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875天前import java.io.*; |
import java.util.*; |
import javax.comm.*; |
public class SimpleLPTPort { |
Enumeration ports; |
CommPortIdentifier portId; |
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ParallelPort LPTPort; |
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protected OutputStream out; |
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String outPrintStr = "When an \n\rinput method \n\ris activated, "; |
public SimpleLPTPort() { |
checkLPTPort(); |
} |
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public void checkLPTPort() { |
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ports = CommPortIdentifier.getPortIdentifiers(); |
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if (ports == null) { |
System.out.println("No comm ports found!"); |
System.exit(0); |
} |
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while (ports.hasMoreElements()) { |
// Get the specific port |
portId = (CommPortIdentifier)ports.nextElement(); |
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// Is this a parallel port? |
if (portId.getPortType() == CommPortIdentifier.PORT_PARALLEL) { |
// Is the port in use? |
if (portId.isCurrentlyOwned()) { |
System.out.println("Detected " |
+ portId.getName() |
+ " in use by " |
+ portId.getCurrentOwner()); |
} |
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// Try to open the port. |
try { |
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try { |
//for(int i = 0; i <=2; i++) { |
LPTPort = (ParallelPort)portId.open("ParallelPort", 2000); |
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System.out.println(LPTPort.getName() + " a LPT port is opened."); |
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if (LPTPort == null) { |
System.out.println("Error opening LPT port " |
+ LPTPort.getName()); |
} |
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// Get the output stream |
try |
{ |
out = LPTPort.getOutputStream(); |
} |
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catch (IOException e) |
{ |
System.out.println("Cannot open output stream"); |
} |
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out.write(outPrintStr.getBytes()); |
System.out.println(outPrintStr.getBytes()); |
LPTPort.close(); |
System.out.println(LPTPort.getName() + " is closing."); |
//} |
System.out.println("Output stream complete."); |
//LPTPort.close(); |
System.exit(0); |
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} catch (IOException ex) { |
System.out.println("Output stream fail."); |
System.out.println(LPTPort.getName() |
+ ": Cannot write to output stream"); |
LPTPort.close(); |
System.exit(0); |
} |
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} catch (PortInUseException e) { |
System.out.println("Queueing open for " |
+ portId.getName() |
+ ": port in use by " |
+ e.currentOwner); |
} |
} |
} |
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} |
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public static void main(String[] args) { |
new SimpleLPTPort(); |
} |
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} |
