Thank you both for the quick responses. Floh, I will try this today. Geoffrey, I have tried your Generate Javascript Using MATLAB Coder add-on in MATLAB, but ran into issues. I posted those issues on the conversation that is on that add-on's page.
On Wednesday, April 14, 2021 at 5:13:16 AM UTC-7 gmcv...@gmail.com wrote: > Hello, > You may want to look at: > > https://www.mathworks.com/matlabcentral/fileexchange/69973-generate-javascript-using-matlab-coder > There is an update to be released soon that will resolve the issues shown > in the discussion. The existing add-on should work so long as you install > emscripten using the following flag: > > ./emsdk install 1.38.45 > > Hope this helps. > On Wednesday, April 14, 2021 at 7:43:02 AM UTC-4 Floh wrote: > >> Hi, I quickly cobbled together a "simplest possible sample" for calling a >> C function from JS here: >> >> https://github.com/floooh/emsc-interop-demo >> >> This is running in the browser though and it's a bit quick'n'dirty, but >> it should get you started at least >> for your own experimentations. The important things are the >> EMSCRIPTEN_KEEPALIVE annotation in the >> hello.c file, and the underscore in front of the addc() function call in >> Javascript in shell.html. >> >> If you cannot annotate the original source files with >> EMSCRIPTEN_KEEPALIVE, you can also provide the >> C functions names to make visible to Javascript with a compiler option >> instead, see here: >> >> >> https://emscripten.org/docs/getting_started/FAQ.html#why-do-functions-in-my-c-c-source-code-vanish-when-i-compile-to-javascript-and-or-i-get-no-functions-to-process >> >> I prefer to work with simple C-APIs instead of C++ APIs, because with >> C-APIs you >> can (more or less) call the functions directly from Javascript instead of >> creating a "language binding" >> between C++ and Javascript interfaces. For this, emscripten has a tool >> called "embind" (which adds a whole >> new level of complexity and more things that can break, but I guess >> that's personal opinion heh). >> There are some caveats with non-trivial function arguments (for instance >> pointers to data on the WASM heap), >> maybe embind makes this case easier, don't know. >> >> In any case, here's the embind documentation: >> >> >> https://emscripten.org/docs/porting/connecting_cpp_and_javascript/embind.html >> >> Hope this helps! >> >> On Wednesday, 14 April 2021 at 02:43:49 UTC+2 HJ wrote: >> >>> I am a beginner and I'm sure all the information is there, but I am >>> struggling to get even a basic example working. I can run the tutorial >>> example, but I can't get anything for the following: >>> >>> I have converted some MATLAB .m script files to C (MATLAB can convert to >>> C or CPP. I've tried both C and CPP in the below information.) >>> >>> MATLAB has 1 function per 1 file, so now I have two .c files with one c >>> function in each. >>> >>> I've run emcc to convert .c to .js >>> When I look in the a.out.js and search for "myfunct", all I see for my >>> function is the following and I'm not sure how to call it in my js main >>> program: >>> >>> /** @type {function(...*):?} */ var _myFunc = Module["_myFunc"] = >>> createExportWrapper("myFunc"); >>> >>> I've played around with many different command line parameters that I've >>> found on various Q&A forums, but still can't figure out how to create such >>> that there is a function called "myFunc" that I can call from my other js >>> files (actually typescript, but just assume js for this.) >>> >>> This code will be run on the server side, node.js, and not on a browser. >>> Backend code that will call these converted MATLAB functions to generate >>> data. >>> >>> It would be nice to have an example from beginning to end (I've been >>> searching and searching, but I only find answers that will say things like, >>> "You just need to use the xxxx option", but there is more to the puzzle >>> that I am missing. >>> >>> It seems like the examples on emscripten site are all self contained: >>> you build and run them, but no example of how to convert a function and how >>> to integrate it (call it) from other js code. I have read the many options, >>> but again I am not sure exactly what to do. I've also read the comments in >>> the produced js file about creating a module and searched, but I am not >>> sure how to define a module for a function. >>> >>> - What are the emcc parameters do I use? >>> - Can I convert just this one function or do I need to have a main() >>> that calls it? >>> - Once converted, it looks like I need to define a module for >>> "myfunc", but I am not sure how it is defined, when to define, do I add >>> after into the .js? >>> - What about using the WASM=0 option to only produce js and no WASM. >>> Maybe that is a route to take? (I tried and it produced some different >>> code >>> in .js, but i'm still stuck on what to do with it. >>> >>> I created the below simple function that takes a double and returns a >>> double for trying this. If anyone can show me the steps with this or any >>> HelloWorld that takes a parameter and returns it would be greatly >>> appreciated. (or even more complex example.) >>> >>> Thank helping this newbie! :-) >>> >>> *myFunc.c:* >>> >>> #include "myfunc.h" >>> double myfunc(double myInt) { >>> return myInt + 50.0; >>> } >>> >>> *myFunc.h:* >>> >>> #ifndef MYFUNC_H >>> #define MYFUNC_H >>> >>> /* Include Files */ >>> #include "rtwtypes.h" >>> #include <stddef.h> >>> #include <stdlib.h> >>> >>> #ifdef __cplusplus >>> extern "C" { >>> #endif >>> >>> /* Function Declarations */ >>> extern double myFunc(double myInt); >>> >>> #ifdef __cplusplus >>> } >>> #endif >>> >>> #endif >>> >> -- You received this message because you are subscribed to the Google Groups "emscripten-discuss" group. To unsubscribe from this group and stop receiving emails from it, send an email to emscripten-discuss+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/emscripten-discuss/545f735c-a1cd-4083-9d16-923fb69132a4n%40googlegroups.com.
