在Windows 7中从VBA宏运行java绕过System32 / SysWOW64 javaw.exe

Question

有没有办法绕过 32 位 java 版本(也许是在 VBA 中启动进程以调用 64 位版本 cmd、关闭 UAC 或其他类型的 tweek(被以下 VBA 代码"强制"(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)

这里的重点是我想共享我的宏并避免在收件人上放置额外的说明，所以我正在尝试对代码执行所有操作(我在 VBA 代码上使用后期绑定以避免手动设置引用之类的东西(。

调试过程

抛出了一个错误，所以我改用了以下行：

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

并得到错误Exception in thread "main" java.lang.UnsupportedClassVersionError: Unsupported major.minor version所以我检查了java -version并试图找出哪个java正在运行：

C:>where java
C:WindowsSystem32java.exe
C:Program FilesJava_anyJava.x.x.x_binjava.exe

我去了System32文件夹，那里没有java，但我知道重定向从那里发生到C:WindowsSysWOW64所以我将以前提取的java版本与C:WindowsSysWOW64java.exe -version进行了比较，它们匹配了。

之后，我检查了我的Outlook版本，结果证明是32位安装。这是一个提示，但主要是那个和任务管理器中cmd旁边的大*32.exe。我不知道 64 位 Outlook 是否会有所不同，或者由于 VBA 实现而会有所不同，但这就是我得出 VBA 的 Shell 函数导致 32 位 java 调用的结论。

Answer 1

通常有一个JAVA_HOME环境变量集。如果是这样，那么您可以执行以下操作：

Dim JavaExe As String
JavaExe = """" & Environ("JAVA_HOME") & "binjava.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。

Answer 2

Sam 的回答很棒，但我只是对用户进行更多设置感到不安，所以我编写了一些函数来检查 java 的版本并通知用户如果它不存在(无论如何都必须安装 java(，所以这是我的代码。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