IAMResourceControl::Reserve method (strmif.h)

Article
07/27/2023

[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The Reserve method reserves or unreserves a device resource.

Syntax

HRESULT Reserve(
  [in] DWORD dwFlags,
  [in] PVOID pvReserved
);

Parameters

[in] dwFlags

Flag indicating whether to reserve or unreserve this device. The value must be a member of the AMRESCTL_RESERVEFLAGS enumeration.

[in] pvReserved

Must be NULL.

Return value

Returns S_OK if the device was successfully reserved or unreserved, S_FALSE if the device is currently reserved and will continue to be held, or an HRESULT error code if the device can't be reserved.

Remarks

A resource can be reserved multiple times. If the method returns S_OK, the filter increments an internal reserve count. For every call to reserve a device that returns S_OK, the caller must make a matching call to unreserve the device.

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Target Platform	Windows
Header	strmif.h (include Dshow.h)
Library	Strmiids.lib

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