IC Imaging Control ActiveX

AviCompressor.CompressorDataSize Property

AviCompressor.CompressorDataSize Property

Returns the size of the SAFEARRAY of Byte returned by CompressorData.
Syntax:
Public CompressorDataSize As Long
Limitations:

Read only.

Remarks:

The CompressorDataSize is useful, if codec properties are to be saved to a file. Reading the size value first from file, enables an application to create an array of the matching size that will get the codec properties.

Sample:

How to use the CompressorDataSize is shown in the sample Saving Codec Properties.

' Global declaration of the AviCompressr object
Dim Codec As AviCompressor

Save the data from a codec that was selected in a combo box.

Private Sub cmdSaveData_Click()
    Dim Data() As Byte ' Dynamic array for the data stream.

    Open "test.bin" For Binary As #1 ' Must be opened binary!

    ' Save the length of the codec's name.
    Put #1, , Len(Codec.Name)

    ' Save the name of the codec.
    Put #1, , Codec.Name

    ' Save the byte count of the data stream. It is used
    ' when data is loaded from file to resize the dynamic array.
    Put #1, , Codec.CompressorDataSize

    ' Get the data from the codec.
    Data = Codec.CompressorData

    ' Save the data to the file.
    Put #1, , Data
    Close #1
End Sub

Load the previously saved data and assign it to a codec.

Private Sub cmdLoadData_Click()
    Dim Data() As Byte      ' Dynamic array for the data stream.
    Dim Length As Long      ' Length of the data stream.
    Dim NameLength As Long  ' Length of the codec's name.
    Dim CodecName As String ' Name of the codec.
    Dim i As Integer

    Open "test.bin" For Binary As #1 ' Must be opened binary!

    ' Read the length of the codec's name.
    Get #1, , NameLength

    ' Allocate memory for the name.
    CodecName = String(NameLength, " ")

    ' Read the name of the codec.
    Get #1, , CodecName

    ' Compare the names.
    If CodecName = Codec.Name Then
        ' Read the length of the follwing data.
        Get #1, , Length

        ' Resize the data array to Length.
        ReDim Data(Length)

        ' Read the codec data from the file.
        Get #1, , Data

        ' Assign the read data to the codec object.
        Codec.CompressorData = Data
    Else
        MsgBox "The saved data does not match to the used codec." + Chr(13) + _
               "saved: " + CodecName + Chr(13) + _
               "used: " + Codec.Name
    End If
    Close #1
End Sub
See Also: AviCompressor, AviCompressor.CompressorData

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