IMSVidPlayback::get_CanStep method (segment.h)
[The feature associated with this page, Microsoft TV Technologies, is a legacy feature. Microsoft strongly recommends that new code does not use this feature.]
The get_CanStep method queries whether the input source can step frame by frame.
Syntax
HRESULT get_CanStep(
[in] VARIANT_BOOL fBackwards,
[out] VARIANT_BOOL *pfCan
);
Parameters
[in] fBackwards
Use one of the following values.
Value | Description |
---|---|
VARIANT_FALSE | Query whether the input can step forward |
VARIANT_TRUE | Query whether the input can step backward. |
[out] pfCan
Pointer to a variable that receives one of the following values.
Value | Description |
---|---|
VARIANT_FALSE | The source cannot step in the specified direction. |
VARIANT_TRUE | The source can step in the specified direction. |
Return value
The method returns an HRESULT. Possible values include the following.
Return code | Description |
---|---|
|
NULL pointer argument. |
|
The graph is not built. Call the Build or View method on the Video Control. |
|
The method succeeded. |
Note��The value ERROR_INVALID_STATE is converted to an HRESULT with the HRESULT_FROM_WIN32 macro.
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Remarks
Call the IMSVidCtl::Build or IMSVidCtl::View method before calling this method.
Examples
VARIANT_BOOL fCan = VARIANT_FALSE;
hr = m_pPlayback->get_CanStep(VARIANT_FALSE, &fCan);
Requirements
Requirement | Value |
---|---|
Minimum supported client | Windows�XP [desktop apps only] |
Minimum supported server | None supported |
Target Platform | Windows |
Header | segment.h (include Msvidctl.h) |