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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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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.]
Microsoft DirectShow provides several macros for validating pointers.
| Macro | Description |
|---|---|
| CheckPointer | Checks whether a pointer is NULL. |
| ValidateReadPtr | Verifies that the calling process has read access to a memory block. |
| ValidateReadWritePtr | Verifies that the calling process has read/write access to a memory block. |
| ValidateStringPtr | Verifies that the calling process has read access to a string. |
| ValidateStringPtrA | Verifies that the calling process has read access to an ANSI string. |
| ValidateStringPtrW | Verifies that the calling process has read access to a wide-character string. |
| ValidateWritePtr | Verifies that the calling process has write access to a memory block. |