79.txt

介绍VB里的各种控件的使用方法,窗口控制,图像编程以及OCX等内容,还提供了一个API集供参考.

指定文件夹

大家看仔细了，是指定文件夹，不是指定文件。指定文件夹很简单，用通用对话框就行了。但是指定文件就不同了。下面是
实现的方法。

声明

Private Type BrowseInfo
     hWndOwner As Long
     pIDLRoot As Long
     pszDisplayName As Long
     lpszTitle As Long
     ulFlags As Long
     lpfnCallback As Long
     lParam As Long
     iImage As Long
End Type

Private Const BIF_RETURNONLYFSDIRS = 1
Private Const MAX_PATH = 260

 

Private Declare Sub CoTaskMemFree Lib "ole32.dll" (ByVal hMem As Long)

Private Declare Function lstrcat Lib "kernel32" Alias "lstrcatA" (ByVal lpString1 As String, ByVal lpString2 As String) As Long

Private Declare Function SHBrowseForFolder Lib "shell32" (lpbi As BrowseInfo) As Long

Private Declare Function SHGetPathFromIDList Lib "shell32" (ByVal pidList As Long, ByVal lpBuffer As String) As Long

代码

Public Function BrowseForFolder(hWndOwner As Long, sPrompt As String) As String

Dim iNull As Integer
Dim lpIDList As Long
Dim lResult As Long
Dim sPath As String
Dim udtBI As BrowseInfo


    With udtBI
        .hWndOwner = hWndOwner
        .lpszTitle = lstrcat(sPrompt, "")
        .ulFlags = BIF_RETURNONLYFSDIRS
    End With

    lpIDList = SHBrowseForFolder(udtBI)

    If lpIDList Then
        sPath = String$(MAX_PATH, 0)
       lResult = SHGetPathFromIDList(lpIDList, sPath)
        Call CoTaskMemFree(lpIDList)
        iNull = InStr(sPath, vbNullChar)

        If iNull Then
            sPath = Left$(sPath, iNull - 1)
        End If

    End If

    BrowseForFolder = sPath

End Function

用法

sDirectoryName = BrowseForFolder(Me.hWnd, "请选择目录")