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Hello, I wrote a LabVIEW program to communicate with a hardware sensor using vendor-provided LLB and a DLL files. The program runs fine on my workstation both from LabVIEW IDE and from a compiled executable. The problem starts when I copy the entire executable folder to a target host without a LabVIEW IDE (only with a runtime engine). The application opens with a broken Run arrow and a "missing external function" error message appears for every function call I made to the DLL (see attached).
I have tested my application on 5 completely different Windows 10 computers managed by different people. On three of them with various versions of LabVIEW IDE my executable opened with a whole Run arrow and no error message. Two other machines previously had no LabVIEW, so I installed a Runtime Engine 2017f2 32-bit with default settings to match the version of my IDE. Both gave an identical error message.
The DLL is always included in the application build. I have tried placing the DLL in every conceivable location on the target host: in the executable folder, in the /data folder, in the c:\Windows and system32 folders... I even created a full folder tree matching the location of the project on the developer workstation. Same error. When I intentionally hide the DLL, my executable prompts me to point to it upon being opened, and when I do, I get all the same error messages.
Vendor documentation only asks to put the two files in the same folder. From programmer's manual: " The driver was written in LabWindows/CVI, version 4.0.1 and is contained in a dynamic link library which can be linked with a variety of programming languages." There is no vendor-provided support.
One way I actually got rid of the error message was by editing every Call Library Function Node in every VI in the LLB to use relative path to DLL together with the Application Directory VI. However, I feel that there has got to be a better way to compile than by editing a vendor-provided library, especially since it works as-is on some computers. Can anyone suggest what it is?
Thank you for your time!
 

DLL functions or shared variables?  Or something else?
I have a Labview 2014-64 executable (or I can build a DLL) that runs one piece of equipment, the X-ray.  The other engineer has a large CVI Labwindows 2015 + MS Visual Studio 2012 (C++) executable that runs everything else.  I want the Labview code to be a slave of the CVI code, accepting commands to turn X-ray On or Off, reporting failures, and the like.  Translating the X-ray code into C++ would be possible in principle, but not fun.
Shared variables look easy, but I'm kinda scared of them.  I would define all the shared variables in my LV code, since I'm more familiar with LV, then use them in both.  There's a thread in here called "Shared Variable Woes" so maybe I should be scared.  In the alternative, I tried building a proof-of-concept DLL in Labview, and calling its functions in CVI/C++, and it works, but it's kinda clunky.  (I'm attaching it below in case you want to play, or advise.)
Your advice would be appreciated.
XrayDLL.zip

To use a controller from LabVIEW I have to use some functions of a DLL.
For one of the functions, according to the header file .h there is a structure data with parameters of different types that I have to pass to the dll. Some of the parameres are BYTE (1 Byte)  and WORD (2 Bytes).
When compiling this kind of structure with Visual C++ and looking at it's size with "sizeof()" it seems to me that 4 Bytes variables have to start in a position multiple of 4. For example if there is a BYTE and then a DWORD, the 3 Bytes after the BYTE are ignored and the DWORD starts at Bytes 5 to 8.
When defining a LabVIEW cluster to match the DLL structure, will LabVIEW do the same? If in my cluster there is a U8 variable and then a U32, will anyway the U8 take 4 bytes?
 
Thank you.

So I created a DLL from a Labview VI that has a 2D array input (and some scalar inputs) and some 2D array outputs.  Labview creates a .h file with these lines

And then it defines the 2D array arguments to my function as being of this type: "void __cdecl Linear_discrim_4dll(DoubleArray *dataObsFeat, int32_t grpAsz," etc etc.  Trouble is, I have no idea how to fill out this structure so that the DLL can use it.  Say for simplicity I had a 2 by 3 input called dataObsFeat with elements {1,2,3; 11,12,13}; how would I create the object with these values in C or C++ and pass it to the function?  I am a total C++ noob, in case it isn't obvious.

Hi
 
When I call the DLL, there is a structure:
struct Signal { uint32 nStartBit; uint32 nLen; double nFactor; double nOffset; double nMin; double nMax; double nValue; uint64 nRawValue; bool is_signed; char unit[11]; char strName[66]; char strComment[201]; };  
 
There is another  Message structure to the above Signal:
 
struct Message { uint32 nSignalCount; uint32 nID; uint8 nExtend; uint32 nSize; Signal vSignals[513]; char strName[66]; char strComment[201]; }  
  The point is  Signal vSignals[513];
 
I've tried to solve it like this，but the program will crash.
 
How to create struct Message ，any good suggestions?  Thanks a lot.
 

message.vi