Question

我有一些代码，它在执行时崩溃，似乎是错的？

Imports WMEncoderLib
Imports WMPREVIEWLib

Imports System.IO
Public Class Form1
    Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        ''//This call is required by the Windows Form Designer.
        InitializeComponent()

        ''//Add any initialization after the InitializeComponent() call

    End Sub

    ''//Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    ''//Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    ''//NOTE: The following procedure is required by the Windows Form Designer
    ''//It can be modified using the Windows Form Designer.  
    ''//Do not modify it using the code editor.
    Friend WithEvents Button1 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Button1 = New System.Windows.Forms.Button
        Me.SuspendLayout()
        ''//
        ''//Button1
        ''//
        Me.Button1.Location = New System.Drawing.Point(48, 80)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(216, 23)
        Me.Button1.TabIndex = 1
        Me.Button1.Text = "Write To file and Close application"
        ''//
        ''//Form1
        ''//
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 266)
        Me.Controls.Add(Me.Button1)
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)

    End Sub

#End Region
    Dim Encoder As WMEncoder
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        ''// Create a WMEncoder object.

        Encoder = New WMEncoder
        ''// Retrieve the source group collection and add a source group. 

        Dim SrcGrp As IWMEncSourceGroup2
        Dim SrcGrpColl As IWMEncSourceGroupCollection
        SrcGrpColl = Encoder.SourceGroupCollection
        SrcGrp = SrcGrpColl.Add("SG_1")

        ''// Add a video and audio source to the source group.
        Dim SrcVid As IWMEncVideoSource2
        Dim SrcAud As IWMEncAudioSource
        SrcVid = SrcGrp.AddSource(WMENC_SOURCE_TYPE.WMENC_VIDEO)
        SrcAud = SrcGrp.AddSource(WMENC_SOURCE_TYPE.WMENC_AUDIO)

        ''// Identify the source files to encode.
        SrcVid.SetInput("ScreenCap://ScreenCapture1")
        SrcAud.SetInput("Device://Default_Audio_Device")

        ''// Choose a profile from the collection.
        Dim ProColl As IWMEncProfileCollection
        Dim Pro As IWMEncProfile
        Dim i As Integer
        Dim lLength As Long

        ProColl = Encoder.ProfileCollection
        lLength = ProColl.Count
        ''//For i = 0 To lLength - 1
        ''//    Console.WriteLine(ProColl.Item(i).Name)
        ''//Next
        For i = 0 To lLength - 1
            Pro = ProColl.Item(i)
            If Pro.Name = "Windows Media Video 8 for Local Area Network (384 Kbps)" Then
                SrcGrp.Profile = Pro
                Exit For
            End If
        Next

        ''// Fill in the description object members.
        Dim Descr As IWMEncDisplayInfo
        Descr = Encoder.DisplayInfo
        Descr.Author = "Armoghan Asif"
        Descr.Copyright = "Copyright information"
        Descr.Description = "Text description of encoded content"
        Descr.Rating = "Rating information"
        Descr.Title = "Title of encoded content"

        ''// Add an attribute to the collection.
        Dim Attr As IWMEncAttributes
        Attr = Encoder.Attributes
        Attr.Add("URL", "www.adnare.com")

        ''// Specify a file object in which to save encoded content.
        Dim File As IWMEncFile
        File = Encoder.File
        File.LocalFileName = "C:\OutputFile.avi"

        ''// Crop 2 pixels from each edge of the video image.
        SrcVid.CroppingBottomMargin = 2
        SrcVid.CroppingTopMargin = 2
        SrcVid.CroppingLeftMargin = 2
        SrcVid.CroppingRightMargin = 2

        ''// Start the encoding process.
        Encoder.Start()

    End Sub


    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        If Encoder.RunState Then
            Encoder.Stop()
            Application.Exit()
        End If
    End Sub
End Class

一旦它开始崩溃，我就没有得到它

由于

Answer 1

通常这是因为您的参考资料是旧的或不适合您的操作系统。那么也许你是在64位Vista上，你引用的DLL是16位？那种事。

Answer 2

这个代码崩溃可能有一百个理由。

首先，考虑从Form_Load事件中将其更改为要从表单上的按钮执行，只是为了将应用程序的启动与此Windows Media Encoder作业启动隔离开来。

然后在整个代码中设置断点，并找出它到底有多远。此外，当你说它“崩溃”时，这是什么意思？如果Windows Media Converter或任何其他常规DirectX组件引发错误，通常会出现与之关联的错误编号/代码。你有错误吗？

最后，您的代码是否实际到达 Encoder.Start（）？

代码导致崩溃（vb .net）

2 个答案: