Microsoft KB Archive/94012

= Visual Basic MCI Control TimeFormat Property Information =

Article ID: 94012

Article Last Modified on 2/23/2007

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APPLIES TO


 * Microsoft Windows 2000 Readiness Analyzer
 * Microsoft Visual Basic 2.0 Professional Edition

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This article was previously published under Q94012



SUMMARY
The Multimedia Device Control (MCI.VBX) TimeFormat property does not support all format settings with all device types. When you assign a value to TimeFormat that is not supported by the device, the TimeFormat retains its previous setting.

This article also describes MCI_FORMAT_MSF (2) and shows how to separate the four bytes of a time value.



MORE INFORMATION
To determine if the current device supports a particular TimeFormat setting, assign the value to TimeFormat. Then check TimeFormat to see if it returns the value assigned. For example: For i = 0 To 10 MMControl1.TimeFormat = i     If MMControl1.TimeFormat = i Then MsgBox Format$(i) + &quot; supported&quot; Else MsgBox Format$(i) + &quot; not supported&quot; End If  Next Some of the time formats, such as MCI_FORMAT_TMSF, provide four separate byte size numbers packed into one four byte long integer. The following sample statements show how you can extract the four bytes into separate variables: byte1 = MMControl1.Position And       &HFF& byte2 = (MMControl1.Position And    &HFF00&) \     &H100 byte3 = (MMControl1.Position And  &HFF0000)  \   &H10000 byte4 = (MMControl1.Position And &H7F000000) \ &H1000000 If (MMControl1.Position And &H80000000) <> 0 Then ' put sign bit back into byte4 byte4 = byte4 + &H80 End If The least significant byte is stored in byte1 and the most significant byte is stored in byte4.

The following list shows all possible settings for TimeFormat:

0 MCI_FORMAT_MILLISECONDS

1 MCI_FORMAT_HMS

2 MCI_FORMAT_MSF

3 MCI_FORMAT_FRAMES

4 MCI_FORMAT_SMPTE_24

5 MCI_FORMAT_SMPTE_25

6 MCI_FORMAT_SMPTE_30

7 MCI_FORMAT_SMPTE_30DROP

8 MCI_FORMAT_BYTES

9 MCI_FORMAT_SAMPLES

10 MCI_FORMAT_TMSF

The TimeFormat setting MCI_FORMAT_MSF is described in the README.TXT file but is missing from the &quot;Microsoft Visual Basic Professional Features Custom Control Reference&quot; for version 2.0. The following description of MCI_FORMAT_MSF appears in the README.TXT file:

2 MCI_FORMAT_MSF Minutes, seconds, and frames are packed into a

four-byte integer. From least significant byte to

most significant byte, the individual data values

follow:

Minutes (least significant byte)

Seconds

Frames

Unused (most significant byte)

The TimeFormat property affects the following properties.

Position

From

To

Start

Length

TrackLength

TrackPosition

Microsoft has confirmed that this information should be included in the &quot;Microsoft Visual Basic Professional Features Custom Control Reference&quot; for version 2.0. We will post new information here when the documentation has been updated with this additional information.

Additional query words: 1.00 2.00 kbdocerr

Keywords: KB94012

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