作者：绿色风
分类：
时间：2022-08-17
浏览：98
楼主
chrisfang |
Q：Shell对象的Exec和Run方法有何异同之处?
A：VBScript中的WScript.Shell对象有两个比较相像的方法Exec和Run，他们的语法如下：
Function Exec(ByVal Command As String) As WshExec
Function Run(ByVal Command As String, [ByVal WindowStyle], [ByVal WaitOnReturn]) As Integer
两个方法都能调用外部程序执行。
他们的不同之处在于：
1，返回值
Exec返回的是一个对象，从返回对象中可以获得控制台输出信息和控制台错误信息，即StdOut和StdErr属性等。例如以下代码：
- Set oShell = CreateObject("WSCript.shell")
- commandLine = "Dir c:"
- Set exeRs = oShell.Exec(commandLine)
- errMsg = exeRs.StdErr.ReadAll()
- stdMsg = exeRs.StdOut.ReadAll()
而run返回一个值，执行成功为0，失败为1。
2，执行参数
Exec没有执行参数，而Run包含两个参数，一个是cmd窗口的风格（具体见下表），另一个是否等待执行完成，如果等待则设置为True，可以在外部程序执行完毕以后再继续运行后续代码。如果设置为False则直接转入后续语句。
附表，cmd窗口风格代码：
intWindowStyle
| Description | | 0 | Hides the window and activates another window. | | 1 | Activates and displays a window. If the window is minimized or maximized, the system restores it to its original size and position. An application should specify this flag when displaying the window for the first time. | | 2 | Activates the window and displays it as a minimized window. | | 3 | Activates the window and displays it as a maximized window. | | 4 | Displays a window in its most recent size and position. The active window remains active. | | 5 | Activates the window and displays it in its current size and position. | | 6 | Minimizes the specified window and activates the next top-level window in the Z order. | | 7 | Displays the window as a minimized window. The active window remains active. | | 8 | Displays the window in its current state. The active window remains active. | | 9 | Activates and displays the window. If the window is minimized or maximized, the system restores it to its original size and position. An application should specify this flag when restoring a minimized window. | | 10 | Sets the show-state based on the state of the program that started the application.
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