iLib | Library for various I2C-Sensors with examples for Arduino
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kandi X-RAY | iLib Summary
Library for various I2C-Sensors with examples for Arduino
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QUESTION
I got a project hierarchy that looks like this:
...ANSWER
Answered 2021-Apr-03 at 19:15The best way to do this is using VPATH.
For example:
QUESTION
I am wondering what steps, (such as shebang lines and wrapper scripts) are recommended when creating a CLI application in Raku. I am interested in info both for scripts that will be installed with Zef and those that will be distributed separately.
The docs provide the example frobnicate
program:
ANSWER
Answered 2021-Feb-24 at 22:52So I'm guessing Zef adds it?
CompUnit::Repository::Installation adds it
Why is it there? One reason is because some wrapper needs to manage bin scripts the same name that would otherwise clash if they were in the same directory.
Is there some way to use the run-script method shown above without Zef?
run-script is for CompUnit::Repository::Installation only -- if you aren't installing a module then run-script
won't be of interest
Assuming I do need to have my users download two files, where should I have them install the files?
Well the recommended/idiomatic way would be to use the core raku functionality to install things (i.e. use zef). Otherwise where you should put some code is either a) not going to matter or b) going to be mostly dependendant on your environment, what is idiomatic for your os, etc.
Does it need to be copied into their Raku module search path (and, if so, what command would show them what that path is)
echo $RAKULIB
should suffice for showing the module search path in most cases, especially if they aren't interested in where the installation paths are. And as such you can instruct users to set e.g. RAKULIB=$FROB_LIB_DIR
to point wherever your library is if you want them to be able to run your script without manually specifying it via raku -I../ frobnicate
(so they don't copy the code anywhere special, they just point to wherever they e.g. clone your repo). Ditto for working with $PATH
.
Or can I modify the frobnicate wrapper in some way (maybe by changing raku to raku -Ilib or something like that?) in a way that would let them install both to directory on their PATH?
I would advise against installing things based on some value in $PATH
. Instruct users to set $PATH
, don't install things to $PATH
.
Technically you could add use lib '../'
to your script, but using use lib
in a script that you also want users to install normally is less than ideal since its adding an unused, potentially hijackable module search path when being run from such an install.
If you want your code to precompile then I suggest putting it in a module, and instructing your users that, if they don't intent to install it, to invoke it via raku -I../ ./frobnicate
on a per-use basis or something like export RAKULIB="$FROB_LIB_DIR,$RAKULIB"
followed by ./frobnicate
for something more permanent. Alternatively if someone evenetually implements precompilation of scripts then you could just use the single file approach.
QUESTION
I tried to compile the example: echo_server_with_as_single_default.cpp
from boost examples on an:
- ubuntu 18.04
- boost 1.75.0
- g++ 10.1.0
Using the following commands to compile&link (I know it's not optimal, I reused the makefile from another project I am working on):
...ANSWER
Answered 2021-Jan-28 at 20:03Currently, coroutines are not enabled by default in gcc. You need to pass the -fcoroutines
compiler switch in order to enable them. This will probably change soon as it already works with the current gcc trunk version.
See here (I had to comment out the code in main due to the execution time cap in godbolt.org).
QUESTION
I am learning Cython and tried to run a simple example found here: making C library callable.
I used VS 2019 to create mylib.lib
and setup.py
to build the Cython-extension (for details and code see below), however the linker fails with error:
error LNK2001: unresolved external symbol hello
Yet when I ran nm mylib.lib
that I found in other post I can see that the symbol _hello
is present:
ANSWER
Answered 2020-Sep-21 at 09:54Rebuild the (static) library for x64.
The symbol in your library is called _hello
and not hello
as one would expect for a x64-build (your extension is built for 64bit as can be seen in the logs).
On x64, MSVC doesn't mangle names when compiling as C-code so the resulting symbol is simple - hello
, but it does mangle C-names on x86 (here documentation, here an example on godbolt.org):
__cdecl
-calling convention (default for x86 if no special compile-flags are used) adds prefix_
to the name which would lead to the symbol being called_hello
.__stdcall
-calling convention (if compiled with/Gz
or the calling convention is explicitly specified, i.e.void __stdcall hello(char *)
) adds prefix_
to the name and suffix@
with the number of bytes in the parameter list, i.e. it would lead to_hello@4
.
Thus, it becomes clear, that your library is built in 32bit and thus cannot be linked to a 64bit-dll.
Were the library a dll, the symbol's names would be slightly different. Calling
QUESTION
I am mostly working on Go projects atm, but I have to use CGO for part of my project on the purpose of editing TIF files from Go with C, because of parameter pass-through. I am not familiar with C, but it seems the only way to solve our problem.
The problem is when I theoretically set up the Go part, and wanted to use my C code, it drops undefined reference to
xxxx'` with TIFFGetField,_TIFFmalloc,TIFFReadRGBAImage function calls.
Probably I am not even importing the libtiff libary in the right way.
The funny thing is the first code of the C code itself is TIFF* tif = TIFFOpen("foo.tif", "w");
does not have reference error to TIFFOpen, only the others (TIFFGetField,_TIFFmalloc,TIFFReadRGBAImage,_TIFFfree,TIFFClose)
my go code is
...ANSWER
Answered 2020-Sep-21 at 03:26If you see the message "undefined reference to xxx" in cgo. It is very likely that you're missing the linking to the shared library.
I'm not quite familiar to this package, but i suggest you could try add something as below to make your program link to the C dynamic library:
QUESTION
I am a beginner in C#. What I want to do is return a list of 4 items. I map the Ebook items defined as an enum in BookList and I just want to return these items defined as an enum. However, there are multiple properties in the Lib class. I just don't know how to return them from the list.
If I do the same as in the commented line, all the properties in the list return. Also, I cannot return other enum items. I don't know how to do this.
Here is my mapping part:
...ANSWER
Answered 2020-Sep-20 at 01:36It seems like you just need to create a Lib
for each BookType with the respective TaxType:
QUESTION
I really can't figure this out. Clearly, zef
performs some kind of arrangement and precompilation of modules, but in this case it's really critical, since it simply seems to be using a different version of the code. For instance, running one of the test that fails,
ANSWER
Answered 2020-Aug-28 at 15:04zef doesn't use -Ilib
-- I personally consider telling people to use it harmful -- it uses -I.
QUESTION
I have a C project that combines multiple .c and .h files. Previously I just had all of these files in the top level directory, along with the following Makefile:
...ANSWER
Answered 2020-Aug-27 at 18:25So it seems that the windows version of MinGW has some definition issues. The following code added to my compiler's version of include/dirent.h
fixed the problem for me. Editing library functions is probably a bad idea generally, so only use this if you're feeling adventurous... I make no claims that this won't break all the things elsewhere.
QUESTION
I have the following dir structure (simplified version to reproduce the issue):
...ANSWER
Answered 2020-Jun-27 at 10:31Change use CLI;
to use CLI {}
.
Presuming the CLI
package is found, running this:
QUESTION
I do not see the result after I click the "Run" button
..."C:\Program Files\Edument Central Europe\Comma Community Edition 2020.01\bin\runnerw64.exe" C:\rakudo\bin\perl6.bat -Ilib C:\Users\quest\CommaProjects\monkey\monkey.p6
Process finished with exit code 0
ANSWER
Answered 2020-May-03 at 08:07I deleted the old version of the program, then installed the new version, without saving the settings from the previous version. Then File -> Project Structure -> set Project SDK
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