IWDFDevice2::CreateRemoteInterface method (wudfddi.h)

Artikel
02/22/2024

[Warning: UMDF 2 is the latest version of UMDF and supersedes UMDF 1. All new UMDF drivers should be written using UMDF 2. No new features are being added to UMDF 1 and there is limited support for UMDF 1 on newer versions of Windows 10. Universal Windows drivers must use UMDF 2. For more info, see Getting Started with UMDF.]

The CreateRemoteInterface method creates a remote interface object that represents a device interface.

Syntax

HRESULT CreateRemoteInterface(
  [in]           IWDFRemoteInterfaceInitialize *pRemoteInterfaceInit,
  [in, optional] IUnknown                      *pCallbackInterface,
  [out]          IWDFRemoteInterface           **ppRemoteInterface
);

Parameters

[in] pRemoteInterfaceInit

A pointer to an IWDFRemoteInterfaceInitialize interface that the driver's IPnpCallbackRemoteInterfaceNotification::OnRemoteInterfaceArrival callback function received.

[in, optional] pCallbackInterface

A pointer to an optional, driver-supplied callback interface. The IUnknown::QueryInterface method of this interface must return a pointer to the driver's IRemoteInterfaceCallbackEvent and IRemoteInterfaceCallbackRemoval interfaces, if the driver supports those interfaces. This parameter is optional and can be NULL.

[out] ppRemoteInterface

A pointer to a driver-supplied location that receives a pointer to the IWDFRemoteInterface interface of the new remote interface object.

Return value

CreateRemoteInterface returns S_OK if the operation succeeds. Otherwise, the method might return the following value:

Return code	Description
E_OUTOFMEMORY	The framework's attempt to allocate memory failed.

This method might return one of the other values that Winerror.h contains.

Remarks

If your driver calls CreateRemoteInterface, it must do so from within its IPnpCallbackRemoteInterfaceNotification::OnRemoteInterfaceArrival callback function.

For more information about CreateRemoteInterface and using device interfaces, see Using Device Interfaces in UMDF-based Drivers

Examples

The following code example shows an IPnpCallbackRemoteInterfaceNotification::OnRemoteInterfaceArrival callback function that creates a remote interface object, creates a remote target object, and opens the remote target for I/O operations.

void 
STDMETHODCALLTYPE
CMyDevice::OnRemoteInterfaceArrival(
    __in IWDFRemoteInterfaceInitialize * FxRemoteInterfaceInit
    )
{
    HRESULT hr = S_OK;

    //
    // Create a new remote interface object and provide a callback 
    // object to handle remote interface events.
    //
    CComPtr<IWDFRemoteInterface> fxRemoteInterface;
    hr = m_FxDevice->CreateRemoteInterface(FxRemoteInterfaceInit, 
                                           MyRemoteInterfaceIUnknown, 
                                           &fxRemoteInterface);
    if (FAILED(hr)) goto Error;
    //
    // Create a new remote target object and provide a callback 
    // object to handle remote target events.
    //
    CComPtr<IWDFRemoteTarget> fxTarget;
    hr = m_FxDevice->CreateRemoteTarget(MyRemoteTargetIUnknown,
                                        fxRemoteInterface,
                                        &fxTarget);
    if (FAILED(hr)) goto Error;

    //
    // Open the remote interface with read/write access.
    //
    hr = FxTarget->OpenRemoteInterface(fxRemoteInterface, 
                                       NULL,
                                       GENERIC_READ | GENERIC_WRITE,
                                       NULL);
    if (FAILED(hr)) goto Error;
...
}

Requirements

Requirement	Value
End of support	Unavailable in UMDF 2.0 and later.
Target Platform	Desktop
Minimum UMDF version	1.9
Header	wudfddi.h (include Wudfddi.h)
DLL	WUDFx.dll

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