Opening the Pen Driver

Before sending a driver a message, an application must first obtain a handle to the driver with the Windows OpenDriver function. The following code demonstrates this:

HDRVR hDrvPen;

.

.

.

hDrvPen = OpenDriver( "pen", NULL, NULL );

if( hDrvPen == NULL )

{

// The pen driver does not exist.

// Either display an error message and exit,

// or continue to function as a pen-unaware application.

}

As an example of how to send the driver messages, the following code uses the pen driver message DRV_SetPenSamplingRate to set the sampling rate to 200 points per second. A later segment of code then queries the driver to get relevant pen infor-mation.

WORD wOldRate;

wOldRate = SendDriverMessage( hDrvPen, // Driver handle

DRV_SetPenSamplingRate, // Message

200, // New rate in Hz

NULL ); // Not applicable

.

.

.

// Get information about the pen driver

PENINFO pi;

BOOL PenHardwareExists;

fPenHardwareExists = SendDriverMessage( hDrvPen,

DRV_GetPenInfo,

(DWORD)(LPPENINFO)&pi,

NULL );

When finished, an application must close the handle to the installable driver with the CloseDriver function, as shown here:

CloseDriver( hDrvPen, NULL, NULL );

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