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!
I'm trying to execute LPR.exe command to print some labels on a printer. However as its normal, problems occur. I could not find answer on any topic conneced with "sytem exec". I already tried all described methods (I think so). That's why I'm asking very kindly for any help.
When trying to execute or call the LPR.exe from System exec VI, I'm receiving error:
"'C:\Windows\System32\lpr.exe' is not recognized as an internal or external command, operable program or batch file."
Generally I would like to call function: "lpr -S 192.168.1.5 -P lp C:\test\do_druku.txt" which works from command window without any problem.
Out of the box text in the icon editor looks awful. (See attached image, which is better looking than most.)
(Yes, even with small fonts: https://forums.ni.com/t5/Linux-Users/Labview-Icons-under-GNOME/gpm-p/3379530.)
LabVIEW 2016 64-bit, CentOS 7 Linux OS
We have tried many things to get this to work, to no avail.
Does anyone have a solution?
I've been using LabVIEW for a few years for automation testing tasks and until recently have been saving my data to "[DescriptorA]\[DescriptorB]\[test_info].csv" files. A few months ago, a friend turned me on to the concept of relational databases, I've been really impressed by their response times and am reworking my code and following the examples with the Database Connectivity Toolkit (DCT) to use "[test_info].mdb" with my provider being a Microsoft jet oldb database.
However, I'm beginning to see the limitations of the DCT namely:
No support for auto-incrementing primary keys No support for foreign keys Difficult to program stored procedures and I'm sure a few more that I don't know yet.
Now I've switched over to architecting my database in MySQL Workbench. Suffice to say I'm a bit out of my depth and have a few questions that I haven't seen covered in tutorials
Using Microsoft jet oldb I made a connection string "Data Source= C:\[Database]\[databasename.mdb]" in a .UDL file. However, the examples I've seen for connecting to MySQL databases use IP addresses and ports.
Is a MySQL database still a file? If not, how do I put it on my networked server \\[servername\Database\[file]? If so, what file extensions exist for databases and what is the implication of each extension? I know of .mdb, but are there others I could/should be using (such as .csv's vs .txt's) My peers, who have more work experience than me but no experience with databases, espouse a 2GB limit on all files (I believe from the era of FAT16 disks). My current oldb database is about 200mB in size so 2GB will likely never happen, but I'm curious:
Do file size limits still apply to database files? If so, how does one have the giant databases that support major websites? Questions (LabVIEW Specific):
I can install my [MainTestingVi.exe], which accesses the jet oldb database, on a Windows 10 computer that is fresh out of the box. When I switch over to having a MySQL database, are there any additional tools that I'll need to install as well?
I wonder if someone ran into this and has a good suggestion about. I have a DSC project, in which it looks just right to organize hierarchically my shared variables. Like, e.g.
Now this is easy to do programmatically, see the attached project. The problem arises when building an application. It would look as if the plain way to do it, would be to create a build specification which includes the additional libraries, and select their deployment in the "Shared Variable Deployment" tab. However, this doesn't seem to work for nested libraries as in my example. The only possibility seems to add in "Always included" each of the contained libraries. But by doing like this the hierarchy is flattened.
If I include like this,
then the variables within the container library are not deployed at runtime.
In my example project:
open the project in the IDE, run DeployAllSharedVariables.vi, then CheckDeployed, and see the result (all four variables found with their nested paths) build and run DeployFlatLibraries and see the result: four variables, but flattened paths build and run DeployHierarchicalLibraries: only the two variables in the unnested SimpleVariableLibrary are there. I've searched a bit, and only came up with this document, which (for >2009) says "just check the checkbox". Nor the help page says much either.
I wonder if I can do what I'd like only compiling separately the libraries, and loading them programmatically afterwards, both in the IDE and in the exe. Which probably is sane, but inconvenient for the first attempts.