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| + | http://www.textraccale.com |
| | + | This code snippet shows how to retrieve the available comms ports on your computer. A CommPort is available if it is not being used by another application. Note the difference between the two examples is that the version for JDK 5.0 up uses [http://java.sun.com/j2se/1.5.0/docs/guide/language/generics.html generics]: |
| | + | |
| | + | <b>JDK <= 1.4</b> |
| | + | <pre> |
| | + | /** |
| | + | * @return A HashSet containing the CommPortIdentifier for all serial ports that are not currently being used. |
| | + | */ |
| | + | public static HashSet getAvailableSerialPorts() { |
| | + | HashSet h = new HashSet(); |
| | + | Enumeration thePorts = CommPortIdentifier.getPortIdentifiers(); |
| | + | while (thePorts.hasMoreElements()) { |
| | + | CommPortIdentifier com = (CommPortIdentifier) thePorts.nextElement(); |
| | + | switch (com.getPortType()) { |
| | + | case CommPortIdentifier.PORT_SERIAL: |
| | + | try { |
| | + | CommPort thePort = com.open("CommUtil", 50); |
| | + | thePort.close(); |
| | + | h.add(com); |
| | + | } catch (PortInUseException e) { |
| | + | System.out.println("Port, " + com.getName() + ", is in use."); |
| | + | } catch (Exception e) { |
| | + | System.err.println("Failed to open port " + com.getName()); |
| | + | e.printStackTrace(); |
| | + | } |
| | + | } |
| | + | } |
| | + | return h; |
| | + | } |
| | + | </pre> |
| | + | |
| | + | <b>JDK >= 5.0</b> |
| | + | <pre> |
| | + | /** |
| | + | * @return A HashSet containing the CommPortIdentifier for all serial ports that are not currently being used. |
| | + | */ |
| | + | public static HashSet<CommPortIdentifier> getAvailableSerialPorts() { |
| | + | HashSet<CommPortIdentifier> h = new HashSet<CommPortIdentifier>(); |
| | + | Enumeration thePorts = CommPortIdentifier.getPortIdentifiers(); |
| | + | while (thePorts.hasMoreElements()) { |
| | + | CommPortIdentifier com = (CommPortIdentifier) thePorts.nextElement(); |
| | + | switch (com.getPortType()) { |
| | + | case CommPortIdentifier.PORT_SERIAL: |
| | + | try { |
| | + | CommPort thePort = com.open("CommUtil", 50); |
| | + | thePort.close(); |
| | + | h.add(com); |
| | + | } catch (PortInUseException e) { |
| | + | System.out.println("Port, " + com.getName() + ", is in use."); |
| | + | } catch (Exception e) { |
| | + | System.err.println("Failed to open port " + com.getName()); |
| | + | e.printStackTrace(); |
| | + | } |
| | + | } |
| | + | } |
| | + | return h; |
| | + | } |
| | + | </pre> |
Latest revision as of 01:23, 10 July 2009
http://www.textraccale.com
This code snippet shows how to retrieve the available comms ports on your computer. A CommPort is available if it is not being used by another application. Note the difference between the two examples is that the version for JDK 5.0 up uses generics:
JDK <= 1.4
/**
* @return A HashSet containing the CommPortIdentifier for all serial ports that are not currently being used.
*/
public static HashSet getAvailableSerialPorts() {
HashSet h = new HashSet();
Enumeration thePorts = CommPortIdentifier.getPortIdentifiers();
while (thePorts.hasMoreElements()) {
CommPortIdentifier com = (CommPortIdentifier) thePorts.nextElement();
switch (com.getPortType()) {
case CommPortIdentifier.PORT_SERIAL:
try {
CommPort thePort = com.open("CommUtil", 50);
thePort.close();
h.add(com);
} catch (PortInUseException e) {
System.out.println("Port, " + com.getName() + ", is in use.");
} catch (Exception e) {
System.err.println("Failed to open port " + com.getName());
e.printStackTrace();
}
}
}
return h;
}
JDK >= 5.0
/**
* @return A HashSet containing the CommPortIdentifier for all serial ports that are not currently being used.
*/
public static HashSet<CommPortIdentifier> getAvailableSerialPorts() {
HashSet<CommPortIdentifier> h = new HashSet<CommPortIdentifier>();
Enumeration thePorts = CommPortIdentifier.getPortIdentifiers();
while (thePorts.hasMoreElements()) {
CommPortIdentifier com = (CommPortIdentifier) thePorts.nextElement();
switch (com.getPortType()) {
case CommPortIdentifier.PORT_SERIAL:
try {
CommPort thePort = com.open("CommUtil", 50);
thePort.close();
h.add(com);
} catch (PortInUseException e) {
System.out.println("Port, " + com.getName() + ", is in use.");
} catch (Exception e) {
System.err.println("Failed to open port " + com.getName());
e.printStackTrace();
}
}
}
return h;
}
