IVMRMonitorConfig9::GetAvailableMonitors method (vmr9.h)

项目
4/26/2023

[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 GetAvailableMonitors method retrieves information about the monitors currently available on the system.

Syntax

HRESULT GetAvailableMonitors(
  [out] VMR9MonitorInfo *pInfo,
  [in]  DWORD           dwMaxInfoArraySize,
  [out] DWORD           *pdwNumDevices
);

Parameters

[out] pInfo

Pointer to an array of VMR9MonitorInfo structures that contain information about each monitor on the system.

[in] dwMaxInfoArraySize

Specifies the maximum number of members in the array.

[out] pdwNumDevices

If pInfo is NULL, this parameter receives the required array size. Otherwise, it receives the actual number of devices retrieved.

Return value

The method returns an HRESULT. Possible values include the following.

Return code	Description
E_INVALIDARG	Invalid argument; dwMaxInfoArraySize must be greater than zero.
E_POINTER	NULL pointer argument.
S_OK	The method succeeded.

Remarks

Use this method to get a list of Direct Draw device identifiers and their associated monitor information that the mixer can use when connecting to an upstream decoder filter.

Include DShow.h and D3d9.h before Vmr9.h.

Requirements

Requirement	Value
Minimum supported client	Windows XP with SP2 [desktop apps only]
Minimum supported server	Windows Server 2003 R2 [desktop apps only]
Target Platform	Windows
Header	vmr9.h
Library	Strmiids.lib

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