title: Unable to Open the Port
body: <blockquote>
    <p>I call library native function OpenSSPComPortUSB() while running 
    program get pop-up unbable to open the port \.\COM208. Why it return 
    \.\COM208 as I have pass PortNumber =7; below is the Java code and my
    goal is to open port COM7 to start the serial communication with smart
    hoper.</p>
  </blockquote>
  
  <pre><code>    //  AccessITLLib.java
  
  
     public class AccessITLLib
      {
  
  
         public static class SSP_COMMAND extends Structure
         {
             SSP_FULL_KEY Key;
              public NativeLong BaudRate;
              public byte PortNumber;
                      public NativeLong Timeout;
                      public byte SSPAddress;
                      public byte RetryLevel;
                      public byte EncryptionStatus;
                      public byte CommandDataLength;
                      public byte[] CommandData = new byte[255];
                      public byte ResponseStatus;
                      public byte ResponseDataLength;
                      public byte[] ResponseData = new byte[255];
                      public byte IgnoreError;
  
  
         }
  
  
  
         public interface ITLLib extends Library
         {
             ITLLib INSTANCE = (ITLLib) Native.loadLibrary("ITLSSPproc",
                     ITLLib.class);
  
             public int OpenSSPComPort(SSP_COMMAND p);
             public int OpenSSPComPortUSB(SSP_COMMAND p);
             public int CloseSSPComPort();
             public int CloseSSPComPortUSB();
         }
  
         public static void main(String[] args)
         {
            SSP_COMMAND commandStruct = new SSP_COMMAND();
            commandStruct.BaudRate = new NativeLong(9600);
            commandStruct.PortNumber =7;
            commandStruct.Timeout = 500;
            commandStruct.RetryLevel = 3;
            commandStruct.IgnoreError = 1;
            commandStruct.SSPAddress =16;
  
  
  
            ITLLib.INSTANCE.CloseSSPComPort();
            ITLLib.INSTANCE.CloseSSPComPortUSB();
            ITLLib.INSTANCE.OpenSSPComPort(commandStruct);
            ITLLib.INSTANCE.OpenSSPComPortUSB(commandStruct);
  
  
  
         }
      }
  
  
   here are the c structures
      typedef struct{
          SSP_FULL_KEY Key;
          unsigned long BaudRate;
          unsigned long Timeout;
          unsigned char PortNumber;
          unsigned char SSPAddress;
          unsigned char RetryLevel;
          unsigned char EncryptionStatus;
          unsigned char CommandDataLength;
          unsigned char CommandData[255];
          unsigned char ResponseStatus;
          unsigned char ResponseDataLength;
          unsigned char ResponseData[255];
          unsigned char IgnoreError;
      }SSP_COMMAND;
  
  
  
      typedef struct{
          unsigned long long FixedKey;
          unsigned long long EncryptKey;
      }SSP_FULL_KEY;
  </code></pre>