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MILERR_DISPLAYID_ACCESS_DENIED
MILERR_DISPLAYID_ACCESS_DENIED is a Windows Media Integration Layer (MIL) HRESULT. It indicates that the caller is not allowed to access the bitmap associated with the specified display identifier.
What to check
- Check the display identifier, session, ownership, and security context used to request the bitmap.
- Verify that the display is still connected and accessible to the current interactive user session.
- Handle protected or restricted display content without trying to copy it through an unauthorized path.
Microsoft documentation about WPF hardware-accelerated rendering
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