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.NET Forum / .NET Framework / Interop / September 2004Problem calling c# com from c++ client?
Hi, I wrote a class library using c#, now I will use it in vc++6. I have registered my c# program as com and imported the .tlb file in vc6. Now I have some problems in using it: 1. How can I response events wroten c# in vc6. The event has custom parameters. For example: C# code: public delegate void MyCustomeEventHandler(object sender, MyCustomEventArgs e); public class MyClass { public event MyCustomEventHandler MyEvent; public OnMyEvent(object sender, MyCustomEventArgs e); } pubilc class MyCustomEventArgs { ErrorType errorType; // ErrorType is a enumeration. public ErrorType ErrorType {get {reuturn errorType;}set{errorType = value;}} } How can I use response the event in vc6 and process parameters. I will access parameter's property "ErrorType". 2. How can I access Collection object in vc6 com? C# code: public class MyObject { MyClassCollection classColl; public MyClassCollection ClassCollection {get{return classColl;}set{classColl = value;}} } public class MyClassCollection : ICollection { ArrayList al; public MyClass this(int index); public void Add(); public void Remove(); public void RemoveAt(); .......... } public class MyClass { public MyClass(); public string Property1; public int Property2; .......... } In vc6 program class MyObject is only visible. How can I access Property1 and Property2 in MyClass from MyObject class? > Hi, > [quoted text clipped - 88 lines] > In vc6 program class MyObject is only visible. How can I access > Property1 and Property2 in MyClass from MyObject class? Does the type library includes all classes? Check with OLE/COM viewer (oleview). From the C++ perspective it should be irrelevant that your COM object has been developed with C#, as long as all classes that you can possibly write with C# are supportable through COM. What counts is - what do the COM interfaces look like. OLE/COM viewer will display the IDL for the type library. To handle the events you will probably have to implement an event sink as for all COM objects, and advise your sink on the source interfaces called by your COM object. Check that the COM object actually lists source interfaces in the "coclass" declaration. Volker 9/7/2004 5:54:30 PM Volker Hilsheimer <unwatched@gmx.net> wrote in message <eGCaOCMlEHA.3896@TK2MSFTNGP15.phx.gbl> > "BlackHawk" <eliubo@sohu.com> wrote in message > news:eUPoW2LlEHA.1356@TK2MSFTNGP09.phx.gbl... > > Hi, > > I wrote a class library using c#, now I will use it in vc++6. > > I have registered my c# program as com and imported the .tlb file in > > vc6. > > Now I have some problems in using it: > > 1. How can I response events wroten c# in vc6. The event has custom > > parameters. For example: > > C# code: > > public delegate void MyCustomeEventHandler(object sender, > > MyCustomEventArgs e); > > public class MyClass > > { > > public event MyCustomEventHandler MyEvent; > > public OnMyEvent(object sender, MyCustomEventArgs e); > > } > > pubilc class MyCustomEventArgs > > { > > ErrorType errorType; // ErrorType is a enumeration. > > public ErrorType ErrorType > > {get {reuturn errorType;}set{errorType = value;}} > > } > > How can I use response the event in vc6 and process parameters. I > > will access parameter's property "ErrorType". > > 2. How can I access Collection object in vc6 com? > > C# code: > > public class MyObject > > { > > MyClassCollection classColl; > > public MyClassCollection ClassCollection > > {get{return classColl;}set{classColl = value;}} > > } > > public class MyClassCollection : ICollection > > { > > ArrayList al; > > public MyClass this(int index); > > public void Add(); > > public void Remove(); > > public void RemoveAt(); > > .......... > > } > > public class MyClass > > { > > public MyClass(); > > public string Property1; > > public int Property2; > > .......... > > } > > In vc6 program class MyObject is only visible. How can I access > > Property1 and Property2 in MyClass from MyObject class? > Does the type library includes all classes? Check with OLE/COM viewer > (oleview). > From the C++ perspective it should be irrelevant that your COM object has > been developed with C#, as long as all classes that you can possibly write > with C# are supportable through COM. What counts is - what do the COM > interfaces look like. OLE/COM viewer will display the IDL for the type > library. > To handle the events you will probably have to implement an event sink as > for all COM objects, and advise your sink on the source interfaces called > by your COM object. Check that the COM object actually lists source > interfaces in the "coclass" declaration. > Volker Thanks your response. The type library includes all classes and I have responsed event successfully(used ATL), but I don't know how to access event's parameters. This parameter is a class(MyCustomEventArgs) and has a enumeration property(ErrorType). How can I access this enumeration property? The second problems same as the first. The class includes a collection property not a enumeration. How can I access this collection property and its element in collection? Thanks > Thanks your response. > [quoted text clipped - 9 lines] > > Thanks When you import the type library you should get the enum defined. If this doesn't happen correctly then you will get compile errors... In C++, enums are passed as integers, maybe this helps? How to use the collection type depends on the API of the interface, i.e. in HRESULT _stdcall Images([out, retval] _IRImages** pRetVal); what is _IRImages? What does the type library importer make out of it? Volker 9/8/2004 5:39:19 PM Volker Hilsheimer <unwatched@gmx.net> wrote in message <O9XPYeYlEHA.556@tk2msftngp13.phx.gbl> > "BlackHawk" <eliubo@sohu.com> wrote in message > news:uOR1QDUlEHA.1376@TK2MSFTNGP12.phx.gbl... > > Thanks your response. > > The type library includes all classes and I have responsed event > > successfully(used ATL), but I don't know how to access event's > > parameters. This parameter is a class(MyCustomEventArgs) and has a > > enumeration property(ErrorType). How can I access this enumeration > > property? > > The second problems same as the first. The class includes a > > collection property not a enumeration. How can I access this > > collection property and its element in collection? > > Thanks > When you import the type library you should get the enum defined. If this > doesn't happen correctly then you will get compile errors... In C++, enums > are passed as integers, maybe this helps? > How to use the collection type depends on the API of the interface, i.e. > in > HRESULT _stdcall Images([out, retval] _IRImages** pRetVal); > what is _IRImages? What does the type library importer make out of it? > Volker Hi, Thanks for your help. 1. about enumeration: Follow is my vc code. void __stdcall CEventSink::OnDownload(VARIANT sender, _TransferEventArgs* e) { DISPID dispid; VARIANT vRet; DISPPARAMS dispparamsNoArgs = {NULL, NULL, 0, 0}; LPOLESTR lpStr[] = {L"TranferType"}; // TransferType is a property in _TransferEventArgs class. It is a enumeration. // _TransferEventArgs is a interface in idl. Its class is TransferEventArgs. e->GetIDsOfNames(IID_NULL,lpStr,1,LOCALE_SYSTEM_DEFAULT,&dispid); e->Invoke(dispid,IID_NULL,LOCALE_USER_DEFAULT,DISPATCH_PROPERTYGET, &dispparamsNoArgs,&vRet,NULL,NULL); if(vRet.iVal == 3) // It don't work now. How can I use vRet to compare with enumeration. { AfxMessageBox("hh",NULL,NULL); } } relative IDL: typedef [uuid(9DEDE979-708E-361A-B813-89674323B659), version(1.0), custom({0F21F359-AB84-41E8-9A78-36D110E6D2F9}, "IRCommunication. TransferType") ] enum { TransferType_None = 0, TransferType_Read = 1, TransferType_Write = 2, TransferType_Download = 3, // I want to use this enumeration. TransferType_Upload = 4 } TransferType; [ uuid(687D9CD8-F778-3067-BEDE-9EFE70E870F7), version(1.0), noncreatable, custom({0F21F359-AB84-41E8-9A78-36D110E6D2F9}, "IRCommunication. TransferEventArgs") ] coclass TransferEventArgs { [default] interface _TransferEventArgs; interface _Object; }; [ uuid(BA677050-17FB-3B60-9772-AA10B567E1AE), hidden, dual, custom({0F21F359-AB84-41E8-9A78-36D110E6D2F9}, "IRCommunication. TransferEventArgs") ] dispinterface _TransferEventArgs { properties: methods: }; Since I create com in C# using "ClassInterfaceType.None" so we can't see the method definition in _TransferEventArgs interface. 9/7/2004 5:54:30 PM Volker Hilsheimer <unwatched@gmx.net> wrote in message <eGCaOCMlEHA.3896@TK2MSFTNGP15.phx.gbl> > "BlackHawk" <eliubo@sohu.com> wrote in message > news:eUPoW2LlEHA.1356@TK2MSFTNGP09.phx.gbl... > > Hi, > > I wrote a class library using c#, now I will use it in vc++6. > > I have registered my c# program as com and imported the .tlb file in > > vc6. > > Now I have some problems in using it: > > 1. How can I response events wroten c# in vc6. The event has custom > > parameters. For example: > > C# code: > > public delegate void MyCustomeEventHandler(object sender, > > MyCustomEventArgs e); > > public class MyClass > > { > > public event MyCustomEventHandler MyEvent; > > public OnMyEvent(object sender, MyCustomEventArgs e); > > } > > pubilc class MyCustomEventArgs > > { > > ErrorType errorType; // ErrorType is a enumeration. > > public ErrorType ErrorType > > {get {reuturn errorType;}set{errorType = value;}} > > } > > How can I use response the event in vc6 and process parameters. I > > will access parameter's property "ErrorType". > > 2. How can I access Collection object in vc6 com? > > C# code: > > public class MyObject > > { > > MyClassCollection classColl; > > public MyClassCollection ClassCollection > > {get{return classColl;}set{classColl = value;}} > > } > > public class MyClassCollection : ICollection > > { > > ArrayList al; > > public MyClass this(int index); > > public void Add(); > > public void Remove(); > > public void RemoveAt(); > > .......... > > } > > public class MyClass > > { > > public MyClass(); > > public string Property1; > > public int Property2; > > .......... > > } > > In vc6 program class MyObject is only visible. How can I access > > Property1 and Property2 in MyClass from MyObject class? > Does the type library includes all classes? Check with OLE/COM viewer > (oleview). > From the C++ perspective it should be irrelevant that your COM object has > been developed with C#, as long as all classes that you can possibly write > with C# are supportable through COM. What counts is - what do the COM > interfaces look like. OLE/COM viewer will display the IDL for the type > library. > To handle the events you will probably have to implement an event sink as > for all COM objects, and advise your sink on the source interfaces called > by your COM object. Check that the COM object actually lists source > interfaces in the "coclass" declaration. > Volker This is my idl content: This is enumeration definition in type library. typedef [uuid(9DEDE979-708E-361A-B813-89674323B659), version(1.0), custom({0F21F359-AB84-41E8-9A78-36D110E6D2F9}, "IRCommunication. TransferType") ] enum { TransferType_None = 0, TransferType_Read = 1, TransferType_Write = 2, TransferType_Download = 3, TransferType_Upload = 4 } TransferType; This is collection property: HRESULT _stdcall Images([out, retval] _IRImages** pRetVal); "_IRImages" is a collection class in type library.
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