java - Can't hear any sounds from MIDI -

-

i'm starting java, , tryin' play sounds using midi. i'm following "head first" book. problem can't hear sound, here's code

package pakedz; import javax.sound.midi.*;  public class odtwarzaczmuzyki {   public void graj(){    try {     sequencer sekwenser = midisystem.getsequencer();     system.out.println("mamy sekwenser");     sekwenser.open();      sequence sekwencja = new sequence(sequence.ppq,4);     track sciezka = sekwencja.createtrack();      shortmessage = new shortmessage();     a.setmessage(144, 1, 20, 100);     midievent nutap = new midievent(a, 1);     sciezka.add(nutap);     shortmessage b = new shortmessage();     b.setmessage(128, 1, 44, 100);     midievent nutak = new midievent(b, 16);     sciezka.add(nutak);       sekwenser.setsequence(sekwencja);   } catch (exception ex) {      system.out.println("kutasmarian"); }   };   public static void main (string[] args){  odtwarzaczmuzyki radio = new odtwarzaczmuzyki();  radio.graj();   }  }

i'm using java 8.0

need call start() method in sequencer. below modified (untested) code.

recommend checking javadoc , official tutorials.

package pakedz; import javax.sound.midi.*;  public class odtwarzaczmuzyki {   public void graj(){     try {       sequencer sekwenser = midisystem.getsequencer();       system.out.println("mamy sekwenser");       sekwenser.open();        sequence sekwencja = new sequence(sequence.ppq,4);       track sciezka = sekwencja.createtrack();        shortmessage = new shortmessage();       a.setmessage(144, 1, 20, 100);       midievent nutap = new midievent(a, 1);       sciezka.add(nutap);       shortmessage b = new shortmessage();       b.setmessage(128, 1, 44, 100);       midievent nutak = new midievent(b, 16);       sciezka.add(nutak);        sekwenser.setsequence(sekwencja);       sekwenser.start();      }     catch (exception ex) {        system.out.println("kutasmarian");     }   };    public static void main (string[] args) {     odtwarzaczmuzyki radio = new odtwarzaczmuzyki();     radio.graj();   } }

Comments

Post a Comment

Popular posts from this blog

java - nested exception is org.hibernate.exception.SQLGrammarException: could not extract ResultSet Hibernate+SpringMVC -

-
i trying fetch records database , having above error this classs appropriate getters , setters public class user { private int id; private string username; private string password; private string email; i have create database , inserted data below configuration <bean id="datasource" class="org.apache.commons.dbcp2.basicdatasource" destroy-method="close"> <property name="driverclassname" value="com.mysql.jdbc.driver"/> <property name="url" value="jdbc:mysql://localhost:3306/usersdb"/> <property name="username" value="root"/> <property name="password" value=""/> </bean> this complete stacktrace severe: servlet.service() servlet [appservlet] in context path [/spring] threw exception [request processing failed; nested exception org.hibernate.exception.sqlgrammarexception: not ...
Read more

sql - Postgresql tables exists, but getting "relation does not exist" when querying -

-
Image
i have postgresql db number of tables. if query: select column_name information_schema.columns table_name="my_table"; i list of columns returned properly. however, when query: select * "my_table"; i error: (programmingerror) relation "my_table" not exist 'select *\n "my_table"\n' {} any thoughts on why can columns, can't query table? goal able query table. you have include schema if isnt public one select * <schema>."my_table" or can change default schema show search_path; set search_path my_schema; check table schema here select * information_schema.columns for example if table on default schema public both works ok select * parroquias_region select * public.parroquias_region but sectors need specify schema select * map_update.sectores_point
Read more

asp.net mvc - breakpoint on javascript in CSHTML? -

-
i have .cshtml file has javascript tag. within script tag have few lines of javascript. first line of javascript refers property in @viewbag. other javascript lines plain script without mvc related references. observation: can place breakpoints (visual studio 2015) on each of these javascript lines. however, breakpoints has white dot in center of breakpoint symbol (red circle) except line @viewbag reference (this particular line not have white dot in center). it seems breakpoint without white dot hit during run-time. question: can explain going on here? white dot mean? why plain red breakpoint line line hitting breakpoint? the visual studio debugger expecting debug actual server-side code within .cshtml file opposed client-side javascript within it. iirc, visual studio allow debug javascript code expected in internet explorer (and possibly edge), other browsers want use either third-party tool or developer tools (f12) within browser. an easy approach take advant...
Read more