External DLL with struct array

Similar Questions

• How to handle a function with struct return of dll?

  I have a dll 'SCTSCTL_OPEN' function returns a structure like

  typedef struct _sctsctl_t {}
  HANDLE hDevice;
  unsigned char ctl [2];
  unsigned long necessarily;
  unsigned long data_diff;
  HANDLE IsrThread;
  HANDLE IsrEventHandle;
  PVOID can't;
  void (* Manager) (struct _sctsctl_t * board, int intvec);
  } * sctsctl_t;

  SCTS_API sctsctl_t __stdcall SCTSCTL_OPEN (DWORD instance);

  I have imported this dll with LabVIEW and vi returns an unsigned long integer shown as follows.

  

  How to make a comeback with structure? Any help would be appreicated.

  Kind regards

  Adam

  LV 8.5.1

  Normally I would be tempted to do a wrapper function and call it with LV LV. handles structure not so naturally.

• Problems with external .dll

  TestStand 2010 (4.5.0.310)

  Visual Studio 2010 Ultimate 10.0.30319.1

  .NET framework 2.0

  Hello

  I am trying currently testStand see if it meets our needs. I created a file .dll with .NET 2.0. I have a very simple class with 1 constructor and 1 method returning an integer (5).

  Now, in TestStand, I created a step with the .NET adapter. I added the Assembly, class and selected create a remote object invocation of .NET area. With respect to the parameter name, I tried a dozen things but no luck. At runtime, I get the error message 17500 (see image). See also BackPlane_seq.jpg for the simple sequence file I created.

  Thank you

  Mathieu Bazinet

  This happens because the module is loaded into memory.  Go to file"unload all Modules to unload.

• For the complex data type, how to generate the Dll with compatible interface to C/C++

  Hello

  I used the Labview FPGA module to develop test equipment. Now, I need to write a driver that is to be a Dll with compatible interface to C/C++ for this equipment. So that my client who is familiar with C/C++ can call the driver without any study on labview. But I had a few problem on how to convert labview for C/C++ data complex data type. To clearly explain to my question, I have attached a simple example. (see attachment) I try to generate a Dll for the attached example VI and get the the function prototype at the head of the files as below:

  ' void OpenFpgaReference (LStrHandle * RIODevice, TD1 * errorIn, LVRefNum * FPGAVIReferenceOut, TD1 * errorOut).

  As you have known, the type of data "LStrHandle * RIODevice" and "LVRefNum * FPGAVIReferenceOut" Labview data format are. C/C++ do not have this kind of data type and can not reconige it. As a result, I can't call the Dll of C/C++ programming language. How to convert these two data type of labview for the C/C++ compatible data format, and then build the Dll? Anyone know about this?

  The answer is really apprecaited! Thank you in advanced.

  Ivan.Chen wrote:

  As I found in the following article:

  http://digital.NI.com/public.nsf/WebSearch/FB001AA027C8998386256AAD006C142D?OpenDocument

  LVRefNum is the name of resource of LabVIEW VISA or refnum, and "it is impossible to convert LabVIEW VISA name of resource or refnum VISession valid ID."
  This means that external code modules can not access & control the session VISA which is open by labview. But for my purposes, I will not attempt to access this VISA extenal code(C/C++) session. I just hope that save this session VISA in the external code once I opened it in Labview dll; and pass it to the labview dll when needed. While I have not need to login again when I need to control the device. Is it possible to do?

  A LVRefNum is really just a single int32 value. Its meaning is useless for other environments than those who created it so that you Michael not any what in C/C++ caller but pass it back to other functions in your DLL, but this often isn't a problem at all.

  You can take the following statement of the LabVIEW extcode.h headers and add them to your delabviewed header files to make it work in such a way.

  #define Private (T) typedef struct T # _t {void * p ;} * T}

  Private (LVRefNum);

  The LStrHandle you must set a standard C string instead in your export DLL and document what is the size of the string buffer should have if it is an output parameter.

  TD1 error clusters should also be divided into their parameters (C compatible) separate for all items or just to the left of suite entirely.

  Rolf Kalbermatter

• Qosmio G10: Scanner uninstall problems - cannot load the external DLL

  I tried to uninstall an old scanner HP my Qosmio G10 and received the message - internal error unable to load or call external DLL, please contact you provider for more information. If I could use the product to restore disc and all saved this would restore the system to the way I bought it or are ther programs on the CD-ROM tools & utilities.

  I am a novice at this so any help is appreciated. Thank you emdpar

  HI Michael,

  You can certainly use the recovery of the product CD to re - install your system to its original state, but this seems a little extreme just to remove an old hardware device to your configuration. You should not need to use the tools and utilities disk unless it contains items that are not in the recovered system.

  I assume the error with the uninstall wizard is because only the original installation used a product CD that cam with scanner HP and the missing DLL is on this CD.

  Kind regards

• Access a dll with a table as argument in Teststand

  Hello

  I did a dll with the following function call:

  __stdcall __declspec (dllexport) int FSCOM_ModbusQuery (int nComport, ucAddress unsigned char, unsigned char ucFunctionCode, unsigned char ucTxData [], int nTxDataLength, unsigned char ucRxData [], int nRxDataLength)

  I want to access this function call in Teststand 2010 SP1. I did table 2 in Teststand and gave addresses to the function call (as you can see in 'Capture.png' and 'Capture1.png').

  When I try to run the sequence I get an error on the ucTxData and the ucRxData with the message "number expected, found the table of numbers.

  How can I solve this problem

  Thanks in advance

  Wissam

  I think you have misunderstood what I wanted. In the specification of the Panel Module tab, you can change the type of data that the function expects. You probably set on the wrong thing. It must be set to an array of numbers where the elements are unsigned 8-bit integers.

  -Doug

• VI = external dll function pointer reference?

  So I'm porting this simple program in C in LabVIEW. It receives signals of a haptic (Sensable Phantom Omni) material. It should be simple, but it showed several complications. (been stuck for 2 weeks )

  I managed to import the material with all its functions DLL (using LV 8.2, because 8.5 and 8.6 Assistant sucks).

  But there is a function whose argument is a function pointer:

  hUpdateHandle = hdScheduleAsynchronous (updateDeviceCallback, 0, HD_MAX_SCHEDULER_PRIORITY);

  I already have the corresponding VI to updateDeviceCallback (which is a (void *) who don't really use and returns an int).

  hdScheduleAsynchronous is part of the API of the material (I'm not kidding with her, and I know what's inside), and as first argument expects a function pointer.

  Can I use the node reference to open VI to get the "pointer" for my VI and then feed him as an argument for the external DLL? How to properly mount the ref VI data type in a function pointer?

  Although DLL probably uses the C calling convention and then Visual C like prefixing underscore before the exported name. Node to call library of LabVIEW bypasses that you entered because when he's trying to GetProcAdress a function name, and the operation fails, it automatically retries with the name of function with added underscore. For your own "Wrapper"DLL", you will have to do something similar, or use the right name.

  But while the reminder THAT DLL is indeed must be written in C to avoid trouble, functions to load the library and GetProcAddress can be easily implemented directly in LabVIEW by using the node library call. It lets more easily play you with such things as the function names.

  Rolf Kalbermatter

• using the iMac 27 inch mid 2011 as an external monitor with a PC via mini DisplayPort

  I find conflicting information via web search to be able to use my iMac 27 inches, mid-2011 as an external monitor with a PC. Is it possible to use the iMac as an external display via the Display Mode target between Thunderbolt port of the iMac with a PC equipped with a mini DisplayPort?

  Of course, I hear it's possible with the appropriate cable. But if it is not possible, I would like to know for sure.

  Thanks in advance for your help with this. _henry

  Target display mode is Mac to Mac only. Use your iMac as a display with the target - Apple Support Display Mode

• Tecra S4: cannot switch automatically to an external monitor with APR 3 +.

  Hello

  I used a Tecra S4 (with Windows XP Prof.) with monitor 3 + and with an external 19 "Advanced Port Replicator. If I connect my laptop with the Port Replicator, it will automatically switch to the external display. I have to use the function "FN" to move."

  I signed up the external monitor with "use this device as the primary monitor.
  I don't have this problem with my other laptop Toshiba Tecra A3.

  Now, I think the problem is the geforce graphics card.

  Does anyone have the same problem?
  Thanks for the help and sorry for my bad English; (o)

  Hello

  It works with Tecra S4, too.

  Install new Modules of Commopn
  http://support.toshiba-tro.de/Tedd-files2/0/CMOD-en-20071119111948.zip

  Install the latest Toshiba laptop Extensions
  http://support.toshiba-tro.de/tools/Tecra/TS4/XP/TME/TME-TS4-XP-38400xp-en.zip

  Install the display device change Utility
  http://support.toshiba-tro.de/tools/Tecra/TS4/XP/DPL-change-drv/dspdevchge-TS4-XP-2500-en.zip

  Enter in Control Panel, start Extension mobile controls.
  Go to the tab 'Change of display device' and activate the Service.

  Now, it should work.

• Qosmio X 500 - 13R: picture on external monitor with resolution 2560 x 1440 is blurred

  Hi all

  I have a computer laptop X 500 - 13R Toshiba Qosmio, although 2 years, still a great piece of hardware.

  I just bought a new monitor 27 "U2713HM which supports a resolution of 2560 x 1440.

  Computer video card notebook (GTX 460 m) supports a resolution higher than through a digital connection, so I used a HDMI cable to connect.

  Via Control Panel Nvidia, I could create a custom resolution, but the image is not clear / is blurred.
  It is readable, but it's just not everything.

  Tried with HDMI 1.4, without success.
  I volunteered to connect through Dual Link DVI cable, but the phone doesn't have a DVI connector, and I doubt the adapter will help.

  Anyone has a suggestion how to fix this problem?

  Thank you.

  I would like to share my experience using an external monitor with a HDMI cable.
  My monitor supports both HDMI and DVI port.
  First of all, I plugged my laptop on the external monitor using a HDMI cable to HDMI.
  But the fonts and the picture was not clear. I used the resolution 1920 x 1080

  Then I went to the DVI port. I plugged the laptop s HDMI port to monitor s port DVI (HDMI/DVI cable) and that solved my problem.

  I'm not quite sure the relevance of m this could be for you, but it worth the try

• How can I use external speakers with my MacBook Air?

  How can I use an external speaker with my MacBook Air? I have a Samsung wireless speaker.

  They are Blue Tooth? If Yes, then you need to pair by using the preferences of BT.

• How to use two external monitors with my laptop?

  I have a new Pavilion dm4-301 d cl Entertainment PC.   My OS is Windows 7.   I'm used to using two external monitors with a docking station.   This new laptop lacks a docking station.  What should I do use two external monitors?

  Certainly not without a dock, but even with laptop HP well enough docks limit you to one of the ports on the external monitor, even if there are two on the dock. We used a device called an Atlona AT-HDPIX2 which is a USB to hdmi adapter. It provides a feature of third monitor for a laptop... use the native external port of the screen and the computer screen internal, then this device gives a third control that is fully configurable to display Windows 7 interface... clone, extend, etc.. It allows a full HD resolution and is pretty responsive for games even light.  HP does not have any true docking station for your laptop.

• require external dll function prototypes

  Greetings,

  in the compilation of the CVI Options, I checked "function prototypes require" because I think it's a useful security measure. The project includes about 30 files that all work fine except one that relies on the functions provided by an external DLL.

  As a result, these function calls are not prototyped and I get the error 'missing prototype.

  I could imagine two solutions:

  -find a way to functions external prototype

  -exclude a file of this compilation option

  I prefer the first version and doubt that the second option is possible.

  So here's how to use the DLL:

  a typical function call looks like this: (* ext_dll_Continue) (instrument);

  where the address is obtained through ext_dll_Continue = GetProcAddress (ext_dll, "Continuous");

  and ext_dll_Continue has been defined as

  FARPROC ext_dll_Continue = NULL;

  Help how prototype such a function call would be most welcome - thanks!

  Wolfgang

  I do this kind of thing all the time in the CVI. I use the following general method:

  typedef __declspec (dllexport) int (* pfint1) (int); This definition corresponds to that in the .h file

  pfint1 continue;                                    This will be our reference to the external function

  Continues = GetProcAddress (pfint1) (dllHan, "Continuous"); dllHan presumed valid here

  Val = continue (param);                             Call the function in the dll

  Presents all works without warnings. (Prototypes required box ticked.) Of course, you can present different typdefs for the various models of different prototypes that you plan to use.

  JR

• How to fill a control ring with chains [] array?

  How to fill a control ring with chains [] array?

  It must be karma. (Try really bad karma because I couldn't post this question in my original)

  I must have been a Really bad guy in a previous life...  It's not like I'm bad in this one...

  So... what I want to do this time around?  Something that I thought would be easy... Well... it's a long story...  I had a simple solution, but the client wants something else.  -sigh-

  Here is what they want...  They want a control that allows for multiple selections to a control of the ring (or a control that allows a drop down selection menu).  Bites are filled at run time because it is based on 10 000 other precedents of things this particular choice.  So it must be dynamic.

  The snippet of code & images below show what I'm doing a little...

  The bottom image shows on the right bites which is filled in the control of the ring.  Since the number of items / items changes, I didn't have a bunch of controls stacked on another.  In addition, I have to deal with an unknown quantity of selections.

  Does anyone have a solution that can be recommended?  If so, can you share the solution / idea?

  Thank you

  RayR

  

  

  I have posted a code that does something similar here: http://forums.ni.com/t5/LabVIEW/array-of-cluster/m-p/1822451#M625032

  It uses a table hint and individual controls that are moved on top of the table and populated as needed.  This approach might work for you?  You would need a two-column table and only control ring, which you would fill properly whenever the currently active cell changes.

• Call and open an external Excel with exec system vi

  Hello!

  I would like to know how I could call and open an external Excel with the exec system vi. I am able to call a txt file, but I can't do it with an excel file...

  Thank you very much in advance.

  It should work like any other file, it opens in the default program for the file extension that if you double click on it.  Here is an example if code that I use.