Question

您好，我目前的任务是转换通过第三方应用程序XFS.ocx与存折打印机通信的旧版Visual Basic 6应用程序（无源）。

根据我的研究，我可以让JACOB来执行此任务，但是遇到错误。谁能帮我？基于日志，我的程序可以实例化activeXcomponent并查看我要使用的方法的ID，但是当我尝试使用它们时，遇到错误。

在我用作示例的VB6代码示例中，方法 VersionRequired 需要两个整数作为参数，而 ApplicationID 仅需要一个字符串。

希望我只是在使用语法或JACOB方法上犯了一个错误，因为我只想使用Java JNI作为最后的手段。请注意，此应用程序将始终安装在Windows（7/10）工作站上，因此不会与其他操作系统兼容。

这是我的代码

ActiveXComponent activeXComponent = new ActiveXComponent("XFS.XFSCtrl.1");


System.out.println( activeXComponent.getIDOfName(activeXComponent, "ApplicationID"));
System.out.println( activeXComponent.getIDOfName(activeXComponent, "VersionRequired")); 
System.out.println( activeXComponent.getIDOfName(activeXComponent, "Description"));
System.out.println( activeXComponent.getIDOfName(activeXComponent, "Open"));

//Variant variant = activeXComponent.call(activeXComponent, "VersionRequired",1,1);
//Variant variant = activeXComponent.call(activeXComponent, "Description"); // added 072318 for David answer
//Variant variant = activeXComponent.getProperty("Description");
//activeXComponent.setProperty("Description", "Description");
//Variant variant = activeXComponent.get(activeXComponent,"Description");
activeXComponent.call(activeXComponent, "Description", "value");

这是我遇到的日志和错误

WARNING: JNI local refs: zu, exceeds capacity: zu
    at java.lang.System.initProperties(Native Method)
    at java.lang.System.initializeSystemClass(System.java:1166)
main: Loading library jacob-1.19-x86 using System.loadLibrary 
main: Loading library jacob-1.19-x86 using System.loadLibrary 
main: Loading library jacob-1.19-x86 using System.loadLibrary 
main: ComThread: before Init: 0
main: ComThread: after Init: 0
main: ROT: Automatic GC flag == false
main: ComThread: after ROT.addThread: 0
main: ROT: adding com.jacob.activeX.ActiveXComponent@11d50c0->com.jacob.activeX.ActiveXComponent table size prior to addition:0
13
31
1
21
main: ROT: adding ->com.jacob.com.Variant table size prior to addition:1
main: ROT: adding ->com.jacob.com.Variant table size prior to addition:2
main: ROT: adding ->com.jacob.com.Variant table size prior to addition:3
main: ROT: adding ->com.jacob.com.Variant table size prior to addition:4
main: ROT: adding ->com.jacob.com.Variant table size prior to addition:5
Exception in thread "main" com.jacob.com.ComFailException: A COM exception has been encountered:
At Invoke of: Description
Description: 8000ffff / Catastrophic failure

    at com.jacob.com.Dispatch.invokev(Native Method)
    at com.jacob.com.Dispatch.invokev(Dispatch.java:625)
    at com.jacob.com.Dispatch.callN(Dispatch.java:453)
    // at com.jacob.com.Dispatch.get(Dispatch.java:788) // added 072318 when using activeXComponent.get(activeXComponent,"Description")
    at com.jacob.com.Dispatch.call(Dispatch.java:541)
    // at com.jacob.com.Dispatch.call(Dispatch.java:529) // added 072318 for David answer
    at ph.com.bdo.icos.passbook.Launcher.main(Launcher.java:32)

我正在用作参考的VB代码

  With XFS1
        'Set up the versions required of XFS and SP
        .VersionRequired(WFS_VERSREQ_OLE, WFS_VERSREQ_LOW) = 1#   ' 2.00
        .VersionRequired(WFS_VERSREQ_OLE, WFS_VERSREQ_HIGH) = 2#  ' 2.00
        .VersionRequired(WFS_VERSREQ_API, WFS_VERSREQ_LOW) = 1.01
        .VersionRequired(WFS_VERSREQ_API, WFS_VERSREQ_HIGH) = 2#
        .VersionRequired(WFS_VERSREQ_SRV, WFS_VERSREQ_LOW) = 1.01
        .VersionRequired(WFS_VERSREQ_SRV, WFS_VERSREQ_HIGH) = 2.1
        'Get back one of the values for testing
        fResult = .VersionRequired(WFS_VERSREQ_API, WFS_VERSREQ_LOW)

        'Set and Get the Application property for testing
        .ApplicationID = "Passbook Printer"
        sAppID = .ApplicationID
        sDescription = .Description

Answer 1

我的猜测是Description是一个只读属性，而不是一个函数

因此您不能在其上使用 call ，并且此代码将出错，从而产生灾难性故障（COM错误始终晦涩难懂）：

activeXComponent.call(activeXComponent, "Description", "value");

如消息日志所述：

线程“ main”中的异常com.jacob.com.ComFailException：遇到COM异常：在调用：描述

，您也不能设置属性，因为它是只读的：

activeXComponent.setProperty("Description", "Description");

实际上，如果您正确阅读了VB6代码，则说明属性只是被读取

sDescription = XFS1.Description

尝试以下方法：

Variant v = activeXComponent.call(activeXComponent, "Description"); String description = v.toString();

调用.OCX方法的JACOB灾难性失败

1 个答案: