maybe it is easy when you run the function in a wdf device driver. but I have
a wdm driver, want to talk to wdf driver. how can I do that?

IoGetDeviceObjectPointer( &unicodeName, FILE_READ_ATTRIBUTES, &pFile,
&pDevice );
wdfFile = *((WDFFILEOBJECT *)pFile);
wdfDevice = WdfFileObjectGetDevice(wdfFile);

it can get the fileobject and device object when I know the wdf device
name-"unicodeName", and later I force the pointer to WDFFILEOBJCT, it tell
me access memory error.

first, WDF object handles, regardless of type, are only valid within the
driver which created them. as another driver talking to a WDF driver you do
not get access to these handles. WDF object handles cannot be casted from a
WDM structure. why do you want the other driver's WDFDEVICE?

d

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"Wllee" <Wllee@discussions.microsoft.com> wrote in message
news:53AB380D-3203-4244-A71A-A487FC9D90EB@microsoft.com...