为了进一步回答 MEYWD 的问题，我只想发布 C# 中的基本界面应该是什么样子。
[ComVisible(true), Guid("Put a GUID here")]
public interface IMSR
{
//Common Opos
[DispId(0x01)]
int CheckHealth([In] int lLevel);
[DispId(0x02)]
int ClaimDevice([In] int lTimeOut);
[DispId(0x03)]
int ClearInput();
[DispId(0x04)]
int ClearInputProperties();
[DispId(0x05)]
int ClearOutput();
[DispId(0x06)]
int CloseService();
[DispId(0x07)]
int COFreezeEvents([In, MarshalAs(UnmanagedType.VariantBool)] bool Freeze);
[DispId(0x08)]
int CompareFirmwareVersion([In, MarshalAs(UnmanagedType.BStr)] string FirmwareFileName, [In, Out]ref int pResult);
[DispId(0x09)]
int DirectIO([In] int lCommand, [In, Out] ref int pData, [In, Out, MarshalAs(UnmanagedType.BStr)] ref string pString);
[DispId(0x0A)]
int OpenService([In, MarshalAs(UnmanagedType.BStr)] string lpclDevClass, [In, MarshalAs(UnmanagedType.BStr)] string lpclDevName, [In, MarshalAs(UnmanagedType.IDispatch)] object lpDispatch);
[DispId(0x0B)]
int ReleaseDevice();
[DispId(0x0C)]
int ResetStatistics([In, MarshalAs(UnmanagedType.BStr)] string StatisticsBuffer);
[DispId(0x0D)]
int RetrieveStatistics([In, Out, MarshalAs(UnmanagedType.BStr)] ref string pStatisticsBuffer);
[DispId(0x0E)]
int UpdateFirmware([In, MarshalAs(UnmanagedType.BStr)] string FirmwareFileName);
[DispId(0x0F)]
int UpdateStatistics([In, MarshalAs(UnmanagedType.BStr)] string StatisticsBuffer);
[DispId(0x10)]
int GetPropertyNumber([In] int lPropIndex);
[DispId(0x11)]
string GetPropertyString([In] int lPropIndex);
[DispId(0x12)]
void SetPropertyNumber([In] int lPropIndex, [In] int nNewValue);
[DispId(0x13)]
void SetPropertyString([In] int lPropIndex, [In, MarshalAs(UnmanagedType.BStr)] string StringData);
//MSR Specific
[DispId(0x14)]
int AuthenticateDevice([In, MarshalAs(UnmanagedType.BStr)] string deviceResponse);
[DispId(0x15)]
int DeauthenticateDevice([In, MarshalAs(UnmanagedType.BStr)] string deviceResponse);
[DispId(0x16)]
int RetrieveCardProperty([In, MarshalAs(UnmanagedType.BStr)] string propertyName, [Out, MarshalAs(UnmanagedType.BStr)] out string cardProperty);
[DispId(0x17)]
int RetrieveDeviceAuthenticationData([In, Out, MarshalAs(UnmanagedType.BStr)] ref string challenge);
[DispId(0x18)]
int UpdateKey([In, MarshalAs(UnmanagedType.BStr)]string key,[In, MarshalAs(UnmanagedType.BStr)] string keyName);
[DispId(0x19)]
int WriteTracks([In] object data,[In] int timeout);
}
这是针对 MSR 的，但 CommonOPOS 方法在所有类型的设备上都是相同的。所以你唯一需要改变的是从 DispID 0x14 (20) 开始。我所做的是与 OPOS 文档比较他们放置的签名并将其转换为 C#。我以这种方式创建了大约 6 个 SO，并且在各种不同的场景中都可以正常工作。
另一个注意事项是在 OpenService 方法中。你会看到最后一个参数是一个对象。那是 Control 对象的实例。您需要做的是在您的项目中创建另一个接口，为您公开 COM 对象。为了坚持我的 MSR 示例，您将在这里提出。
[ComImport, Guid("CCB91121-B81E-11D2-AB74-0040054C3719"), InterfaceType(ComInterfaceType.InterfaceIsDual)]
public interface COPOSMSR
{
void SOData([In] int Status);
void SODirectIO([In] int EventNumber, [In, Out] ref int pData, [In, Out, MarshalAs(UnmanagedType.BStr)] ref string pStrIng);
void SOError([In] int ResultCode, [In] int ResultCodeExtended, [In] int ErrorLocus, [In, Out] ref int pErrorResponse);
void SOOutputCompleteDummy([In] int OutputID);
void SOStatusUpdate([In] int Data);
void SOProcessID([Out] out int pProcessID);
}
OPOS 源代码中的签名。如果您搜索源代码，您会看到这样的小注释..（来自 msr OPOS 源代码），这样您就知道要实现什么，以便触发事件。
c:\Program Files(x86)\Opos\oposSrc\zMSR\MSR.idl
[
object,
uuid(CCB91121-B81E-11D2-AB74-0040054C3719),
dual,
helpstring("IOPOSMSR 1.5 Interface"),
pointer_default(unique)
]
interface IOPOSMSR_1_5 : IDispatch
{
// Methods for use only by the Service Object
[id(1), hidden, helpstring("method SOData")] HRESULT SOData( [in] long Status );
[id(2), hidden, helpstring("method SODirectIO")] HRESULT SODirectIO( [in] long EventNumber, [in, out] long* pData, [in, out] BSTR* pString );
[id(3), hidden, helpstring("method SOError")] HRESULT SOError( [in] long ResultCode, [in] long ResultCodeExtended, [in] long ErrorLocus, [in, out] long* pErrorResponse );
[id(4), hidden, helpstring("method SOOutputCompleteDummy")] HRESULT SOOutputCompleteDummy( [in] long OutputID );
[id(5), hidden, helpstring("method SOStatusUpdate")] HRESULT SOStatusUpdate( [in] long Data );
[id(9), hidden, helpstring("method SOProcessID")] HRESULT SOProcessID( [out, retval] long* pProcessID );
有了这 2 个基本的东西，您就可以制作一个 SO.. 触发一个事件也非常容易。这是我作为测试的方法
public int OpenService(string lpclDevClass, string lpclDevName, object lpDispatch)
{
controlObject = (COPOSMSR)lpDispatch;
controlObject.SOData(1)//I just fired a Data Event
}
根据我的经验，在 C++ 中构建 SO 比在 C# 中更难。 C# 让更多的步骤变得超级简单。
一些不错的读物，足以让我开始学习。
COM 互操作第 1 部分：C# 客户端教程
http://msdn.microsoft.com/en-us/library/aa645736(v=vs.71).aspx
COM 互操作第 2 部分：C# 服务器教程
http://msdn.microsoft.com/en-us/library/aa645738(v=vs.71).aspx
COM 数据类型
https://msdn.microsoft.com/en-us/library/sak564ww%28v=vs.100%29.aspx