Intermec 6200 Reference Guide

R

3. Call PrtService to register the new handler using PRT_SETPROC (0x0010)

and the address of the new handler.  The new handler should have the

following prototype:

extern “C” WORD _export FAR PASCAL ShowPrtError(WORD wCurErr)

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 the erĆ

rors.  You can use any method for displaying the message you want.  It is

best to make your dialog model if possible.  Remember that, depending on

the method of displaying the message, you may need to translate the return

values into 

IDCANCEL

 or 

IDRETRY

 so the printer driver knows how to deal

with it.  For the various error conditions that can occur, see the Error Codes

and Messages topic, on page 3Ć35.

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)

.

See the following Printer Services API topic for more information about available

printer services.

The NPCP printer driver includes an Applications Program Interface (API) to

provide access to the features of the NPCP driver that are not available through

the standard Windows API.

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

PrtService procedure as described in the following code fragment:

hInstNorPrnt = LoadLibrary( “NORNPCP.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;
}