ShellExecute 的应用技巧

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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:vbcode@vbcode.com", 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"

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