datacrush.info

If you need to perform modem dial-up from a Java program running in Windows, you have two choices: Learn port programming or use Windows built-in dialer.

This is how the Java code would look like:

Process prcHdl;
Runtime cmdHdl = Runtime.getRuntime();
String cmd = "rasdial myOffice myUser myPassword";

try {
.  prcHdl = cmdHdl.exec(cmd);
.  prcHdl.waitFor();
.  int prcExit = prcHdl.exitValue();

} catch (Exception ex) {};

Integer prcExit in the sample code above holds return code for the operation. Some of the return codes are:

• 000 - Successful.
• 600 - Operation pending.
• 615 - Port not found.
• 617 - Modem disconnecting.
• 628 - Connection was closed.
• 629 - Connection closed by remote computer.
• 630 - Hardware failure.
• 638 - Request timed out.

If you go to command prompt and type in “rasdial” you’ll get a brief description of passable arguments. It looks like this:

rasdial entryname [username [password|*]] [/DOMAIN:domain]
.       [/PHONE:phonenumber] [/CALLBACK:callbacknumber]
.       [/PHONEBOOK:phonebookfile] [/PREFIXSUFFIX]

The entryname comes from Windows dial-up connection that you can create under Network Connections.

To disconnect, you may execute something like this:

Process prcHdl;
Runtime cmdHdl = Runtime.getRuntime();
String cmd = "rasdial myOffice /disconnect";

try {
.  prcHdl = cmdHdl.exec(cmd);
.  prcHdl.waitFor();
.  int prcExit = prcHdl.exitValue();

} catch (Exception ex) {};

This is another blast from the past, one that never made it to production in China because there wasn’t a request from the customer and the project manager didn’t see the benefit of going an extra mile.