Intermec 6100 Reference Guide

R

This callback is called for each error and must return IDCANCEL (0x02),

IDRETRY (0x04) or 0.  If the application returns 0, the default handler proĆ

cesses the error.  For consistency, the application should handle all errors.

Use any method for displaying the message.  Make the dialog model, if posĆ

sible.  Note, based on the method of displaying the message, you may need

to translate the return values into IDCANCEL or IDRETRY for the printer

driver.

4. Perform normal printing operations.
5. Call PrtService to remove the error handler, using PRT_SETPROC

(0x0010) and a NULL value for the handler address.

6. Call PrtService to disable the driver, using PRT_DISABLE (0x0002).

The IrDA printer driver includes an API to provide access to the features of the

IrDA driver that are not available through the standard Windows API.

To use the API, the application must first obtain the entry point for the 

PrtSer-

vice

 procedure as described in the following code fragment:

hInstNorPrnt = LoadLibrary( “NORIRDA.DRV” );
if ( hInstNorPrnt <= HINSTANCE_ERROR ) {
  MessageBox( NULL, 
              “Could not open printer driver.”, 
              “ERROR”,
              MB_OK | MB_ICONEXCLAMATION );
  return FALSE;
}
lpfnPrtService = 
  (fpPrtService)GetProcAddress( hInstNorPrnt, “PrtService” );
if ( lpfnPrtService == NULL ) {
  MessageBox( NULL, 
              “Unable to get address for\nPrtService”, 
              “ERROR”, 
              MB_OK | MB_ICONEXCLAMATION );
  return FALSE;
}

NORIRDA.DRV contains an exported procedure 

PrtService(  HINSTANCE

hInst, WORD wOpt, LPARAM lParam1, LPARAM lParam2)

 that provides

the API for the driver.  The parameters to the procedure are as follows:

HINSTANCE hInst instance handle to our application.
WORD wOpt

option for action you want to perform.

LPARAM lParam1

double word that depends on the particular option.

LPARAM lParam2

double word that depends on the particular option.

The value returned by 

PrtService

 depends on the option selected.  See specific

options for more details.  The entry point can be called just like any Windows

procedure, as shown in the following fragment:

if (lpfnPrtService(hInst, PRT_ENABLE, (LPARAM)NULL,
                                  (LPARAM)NULL ) < 1) {

MessageBox( NULL, 

“Unable to enable printer driver”,
“ERROR”, 
MB_OK | MB_ICONEXCLAMATION );

return FALSE;

}