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