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Opens
the RapidLpt.sys kernel mode WDM device driver under Windows
2000/XP, providing direct access to the LPT hardware.
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Language
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Description
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C/C++
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HANDLE OpenRapidLpt ( ULONG DeviceInstance )
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Delphi
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function OpenRapidLpt ( DeviceInstance : Longword) : THandle; stdcall
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VB
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Function OpenRapidLpt ( ByVal DeviceInstance As Long) As Long
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Parameters:
DeviceInstance - LPT device instance.
Return Value:
The RapidLpt handle value or NULL if fails. Keep this handle opened all time when you are working with RapidLpt functions and close by CloseRapidLpt() at end of application.
Comments:
If the driver was successfully opened, the IsRapidLptOpened() returns True; if the function fails, the IsRapidLptOpened() returns False.
With RapidLpt you can support as many LPT devices as you want. To select the device you need change DriverInstance value from 0 up to maximal number of LPT device installed with RapidLpt driver. For the first application use
hLpt = OpenRapidLpt(0);
For second:
hLpt = OpenRapidLpt(1);
and so on.
See also: CloseRapidLpt IsRapidLptOpened
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