Intermec 6200 Reference Guide

R

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( “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;
}