主题：大师请教输出

大师：下面的代码：

谢谢！那函数调用时，EnumerateFiles（“c:\”,"",forms("窗口1")），标签名不是“label1”，是不是也要添加一个参数。

添加参数后显示，应为“optional”。不好添加参数？为何？

不行呀，显示没有为frm指定参数。

<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 Function EnumerateFiles(ByVal path As String,ByVal frm as WinForm.Form,ByVal lab1 as String,ByVal Optional searchPattern As String = "*.*", ByVal Optional searchOption As IO.SearchOption = IO.SearchOption.AllDirectories)

Dim hFind As IntPtr = -1
Dim FindFileData As WIN32_FIND_DATA = Nothing

hFind = FindFirstFile(IO.Path.Combine(path, searchPattern), 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))
            EnumerateFiles(io.Path.Combine(path, FindFileData.cFileName))
        Else
            

frm.controls(lab1).text = io.Path.Combine(path, FindFileData.cFileName)

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

End Function

以上代码在全局代码编辑器中保存不了，显示没有为frm指定参数。

大师：哪里有问题，我在窗口中按钮中这样EnumerateFiles(e.Form,"Label1", "d:\","*.mdb") 调用此函数，为何标签只显示一个就停了，而output.show是不停地输出结果？