为什么 VBScript 有时会在 WshShell.Exec 中阻塞？

Question

我有一个使用 WshShell.Exec 获取 Windows 版本的 html 应用程序 (HTA)。我正在使用wmic os get Caption 获取特定版本，该版本在命令行和批处理脚本中运行良好。我还测试了我调用WshShell.Exec 的方式，它可以与其他命令（即echo Windows 2008）一起正常工作。当我尝试将这些东西结合起来时，就会出现问题，而 Exec 似乎只是冻结了。你能推荐一个解决这个问题的方法吗？这是我的代码：

Function GetWinVersion
    'Returns 2008, XP, or 7
    set WshShell = CreateObject("WScript.Shell")
    set oExec = WshShell.Exec("wmic os get Caption")
    do while oExec.Status = 0
        'I added this very busy wait, though it doesn't seem to help
        'Would sleep if it was available in an hta
    loop
    While oExec.StdOut.AtEndOfStream <> True
        thisLine = oExec.StdOut.ReadLine
        'MsgBox "Found line: " & thisLine
        if InStr(thisLine, "2008") > 0 then
            GetWinVersion=2008
            Exit Function
        elseif InStr(thisLine, "XP") > 0 then
            GetWinVersion=XP
            Exit Function
        elseif InStr(thisLine, "Windows 7") > 0 then
            GetWinVersion=7
            Exit Function
        end if
    Wend
    MsgBox "Error parsing output of wmic os get Caption"
    self.Close
End Function

Answer 1

WMIC是WMI的封装，可以直接在VBS中使用；

function GetWinVersion
    dim WMI: set WMI = GetObject("winmgmts:\\.\root\cimv2")
    dim colResults: set colResults = WMI.ExecQuery("Select * from Win32_OperatingSystem")
    dim item
    for each item in colResults
        GetWinVersion = item.caption
    next
end function