如何调用getopenfilename函数.txt

VB技巧问答10000例 VB技巧问答10000例

下面是GetOpenFileName的例子： 
     Option Explicit 
     
     Private Declare Function GetOpenFileName Lib "comdlg32.dll" Alias _ 
     "GetOpenFileNameA" (pOpenfilename As OPENFILENAME) As Long 
     
     Private Type OPENFILENAME 
     lStructSize As Long 
     hwndOwner As Long 
     hInstance As Long 
     lpstrFilter As String 
     lpstrCustomFilter As String 
     nMaxCustFilter As Long 
     nFilterIndex As Long 
     lpstrFile As String 
     nMaxFile As Long 
     lpstrFileTitle As String 
     nMaxFileTitle As Long 
     lpstrInitialDir As String 
     lpstrTitle As String 
     flags As Long 
     nFileOffset As Integer 
     nFileExtension As Integer 
     lpstrDefExt As String 
     lCustData As Long 
     lpfnHook As Long 
     lpTemplateName As String 
     End Type 
     
     Private Sub Command1_Click() 
     Dim OpenFile As OPENFILENAME 
     Dim lReturn As Long 
     Dim sFilter As String 
     OpenFile.lStructSize = Len(OpenFile) 
     OpenFile.hwndOwner = Form1.hWnd 
     OpenFile.hInstance = App.hInstance 
     sFilter = "Batch Files (*.bat)" & Chr(0) & "*.BAT" & Chr(0) 
     OpenFile.lpstrFilter = sFilter 
     OpenFile.nFilterIndex = 1 
     OpenFile.lpstrFile = String(257, 0) 
     OpenFile.nMaxFile = Len(OpenFile.lpstrFile) - 1 
     OpenFile.lpstrFileTitle = OpenFile.lpstrFile 
     OpenFile.nMaxFileTitle = OpenFile.nMaxFile 
     OpenFile.lpstrInitialDir = "C:\" 
     OpenFile.lpstrTitle = "Use the Comdlg API not the OCX" 
     OpenFile.flags = 0 
     lReturn = GetOpenFileName(OpenFile) 
     If lReturn = 0 Then 
     MsgBox "The User pressed the Cancel Button" 
     Else 
     MsgBox "The user Chose " & Trim(OpenFile.lpstrFile) 
     End If 
     End Sub 
    选择颜色的函数是ChooseColor，选择字体的函数是ChooseFont。几个函数的用法类似，都是调用一个结构，结构的定义在Win32api.txt中可以找到，详细的说明在Win API的帮助中有。 
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