Memantau kemajuan dengan peristiwa

Beberapa antarmuka memungkinkan Anda menerapkan penanganan aktivitas untuk menerima informasi kemajuan. Misalnya, objek peristiwa dapat dilampirkan ke penulis data untuk menerima status operasi tulis.

Pengendali acara diimplementasikan sebagai subrutin dalam skrip. Contoh berikut menunjukkan cara menentukan subroutine dan menggunakan metode WScript.ConnectObject untuk menyambungkan penanganan aktivitas ke objek.

    ' Create the MsftDiscFormat2Data object (see the IDiscFormat2Data interface).
    Set dataWriter = CreateObject ("IMAPI2.MsftDiscFormat2Data")

    ' Attach event handler (see the DDiscFormat2DataEvents interface).
    ' The "dwBurnEvent_" parameter identifies the handler (see the 
    ' dwBurnEvent_Update subroutine).
    WScript.ConnectObject  dataWriter, "dwBurnEvent_"

' Event handler for the MsftDiscFormat2Data.Write method.
' For details of the subroutine's parameters, see the 
' DDiscFormat2DataEvents::Update method.
SUB dwBurnEvent_Update( byRef object, byRef progress )
    ' --- Other code occurs here. 
END SUB

Nama yang ditentukan untuk nama penanganan aktivitas harus berisi akhiran garis bawah ("_"). Untuk membentuk nama subroutine, gabungkan nama metode ke nama penanganan aktivitas. Misalnya, jika Anda menggunakan "dataWriterEvent_" sebagai nama penanganan aktivitas dan nama metodenya adalah "Perbarui", nama subroutine akan dataWriterEvent_Update.

Contoh berikut menunjukkan pendekatan alternatif untuk menghubungkan penanganan aktivitas ke objek.

    ' Create object and connect the event handler in one step.
    '   Set dataWriter = _
    '   WScript.CreateObject("IMAPI2.MsftDiscFormat2Data","dwBurnEvent_")


' Event handler  
SUB dwBurnEvent_Update( byRef object, byRef progress )
    '--- Other code occurs here. 
END SUB

Jika ada perangkat pembakar kedua pada sistem yang perlu dipantau, Anda harus membuat objek MsftDiscFormat2Data lain dan pengendali kejadian.

Contoh berikut berdasarkan pada contoh Membakar Gambar Disk. Contoh menulis gambar ISO ke disk kosong dan menggunakan penanganan aktivitas untuk memberikan pembaruan kemajuan.

' This script burns data files to disc in a single session 
' using files from a single directory tree. 

' Copyright (C) Microsoft Corp. 2006

Option Explicit

' *** CD/DVD disc file system types
Const FsiFileSystemISO9660 = 1
Const FsiFileSystemJoliet  = 2
Const FsiFileSystemUDF102  = 4

' *** IFormat2Data Write Action Enumerations
Const IMAPI_FORMAT2_DATA_WRITE_ACTION_VALIDATING_MEDIA      = 0
Const IMAPI_FORMAT2_DATA_WRITE_ACTION_FORMATTING_MEDIA      = 1
Const IMAPI_FORMAT2_DATA_WRITE_ACTION_INITIALIZING_HARDWARE = 2
Const IMAPI_FORMAT2_DATA_WRITE_ACTION_CALIBRATING_POWER     = 3
Const IMAPI_FORMAT2_DATA_WRITE_ACTION_WRITING_DATA          = 4
Const IMAPI_FORMAT2_DATA_WRITE_ACTION_FINALIZATION          = 5
Const IMAPI_FORMAT2_DATA_WRITE_ACTION_COMPLETED             = 6
const IMAPI_FORMAT2_DATA_WRITE_ACTION_VERIFYING             = 7

WScript.Quit(Main)

Function Main
    Dim Index                ' Index to recording drive.
    Dim Recorder             ' Recorder object
    Dim Path                 ' Directory of files to burn
    Dim Stream               ' Data stream for burning device
    
    Index = 1                ' Second drive on the system
    Path = "c:\test\imt\data\2tracks"      ' Files to transfer to disc

    ' Create a DiscMaster2 object to connect to CD/DVD drives.
    Dim g_DiscMaster
    Set g_DiscMaster = WScript.CreateObject("IMAPI2.MsftDiscMaster2")

    ' Create a DiscRecorder object for the specified burning device.
    Dim uniqueId
    set recorder = WScript.CreateObject("IMAPI2.MsftDiscRecorder2")
    uniqueId = g_DiscMaster.Item(index)
    recorder.InitializeDiscRecorder( uniqueId )

    ' Create an image stream for a specified directory.
    Dim FSI                  'Disc file system
    Dim Dir                  'Root directory of the disc file system
    Dim dataWriter    
        
    ' Create a new file system image and retrieve root directory
    Set FSI = CreateObject("IMAPI2FS.MsftFileSystemImage")
    Set Dir = FSI.Root

    ' Define the new disc format and set the recorder
    Set dataWriter = CreateObject ("IMAPI2.MsftDiscFormat2Data")
    dataWriter.recorder = Recorder
    dataWriter.ClientName = "IMAPIv2 TEST"

    FSI.FreeMediaBlocks = dataWriter.FreeSectorsOnMedia
    FSI.FileSystemsToCreate = FsiFileSystemISO9660

    ' Add the directory and its contents to the file system 
    Dir.AddTree Path, false
        
    ' Create an image from the file system
    Dim result
    Set result = FSI.CreateResultImage()
    Stream = result.ImageStream
    
    ' Attach event handler to the data writing object.
    WScript.ConnectObject  dataWriter, "dwBurnEvent_"

    ' Specify the recorder and write the stream to disc.
    WScript.Echo "Writing content to disc..."
    dataWriter.write(Stream)

    WScript.Echo "----- Finished writing content -----"
    Main = 0
End Function

' Event handler - Progress updates when writing data

SUB dwBurnEvent_Update( byRef object, byRef progress )
    DIM strTimeStatus
    strTimeStatus = "Time: " & progress.ElapsedTime & _
        " / " & progress.TotalTime
   
    SELECT CASE progress.CurrentAction
    CASE IMAPI_FORMAT2_DATA_WRITE_ACTION_VALIDATING_MEDIA
        WScript.Echo "Validating media " & strTimeStatus

    CASE IMAPI_FORMAT2_DATA_WRITE_ACTION_FORMATTING_MEDIA
        WScript.Echo "Formatting media " & strTimeStatus
        
    CASE IMAPI_FORMAT2_DATA_WRITE_ACTION_INITIALIZING_HARDWARE
        WScript.Echo "Initializing Hardware " & strTimeStatus

    CASE IMAPI_FORMAT2_DATA_WRITE_ACTION_CALIBRATING_POWER
        WScript.Echo "Calibrating Power (OPC) " & strTimeStatus

    CASE IMAPI_FORMAT2_DATA_WRITE_ACTION_WRITING_DATA
        DIM totalSectors, writtenSectors, percentDone
        totalSectors = progress.SectorCount
        writtenSectors = progress.LastWrittenLba - progress.StartLba
        percentDone = FormatPercent(writtenSectors/totalSectors)
        WScript.Echo "Progress:  " & percentDone & "  " & strTimeStatus

    CASE IMAPI_FORMAT2_DATA_WRITE_ACTION_FINALIZATION
        WScript.Echo "Finishing the writing " & strTimeStatus
    
    CASE IMAPI_FORMAT2_DATA_WRITE_ACTION_COMPLETED
        WScript.Echo "Completed the burn."

    CASE IMAPI_FORMAT2_DATA_WRITE_ACTION_VERIFYING
        WScript.Echo "Verifying the data."

    CASE ELSE
        WScript.Echo "Unknown action: " & progress.CurrentAction
    END SELECT
END SUB

Topik terkait

Menggunakan IMAPI

IStream

IDiscMaster2

IDiscFormat2Data

IFileSystemImage