以默认程序打开文档 
  要以与文件后缀名关联的程序打开文档,在Windows 9X和Windows NT下可以用ShellExcute函数方便地实现。这则小技巧展示了会有多方便—你只需要一个声明和一行代码!   开始一个新项目。在Form上放一个Command button,然后加入以下代码: Private Declare Function ShellExecute Lib "shell32.dll" Alias "ShellExecuteA" _ (ByVal hWnd As Long, ByVal lpOperation As String, _  ByVal lpFile As String, ByVal lpParameters As String, _  ByVal lpDirectory As String, ByVal nShowCmd As Long) As Long
  Private Const SW_NORMAL=1 '(这些API常量可以用VB常量代替,比如vbNormalFocus) Private Const SW_MAXIMIZE=3 Private Const SW_MINIMIZE=6 Private Const SW_SHOW = 5
  Private Sub Command1_Click()   Dim lR As Long   Dim sFile As String   Dim iFile As Integer 
   ' 创建一个测试用的文本文件  sFile = App.Path & "\SHELLTST.TXT"   On Error Resume Next   Kill sFile   On Error GoTo 0   iFile = FreeFile   Open sFile For Binary Access Write As #iFile   Put #iFile, , "这是一个测试文件,演示ShellExecute API函数。"   Close #iFile 
   ' 依照文件名打开这个文本。Windows将会检查哪个可执行程序与.TXT关联   ' (默认一般是Notepad),并运行程序打开文档   lR = ShellExecute(Me.hWnd, "Open", sFile, "", "", vbNormalFocus)   If (lR < 0) Or (lR > 32) Then     ' 成功   Else    MsgBox "无法打开 '" & sFile & "'", vbInformation   End If  End Sub 
    当你点击command button,将会在项目所在目录创建一个文本文件,并用默认程序打开(一般是Notepad)。 ===============================================
  译者附:   本函数还可以用来连接到网页,照下面写就行了: ShellExecute 0&, vbNullString, "http://coolbasic.yeah.net", vbNullString, vbNullString, vbNormalFocus 
    或者这样写来发送Email: ShellExecute me.hwnd, "open", "mailto:[email protected]", vbNullString, vbNullString, SW_SHOW
  另外有ShellExecute的替代用法,更加简单实用,不用API,一句Shell搞定!
  连接到网页:   Shell "rundll32.exe url.dll,FileProtocolHandler http://www.online.sh.cn" 打开文件:   Shell "rundll32.exe url.dll,FileProtocolHandler " & App.Path & "\SHELLTST.TXT"   
 
  |