call dll issue

Similar Questions

• Efficiency call DLLS in Labview

  Hello

  I'm working on a labview program for the treatment of the data in real time.  Thus, code running efficiency will be critical.  I wonder how about the cost of calling DLLs.  Similarly, what the call cost of the subprogrammes.

  To implement the same function, the call of a Subvi will be faster than calling a DLL?

  If I can develop all screws Sub in the main program and delete all the calls, which will be much faster?

  Can someone give me any clue or guideline?

  Thank you.

  CRXX wrote: [...]

  I'm working on a labview program for the treatment of the data in real time. [...]

  What is the OS you are using?

  Since you ask in general, I answer in general:

  This question cannot be ansered. This is a case-by-case-thing and must be assessed individually.

  Most of the effect will be the memory management: which allocates the amount of memory? When it's done?

  Memory of ESP. allocation mess up determinism, if a DLL can perform worse than pure code LV (given a BONE of RT LV). But it might be preferable for some algorithms encapsulated... no one can say in general.

  Perhaps the most important question is:

  How many times is that the code (DLL vs Sub - VI) called and how short is its runtime? If the load of execution: calling code relationship is very low (-online 1:1), it is best to "solve" the subcode. SubVI Inling is a valid way in pure BT (from 2010).

  If the code is called rarely, this whole discussion is somehow obsolete as the overload of calls will be negligible, even if it would be quite high...

  And no, C is not faster as LV by definition. It also depends on the task and how you implement it...

  hope this helps,

  Norbert

• Call dll ActiveX in Labview

  Hello

  I'm a new starter in c# .net.  I have a control dll ActiveX (control of vision of NOR -> CWIMAQ). I need to call dll functions in Labview. I searched for articles on this subject. Everyone talks about single thread and register the dll.  I have no idea about these things. Can any body give me a helping hand. How does it work?

  Thanks for any info

  Best regards.

  To use an ActiveX control in LabVIEW, you place an ActiveX container on the front panel and locate the control to put it in. Then use the nodes property and/or call nodes of the ActiveX palette to set properties and call methods.

  To register a DLL open a command prompt, navigate to the folder where your ActiveX control is normally the Windows system32 folder and type

  regsvr32 .

  In LabVIEW use help > type in the search and find examples... tab ActiveX.

• Why do I get 'Bad call Dll Convention'?

  Hello

  the gall attached contains an experimental to read dll in LV 8.6 and use in VB6.

  The zip file contains the vi (adding 2 numbers), LV, VB6 project.

  The service seems to work.  He adds the numbers, but still, it gives the error "Bad dll calling convention".

  I think I did good. I used the Conventioin of the Standard call.  I used Double in LV and long in VB.

  How can I get rid of this error?

  Sombody allows this example on his machine.  Maybe it's something to do with my specific machine?

  VB usually gives the error "Bad DLL calling Convention" when you said an incorrect function.  This can be as simple as exporting with __cdecl instead of __stdcall (although this will crash more likely only), or it could be that because of the function declaration to say the battery is placed in a terrible state because the DLL call placed more or less data on the stack that VB should based on your statement.

  In your specific case, I see a few problems.   For reference:

  In LabVIEW, is your equivalent C function prototype as shown in your project file:

  Double AddNumbers (double * xY, double x, double y)

  In VB, your statement is:

  Declare Sub AddNumbers Lib "D:\NI Projects\eDAS400\DLL\LVDLL Experiment\SharedLib.dll" _

  (ByVal x As Double, ByVal y As Double, xy As Double)

  The first "double" in the C prototype means that the function in the DLL call will return a double.  In your VB prototype, by declaring "Sub" you are, in essence, says VB you don't expect the DLL to return data.  It is a likely cause of your error.  To resolve this issue, change to say "Declare function", and then add 'Double' at the end of the statement.

  The second problem I see is that in your prototype C, the first parameter is passed by reference (like a pointer).  However, your statement of VB, passes all ByVal.  You must change this option to make the parameter that returns data (in this case xY) is passed ByRef.

  Finally, it seems that your parameters in the function of C are probably not in the order that you expect.  I expect to be x, y, xy (which you have in the VB declaration), but the order in the C (ie. in the DLL) function is not the same.  This results in a funny behavior.  The order must match between the two.  To resolve this, I recommend you actually change the LV DLL so that settings are exported in more logical x, y, xy order.

  I think this should take care of your problems.  Sorry so lengthy, but I wanted to make sure that you understand the 'why' on this one because it can be a common error trying to create/call VB dll.

  Jason

• No sound with phone calls, known issue?

  Has any body had this experience? Phone was working fine this morning. The person I call hear me very well, but I get nothing. Also receive nothing when I switch to speaker. The volume is completely upward. Other thin media works. When I connect my bluetooth headset, it works fine. I have tried everything; turned off the bluetooth, factory reset without restore, safe mode, etc. I get nothing.

  Unfortunately, it was my replacement phone, from their experience of the "split screen" issue

  With what you already have, I think it's time for you to call/chat with bike for a possible replacement. I hope this helps.

• Call dll error 1097

  Hello

  I'm reading the data from a capture card in my slot PCIe card. When I call the "Initialize" function from the .dll file that I got with the card, I always get error 1097. 1097 means that the called function threw an error. When I run the program supplied with the acquisition card, the acquisition card still works.

  If I have everything just omit the "initialize" function call and continue with the function that will be called after the "Initialize" function, LabVIEW block (program stops without any warning).

  I also had a LabVIEW program that uses the dll that was supposed to work. But here I get the same error.

  Do you have any idea what normally causes this behavior and how can I solve this problem?

  I have the second post of nathans. 1097 error is almost always an error in the configuration of the right to call library node. And in some cases, there is no right to set up and you need a wrapper DLL to convert between what the library node call allows and what needs your DLL. The reason why it works sometimes and other times not, actually is that it never really works, but sometimes the error that gets caused cannot be detected by the operating system and LabVIEW does not get an exception according to. This can change according to LAbVIEW version, runtime system or development and even recompilation of the code after the small seemingly unrelated changes in demand.

• error 1097 after the call dll function that allocates memory inside

  Hello!

  When a one call my duties in my dll of LabView, I get an error 1097. My function takes a few arguments, and then allocates memory for the measure.

  He doesn't have pointers to this memory area, it's just allocates this memory for himself. I don't know what could be the problem, no doubt, I'm missing something.

  Could you please help?

  Best regards

  Tamas

  
  

• call dll driver in labview exe

  I have an instrument driver in LabVIEW.  The driver still functions call a DLL in instr.lib through the call library function.  When I compile an exe file that uses the driver functions, where should I put this DLL?  He would be allowed to compile the DLL in the exe?  If it's ok, how it works, because the driver get the DLL in instr.lib?  Thank you!

  You can not choose the exe as a destination of the DLL. Yes, the DLLS are located in the folder data.

• Sequencefileload freezes when calling DLL

  Hello

  I TestStand 4.1, and when calling a DLL on the MainSequence, everything seems to work fine, but if I call him on a SequenceFileLoad TestStand freezes on this step.

  What could be the problem?

  Kind regards

  Daniel Coelho

  Daniel,

  In fact, printf() can be the problem.  Because you are calling it in DLLMain, there are additional considerations you need to keep in mind.  Microsoft has a great page on these considerations here: http://msdn.microsoft.com/en-us/library/ms682583 (VS.85) .aspx

  Some excerpts:

  The entry point function must perform only the tasks of termination or simple to initialization. It should not call the LoadLibrary or LoadLibraryEx function (or a function that calls these functions), as this can create dependency loops in the DLL load order.

  Calling functions that require one dll other than Kernel32.dll can cause difficult to diagnose problems. For example, the calling user, Shell and COM functions may cause access violation errors, because some functions to other components of the system load. Conversely, calling functions of these courses of termination can cause an access violation because the corresponding component may already have been unloaded or errors not initialized.

  I'm sure that printf() is a shell command.  Also, while loading the file in sequence, it is likely that TestStand loading of DLLs or COM objects at the same time, which could conflict with a code that you have in DLLMain.

  Apart from that, Microsoft strongly recommends against any unnecessary code in DLLMain.  If this problem only may not be something to do with the products NOR, but more practical copies creation of DLL in general.

• call quality issues

  Hello I used version of e xt1022/Indian motorcycle. Reduced by two weeks, I noticed this Muslim call on my device
  
  I hear that a lot of people on the other end of the call have noticed drop of voice, distortion, etc even if I had a network coverage full all the time I noticed the problem, it seems that it is not a SIM related issue. How do we know it's because of some hardware failure or network problems?

  Try your speaker. Or try to call using a headset. If you find an increment in the quality of calls while the problem lies in the listener. The get also checked in the service center

• Function call libraries issues

  Hello

  I have a software development kit that I work with who provides (atmcd64d.lib and atmcd64d_internal.lib) .lib files and. DLL of the same name files that are located in my (x 86) /Program Files / National Instruments/LabVIEW 2013 / user.lib directory. I have a master .VI that contains lots of VI of this library. However, when I try to load the VI, it tries to find the. DLL file. I find manually the. DLL file for her. When loading, however, I get errors all my sub VI telling me that they are not executable due to an error.

  Follow this error all the way to the root, and I find that the library function node call said that the "library not found or failed to load." However, I can't change this library function node because it is in a VI that is in a library. So, I can't just point each VI to the appropriate library.

  I think the problem is that the. DLL is not directed to the correct libraries. How can I find out where the. DLL is indicative that the s VI pick up their libraries of the Labview? Should this I back?

  I would be very happy to provide all the necessary information. Thank you for your help,

  In addition, your files have 64 in their names (indicating that they are 64-bit dll?), but the path is in Program Files (x 86), indicating that your LV is 32-bit. I'm pretty sure you cannot load 64-bit dll into a 32-bit process, but I don't have the experience to say what would happen if you actually try.

• Error 1097 when calling DLLS in LabView

  I get an error 1097 when calling the LabVIEW provider library. Curiously, the error, the DLL routines still seem to do what is asked of them.  This is the test code.  It opens an Ethernet connection to a controller of axes Galil, he asks (possibly) the value of its internal clock, and then closes the connection.  Each call library function returns error 1097 but "valve function" I32 error number is always zero. Open function causes the connection to be opened, the command function causes the send command and receives a reasonable answer, narrow funtion seems to cause the connection to be closed.

  

  Here is what I see when I run the test:

  

  Also directly configure call-library functions, as I did in this VI, I also tried using the import-shared-library Wizard to create a vilib of functions of the DLL and I get the same behavior and errors when I use these functions.  I tried to tweak some of the data types in my configured manually call library functions to see if I could find a combination that worked better with the library, but had no luck there.

  I use the x 86 version of the DLL with v2014 LabVIEW 32-bit on a 64 bit windows system 7.  I see that the error on the two computer systems of different work configured in this way. I see a similar error on a home computer with just the RTE of 2014 installed. The manufacturer says they can not reproduce the error. I always saw the error over multiple versions of their library DLL.

  In the attachment ZIP it has a link to the DLL library on the manufacturer's website. There is also a copy of the VI, the DLL and a large part of how-to-use documentation that accompanies the DLL.

  I was hoping that someone who was familiar with the use of the call-library function might take a peek at what I do and see if an error could be spotted.

  Unable to find an error, I did, I would be happy to suggestions on how I could solve this. Little seems to me like there may be a problem with the library. The manufacturer, Galil, said that they have opened a log with OR to see if NEITHER could help but since Galil said they can not reproduce the problem and provide an example of the NC, it really went anywhere.

  Given the decoration of symbol names as exported by the DLL I "m convinced that you must change the stdcall calling convention.

• 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.

  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.

  Grateful if someone can help to explain why we get this error and how to overcome?

  Thank you

  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.

• LabView crashes after calling DLL

  Hello

  I'm working on a library that makes calls to the other dll, which is linked dynamically.

  I have to do this, customize the DLL search order before the call and add a few custom directories (where are the dll called).

  The called code works very well, and doesn´t in the DLL called memory leak, however LabView is suspended.

  It took me a long time to understand this, so I hope this helps someone in the future. Below is the solution.

  LabView uses its own research agenda DLL, so beware of assistance call "SetDefaultDllDirectories" regarding the whole process and LabView DLL management function will burst.

  Allways avoid using flags in the LoadLibraryEx.

• Calling DLLS in LabVIEW

  Hello

  Below is the code written in LabWindows in which dynamically access a Dll using Windows API LoadLibrary(), GetProcAddress(), and FreeLibrary().

  Successfully, I could load the library and get the procedure address using library calls node in LabVIEW. But got stuck after that.

  As I am not good in C/C++ coding, ask someone to really help me to write the same thing in LabVIEW.

  Kindly do the needful.

  #include   // Function prototypes.
  #include     // CVI Active X definitions.
  #include 
  #include    /* Needed if linking in external compiler; harmless otherwise */
  #include 
  #include 
  
  typedef long __stdcall( *OLECREATEOBJECT)(char*);
  static  HINSTANCE  Hinstlib;
  static  long  gvntISystem;
  
  long CviCreateFastObjects (void)
   {
  OLECREATEOBJECT procAdd;
      pStrTempmem      = (char*)CA_AllocMemory(1);
      Hinstlib = LoadLibrary("FastTrio");
      if( Hinstlib != NULL)
  {
          procAdd = (OLECREATEOBJECT) GetProcAddress(Hinstlib, "OLECreateObject");
          if(fRunTimeLinkSucess = (procAdd != NULL))
  {
          gvntISystem = (procAdd)("FAST.IMFASTSystemInterface");
          return 0;
          }
          else
          return 1;
          }
      else
          {
  return 1;
          }
  }
  

  All the information you need are in the C code.

  • OLECREATEOBJECT is typedefed just after all the #includes at the top.  It returns a long integer (typically I32 in LabVIEW, but could be I64 on a 64-bit operating system) and takes a string as input.  It uses the standard windows calling conventions, not the C calling convention.
  • LoadLibrary and GetProcAddress are used to get a pointer to the function (procAdd).  This is handled in LabVIEW, by filling in the location of the library and the function in the call library node.
  • The library of appeal in LabVIEW node must also be set to the standard calling convention and return value (I32) and list of parameters (a string) must be set.
  • the function is used to set gvntISystem with a constant of entry 'FAST. IMFASTSystemInterface ".  In LabVIEW, a constant string of wire at the entrance and read the return value.
  • You can implement the audit, thus using the call library errors node error output.

  Good luck!