C++ (Cpp) WdfObjectCreate Examples

Example #1

File: hardwaresimulator.cpp Project: 340211173/Windows-driver-samples

// This static routine performs simulator initialization. The routine creates a 
// timer object that periodically updates the m_Index location 
NTSTATUS
HardwareSimulator::Initialize(
    _In_ WDFDEVICE Device,               // WDF device representing the sensor
    _Out_ WDFOBJECT *SimulatorInstance)   // Instance of the WDF object for the simulator
{
    PHardwareSimulator pSimulator = nullptr;
    NTSTATUS Status = STATUS_SUCCESS;
    WDF_OBJECT_ATTRIBUTES HardwareSimulatorAttributes = {};

    SENSOR_FunctionEnter();

    // Create WDFOBJECT for the hardware simulator
    WDF_OBJECT_ATTRIBUTES_INIT_CONTEXT_TYPE(&HardwareSimulatorAttributes, HardwareSimulator);
    HardwareSimulatorAttributes.ParentObject = Device;

    Status = WdfObjectCreate(&HardwareSimulatorAttributes, SimulatorInstance);
    if (!NT_SUCCESS(Status))
    {
        TraceError("CSTM %!FUNC! WdfObjectCreate failed %!STATUS!", Status);
        goto Exit;
    }

    pSimulator = GetHardwareSimulatorContextFromInstance(*SimulatorInstance);
    if (nullptr == pSimulator)
    {
        Status = STATUS_INSUFFICIENT_RESOURCES;
        TraceError("CSTM %!FUNC! GetHardwareSimulatorContextFromInstance failed %!STATUS!", Status);
        goto Exit;
    }

    pSimulator->InitializeInternal(*SimulatorInstance);

Exit:

    SENSOR_FunctionExit(Status);

    return Status;
}

Example #2

File: connection.c Project: 0xhack/Windows-driver-samples

NTSTATUS
BthEchoConnectionObjectCreate(
    _In_ PBTHECHOSAMPLE_DEVICE_CONTEXT_HEADER DevCtxHdr,
    _In_ WDFOBJECT ParentObject,
    _Out_ WDFOBJECT*  ConnectionObject
    )
/*++

Description:

    This routine creates a connection object.
    This is called by client and server when a remote connection
    is made.

Arguments:

    DevCtxHdr - Device context header
    ParentObject - Parent object for connection object
    ConnectionObject - receives the created connection object

Return Value:

    NTSTATUS Status code.

--*/
{
    NTSTATUS status;
    WDF_OBJECT_ATTRIBUTES attributes;
    WDFOBJECT connectionObject = NULL;

    WDF_OBJECT_ATTRIBUTES_INIT_CONTEXT_TYPE(&attributes, BTHECHO_CONNECTION);
    attributes.ParentObject = ParentObject;    
    attributes.EvtCleanupCallback = BthEchoEvtConnectionObjectCleanup;

    //
    // We set execution level to passive so that we get cleanup at passive
    // level where we can wait for continuous readers to run down
    // and for completion of disconnect
    //
    attributes.ExecutionLevel = WdfExecutionLevelPassive; 

    status = WdfObjectCreate(
        &attributes,
        &connectionObject
        );

    if (!NT_SUCCESS(status))
    {
        TraceEvents(TRACE_LEVEL_ERROR, DBG_CONNECT, 
            "WdfObjectCreate for connection object failed, Status code %!STATUS!\n", status);
        
        goto exit;
    }

    status = BthEchoConnectionObjectInit(connectionObject, DevCtxHdr);

    if (!NT_SUCCESS(status))
    {
        TraceEvents(TRACE_LEVEL_ERROR, DBG_CONNECT, 
            "Context initialize for connection object failed, ConnectionObject 0x%p, Status code %!STATUS!\n",
            connectionObject,
            status
            );

        goto exit;
    }

    *ConnectionObject = connectionObject;
    
exit:
    if(!NT_SUCCESS(status) && connectionObject)
    {
        WdfObjectDelete(connectionObject);
    }
    
    return status;
}