This topic documents a feature of Visual Filters and Transitions, which is deprecated as of Windows Internet Explorer 9 and obsolete as of Internet Explorer 10.
The IDXDCLock interface is used to lock a surface and to obtain a device context (DC) that can be used with Windows Graphics Device Interface (GDI) calls.
GetDC Retrieves the current DC.
You can use IDXDCLock by calling the IDXSurface::LockSurface method and by specifying IID_IDXDCLock as the desired interface, or by calling the IDXSurface::LockSurfaceDC method. When the IDXDCLock interface is finally released, the underlying GDI DC is released.
IDXDCLock can be used by any transform that enables you to specify the desired output bounds.
Stock Implementation dxtrans.dll Custom Implementation No Inherits from IUnknown Header and IDL files dxtrans.h, dxtrans.idl Minimum availability Internet Explorer 4.0 Minimum operating systems Windows 95, Windows NT 4.0