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--  专家坐堂  (http://www.foxtable.com/bbs/list.asp?boardid=2)
----  大师请教输出  (http://www.foxtable.com/bbs/dispbbs.asp?boardid=2&id=139849)
--  作者：hbhb
--  发布时间：2019/8/23 9:26:00
--  大师请教输出
大师：下面的代码：

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 Function EnumerateFiles(ByVal path 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
            output.show(io.Path.Combine(path, FindFileData.cFileName))
        End If
    Loop While FindNextFile(hFind, FindFileData)
    FindClose(hFind)
    
End If

End Function


请问如何把红色部分输出到窗口中的一个标签显示？
--  作者：有点蓝
--  发布时间：2019/8/23 9:49:00
--  
函数添加一个参数，把窗口或者窗口名称传进来

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

然后就可以使用窗口了
frm.controls("label1").text = io.Path.Combine(path, FindFileData.cFileName)
--  作者：hbhb
--  发布时间：2019/8/23 10:09:00
--  
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。
--  作者：有点蓝
--  发布时间：2019/8/23 10:28:00
--  
是
--  作者：hbhb
--  发布时间：2019/8/23 10:42:00
--  
添加参数后显示，应为“optional”。不好添加参数？为何？
--  作者：有点蓝
--  发布时间：2019/8/23 10:51:00
--  
那就到其它ByVal Optional 参数的前面

Public Function EnumerateFiles(ByVal path As String, frm as WinForm.Form, ByVal Optional searchPattern As String = "*.*", ByVal Optional searchOption As IO.SearchOption = IO.SearchOption.AllDirectories)
--  作者：hbhb
--  发布时间：2019/8/23 12:23:00
--  
不行呀，显示没有为frm指定参数。
--  作者：有点蓝
--  发布时间：2019/8/23 13:34:00
--  
写了什么代码？
--  作者：hbhb
--  发布时间：2019/8/23 16:24:00
--  

<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
--  作者：有点蓝
--  发布时间：2019/8/23 16:31:00
--  
外部是怎么调用的？