I have a c++ library that I'm calling via the standard call library node in LabVIEW. I'm using 2017 VS to edit the c source files and 2020 32 bit version of LabVIEW. Consequently I've made sure to build new versions of my library in x86. I have not been able to nail down why I keep getting a 1097 error after the node call (I've included pictures of the function prototype that I'm attempting to call in the c header file, the node configuration interface, as well as a picture of the block diagram).
Additionally, LabVIEW reported these errors in the log when I restarted my development system:
DWarn 0x0E697B77: Caught exception in ExtCode call!
DWarn 0x50CBD7C1: Got corruption with error 1097 calling library Multilane_ML4039_Interface.dll function GetEyeDimensions
I've read that with this combination of errors, LabVIEW is catching an exception thrown by the .dll and this will prompt the library node to generator error 1097. This is often because of improperly configured parameters but as far as I can tell, my configuration is ok.
Any help is much appreciated.
Function prototype in .h file
Library configure node in LabVIEW
Block diagram containing library node
Got it resolved. My tired eyes didn't see I had one of my parameters in the prototype entered as a pointer instead of a value. Check those parameters people!
Related
I am using VS 2022 Community Edition (v17.3.3) to build wxWidgets application (v3.2.0) using C++ (v14.3 - Features from Latest C++). The windows SDK is using the latest installed (10.0.22621). The project is also using C++ modules.
The Debug build succeeds but when I run the project's exe file at random it throws the exception (Access violation reading 0xFFFFFF (ucrtbased.dll)) in exe_common.inl at the following line:
__scrt_current_native_startup_state = __scrt_native_startup_state::initialized;
After a few more compilations (by just making minor changes to trigger a compilation) it succeeds and the exe runs correctly.
I wonder if there is any settings that might be causing this random error. Btw, I am using Win11 but same thing happens on Win10 as well.
Thanks in advance.
EDIT 1:
The project is using boost libraries and at startup boost/json (boost/json is used in other parts of the project as well). Debugger shows that after the following line the above error happens:
static allocator_arg_t allocator_arg = BOOST_CONTAINER_DOC1ST(unspecified, *std_allocator_arg_holder<>::dummy);
There were a few things needed attention:
Discontinued use of wxSQLite (the library was not maintained for over a decade),
The main frame was a singleton data structure, not anymore, and not deriving from wxMDIFrame anymore.
All unnecessary (a chain of them) #include removed.
Inclusion of <boost/json.hpp> in a few files were removed and now using #include <boost/json/src.hpp> only in one .cpp file. However, the project still uses inclusion of <boost/json/value.hpp> in multiple .h files.
All uninitialized pointer variables and others were initialized.
#1 and #4 were especially pointed by the debugger. It has now been more than a few days and haven't had the problem since then.
I was able to temporarily get some legacy Fortran code running (I was able to step through it with the debugger) in Visual Studio 2017 with the Intel Fortran compiler, until it stopped working apparently for no reason.
At the very start I was getting the error below when trying to get the code to run.
error #6633: The type of the actual argument differs from the type of the dummy argument.
That error went away after a post-installation reboot and I was able to test the code for a few weeks, but now it's back.
I don't think I've changed any of the code.
You're using Intel Fortran and it has a feature called "Generated Interface Checking". The way this works is when you compile a source that declares a subroutine or function that isn't in a module, it generates an INTERFACE block and saves a compiled module for it. Then when you compile a source that calls a routine for which you have not provided an explicit interface, it looks to see if there's a generated one and compares it. If you have an argument type mismatch you'll get an error such as this.
However, to work properly the called routine must be compiled before the caller. If this doesn't happen, the interface can't be checked and you'll not get an error. The error is still there, and you may be able to see it if you do a rebuild of the project. Pay attention to the message and fix the problem it describes. A mismatched argument type is a common cause of run-time errors that come and go.
Good afternoon,
I'm trying to work with some C++ dll files with Matlab, and I'm trying to implement a simple test case to understand the procedure. The dll file I'm using is copied verbatim from here:
https://msdn.microsoft.com/en-us/library/ms235636.aspx
I only implement up to step 5, since my hope is to call the dll file through Matlab. After completing step 5, I copy MathLibrary.h and MathLibrary.dll to the directory I'm using for my Matlab code, and then run
[notfound,warnings]=loadlibrary('MathLibrary.dll','MathLibrary.h');
Upon running this I get the warning
>Warning: No functions found in library.
>
>In C:\Program Files\MATLAB\R2014b\toolbox\matlab\general\loadlibrary.p>loadlibrary at 431
The cell array notfound is empty and warnings is an array with warnings = MathLibrary.h
If I try using one of the functions from the dll, I execute the following code:
calllib('MathLibrary','Add',5,3)
which throws the following error
>Error using calllib
>
>Method was not found.
I've tried Googling solutions to similar problems, but have not found solutions where I've looked (at least ones I've understood). My C++ is weak, which may be hindering my understanding of the problem and solution. I'm hoping to incorporate dll files from a much larger project soon, so understanding this would be a great help. Thanks so much!
I am wrapping a small c++ program in R by using Rcpp, and I checked beforehand that the c++ code is compiling directly with g++ 4.8.4 without warnings or errors. There are no external librairies, only STL is used.
When I compile my package in RStudio with devtools, I obtain the following error:
Updating PerseusR documentation
Loading PerseusR
Error in dyn.load(dllfile) :
unable to load shared object '/home/leonid/Documents/Programmation/PerseusR project/PerseusR/src/PerseusR.so':
/home/leonid/Documents/Programmation/PerseusR project/PerseusR/src/PerseusR.so: undefined symbol: _Z9lexicoPoslllRSt6vectorIlSaIlEE
Calls: suppressPackageStartupMessages ... -> load_all -> load_dll -> library.dynam2 -> dyn.load
Execution halted
Exited with status 1.
It seems that the compilation is fine and there is a problem with the loading of some dynamic libraries.
In the undefined symbol, lexicoPos is the name of a function in the c++ code.
Any ideas on how to solve this problem?
If your home-grown attempt fails, I suggest you start with a created example: Call Rcpp.package.skeleton() and compare all the files it creates with what you have.
Maybe you forgot the required line in NAMESPACE, maybe it is something -- we cannot tell from the information you supplied.
I built Qt from source (dlls) and am trying to build an application that uses the Qt dlls. I don't have a lot of experience with C++ so I'm running into what I'm sure is a very basic issue.
My builds are failing on the includes with errors like so:
Fatal error: QNetworkProxy: No such file or directory
Here is the g++ command I am using (I also used -L to add the correct folder to the lib path, but that also didn't work):
g++ -l..\..\wkqt\bin\QtCore4.dll -l..\..\wkqt\bin\QtNetwork4.dll -l..\..\wkqt\bin\QtWebKit4.dll -I..\include -Ishared -Ipdf -Ilib -Iimage -o ..\bin\wkhtmltopdf.exe pdf\*.cc lib\*.cc image\*.cc shared\*.cc
I tried in Visual Studio as well (assuming it wouldn't build, but I wanted to see if I could at least include the Qt dlls from there properly) and I am getting the same errors. Am I doing something wrong with the way I am compiling with g++? If I am linking with the Dlls properly then what is the proper way to use Qt functions from my code?
To clarify, I am not looking for how to properly use Qt. My question is: what is the proper way to use functions defined in any Dll from native C++ code? I apologize if this is a very basic question, but I'm unable to find a clear answer on Google and I don't have any experience with C++ and including third party libraries for use from C++ code.
DLLs can be used by dynamicly loading them and calling their used functions.
to call the exposed functions first define their syntax in the begining
suppose function is syntax is
BOOL MyFunction(int a,char* pszString)
then define syntax
#typedef BOOL (WINAPI *PMYFUNCTION)(int a,char* pszString)
then make object
PMYFUNCTION pfnMyFunction;
and get valid pointer by calling GetProcaddress after loadlibrarycall
HMODULE hlib= Loadlibrary("c:\\Mylib.dll");
if(hlib)
{ pfnMyFunction = (PMYFUNCTION)Getprocaddress(hlib,"MyFunction"); }
Hope this helps...