作者：绿茗

一天看到一篇文章，说到RM格式的文件能通过控件prct3260.ocx格式压缩。为此，我把该控件加入VB窗体，通过object browser对象浏览器认真分析其属性事件和方法。现编一个小程序，让大家共享。
运行界面如下图所示：

两个文本框分别为txtopen，txtsave，浏览两个按钮为cmdopen，cmdsave，开始、停止和退出按钮：cmdstart，cmdstopt，cmdexit，三个显示状态label，lblface, lblfacemul,lbltime。还有一些label。
下面为源程序。
Option Explicit
Dim i As Integer, j As Integer, k As Integer
Private Sub cmdexit_Click()
Unload Me
End Sub
Private Sub cmdopen_Click()
On Error Resume Next
dlg1.DialogTitle = "请选择制作的文件"
dlg1.ShowOpen
txtopen.Text = dlg1.FileName
If Trim(txtopen.Text) <> "" Then
cmdsave.Enabled = True
cmdstart.Enabled = True
txtsave.Text = Mid(txtopen.Text, 1, InStr(txtopen.Text, ".")) & "rm"
lblface.Caption = "选择文件开始"
End If
End Sub
Private Sub cmdsave_Click()
dlg2.DialogTitle = "请输入要保存的文件"
dlg2.ShowOpen
txtsave.Text = dlg2.FileName + ".rm"
End Sub
Private Sub cmdstart_Click()
ProducerControl1.InputFilename = ""
ProducerControl1.OutputFilename = ""
ProducerControl1.InputFilename = txtopen.Text
ProducerControl1.OutputFilename = txtsave.Text
ProducerControl1.StartEncoding
lblfacemul.Caption = "共1个文件"
cmdstart.Enabled = False
cmdsave.Enabled = False
cmdopen.Enabled = False
cmdstop.Enabled = True
lblface.Caption = "压缩开始...."
lbltime.Caption = "00:00:00"
Timer1.Enabled = True
i = 0
j = 0
k = 0
End Sub
Private Sub cmdstop_Click()
ProducerControl1.StopEncoding
cmdsave.Enabled = False
cmdopen.Enabled = False
lblface.Caption = "用户停止"
cmdstart.Enabled = True
cmdstop.Enabled = False
cmdopen.Enabled = True
cmdsave.Enabled = True
Timer1.Enabled = False
lblfacemul.Caption = "共压缩1个文件"
End Sub
Private Sub Form_Load()
Timer1.Enabled = False
Timer1.Interval = 1000
cmdstart.Enabled = False
cmdstop.Enabled = False
cmdsave.Enabled = False
dlg1.Filter = "Media Files(*.dat;*.mov;*.mp3;*.avi) *.dat;*.mov;*.mp3;*.avi Mpeg Files(*.mpg;*.mpeg;*.mpa;*.mp2;*.mp3) *.mpg;*.mpeg;*.mpa;*.mp2;*.mp3 QuickTime Files(*.mov;*.qt) *.mov;*.qt Audio Files(*.wav;*.au) *.wav;*.au"
dlg1.FilterIndex = 1
dlg1.InitDir = App.path
dlg2.Filter = "RM格式(*.rm) *.rm"
txtopen.Text = ""
txtsave.Text = ""
ProducerControl1.InputType = INPUT_SOURCE_FILE '压缩文件
ProducerControl1.TempDirectory = "c:\windows\temp" '暂存目录
lblface.Caption = "请选择文件"
lbltime.Caption = "00:00:00"
ProducerControl1.Target256KDSLCableModem = True '目标听从为256线缆
ProducerControl1.InputDoAudio = True '音频输入为真
ProducerControl1.InputDoVideo = True '视频输入为真
ProducerControl1.AudioContent = AUDIO_CONTENT_VOICE_BACKGROUND '声音和背景音乐
ProducerControl1.VideoQuality = VIDEO_QUALITY_SMOOTH_MOTION '平滑图象
End Sub
Private Sub ProducerControl1_OnEncodingProgressChanged(ByVal duration As Long, ByVal timestamp As Long, ByVal PercentDone As Long, ByVal AudioPeakLevel As Long)
lblfacemul.Caption = "已压缩 " + CStr(PercentDone) + "%" '显示压缩百分比率
End Sub
Private Sub ProducerControl1_OnEncodingStopped()
Timer1.Enabled = False
cmdstop.Enabled = False
cmdstart.Enabled = True
lblface.Caption = "压缩完成"
lblfacemul.Caption = "谢谢您的使用!"
End Sub
Private Sub Timer1_Timer()
i = i + 1
If i > 59 Then
i = 0
j = j + 1
End If
If j > 59 Then
j = 0
k = k + 1
End If
If k > 23 Then
k = 0
End If
lbltime.Caption = Format(k, "00") & ":" & Format(j, "00") & ":" & Format(i, "00")
End Sub
以上简单的实现了RM文件的压缩，通过对象浏览器，你可以为程序增加批量压缩功能，可以设定目标听众等，因篇幅关系，我就不写出来了。欢迎与我交流（elby@21cn.com）。