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C# - 编写COM服务器 - 属性映射到方法

c#.netcomvb6idl
3
我们正在尝试替换最初为VB6应用程序编写的COM服务器，但我们无法访问源代码。由于某种原因，VB6应用程序可以调用我们的构造函数，但随后出现以下错误：System Error &H80004002. No such interface supported. 我猜测是在使用QueryInterface时尝试获取接口时出了问题。我们已通过regasm /tlb和gacutil正确地发送了程序集，但我注意到一些奇怪的事情。我打开了regasm为我们的程序集生成的.tlb文件，并注意到我的接口上的所有属性都显示为方法。这是.NET工具正在做的吗？这会导致我的问题吗？以下是原始文件的完整tlb定义：
// Generated .IDL file (by the OLE/COM Object Viewer)
// 
// typelib filename: UtopiaKeyboard.tlb

[
  uuid(9B4E1840-FF65-11CF-AA2E-0020AFA49D5A),
  version(1.0),
  helpstring("OPOS POSKeyboard OLE Control")
]
library POSKEYBOARDLib
{
    // TLib :     // TLib : OLE Automation : {00020430-0000-0000-C000-000000000046}
    importlib("STDOLE2.TLB");

    // Forward declare all types defined in this typelib
    dispinterface _DPOSKeyboard;
    dispinterface _DPOSKeyboardEvents;

    [
      uuid(9B4E1841-FF65-11CF-AA2E-0020AFA49D5A),
      helpstring("Dispatch interface for OPOS POSKeyboard OLE Control"),
      hidden
    ]
    dispinterface _DPOSKeyboard {
        properties:
            [id(0x00000001)            
]
            BSTR CheckHealthText;
            [id(0x00000002)            
]
            VARIANT_BOOL Claimed;
            [id(0x00000003)            
]
            VARIANT_BOOL DataEventEnabled;
            [id(0x00000004)            
]
            VARIANT_BOOL DeviceEnabled;
            [id(0x00000005)            
]
            VARIANT_BOOL FreezeEvents;
            [id(0x00000006)            
]
            long ResultCode;
            [id(0x00000007)            
]
            long ResultCodeExtended;
            [id(0x00000008)            
]
            long State;
            [id(0x00000009)            
]
            BSTR ControlObjectDescription;
            [id(0x0000000a)            
]
            long ControlObjectVersion;
            [id(0x0000000b)            
]
            BSTR ServiceObjectDescription;
            [id(0x0000000c)            
]
            long ServiceObjectVersion;
            [id(0x0000000d)            
]
            BSTR DeviceDescription;
            [id(0x0000000e)            
]
            BSTR DeviceName;
            [id(0x0000000f)            
]
            long POSKeyData;
            [id(0x0000001a)            
]
            VARIANT_BOOL AutoDisable;
            [id(0x0000001b)            
]
            long BinaryConversion;
            [id(0x0000001c)            
]
            long DataCount;
            [id(0x0000001d)            
]
            VARIANT_BOOL CapKeyUp;
            [id(0x0000001e)            
]
            long EventTypes;
            [id(0x0000001f)            
]
            long POSKeyEventType;
            [id(0x00000021)            
]
            long CapPowerReporting;
            [id(0x00000022)            
]
            long PowerNotify;
            [id(0x00000023)            
]
            long PowerState;
        methods:
            [id(0x00000010)]
            long Open([in] BSTR DeviceName);
            [id(0x00000011)]
            long Close();
            [id(0x00000012)]
            long Claim([in] long Timeout);
            [id(0x00000013)]
            long Release();
            [id(0x00000014)]
            long CheckHealth([in] long Level);
            [id(0x00000015)]
            long ClearInput();
            [id(0x00000016)]
            long DirectIO(
                            [in] long Command, 
                            [in, out] long* pData, 
                            [in, out] BSTR* pString);
            [id(0x00000017)]
            void SOData([in] long Status);
            [id(0x00000018)]
            void SODirectIO(
                            [in] long EventNumber, 
                            [in, out] long* pData, 
                            [in, out] BSTR* pString);
            [id(0x00000019)]
            void SOError(
                            [in] long ResultCode, 
                            [in] long ResultCodeExtended, 
                            [in] long ErrorLocus, 
                            [in, out] long* pErrorResponse);
            [id(0x00000020)]
            long SOProcessID();
            [id(0x00000024)]
            void SOStatusUpdate([in] long Status);
    };

    [
      uuid(9B4E1842-FF65-11CF-AA2E-0020AFA49D5A),
      helpstring("Event interface for OPOS POSKeyboard OLE Control")
    ]
    dispinterface _DPOSKeyboardEvents {
        properties:
        methods:
            [id(0x00000001)]
            void DataEvent([in] long Status);
            [id(0x00000002)]
            void DirectIOEvent(
                            [in] long EventNumber, 
                            [in, out] long* pData, 
                            [in, out] BSTR* pString);
            [id(0x00000003)]
            void ErrorEvent(
                            [in] long ResultCode, 
                            [in] long ResultCodeExtended, 
                            [in] long ErrorLocus, 
                            [in, out] long* pErrorResponse);
            [id(0x00000004)]
            void StatusUpdateEvent([in] long Status);
    };

    [
      uuid(9B4E1843-FF65-11CF-AA2E-0020AFA49D5A),
      helpstring("OPOS POSKeyboard OLE Control"),
      control
    ]
    coclass POSKeyboard {
        [default] dispinterface _DPOSKeyboard;
        [default, source] dispinterface _DPOSKeyboardEvents;
    };
};

这是我的 .Net 程序集生成的 tlb 文件：
// Generated .IDL file (by the OLE/COM Object Viewer)
// 
// typelib filename: POSKEYBOARDLib.tlb

[
  uuid(9B4E1840-FF65-11CF-AA2E-0020AFA49D5A),
  version(1.0),
  custom(90883F05-3D28-11D2-8F17-00A0C9A6186D, "POSKEYBOARDLib, Version=1.0.0.0, Culture=neutral, PublicKeyToken=5824208931aaf68b")

]
library POSKEYBOARDLib
{
    // TLib :     // TLib : mscorlib.dll : {BED7F4EA-1A96-11D2-8F08-00A0C9A6186D}
    importlib("mscorlib.tlb");
    // TLib : OLE Automation : {00020430-0000-0000-C000-000000000046}
    importlib("STDOLE2.TLB");

    // Forward declare all types defined in this typelib
    dispinterface _DPOSKeyboard;
    dispinterface _DPOSKeyboardEvents;

    [
      uuid(9B4E1841-FF65-11CF-AA2E-0020AFA49D5A),
      version(1.0),
      custom(0F21F359-AB84-41E8-9A78-36D110E6D2F9, "POSKEYBOARDLib._DPOSKeyboard")    

    ]
    dispinterface _DPOSKeyboard {
        properties:
        methods:
            [id(0x00000001), propget]
            BSTR CheckHealthText();
            [id(0x00000001), propput]
            void CheckHealthText([in] BSTR rhs);
            [id(0x00000002), propget]
            VARIANT_BOOL Claimed();
            [id(0x00000002), propput]
            void Claimed([in] VARIANT_BOOL rhs);
            [id(0x00000003), propget]
            VARIANT_BOOL DataEventEnabled();
            [id(0x00000003), propput]
            void DataEventEnabled([in] VARIANT_BOOL rhs);
            [id(0x00000004), propget]
            VARIANT_BOOL DeviceEnabled();
            [id(0x00000004), propput]
            void DeviceEnabled([in] VARIANT_BOOL rhs);
            [id(0x00000005), propget]
            VARIANT_BOOL FreezeEvents();
            [id(0x00000005), propput]
            void FreezeEvents([in] VARIANT_BOOL rhs);
            [id(0x00000006), propget]
            long ResultCode();
            [id(0x00000006), propput]
            void ResultCode([in] long rhs);
            [id(0x00000007), propget]
            long ResultCodeExtended();
            [id(0x00000007), propput]
            void ResultCodeExtended([in] long rhs);
            [id(0x00000008), propget]
            long State();
            [id(0x00000008), propput]
            void State([in] long rhs);
            [id(0x00000009), propget]
            BSTR ControlObjectDescription();
            [id(0x00000009), propput]
            void ControlObjectDescription([in] BSTR rhs);
            [id(0x0000000a), propget]
            long ControlObjectVersion();
            [id(0x0000000a), propput]
            void ControlObjectVersion([in] long rhs);
            [id(0x0000000b), propget]
            BSTR ServiceObjectDescription();
            [id(0x0000000b), propput]
            void ServiceObjectDescription([in] BSTR rhs);
            [id(0x0000000c), propget]
            long ServiceObjectVersion();
            [id(0x0000000c), propput]
            void ServiceObjectVersion([in] long rhs);
            [id(0x0000000d), propget]
            BSTR DeviceDescription();
            [id(0x0000000d), propput]
            void DeviceDescription([in] BSTR rhs);
            [id(0x0000000e), propget]
            BSTR DeviceName();
            [id(0x0000000e), propput]
            void DeviceName([in] BSTR rhs);
            [id(0x0000000f), propget]
            long POSKeyData();
            [id(0x0000000f), propput]
            void POSKeyData([in] long rhs);
            [id(0x00000010)]
            long Open([in] BSTR DeviceName);
            [id(0x00000011)]
            long Close();
            [id(0x00000012)]
            long Claim([in] long Timeout);
            [id(0x00000013)]
            long Release();
            [id(0x00000014)]
            long CheckHealth([in] long Level);
            [id(0x00000015)]
            long ClearInput();
            [id(0x00000016)]
            long DirectIO(
                            [in] long Command, 
                            [in, out] long* pData, 
                            [in, out] BSTR* pString);
            [id(0x00000017)]
            void SOData([in] long Status);
            [id(0x00000018)]
            void SODirectIO(
                            [in] long EventNumber, 
                            [in, out] long* pData, 
                            [in, out] BSTR* pString);
            [id(0x00000019)]
            void SOError(
                            [in] long ResultCode, 
                            [in] long ResultCodeExtended, 
                            [in] long ErrorLocus, 
                            [in, out] long* pErrorResponse);
            [id(0x0000001a), propget]
            VARIANT_BOOL AutoDisable();
            [id(0x0000001a), propput]
            void AutoDisable([in] VARIANT_BOOL rhs);
            [id(0x0000001b), propget]
            long BinaryConversion();
            [id(0x0000001b), propput]
            void BinaryConversion([in] long rhs);
            [id(0x0000001c), propget]
            long DataCount();
            [id(0x0000001c), propput]
            void DataCount([in] long rhs);
            [id(0x0000001d), propget]
            VARIANT_BOOL CapKeyUp();
            [id(0x0000001d), propput]
            void CapKeyUp([in] VARIANT_BOOL rhs);
            [id(0x0000001e), propget]
            long EventTypes();
            [id(0x0000001e), propput]
            void EventTypes([in] long rhs);
            [id(0x0000001f), propget]
            long POSKeyEventType();
            [id(0x0000001f), propput]
            void POSKeyEventType([in] long rhs);
            [id(0x00000020)]
            long SOProcessID();
            [id(0x00000021), propget]
            long CapPowerReporting();
            [id(0x00000021), propput]
            void CapPowerReporting([in] long rhs);
            [id(0x00000022), propget]
            long PowerNotify();
            [id(0x00000022), propput]
            void PowerNotify([in] long rhs);
            [id(0x00000023), propget]
            long PowerState();
            [id(0x00000023), propput]
            void PowerState([in] long rhs);
            [id(0x00000024)]
            void SOStatusUpdate([in] long Status);
    };

    [
      uuid(9B4E1842-FF65-11CF-AA2E-0020AFA49D5A),
      version(1.0),
      custom(0F21F359-AB84-41E8-9A78-36D110E6D2F9, "POSKEYBOARDLib._DPOSKeyboardEvents")    

    ]
    dispinterface _DPOSKeyboardEvents {
        properties:
        methods:
            [id(0x00000001)]
            void DataEvent([in] long Status);
            [id(0x00000002)]
            void DirectIOEvent(
                            [in] long EventNumber, 
                            [in, out] long* pData, 
                            [in, out] BSTR* pString);
            [id(0x00000003)]
            void ErrorEvent(
                            [in] long ResultCode, 
                            [in] long ResultCodeExtended, 
                            [in] long ErrorLocus, 
                            [in, out] long* pErrorResponse);
            [id(0x00000004)]
            void StatusUpdateEvent([in] long Status);
    };

    [
      uuid(9B4E1843-FF65-11CF-AA2E-0020AFA49D5A),
      version(1.0),
      custom(0F21F359-AB84-41E8-9A78-36D110E6D2F9, "POSKEYBOARDLib.POSKeyboard")
    ]
    coclass POSKeyboard {
        interface _Object;
        [default] dispinterface _DPOSKeyboard;
        [default, source] dispinterface _DPOSKeyboardEvents;
    };
};

我的属性被列为方法...即使我添加了PreserveSig，它仍然编写2个方法而不是将它们变为属性。

我应该尝试做哪些更改才能使它与原始tlb相同？或者至少让它工作。

更新：我发现我的事件接口上没有DispIdAttribute。已解决，但VB6应用程序仍然出现相同的错误。

3个回答
2

当使用COM接口时，不可以与IUnknown方法名称（QueryInterface、AddRef和Release）重叠。

更新

如果要让C#类生成一个dispinteface（即OLE自动化绑定的IDisptach接口），请在类上使用ClassInterfaceAttribute进行装饰：

[ClassInterface(ClassInterfaceType.AutoDispatch)]
class myClass
{
   public string Foo {get;}
   public long Bar();
}

这将生成自动化属性Foo和方法Bar，而不是原始的COM接口。
不知何故，原始应用程序可以这样做...如果我使用OleView.exe打开他们的ocx文件，它明显有一个名为Release()的方法。我会为您发布原始tlb文件。 - jonathanpeppers
这是一个dispinterface，因此使用IDispatch::Invoke(0x00000013，...)调用“Release”。我不认为还有一个扩展IDispatch并具有自己的“Release”的IDPOSKeyboard，毕竟COM接口是vtable，据我所知，vtable无法支持此行为。已经有一段时间没有做过任何OLE/COM工作了，所以可能在此期间忘记了一些东西... - Remus Rusanu
你可能需要在 C# 类上添加 [ClassInterface(AutoDual)] 或 [ClassInterface(AutoDispatch)] 属性，以便它也生成一个 IDispatch 接口，而不是一个普通的 COM 接口。 - Remus Rusanu
1
我最初使用tlbimp和VS 2008中的对象浏览器来生成我的类作为起点。 - jonathanpeppers
0

好的，我解决了...

我使用VB6反编译器对目标应用程序进行了反编译，并将其导出为VB6项目。

使用VS 2008打开它，升级到VB .Net。

运行应用程序，看到错误“无法转换为IOleObject”。

进行了谷歌搜索，发现System.Windows.Forms.Control实现了这个接口，因此从Control继承解决了我的问题。

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