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July 7, 2024 19:15
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wasm file sharing between js and c
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| mkdir build && cd $_ | |
| emcmake cmake .. | |
| make | |
| emrun ../index.html |
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| cmake_minimum_required(VERSION 3.12) | |
| project(uppercase) | |
| set(CMAKE_CXX_STANDARD 14) | |
| add_executable(uppercase uppercase.cpp) | |
| set_target_properties(uppercase PROPERTIES LINK_FLAGS "-s WASM=1 -s EXPORTED_FUNCTIONS=['_uppercase_file'] -s EXPORTED_RUNTIME_METHODS=['ccall','cwrap','FS'] -s FORCE_FILESYSTEM=1") |
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| <!DOCTYPE html> | |
| <html> | |
| <body> | |
| <button id="createFileButton" disabled>Create File</button> | |
| <button id="processFileButton" disabled>Process File</button> | |
| <script src="build/uppercase.js"></script> | |
| <script> | |
| Module.onRuntimeInitialized = function() { | |
| document.getElementById('createFileButton').disabled = false; | |
| document.getElementById('processFileButton').disabled = false; | |
| document.getElementById('createFileButton').onclick = function() { | |
| FS.mkdir('/working'); | |
| let content = 'helloworld' | |
| FS.writeFile('/working/file.txt', content); | |
| console.log('File created with content: ' + content); | |
| }; | |
| document.getElementById('processFileButton').onclick = function() { | |
| var result = Module.ccall('uppercase_file', 'string', ['string'], ['/working/file.txt']); | |
| console.log(result); | |
| }; | |
| }; | |
| </script> | |
| </body> | |
| </html> |
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| #include <iostream> | |
| #include <fstream> | |
| #include <string> | |
| #include <algorithm> | |
| #include <emscripten.h> | |
| extern "C" { | |
| EMSCRIPTEN_KEEPALIVE | |
| char* uppercase_file(char* filename) { | |
| std::ifstream file(filename); | |
| std::string str((std::istreambuf_iterator<char>(file)), std::istreambuf_iterator<char>()); | |
| std::transform(str.begin(), str.end(), str.begin(), ::toupper); | |
| std::string result = "filename: "; | |
| result += filename; | |
| result += "\n"; | |
| result += "filesize: " + std::to_string(str.size()); | |
| result += "\n"; | |
| result += "filecontent (uppercase): " + str; | |
| char* cstr = new char[result.length() + 1]; | |
| std::strcpy(cstr, result.c_str()); | |
| return cstr; | |
| } | |
| } |
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when it works you should see this in the console