To obtain the handle to WinDriver's kernel module (hWD) from the Kernel PlugIn, you can do one of the
following:
- Call WD_Open() directly from the
Kernel PlugIn.
NOTE: WD_UsbTransfer() is
part of WinDriver's old USB API, which was used until (and
including) version 5.2.2. The USB API from version 6.0.0 and above
cannot be used from the Kernel PlugIn. When calling one of the old
WinDriver USB APIs — such as WD_UsbTransfer() — from the Kernel PlugIn,
you must use this option — i.e., call WD_Open() directly in the kernel — in order
to get a handle to WinDriver that can be used in the Kernel PlugIn. You
cannot use the handle that is passed from the user mode (as suggested
in the second option below) with the WinDriver USB functions.
- For PCI/PCMCIA/ISA, you can also use the
hWD handle, which is passed from
the user mode via WD_KernelPlugInOpen(), and received as the second
argument of the Kernel PlugIn callback function KP_Open().
Alternatively, you can also pass the handle from the user mode to the
Kernel PlugIn using the pData
field of the WD_KERNEL_PLUGIN_CALL struct, which is used in the
call to WD_KernelPlugInCall() in
the user mode and results in a callback to KP_Call() in the Kernel PlugIn.
After obtaining the handle to WinDriver, the call to WD_Transfer() / WD_UsbTransfer() (or any other WinDriver API that receives
a handle to WinDriver as a parameter) is the same as in the user mode.
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