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ICaptureGraphBuilder::AllocCapFile method (strmif.h)

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[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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.]

Note  The ICaptureGraphBuilder interface is deprecated. Use ICaptureGraphBuilder2 instead.
 
Preallocates a capture file to a specified size.

Syntax

HRESULT AllocCapFile(
  [in] LPCOLESTR lpstr,
  [in] DWORDLONG dwlSize
);

Parameters

[in] lpstr

Pointer to a wide-character string containing the name of the file to create or resize.

[in] dwlSize

Size, in bytes, of the file to be allocated.

Return value

Returns an HRESULT value.

Remarks

The call will fail if the file is read-only. For best capture results, always capture to a defragmented, preallocated capture file that is larger than the size of the capture data.

Requirements

Requirement Value
Target Platform Windows
Header strmif.h (include Dshow.h)

See also

Error and Success Codes

ICaptureGraphBuilder Interface