IWDFObject::RetrieveContext 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 RetrieveContext method retrieves a context that was previously registered through the IWDFObject::AssignContext method.
Syntax
HRESULT RetrieveContext(
[out] void **ppvContext
);
Parameters
[out] ppvContext
A pointer to a buffer that receives a pointer to the previously registered context.
Return value
RetrieveContext returns S_OK if the operation succeeds. Otherwise, this method returns one of the error codes that are defined in Winerror.h.
Remarks
Because the context is not a Component Object Model (COM) interface, the driver must not treat the context as such. For example, the driver cannot call the AddRef method on the context.
Examples
For a code example of how to use the RetrieveContext method, see IWDFIoQueue::GetDevice.
Requirements
| Requirement | Value |
|---|---|
| End of support | Unavailable in UMDF 2.0 and later. |
| Target Platform | Desktop |
| Minimum UMDF version | 1.5 |
| Header | wudfddi.h (include Wudfddi.h) |
| DLL | WUDFx.dll |