c - How do I read a user-specified file in an emscripten compiled library? -


i'm working on file parsing library in c emscripten compile support. takes file path user reads binary file , parses it.

i understand emscripten doesn't support direct loading of files, instead uses virtual filesystem. there way load file @ given path virtual filesystem emscripten compiled c lib can read it? i'm looking solutions both nodejs , in browser.

if want compile file directly library can use --preload-file or --embed-file option. this:

emcc main.cpp -o main.html --preload-file /tmp/my@/home/caiiiycuk/test.file

after in c can open file normally:

fopen("/home/caiiiycuk/test.file", "rb")

or can use emscripten javascript fs-api, example ajax:

$.ajax({     url: "/dataurl",     type: 'get',     beforesend: function (xhr) {         xhr.overridemimetype("text/plain; charset=x-user-defined");     },     success: function( data ) {         module['fs_createdatafile']("/tmp", "test.file", data, true, true);     } });

after can open file c. not best way pass data c code, can pass data directly in memory, read this.


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