IWDFDeviceInitialize::SetFilter method (wudfddi.h)

[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 SetFilter method sets the property that enables a device as a filter device.

Syntax

void SetFilter();

Return value

None

Remarks

A filter driver calls SetFilter to mark itself as a filter. When you tell the framework that your driver is a filter, the framework:

• Sends I/O requests for which the filter has not registered a callback to the next logical driver in the stack. For example, your filter driver provides an IQueueCallbackDeviceIoControl::OnDeviceIoControl method, but not IQueueCallbackRead::OnRead or IQueueCallbackWrite::OnWrite. As a result, your filter driver receives only device I/O control requests.
• Automatically forwards file create, cleanup, and close requests so your driver does not need to call the IWDFDeviceInitialize::AutoForwardCreateCleanupClose method.

Examples

For a code example of how to use the SetFilter method, see IWDFDriver::CreateDevice.

Requirements

See also

IWDFDeviceInitialize

IWDFDriver::CreateDevice