Audio recorder on visual basic (стр. 2 из 2)

Private Declare Function GetShortPathName Lib "kernel32" _

Alias "GetShortPathNameA" (ByVal lpszLongPath As String, _

ByVal lpszShortPath As String, ByVal cchBuffer As Long) As Long

Private Declare Function FindFirstFile& Lib "kernel32" _

Alias "FindFirstFileA" (ByVal lpFileName As String, lpFindFileData _

As WIN32_FIND_DATA)

Private Declare Function FindClose Lib "kernel32" _

(ByVal hFindFile As Long) As Long

Private Const MAX_PATH = 260

Private Type FILETIME ' 8 Bytes

dwLowDateTime As Long

dwHighDateTime As Long

End Type

Private Type WIN32_FIND_DATA ' 318 Bytes

dwFileAttributes As Long

ftCreationTime As FILETIME

ftLastAccessTime As FILETIME

ftLastWriteTime As FILETIME

nFileSizeHigh As Long

nFileSizeLow As Long

dwReservedЇ As Long

dwReserved1 As Long

cFileName As String * MAX_PATH

cAlternate As String * 14

End Type

Private Function FileExist (strFileName As String) As Boolean

Dim lpFindFileData As WIN32_FIND_DATA

Dim hFindFirst As Long

hFindFirst = FindFirstFile (strFileName, lpFindFileData)

If hFindFirst > 0 Then

FindClose hFindFirst

FileExist = True

Else

FileExist = False

End If

End Function

Public Function GetShortName (ByVal sLongFileName As String) As String

Dim lRetVal As Long, sShortPathName As String, iLen As Integer

'Set up buffer area for API function call return

sShortPathName = Space (255)

iLen = Len (sShortPathName)

'Call the function

lRetVal = GetShortPathName (sLongFileName, sShortPathName, iLen)

If lRetVal = 0 Then 'The file does not exist, first create it!

Open sLongFileName For Random As #1

Close #1

lRetVal = GetShortPathName (sLongFileName, sShortPathName, iLen)

'Now another try!

Kill (sLongFileName)

'Delete file now!

End If

'Strip away unwanted characters.

GetShortName = Left (sShortPathName, lRetVal)

End Function

Private Function Has_Space (sName As String) As Boolean

Dim b As Boolean

Dim i As Long

b = False 'not yet any spaces found

i = InStr (sName, " ")

If i <> 0 Then b = True

Has_Space = b

End Function

Public Sub WaveReset ()

Dim rtn As String

Dim i As Long

rtn = Space$ (260)

'Close any MCI operations from previous VB programs

i = mciSendString ("close all", rtn, Len (rtn), 0)

If i <> 0 Then MsgBox ("Closing all MCI operations failed!")

'Open a new WAV with MCI Command...

i = mciSendString ("open new type waveaudio alias capture", rtn, Len (rtn), 0)

If i <> 0 Then MsgBox ("Opening new wave failed!")

End Sub

Public Sub WaveSet ()

Dim rtn As String

Dim i As Long

Dim settings As String

Dim Alignment As Integer

rtn = Space$ (260)

Alignment = Channels * Resolution / 8

settings = "set capture alignment " & CStr (Alignment) & " bitspersample " & CStr (Resolution) & " samplespersec " & CStr (Rate) & " channels " & CStr (Channels) & " bytespersec " & CStr (Alignment * Rate)

'Samples Per Second that are supported:

'11025 low quality

'22050 medium quality

'44100 high quality (CD music quality)

'Bits per sample is 16 or 8

'Channels are 1 (mono) or 2 (stereo)

i = mciSendString ("seek capture to start", rtn, Len (rtn), 0) 'Always start at the beginning

If i <> 0 Then MsgBox ("Starting recording failed!")

'You can use at least the following combinations

' i = mciSendString ("set capture alignment 4 bitspersample 16 samplespersec 44100 channels 2 bytespersec 176400", rtn, Len (rtn), 0)

' i = mciSendString ("set capture alignment 2 bitspersample 16 samplespersec 44100 channels 1 bytespersec 88200", rtn, Len (rtn), 0)

' i = mciSendString ("set capture alignment 4 bitspersample 16 samplespersec 22050 channels 2 bytespersec 88200", rtn, Len (rtn), 0)

' i = mciSendString ("set capture alignment 2 bitspersample 16 samplespersec 22050 channels 1 bytespersec 44100", rtn, Len (rtn), 0)

' i = mciSendString ("set capture alignment 4 bitspersample 16 samplespersec 11025 channels 2 bytespersec 44100", rtn, Len (rtn), 0)

' i = mciSendString ("set capture alignment 2 bitspersample 16 samplespersec 11025 channels 1 bytespersec 22050", rtn, Len (rtn), 0)

' i = mciSendString ("set capture alignment 2 bitspersample 8 samplespersec 11025 channels 2 bytespersec 22050", rtn, Len (rtn), 0)

' i = mciSendString ("set capture alignment 1 bitspersample 8 samplespersec 11025 channels 1 bytespersec 11025", rtn, Len (rtn), 0)

' i = mciSendString ("set capture alignment 2 bitspersample 8 samplespersec 8000 channels 2 bytespersec 16000", rtn, Len (rtn), 0)

' i = mciSendString ("set capture alignment 1 bitspersample 8 samplespersec 8000 channels 1 bytespersec 8000", rtn, Len (rtn), 0)

' i = mciSendString ("set capture alignment 2 bitspersample 8 samplespersec 6000 channels 2 bytespersec 12000", rtn, Len (rtn), 0)

' i = mciSendString ("set capture alignment 1 bitspersample 8 samplespersec 6000 channels 1 bytespersec 6000", rtn, Len (rtn), 0)

i = mciSendString (settings, rtn, Len (rtn), 0)

If i <> 0 Then MsgBox ("Settings for recording not consistent")

' If the combination is not supported you get an error!

End Sub

Public Sub WaveRecord ()

Dim rtn As String

Dim i As Long

Dim msg As String

rtn = Space$ (260)

If WaveMidiFileName <> "" Then

If WaveRecordingImmediate Then MsgBox ("Midi file " & WaveMidiFileName & " will be recorded")

i = mciSendString ("open " & WaveMidiFileName & " type sequencer alias midi", rtn, Len (rtn), 0)

If i <> 0 Then MsgBox ("Opening midi file failed!")

i = mciSendString ("play midi", rtn, Len (rtn), 0) 'Start the recording

If i <> 0 Then MsgBox ("Playing midi file failed!")

End If

i = mciSendString ("record capture", rtn, Len (rtn), 0) 'Start the recording

If i <> 0 Then MsgBox ("Recording not possible, please restart your computer... ")

End Sub

Public Sub WaveSaveAs (sName As String)

Dim rtn As String

Dim i As Long

'If file already exists then remove it

If FileExist (sName) Then

Kill (sName)

End If

'The mciSendString API call doesn't seem to like'

'long filenames that have spaces in them, so we

'will make another API call to get the short

'filename version.

'This is accomplished by the function GetShortName

'MCI command to save the WAV file

If Has_Space (sName) Then

WaveShortFileName = GetShortName (sName)

WaveLongFileName = sName

WaveRenameNecessary = True

' These are necessary in order to be able to rename file

i = mciSendString ("save capture " & WaveShortFileName, rtn, Len (rtn), 0)

Else

i = mciSendString ("save capture " & sName, rtn, Len (rtn), 0)

End If

If i <> 0 Then MsgBox ("Saving file failed, file name was: " & sName)

End Sub

Public Sub WaveStop ()

Dim rtn As String

Dim i As Long

i = mciSendString ("stop capture", rtn, Len (rtn), 0)

If i <> 0 Then MsgBox ("Stopping recording failed!")

If WaveMidiFileName <> "" Then

i = mciSendString ("stop midi", rtn, Len (rtn), 0)

If i <> 0 Then MsgBox ("Stopping playing midi file failed!")

End If

End Sub

Public Sub WavePlay ()

Dim rtn As String

Dim i As Long

i = mciSendString ("play capture from 0", rtn, Len (rtn), 0)

If i <> 0 Then MsgBox ("Start playing failed!")

End Sub

Public Sub WaveStatus ()

Dim i As Long

WaveStatusMsg = Space (255)

i = mciSendString ("status capture mode", WaveStatusMsg, 255, 0)

If i <> 0 Then MsgBox ("Failure getting wave status... ")

WaveStatusMsg = "AudioRecorder: " & WaveStatusMsg

End Sub

Public Sub WaveStatistics ()

Dim mssg As String * 255

Dim i As Long

i = mciSendString ("set capture time format ms", 0&, 0, 0)

If i <> 0 Then MsgBox ("Setting time format in milliseconds failed!")

i = mciSendString ("status capture length", mssg, 255, 0)

mssg = CStr (CLng (mssg) / 1000)

If i <> 0 Then MsgBox ("Finding length recording in milliseconds failed!")

WaveStatisticsMsg = "Length recording " & Str (mssg) & " s"

i = mciSendString ("set capture time format bytes", 0&, 0, 0)

If i <> 0 Then MsgBox ("Setting time format in bytes failed!")

i = mciSendString ("status capture length", mssg, 255, 0)

If i <> 0 Then MsgBox ("Finding length recording in bytes failed!")

WaveStatisticsMsg = WaveStatisticsMsg & " (" & Str (mssg) & " bytes)" & vbCrLf

i = mciSendString ("status capture channels", mssg, 255, 0)

If i <> 0 Then MsgBox ("Finding number of channels failed!")

If Str (mssg) = 1 Then

WaveStatisticsMsg = WaveStatisticsMsg & "Mono - "

ElseIf Str (mssg) = 2 Then

WaveStatisticsMsg = WaveStatisticsMsg & "Stereo - "

End If

i = mciSendString ("status capture bitspersample", mssg, 255, 0)

If i <> 0 Then MsgBox ("Finding resolution failed!")

WaveStatisticsMsg = WaveStatisticsMsg & Str (mssg) & " bits - "

i = mciSendString ("status capture samplespersec", mssg, 255, 0)

If i <> 0 Then MsgBox ("Finding sample rate failed!")

WaveStatisticsMsg = WaveStatisticsMsg & Str (mssg) & " samples per second " & vbCrLf & vbCrLf

End Sub

Public Sub WaveClose ()

Dim rtn As String

Dim i As Long

i = mciSendString ("close capture", rtn, Len (rtn), 0)

If i <> 0 Then MsgBox ("Closing MCI failed!")

End Sub

Public Function WavePosition () As Long

Dim rtn As String

Dim i As Long

Dim pos As String

rtn = Space (255)

pos = Space (255)

i = mciSendString ("set capture time format ms", rtn, Len (rtn), 0)

If i <> 0 Then MsgBox ("Setting format in milliseconds failed!")

i = mciSendString ("status capture position", pos, 255, 0)

If i <> 0 Then MsgBox ("Finding position failed!")

If i <> 0 Then MsgBox ("Error in position")

WavePosition = CLng (pos)

End Function

Public Sub WavePlayFrom (Position As Long)

Dim rtn As String

Dim i As Long

Dim pos As String

pos = CStr (Position)

i = mciSendString ("set capture time format ms", 0&, 0, 0)

If i <> 0 Then MsgBox ("Setting format in milliseconds failed!")

i = mciSendString ("play capture from " & pos, rtn, Len (rtn), 0)

If i <> 0 Then MsgBox ("Playing from indicated position failed!")

If i <> 0 Then MsgBox ("Play from position doesn't work... ")

End Sub

Interface in Action