嗨，我当前的任务是转换通过第三方应用程序XFS.ocx与“存折打印机”进行通信的旧版Visual Basic 6应用程序(无源)。
根据我的研究，我可以让JACOB来完成此任务，但是遇到一个错误。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，我遇到了错误。
在示例VB6代码中，我使用 VersionRequired方法需要两个整数作为参数，而 ApplicationID 仅需要一个字符串。
希望我在使用的语法或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)
我正在用作引用的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
最佳答案
我的猜测是Description是一个只读属性，而不是一个函数
因此您无法对其进行调用，并且此代码会出错，从而导致灾难性的失败(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:调用时:说明
而且您也不能设置属性，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，则说明属性将被读取。
sDescription = XFS1.Description
尝试以下方法:
Variant v = activeXComponent.call(activeXComponent, "Description");String description = v.toString();