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4/8/2010

This method blocks until the next read requested through IAsyncReader::Requestcompletes or the time-out occurs.

Syntax 

HRESULT WaitForNext(
  DWORD 
dwTimeout,
  IMediaSample** 
ppSample,
  DWORD* 
pdwUser 
);

Parameters

dwTimeout

[in] Time-out in milliseconds; can be zero or INFINITE.

ppSample

[out] Completed sample.

pdwUser

User context.

Return Value

Returns an HRESULTvalue that depends on the implementation of the interface. Current DirectShow implementation return values include the following.

Value Description

VFW_E_TIMEOUT

A time-out has expired.

VFW_E_WRONG_STATE

The operation could not be performed because the filter is in the wrong state.

E_FAIL

Failure.

S_OK

Success.

Remarks

Samples may not be returned in order. If there is a read error of any sort, a notification will already have been sent by the source filter, and HRESULTwill be an error. If ppSampleis not null, a request has been completed with the result code returned.

The pdwUserparameter returns the caller's context DWORDcorresponding to the sample returned.

Requirements

Windows Embedded CE Windows CE 2.12 and later
Windows Mobile Windows Mobile Version 5.0 and later
Note Microsoft DirectShow applications and DirectShow filters have different include file and Library requirements
For more information, see Setting Up the Build Environment,
Version 2.12 requires DXPAK 1.0 or later