Access to COM Port via DLLS in Labview is not possible

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  Also COM binaries were made in C++, but if I understand well there should not be a problem at least for the library call feature.

  This seems to be a case of corner.

  Actually COM! = ActiveX!

  COM uses ActiveX to implements its objects and also to instantiate and control their but COM is simply a binary model of the API and some functions to control the instantiation and the lifecycle of objects COM, nothing else. The only way to access COM objects correctly (when no ActiveX type library is provided) is to have a C (++) compiler that can analyze the header files according to interface with the interface object methods. All ActiveX controls use COM to implement the interface calling of their objects, but also adds a type library in the DLL and a few other niceties such as the properties of the object. This type library describes how to match the properties and methods of the ActiveX for real virtual table COM interface pointers.

  LabVIEW lists this type library in order to be able to interface to the COM, Active X objects interface. A pure COM library is missing all these subtleties. If LabVIEW would be favourable to a COM interface node, its configuration should allow the configuration of all the things that describes the type library. This configuration would require a lot of manual configuration details, similar to what the library node call, only a magnitude more complex. If this is not really an option.

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  I'm trying to find a way to get a specific com port through the command via the command exec system prompt in labview. Is it possible to get the list of com port connections just like one you see in Device Manager where he will give the list the name of the device connected to a certain com port? I want to be able to automatically find the port com for a specific device.

  because it is a virtual com port that gets set up and I tried the vi to find resources VISA and it did not work. However, funny enough, just after I submitted this post, I found the solution to my problem. If you use exec system and type this command in the standard input:

  WMIC path Win32_SerialPort

  This will bring up a list of all com ports connected and very fast too. From there I can analyze the information I want and widdle down to the com of the desired usb device port.

  Maybe this can help someone on the road.

• Re: How to connect to the mobile phone via the com port

  Hello
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  Satellite A300 Vista preinstalled
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  Motorola Razor V3 mobile phone

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• Read the serial number of the device in LabView COM port

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  Is it possible to read a device COM port number in LabView? I would like to make an initialization of the program following the right port COM of a device, for example a USB temperature reading device, and set the COM port as the correct port at the start of the main program of LabView. I want to do that, because a USB device gets usually different dedication of COM port on different computers. Our application runs on 80 different computers. A program like that would be very nice.

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  Another thought. It also has a place where certain standards can save you a lot of time.

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• Python, call DLLs in LabVIEW: Fatal internal error when accessing output String Cluster

  Hello

  We have compiled a DLL in LabVIEW (TestError.dll) and tried to call it from Python.

  TestError.dll includes 2 functions:

  1 testErreur: cluster 1 entry string, 1 channel indicator

  2 TestError2: 1 channel input, 1 bunch of output string

  What we try to do in Python is actually something like this:

  1 provide values to controls in the functions of the DLL.

  2. call the DLL.

  3 get the values of the indicators.

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  1 read/write operations on normal data types (string, digital) indicators/controls are OK

  2. write operation on the Cluster string entry is OK

  3. read operation on the Cluster output string is not OK. The following error is still prompted for:

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  Also joined the TestError.prj and python code.

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  howmean

  What we have seen are:

  1 read/write operations on normal data types (string, digital) indicators/controls are OK

  2. write operation on the Cluster string entry is OK

  3. read operation on the Cluster output string is not OK. The following error is still prompted for:

  «Unrecoverable internal error: 'MemoryManager.cpp', line 437.» LabVIEW version 8.6... »

  Also joined the TestError.prj and python code.

  It is very logical that it does not, and the bad news is, it cannot really be implemented reliable of a process not LabVIEW.

  LabVIEW channels (and tables) are very specific species. They are then called handles, which are pointers to a pointer to a block of memory. If you have a control or indicator on its own, the Prototype configuration allows you to configure this setting as a C. LabVIEW data pointer, when creating the DLL, create heels C for each exported function and place the code to do the translation between the past C pointer to and necessary LabVIEW data handle. For strings and arrays within the cluster, there is no configuration option and the DLL is expected to pass a structure with data handles native LabVIEW in there.

  You may say that creating handles data in your calling process enough to trick LabVIEW. For the input variables that actually CAN sometimes work (but is a delicate and dangerous generally to handle this). There is no way to make it work for output variables. LabVIEW will try to resize handle to fill data in that he wants to make. This resizing is done using internal memory manager of LabVIEW. This will work only if it had been allocated by EXACTLY the same instance of the memory manager. Otherwise, it refers to a different memory segment and catastophally fail. The only way to make this work perhaps, with luck, taking your heart and prayer to the gods, is to lvrt.dll to allocate a handle that you must pass to the DLL. Still find the good lvrt.dll, which will execute your DLL LabVIEW is a major challenge.

• I can't find com ports in Device Manager. Trying to interface with a counter digital multi via a RS232 connection.

  The software supplied with the meter has enough summary documentation.  When I tried to open the software, a window pops up saying that the port com 1 cannot open. I used baud rate settings that the software manual recommends but no help. Then, I uninstalled the COM ports. Now they are gone and I don't know how to re - install.

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