vb一个使用URLDownloadToFile实现文件下载的类

最新推荐文章于 2022-05-22 21:32:07 发布

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最新推荐文章于 2022-05-22 21:32:07 发布 · 2.2k 阅读

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这个VB类利用olelib.URLDownloadToFile方法实现文件的下载，并通过事件OnProgress实时报告下载进度。用户可以指定下载URL和保存路径，通过事件触发来监控下载状态。

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一个使用URLDownloadToFile函数和IBindStatusCallback接口编写的文件下载类，类名称为URLDownFile。在复制以下代码之前，朋友们需要先先下载Edanmo编写的一个名为olelib.tlb的类型库文件，类的具体代码如下：

Option Explicit

Implements IBindStatusCallback
Public Event OnProgress(ByVal lMax As Long, ByVal lProgress As Long, ByVal lStatusCode As BINDSTATUS)

Public Function DownloadFile(ByVal strURL As String, ByVal strFileName As String) As Boolean
    Dim lResult As Long
    lResult = olelib.URLDownloadToFile(Nothing, strURL, strFileName, 0, Me)
    DownloadFile = (lResult = 0)
End Function
Private Sub IBindStatusCallback_OnProgress(ByVal lProgress As Long, ByVal lMax As Long, ByVal lStatusCode As BINDSTATUS, ByVal szStatusText As Long)
    On Error Resume Next
    If lMax > 0 Then
        RaiseEvent OnProgress(lMax, lProgress, lStatusCode)
    End If
End Sub
Private Sub IBindStatusCallback_OnStartBinding(ByVal dwReserved As Long, ByVal pib As IBinding)
End Sub
Private Sub IBindStatusCallback_OnStopBinding(ByVal hresult As Long, ByVal szError As Long)
End Sub
Private Sub IBindStatusCallback_GetBindInfo(grfBINDF As olelib.BINDF, pbindinfo As BINDINFO)
End Sub
Private Function IBindStatusCallback_GetPriority() As Long
End Function
Private Sub IBindStatusCallback_OnDataAvailable(