or a native helper to
call some OS-dependent function to read the keypress.

Or you could just tell the user to press enter.

/gordon

--
[ do not email me copies of your followups ]
g o r d o n + n e w s @ b a l d e r 1 3 . s e

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    line 5
    
    line 6
    
    I tried turning on the MULTILINE and DOTALL flags and used the
    following pattern:
    (.+?)^$
    
    which is close but prepends a newline to the 2nd and subsequent calls
    to Matcher.find().
    
    The first line of every paragraph is the same, if that helps.
    
    Regex's are cool, but frustrating....
- 9
  - Eclipse : JCE problemHi,
    
    I have this exception when I launched an application from Eclipse 2.1.
    
    java.security.NoSuchProviderException: JCE cannot authenticate the provider
    SunJCE java.lang.NullPointerException
    at javax.crypto.SunJCE_b.a(DashoA6275)
    at javax.crypto.SunJCE_b.a(DashoA6275)
    at javax.crypto.SecretKeyFactory.getInstance(DashoA6275)
    at
    cms.security.SecurityConfiguration.getSecretKeyFactory(SecurityConfiguration
    .java:196)
    at
    cms.kms.PBEKeyHandlingService.loadValuesFromSecurityConfig(PBEKeyHandlingSer
    vice.java:276)
    at
    cms.kms.PBEKeyHandlingService.<init>(PBEKeyHandlingService.java:114)
    at cms.backend.JCECryptoService.<init>(JCECryptoService.java:129)
    at services.CryptoService.<init>(CryptoService.java:68)
    ...
    
    I'm using JDK ver. 1.4.0. I'm have replaced local_policy.jar and
    US_export_policy.jar with an unlimited strength version.
    
    However, this exeception is NOT thrown when I launched the same application from
    command line. It only happen when I executed it inside Eclipse environment.
    Any advice?
    
    TQ
    
    /lim/
- 10
  - Problem with table nameHi!
    
    I have a problem to access tables in an Informix Database. Table names
    are something like that :
    informix.pv_tvvte
    
    When I try a "SELECT informix.pv_tvvte.numero_vente FROM
    informix.pv_tvvte WHERE informix.pv_tvvte.numero_vente=#value#", (I use
    ibatis and spring) I get a syntax error exception (SQLException "Bad SQL
    Grammar").
    
    If I replace dot with "_" in the name, I get a "Table Not Found" Exception.
    
    How could I escape the dot in the tables names ?
    
    TIA
    
    Arnaud
- 11
  - to whom it may concern
    "pcbutts1" <email***@***.com> wrote in message
    news:4e23e9d12ed44ede9a25a80dde27d810@erollscom...
    >
    > You don't, by any chance, have a tape recorder?
    >
    
    No. But I do own a shovel. I also own several high powered rifles and I'm
    very proficient in using them. Capisce?
- 12
  - JBoss 3.2.2 security
    Hello,
    
    I'm developing EJB based system on JBoss. The system consists of
    two parts: the set of EJB's, mainly Entity Beans which are interfaces
    to DB and servlet which is used as user interface. As the interface to
    entity beans i'm using statefull session bean. Every call from servlet
    have to pass throught it.
    To authenticate users I'm using DatabaseServerLoginModule. Users are
    able to login, but then they try again to execute eny method from
    session bean the server throws exception
    Authentication exception, principal=null
    What am i doing wrong ?? Should I store the users principal or
    it is stored in session context ?
    
    Cheers,
    --
    Marcin Krasowski mkrasowski (at) zagiel (dot) com (dot) pl
    
    To iterate is human, to recurse divine.
    L. Peter Deutsch
- 13
  - recognizing java processesHow would you recognize a java process (as java process) in runtime
    from outside the JVM? (win32)
    
    is there a nicer way than monitorizing DLL loads in order to detect
    the jvm.dll/javai.dll load?
- 14
  - The solutions are very OS specific.Hi Mark Thornton,
    
    You wrote,
    " The rough equivalent to an HDC is
    a java.awt.Graphics object,
    extended ( since Java 1.2 ) to java.awt.Graphics2D.
    These are used for drawing to screens, printers
    or into a BufferedImage. "
    
    That's quit impressive,
    But my bank simulation currently requires Excel,
    which precludes Linux.
    
    Also, if I ever moved my simulations to Direct Draw 7,
    or even Direct 3D 9 ( instead of the GDI )
    once again I'd be forced to use C++,
    as DD7's interaction with MS windows is very tricky
    and very OS specific.
    
    For example,
    Windows' taskbar hoards it's mouse messages.
    The taskbar also turns on the system cursor,
    which blocks VRAM-to-VRAM blts.
    The solutions are very OS specific.
    
    Would the bankers pay for that ? I doubt it.
- 15
  - Reading an array of byte with special delimiter....help me!!Hi guys,
    i've developed a java application that has in input a txt file with a
    standard format
    
    string string string
    string double double
    string double double
    
    and stores it into an array of byte with a fixed format,
    that is
    byte(whitespace)byte(whitespace)byte(;)byte(whitespace)byte(whitespace)byte(;)byte(whitespace)byte(whitespace)byte(;)
    
    that mean introducing byte whitespace value and byte ; value to
    separate different columns and different rows.
    Now i have to develop inverse routine,that has to read the array of
    byte and rebuild its original format.
    Can you help me with some idea ord code?
    I'm inexepert...please help me with clear suggest...
    I post you my routine that converts txt file into an array of byte
    P.S.In my txt file number of columns and rows change for each file,what
    is standard is a firtst headline that is an array of string and others
    row with the same format string array of doubles....
    
    [code]public byte[] getBytes(){
    byte middlerow=' ';
    byte endrow=';';
    Vector temp=new Vector(10000000);
    int i=0;
    String g=null;
    Riga r;
    Double val[];
    while(i<intest.length){
    //copio tutto nell'array di byte
    byte []bytes = intest[i].getBytes();
    // memorizza in byte un elemento del vettore alla volta
    for( Byte aByte : bytes ) {
    temp.addElement( aByte );
    
    }
    
    temp.addElement( Byte.valueOf( middlerow ) );
    
    i++;
    }
    temp.addElement(Byte.valueOf(endrow));
    System.out.println("Intestazione convertita in byte");
    
    for(int l=0;l<rows.size()-1;l++){
    r=(Riga)rows.get(l);
    g=r.getgeneid();
    temp.addElement(g.getBytes());
    temp.addElement(Byte.valueOf(middlerow));
    val=r.getvalues();
    
    for(int e=0;e<=val.length-1;e++){
    
    temp.addElement(Byte.valueOf(val[e].byteValue()));
    //val[e].byteValue() fa il casting double in byte
    temp.addElement(Byte.valueOf(middlerow));
    }
    temp.addElement(Byte.valueOf(endrow));
    
    }
    
    byte [] b=new byte[temp.size()];
    
    for (int k=0;i<temp.size();i++){
    b[k]=(((Byte)temp.elementAt(k)).byteValue());
    }
    return b;
    
    }[/code]
    
    Thanks for your help...