WDF-newbie: Sharing memory between application and driver?

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I'm porting an old driver from Compuware Driver::Works to WDF.
I need to share memory between application and my driver.

Problem 1:
My application manages larges buffers. The driver should read/write
data to the application buffer directly. No FileRead/FileWrite ... data access is not sequentiell.

So I pass a buffer pointer to the driver via an IoCtl.
How do I lock/map this buffer so the driver can access it savely?

Problem 2:
My driver allocates kernel memory with ExAllocatePoolWithTag.
The Application issues an IoCtl and wants to receive a pointer to the memory.
How do I map the result of WdfMemoryGetBuffer to user process space?


Any Wdf-Examples would be helpful.


Thanks
.

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