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step command

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The step command steps the play one or more frames forward or reverse. The default action is to step forward one frame. Digital-video, VCR, and CAV-format videodisc devices recognize this command.

To send this command, call the mciSendString function with the lpszCommand parameter set as follows.

_stprintf_s(
  lpszCommand, 
  TEXT("step %s %s %s"), 
  lpszDeviceID, 
  lpszStepFlags, 
  lpszFlags
);

Parameters

lpszDeviceID

Identifier of an MCI device. This identifier or alias is assigned when the device is opened.

lpszStepFlags

One or both of the following flags.

Value Meaning
by frames Indicates the number of frames to step. If you specify a negative frames value, you cannot specify the "reverse" flag.
reverse Step the frames in reverse.

lpszFlags

Can be "wait", "notify", or both. For digital-video and VCR devices, "test" can also be specified. For more information about these flags, see The Wait, Notify, and Test Flags.

Return Value

Returns zero if successful or an error otherwise.

Requirements

Requirement Value
Minimum supported client
 Windows 2000 Professional [desktop apps only]
Minimum supported server
 Windows 2000 Server [desktop apps only]

See also

MCI

MCI Command Strings