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主题:大师:能否给一个实例

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  发帖心情 Post By:2019/9/18 10:13:00 [显示全部帖子]

For Each File As String In FileSys.GetFiles("C:\")
    If file.EndsWith(".jpg") Then
        Output.Show(File)
    End If
    Application.Doevents
    If vars("exit") = True Then Exit For
Next

停止按钮
vars("exit") = true

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  发帖心情 Post By:2019/9/18 11:45:00 [显示全部帖子]


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  发帖心情 Post By:2019/9/18 17:38:00 [显示全部帖子]

比如

 Do
If vars("stop") = True Then 
if MessageBox.Show("已暂停,按是继续,按否退出查找!", "提示", MessageBoxButtons.YesNo, MessageBoxIcon.Question) = DialogResult.Yes then
 vars("stop") = false
else
exit do
endif
end if
        If FindFileData.cFileName.Equals(".") OrElse FindFileData.cFileName.Equals("..") Then Continue Do
        
        If  searchOption = io.SearchOption.AllDirectories AndAlso ((FindFileData.dwFileAttributes And io.FileAttributes.Directory) = io.FileAttributes.Directory) Then
            'output.show(io.Path.Combine(path, FindFileData.cFileName))
            EnumerateFiles(io.Path.Combine(path, FindFileData.cFileName))
        Else
            output.show(io.Path.Combine(path, FindFileData.cFileName))
        End If

    Loop While FindNextFile(hFind, FindFileData)
    FindClose(hFind)

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  发帖心情 Post By:2019/9/19 13:36:00 [显示全部帖子]

全局代码

<DllImport("kernel32.dll", CharSet:=System.Runtime.InteropServices.CharSet.Auto, SetLastError:=True)> _
Public Function FindFirstFile(ByVal pFileName As String, ByRef pFindFileData As WIN32_FIND_DATA) As IntPtr
End Function
<DllImport("kernel32.dll", CharSet:=System.Runtime.InteropServices.CharSet.Auto, SetLastError:=True)> _
Public Function FindNextFile(ByVal hndFindFile As IntPtr, ByRef lpFindFileData As WIN32_FIND_DATA) As Boolean
End Function
<DllImport("kernel32.dll", SetLastError:=True)> _
Public Function FindClose(ByVal hndFindFile As IntPtr) As Boolean
End Function
<Serializable, StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Auto), BestFitMapping(False)> _
Public Structure WIN32_FIND_DATA
Public dwFileAttributes As IO.FileAttributes
Public ftCreationTime_dwLowDateTime As UInteger
Public ftCreationTime_dwHighDateTime As UInteger
Public ftLastAccessTime_dwLowDateTime As UInteger
Public ftLastAccessTime_dwHighDateTime As UInteger
Public ftLastWriteTime_dwLowDateTime As UInteger
Public ftLastWriteTime_dwHighDateTime As UInteger
Public nFileSizeHigh As UInteger
Public nFileSizeLow As UInteger
Public dwReserved0 As Integer
Public dwReserved1 As Integer
<MarshalAs(UnmanagedType.ByValTStr, SizeConst:=260)> _
Public cFileName As String
<MarshalAs(UnmanagedType.ByValTStr, SizeConst:=14)> _
Public cAlternateFileName As String
End Structure

Public m_scopes As new Stack(of String)()

Public Function EnumerateFiles(ByVal rootDir As String, ByVal Optional searchOption As IO.SearchOption = IO.SearchOption.AllDirectories) As Boolean
Dim path = rootDir

start:

Dim hFind As IntPtr = -1
Dim FindFileData As WIN32_FIND_DATA = Nothing
hFind = FindFirstFile(IO.Path.Combine(path, "*.*" ), FindFileData)
If hFind <> -1 Then
    
    Do
        If FindFileData.cFileName.Equals(".") OrElse FindFileData.cFileName.Equals("..") Then Continue Do
        
        If  searchOption = io.SearchOption.AllDirectories AndAlso ((FindFileData.dwFileAttributes And io.FileAttributes.Directory) = io.FileAttributes.Directory) Then
            'output.show("----" & io.Path.Combine(path, FindFileData.cFileName))
            m_scopes.Push(io.Path.Combine(path, FindFileData.cFileName))
        Else
            output.show(io.Path.Combine(path, FindFileData.cFileName))
        End If
        Application.Doevents
    Loop While FindNextFile(hFind, FindFileData)
    FindClose(hFind)
    If m_scopes.Count > 0
        
        If vars("pause") = True Then
            Return False
        End If
        
        path = m_scopes.Pop()
        goto start
    End If
End If
Return True
End Function

开始 / 继续按钮
vars("pause") = False
Dim path = "e:\"
If m_scopes.Count > 0
    path = m_scopes.Pop()
End If
EnumerateFiles(path)

暂停按钮
vars("pause") = True

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  发帖心情 Post By:2019/9/20 8:31:00 [显示全部帖子]

以下是引用hbhb在2019/9/19 17:48:00的发言:
谢谢!那加两个参数把output.show(io.Path.Combine(path, FindFileData.cFileName)) 输出到指定的窗口的标签中显示?是否会影响搜索效率?

肯定多多少少有一点

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