CImageAllocator.Alloc method
[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 Alloc method allocates memory for the buffers. This method overrides the CBaseAllocator::Alloc method.
Syntax
HRESULT Alloc();
Parameters
This method has no parameters.
Return value
Returns an HRESULT value. Possible values include the following.
| Return code | Description |
|---|---|
|
Success |
|
Insufficient memory |
Remarks
This method is called by the CBaseAllocator::Commit method, when the filter commits the allocator.
This method creates a list of media samples, which are implemented as CImageSample objects. Each sample contains a GDI device-independent bitmap, using the GDI CreateDIBSection function.
Internally this method calls CImageAllocator::CreateDIB to create each DIB, and CImageAllocator::CreateImageSample to create each sample.
Requirements
| Requirement | Value |
|---|---|
| Header |
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| Library |
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