Call of node on COM DLL can not configure the entry correctly

I have a COM DLL, I try to use LV2013 32 bit. I managed to go as far as the ActiveX 'Automation open' and an invoke node. This makes me a list of parameters which resembles right (input and output), but I don't know that the real data types are correct.

I have the DLL, a file header and an IDL file and 2 different bits of documentation (not everything agree).

I am train to begin just to connect to the server by using the code below (see test Server Copnnect via dll.png)

It does not work telling me that I have the incorrect input parameters.

One of the pieces of documentation lists the parameters like:

char * pConnection required

long ITimeout optionally

char * pOption in option

but the idl file:

HRESULT ConnectServer([in] CHAR *szPara)

and the header file:

virtual / * [helpstring] * / HRESULT STDMETHODCALLTYPE ConnectServer (/ * [in] * / CHAR __RPC_FAR * szPara) = 0;

I would have thought the idl files and header would be more reliable but then why it the method has 3 parameters?

Also the data types seem not fair.

szPara must be a pointer which should be Unlt32 for a 32-bit program (which it is), but the data type reports as an I8 (8-bit integer). the szPara should contain txt connection such as "eth: 10.10.10.10:5000.

I tried to create a string for the data pointer, but it does not work. I tried the typecasting of the I8 but that kills my data and I find zero to the dll. I tried then as above but the wind upward with points of constraint. I need to convert my multiple byte pointer? (Don't know how to do this).

I looked at lots of other calls to invoke node in the same DLL and the direction of the setting always seems correct data types do not change (they are not all integer values, some report as real numbers) so it looks like the invoke node works but I do not know how to drive.

Am I missing something obvious?

Thank you very much

David

A list of the function in the DLL names is also useful to diagnose the problem at hand as would be a list of random characters to understand one language: Niente, Nada!

It's even worse than having just a header for a standard C DLL file, which can at least tell a little about the parameters, but C syntax is notoriously inadequate to describe the real API in a way disambigous.

Here, ' char * name "can be a string, a single character, passed by reference, or a byte array. ' void * name "is even more ambiguous, since it could be basically anything! That's why Microsoft created ActiveX with a typelibrary interface that describes the functions much more in detail, and this typelibrary is LabVIEW (and Visual Basic and other languages 'Visual') has access to build the diagram nodes that have access to the methods and properties of an ActiveX object. If this type library is wrong there is nothing you can do in LabVIEW to make it work in any case except write a C++ wrapper that access the object ActiveX and translated them into a correct ActiveX interface. The reason is that end allows access to the typelibrary but as a descending C real also lets you do all the hard programming each detail explicitedly.

As for your problem with the Denso library that will look much like the library in itself is bad, but that they forgot to certain attribute of the document or registry value that must be set in order to achieve unity of the robot in remote mode. Manufacturers of robotic are notorious for offering little support in access to their material to third-party applications. If they have a library at all so he has often paralyzed and hampered with these small disadvantages and problems.

But trying to access an interface poorly documented to work around this limitation is very likely going to be an exercise even more frustrating. Simply being able to access their obviously badly designed interface you will probably run in a lot more problems. These interfaces at some point it will take magic numbers like parameter as save addresses to write specific values in and I'd be surprised if this documentation is more detailed on details such as the 'official' library is, what they offer for LabVIEW.

You may want what all the bad talk about trying to take away the joy of having a fully working for your problem solution, but believe me, I've been there and dealt with the robotic interfaces and the only way that really works in the long term is to find the guy who knows and let them know what save the address must be tickled to make the LabVIEW interface works the way you want.

An interesting industrial partner with a few good prospects for sales in which case it is possible to work of course helps a lot. Then sellers are sometimes more likely to continue to push the technical staff in the plant to spend a few minutes to find a document of dust collector in the depths of their (digital) archives.

Tags: NI Software

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