C＃COM类 - DISP_E_UNKNOWNNAME [英] C# COM Class - DISP_E_UNKNOWNNAME

问题描述

我已经在C＃中声明了一个COM可见类。代码如下：

  [ComVisible（true）] 
 public class AComVisibleClass：TheParentClass 
 { 
 public bool SomeFunc（string id）
 {
 return true; 
} 
 
} 
  

此类由工厂实例化

但是如果我尝试在VB脚本文件中访问，则 DISP_E_UNKNOWNNAME 异常抛出。

这是我们在这里工作的一个预先存在的库的一个新类。所有其他类都可以通过COM访问。整个库被编译成单个装配文件。我已经注册新的程序集使用 regasm ，但我仍然得到这个异常。

我试图调试COM调用使用VS2008。工厂类似乎能够实例化 AComVisibleClass 。只有当工厂尝试执行 SomeFunc 时，才会抛出上述异常。

我知道这听起来有点？）bit vague，但我不能公开真正的代码在这里。如果有人需要更多信息，请问我。

解决方案

我可以想到这个问题的三个可能的原因：

原因1：在CreateObject中使用错误的名称：

我想你的VBScript代码调用
像
这样：

 设置obj = CreateObject（MyLibrary.AComVisibleClass）
  

如果这是正确的，请打开注册表编辑器，并检查 HKEY_CLASSES_ROOT 键包含一个名为 MyLibrary.AComVisibleClass 的子键。
如果没有，那么你的库名可能不同于你的预期。搜索注册表 AComVisibleClass 以查找正确的库名称。

原因2：64位问题：

如果在64位操作系统上出现问题，原因可能是您的VBScript作为32位进程运行，C＃COM

原因3：错误的函数名称：

您可能在脚本中使用错误的函数名称，例如 obj.SomeFnc（1）而不是 obj.SomeFunc（1），或者您选择的函数名称是保留在VBScript中的关键字，或包含异常字符。

I have declared a COM visible class in C#. The code is as follows:

[ComVisible(true)]
public class AComVisibleClass : TheParentClass
{
    public bool SomeFunc(string id)
    {
        return true;
    }

}

This class is instantiated by a factory class, also COM accessible.

But if I try to access in a VB script file, a DISP_E_UNKNOWNNAME exception is thrown.

This is a new class on a pre-existent library we have here at work. All other classes are accessible through COM. The whole library is compiled into a single assembly file. I have registered the new assembly using regasm, but I still get this exception.

I've tried to debug the COM call using VS2008. The factory class seems to be able to instantiate the AComVisibleClass. The aforementioned exception is thrown only when the factory tries to execute SomeFunc.

I know this may sound a little(?) bit vague, but I cannot expose the real code here. If someone need more information, please ask me.

解决方案

I can think of three possible reasons for this problem:

Reason 1: Wrong name used in CreateObject:

I suppose that your VBScript code calls something like this:

 Set obj = CreateObject("MyLibrary.AComVisibleClass")

If this is correct, then please open the registry editor and check whether the HKEY_CLASSES_ROOT key contains a subkey called MyLibrary.AComVisibleClass. If it does not, then your library name possibly is different than you expected. Search the registry for AComVisibleClass to find the correct library name.

Reason 2: 64-bit issues:

If the problem happens on a 64-bit operating system, the reason could be that your VBScript runs as a 32-bit process and the C# COM DLL is 64-bit or vice versa.

Reason 3: Wrong function name:

You might be using the wrong function name in the script, e.g. obj.SomeFnc(1) instead of obj.SomeFunc(1), or the function name you have chosen is a reserved keyword in VBScript or it contains unusual characters.

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