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Retrieve the length of a media file (WAV, AVI, MIDI)

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You can retrieve the length of a standard windows media file (WAV, AVI or MIDI) using simple MCI functions. First, you must open the file with:

Click here to copy the following block
Declare Function mciSendString Lib "winmm" Alias "mciSendStringA" (ByVal _
  lpstrCommand As String, ByVal lpstrReturnString As String, _
  ByVal uReturnLength As Long, ByVal hwndCallback As Long) As Long

CommandString = "Open " & FileName" & " alias MediaFile"
mciSendString CommandString, vbNullString, 0, 0&

where MediaFile is an arbitrary name (an alias) that you then use in subsequent command strings. FileName is the full path of the media file and must be in the short format 8+3 characters. Now you can get file length in milliseconds:

Click here to copy the following block
Dim MediaLength as Long
Dim RetString As String * 256
Dim CommandString As String

CommandString = "Set MediaFile time format milliseconds"
mciSendString CommandString, vbNullString, 0, 0&
CommandString = "Status MediaFile length"
MciSendString CommandString, RetString, Len(RetString), 0&
MediaLength = CLng(RetString)

Now, the MediaLength variable containes the length of the media file. You only have to close the MCI device, with

Click here to copy the following block
CommandString = "Close MediaFile"
MciSendString CommandString, vbNullString, 0, 0&


Submitted By : Nayan Patel  (Member Since : 5/26/2004 12:23:06 PM)

Job Description : He is the moderator of this site and currently working as an independent consultant. He works with VB.net/ASP.net, SQL Server and other MS technologies. He is MCSD.net, MCDBA and MCSE. In his free time he likes to watch funny movies and doing oil painting.
View all (893) submissions by this author  (Birth Date : 7/14/1981 )


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