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dotnet interop : Invoking C# object from C++ DLL
I wish to provide a C++ DLL interface for non-framework clients to access a
C# DLL - is this possible? I have had some limited success by using a pimpl idiom to cross from unmanaged to managed - but anything more than a simple message output yields an exception. I cannot debug past the C++/C# boundary. I have put this question to Microsoft support and while they tell me that I SHOULD be able to do this and I SHOULD be able to debug across the boundary they cannot tell me how to do it although they have had my sample code for two days now. Can anyone shed some light on this? Thanks for any help.
[quoted text, click to view] "Dmytro Lapshyn [MVP]" <x-code@no-spam-please.hotpop.com> wrote in message news:O%23JLiL8XGHA.4652@TK2MSFTNGP04.phx.gbl... > Hi Daniel, > > Consider making your C# class library COM-visible. I think all mainstream > programming languages are able to consume COM nowadays, and it's fairly > easy to do since COM visibility is supported by .NET Framework and SDK > tools. > > "Daniel F. Devine" <ddevine@totsys.com> wrote in message > news:uvJpqS0XGHA.4120@TK2MSFTNGP03.phx.gbl... >>I wish to provide a C++ DLL interface for non-framework clients to access >>a >> C# DLL - is this possible? I have had some limited success by using a >> pimpl >> idiom to cross from unmanaged to managed - but anything more than a >> simple >> message output yields an exception. I cannot debug past the C++/C# >> boundary. >> >> I have put this question to Microsoft support and while they tell me that >> I SHOULD be able to do this and I SHOULD be able to debug across the >> boundary they cannot tell me how to do it although they have had my >> sample code for two days now. Can anyone shed some light on this? >> >> Thanks for any help. >> >> > Thanks for the reply. Actually I can do this with COM but was looking for a solution that avoided COM for deployment reasons. I am not sure if this can be done BUT Microsoft Tech support ensures me that it can be done although to date they have not shown me why my sample stub blows up with an EEFileLoadException. There seems to be virtually no documentation on this error that I can find. If it can't be done that would be most helpful to know as I would stiop wasting my time and look for another solution.
[quoted text, click to view] "Dmytro Lapshyn [MVP]" <x-code@no-spam-please.hotpop.com> wrote in message news:OAvCTQ9XGHA.3972@TK2MSFTNGP04.phx.gbl... > Can you please post your code that gives you the EEFileLoadException here? > > >> Thanks for the reply. Actually I can do this with COM but was looking >> for a solution that avoided COM for deployment reasons. I am not sure if >> this can be done BUT Microsoft Tech support ensures me that it can be >> done although to date they have not shown me why my sample stub blows up >> with an EEFileLoadException. There seems to be virtually no >> documentation on this error that I can find. If it can't be done that >> would be most helpful to know as I would stiop wasting my time and look >> for another solution. > Sure - but first I'll psedocode it because even as a small testbed it is somewhat complex C++ DLL interface exposes invokeCrystal invokeCrystal is in a C++ compilation unit - pure C++ ManagedReport *mr = new ManagedReport(); mr->ViewReport(); delete mr; ManagedReport object is defined in a separate compilation unit compiled with /clr ViewReport() { ManagedCrystalObject ^mo = gcnew ManagedCrystalObject } In the C# class ManagedCrystalObject a Winform hosting the Crystal Viewer is to be displayed. In the invocation of ViewReport I get the exception : EEFileLoadException Also to note is that I cannot step into the managed code unit from the unmanged code unit. If you still need the code I will upload it. Thanks for your responses
Hi Daniel,
Consider making your C# class library COM-visible. I think all mainstream programming languages are able to consume COM nowadays, and it's fairly easy to do since COM visibility is supported by .NET Framework and SDK tools. [quoted text, click to view] "Daniel F. Devine" <ddevine@totsys.com> wrote in message
news:uvJpqS0XGHA.4120@TK2MSFTNGP03.phx.gbl... >I wish to provide a C++ DLL interface for non-framework clients to access a > C# DLL - is this possible? I have had some limited success by using a > pimpl > idiom to cross from unmanaged to managed - but anything more than a simple > message output yields an exception. I cannot debug past the C++/C# > boundary. > > I have put this question to Microsoft support and while they tell me that > I SHOULD be able to do this and I SHOULD be able to debug across the > boundary they cannot tell me how to do it although they have had my sample > code for two days now. Can anyone shed some light on this? > > Thanks for any help. > >
Can you please post your code that gives you the EEFileLoadException here?
[quoted text, click to view] > Thanks for the reply. Actually I can do this with COM but was looking for
> a solution that avoided COM for deployment reasons. I am not sure if this > can be done BUT Microsoft Tech support ensures me that it can be done > although to date they have not shown me why my sample stub blows up with > an EEFileLoadException. There seems to be virtually no documentation on > this error that I can find. If it can't be done that would be most > helpful to know as I would stiop wasting my time and look for another > solution.
Now I see you are using the IJW technology, and I don't have any experience
with this one :-( What I can tell is: The EEFileLoadException error means that the CLR could locate the assembly with the managed class, but couldn't load it for some reason. This link might help: http://doc.trolltech.com/3.3/activeqt-dotnet.html Also, do a Google search on IJW. [quoted text, click to view] "Daniel F. Devine" <ddevine@totsys.com> wrote in message
news:%23NctRg9XGHA.4248@TK2MSFTNGP05.phx.gbl... > > "Dmytro Lapshyn [MVP]" <x-code@no-spam-please.hotpop.com> wrote in message > news:OAvCTQ9XGHA.3972@TK2MSFTNGP04.phx.gbl... >> Can you please post your code that gives you the EEFileLoadException >> here? >> >> >>> Thanks for the reply. Actually I can do this with COM but was looking >>> for a solution that avoided COM for deployment reasons. I am not sure >>> if this can be done BUT Microsoft Tech support ensures me that it can be >>> done although to date they have not shown me why my sample stub blows up >>> with an EEFileLoadException. There seems to be virtually no >>> documentation on this error that I can find. If it can't be done that >>> would be most helpful to know as I would stiop wasting my time and look >>> for another solution. >> > > Sure - but first I'll psedocode it because even as a small testbed it is > somewhat complex > > C++ DLL interface exposes invokeCrystal > > invokeCrystal is in a C++ compilation unit - pure C++ > > ManagedReport *mr = new > ManagedReport(); > > mr->ViewReport(); > > delete mr; > > ManagedReport object is defined in a separate compilation unit compiled > with /clr > > ViewReport() > { > ManagedCrystalObject ^mo = gcnew > ManagedCrystalObject > } > > In the C# class ManagedCrystalObject a Winform hosting the Crystal Viewer > is to be displayed. > > > In the invocation of ViewReport I get the exception : EEFileLoadException > Also to note is that I cannot step into the managed code unit from the > unmanged code unit. > > If you still need the code I will upload it. > > Thanks for your responses >
[quoted text, click to view] "Dmytro Lapshyn [MVP]" <x-code@no-spam-please.hotpop.com> wrote in message news:e0ktybgYGHA.4836@TK2MSFTNGP05.phx.gbl... > Now I see you are using the IJW technology, and I don't have any > experience with this one :-( > What I can tell is: The EEFileLoadException error means that the CLR could > locate the assembly with the managed class, but couldn't load it for some > reason. > > This link might help: > > http://doc.trolltech.com/3.3/activeqt-dotnet.html > > Also, do a Google search on IJW. > > "Daniel F. Devine" <ddevine@totsys.com> wrote in message > news:%23NctRg9XGHA.4248@TK2MSFTNGP05.phx.gbl... >> >> "Dmytro Lapshyn [MVP]" <x-code@no-spam-please.hotpop.com> wrote in >> message news:OAvCTQ9XGHA.3972@TK2MSFTNGP04.phx.gbl... >>> Can you please post your code that gives you the EEFileLoadException >>> here? >>> >>> >>>> Thanks for the reply. Actually I can do this with COM but was looking >>>> for a solution that avoided COM for deployment reasons. I am not sure >>>> if this can be done BUT Microsoft Tech support ensures me that it can >>>> be done although to date they have not shown me why my sample stub >>>> blows up with an EEFileLoadException. There seems to be virtually no >>>> documentation on this error that I can find. If it can't be done that >>>> would be most helpful to know as I would stiop wasting my time and look >>>> for another solution. >>> >> >> Sure - but first I'll psedocode it because even as a small testbed it is >> somewhat complex >> >> C++ DLL interface exposes invokeCrystal >> >> invokeCrystal is in a C++ compilation unit - pure C++ >> >> ManagedReport *mr = new >> ManagedReport(); >> >> mr->ViewReport(); >> >> delete mr; >> >> ManagedReport object is defined in a separate compilation unit compiled >> with /clr >> >> ViewReport() >> { >> ManagedCrystalObject ^mo = gcnew >> ManagedCrystalObject >> } >> >> In the C# class ManagedCrystalObject a Winform hosting the Crystal Viewer >> is to be displayed. >> >> >> In the invocation of ViewReport I get the exception : >> EEFileLoadException >> Also to note is that I cannot step into the managed code unit from the >> unmanged code unit. >> >> If you still need the code I will upload it. >> >> Thanks for your responses >> > Thanks- I am discovering that EEFileLoadException ALSO occurs when ANY error occurs in the Managed class - a managed client debug session will yield the proper exception in the Managed class - but when called from the Unmanaged class - blindly, I cannot debug into it -any exception will trigger the EEFileLoadException in the C++ class.
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