从Windows 7中的VBA宏绕过System32 / SysWOW64 javaw.exe运行Java

时间:2018-10-24 16:55:42

标签: java vba shell windows-7 32bit-64bit

是否有一种绕过32位Java版本的方法(也许是在VBA中启动过程以调用64位版本cmd,关闭UAC或其他tweek的另一种方式),由以下VBA代码强制执行(这只是一个假设,我在下面解释调试过程):

handleDbl = Shell("javaw -cp theJar.jar com.java.SampleClass", vbNormalFocus)

这里的要点是我想共享我的宏,避免在接收者身上放置额外的指令,所以我试图对代码做所有事情(我在VBA代码上使用后期绑定,以避免手动设置“引用”,种东西)。

调试过程

抛出了一个错误,所以我改用以下行:

handleDbl = Shell("cmd /k java -cp theJar.jar com.java.SampleClass", vbNormalFocus)

并收到错误Exception in thread "main" java.lang.UnsupportedClassVersionError: Unsupported major.minor version,所以我检查了java -version并试图找出运行哪个Java:

C:\>where java
C:\Windows\System32\java.exe
C:\Program Files\Java\_anyJava.x.x.x_\bin\java.exe

我去了System32文件夹,那里没有Java,但是我知道redirection从那里发生到C:\Windows\SysWOW64,所以我将先前提取的Java版本与C:\Windows\SysWOW64\java.exe -version进行了比较。他们匹配了。

之后,我检查了我的Outlook版本,结果发现它是32位安装。这只是一个提示,但主要是任务管理器中cmd.exe旁边的那个大<​​strong> * 32 。我不知道64位Outlook是否会有所作为,还是因为VBA实现而会有所不同,但这就是我得出的结论,即VBA的Shell函数引起32位Java调用。

2 个答案:

答案 0 :(得分:1)

通常会设置一个JAVA_HOME环境变量。如果是这样,那么您可以执行以下操作:

Dim JavaExe As String
JavaExe = """" & Environ("JAVA_HOME") & "\bin\java.exe"""
handleDbl = Shell("cmd /k " & JavaExe & " -cp theJar.jar com.java.SampleClass", vbNormalFocus)

如果未设置,则必须在编译命令之前通过一些搜索找到它。

答案 1 :(得分:0)

Sam的答案很好,但我只是对用户进行更多设置感到不安,因此我编写了一些函数来检查Java的版本,并在不存在的情况下通知用户(必须在其中安装Java)大小写),这是我的代码。它可能包含一些有用的东西。

Private Function IsJavaAvailable(ByVal displayMessage As Boolean, Optional ByVal isJavaMandatory As Boolean) As Boolean
    Dim availability As Boolean
    Dim minJavaVersion As Integer
    minJavaVersion = 8

    'isJavaSetup is a global variable
    If (Not isJavaSetup) Then
        javawPathQuoted = GetMinimumJavaVersion(minJavaVersion)
        If StrComp(javawPathQuoted, "") <> 0 Then
            isJavaSetup = True
        End If
        SetGlobalVars
    End If

    If javawPathQuoted = Empty Then
        availability = False
    Else
        availability = True
    End If

    If (displayMessage) Then
        If (isJavaMandatory) Then
            If Not availability Then
                MsgBox "This functionality is NOT available without Java " & minJavaVersion & "." & _
                vbNewLine & vbNewLine & _
                "Please install Java " & minJavaVersion & " or higher.", vbCritical, _
                "Mimimum Version Required: Java " & minJavaVersion
            End If
        Else
            If Not availability Then
                MsgBox "Some features of this functionality were disabled." & _
                vbNewLine & vbNewLine & _
                "Please install Java " & minJavaVersion & " or higher.", vbExclamation, _
                "Mimimum Version Required: Java " & minJavaVersion
            End If

        End If
    End If

    IsJavaAvailable = availability

End Function

Private Function GetMinimumJavaVersion(ByVal javaMinimumMajorVersionInt As Integer) As String

    'Run a shell command, returning the output as a string
    Dim commandStr As String
    Dim javawPathVar As Variant
    Dim javaPathStr As Variant
    Dim javaVersionStr As String
    Dim javaMajorVersionInt As Integer

    Dim detectedJavaPaths As Collection
    Dim javaVersionElements As Collection
    Dim javaVersionOutput As Collection
    Dim detectedJavaVersions As Collection

    Dim suitableJavawPath As String

    'Check available javaw executables in the SO
    commandStr = "where javaw"
    Set detectedJavaPaths = GetCommandOutput(commandStr)
    Set detectedJavaVersions = New Collection

    For Each javawPathVar In detectedJavaPaths

        'Look for java.exe instead of javaw.exe by substituting it in path
        '  javaw.exe does NOT return version output like java.exe
        javaPathStr = StrReverse(Replace(StrReverse(javawPathVar), StrReverse("javaw.exe"), StrReverse("java.exe"), , 1))
        commandStr = """" & javaPathStr & """" & " -version"
        Set javaVersionOutput = GetCommandOutput(commandStr)
        javaVersionStr = javaVersionOutput.item(1)

        Debug.Print "Getting java version: ", commandStr
        Debug.Print "Version detected: "; javaVersionStr

        Set javaVersionElements = SplitOnDelimiter(javaVersionStr, " ")

        'Check that output is not an error or something else
        'java version "1.8.0_75"
        If javaVersionElements.Count > 2 Then
            If StrComp(javaVersionElements.item(1), "java", vbTextCompare) = 0 Then
                If StrComp(javaVersionElements.item(2), "version", vbTextCompare) = 0 Then
                    detectedJavaVersions.Add javaVersionStr
                    'Remove quotes from "1.8.0_75", split on '.', get 2nd item (java major version) and cast it to Integer
                    javaMajorVersionInt = CInt(SplitOnDelimiter(SplitOnDelimiter(javaVersionElements.item(3), """").item(1), ".").item(2))
                    'JAR will only run in Java 8 or later
                    If (javaMajorVersionInt >= javaMinimumMajorVersionInt) Then
                        'Validate that "javaw.exe" exists since the validation was made with "java.exe"
                        Debug.Print "Verifying if javaw.exe exists: ", javawPathVar
                        If Len(Dir(javawPathVar)) > 0 Then
                            suitableJavawPath = javawPathVar
                            Debug.Print "A suitable javaw.exe version found: ", suitableJavawPath
                            Exit For
                        End If
                    End If
                End If
            End If
        End If
    Next javawPathVar

    GetMinimumJavaVersion = suitableJavawPath

End Function

Private Function GetCommandOutput(ByRef commandStr As String) As Collection

    'Run a shell command, returning the output as a string
    Dim shellObj As Object
    Set shellObj = CreateObject("WScript.Shell")

    'run command
    Dim wshScriptExecObj As Object
    Dim stdOutObj As Object
    Dim stdErrObj As Object
    Set wshScriptExecObj = shellObj.Exec(commandStr)
    Set stdOutObj = wshScriptExecObj.StdOut
    Set stdErrObj = wshScriptExecObj.StdErr

    'handle the results as they are written to and read from the StdOut object
    Dim fullOutputCollection As Collection
    Set fullOutputCollection = New Collection

    Dim lineStr As String
    While Not stdOutObj.AtEndOfStream
        lineStr = stdOutObj.ReadLine
        If lineStr <> "" Then
            fullOutputCollection.Add lineStr
        End If
    Wend

    If fullOutputCollection.Count = 0 Then
        While Not stdErrObj.AtEndOfStream
            lineStr = stdErrObj.ReadLine
            If lineStr <> "" Then
                fullOutputCollection.Add lineStr
            End If
        Wend
    End If



    Set GetCommandOutput = fullOutputCollection

End Function