[英]How to use the .js and .wasm artifacts emitted by Emscripten and Embind?
我有两个相当简单的 C++ class 定义及其接口uuid.{hpp,cpp}
和uuid_util.{hpp,cpp}
,我还有一个文件uuid_bind.cpp
与#include <emscripten/bind.h>
绑定。 C++ classes, function and static function definitions to JavaScript.
The two classes are first built as a static library uuid_lib.a
, which is then linked against the latter C++ source file and built with em++ --bind -o uuid_module.js uuid_bind.cpp uuid_lib.a
(which CMake generates) to generate uuid_module.js
和uuid_module.wasm
。 现在,我该怎么处理这些?
Embind 上的文档有些稀疏,只说
生成的quick_example.js文件可以作为节点模块或通过
<script>
标签加载: ...
我找到了这个关于结合 Emscripten/Embind 和 node.js 的 Google 教程,并且我已经尽可能多地复制了它(不包括 Docker 上的位,因为我的 ZEDC9F0A5A5D57797BF68E3736474383Z 分发直接服务)。 我有一个index.html
和一个package.json
文件,并且npm test
启动 Chrome http-server
的 ZBB30E85411B56DF41296726
我的印象是 Emscripten/Embind 将简单地用作任何绑定类、函数(静态或其他)、变量的转换层,并且可以直接从 JavaScript 调用,但事实证明并非如此. 我在这里错过了什么吗? 我对JS不是很熟悉。 我想在index.js
中做的就是:
index.js
import uuid_module from './uuid_lib.js';
console.log(uuid_module.uuid_util.generate_type1_uuid("BLA"));
// ... other calls
并使用node index.js
运行它,它会将 UUID 字符串打印到控制台。
作为背景,我在下面提供了我的CMakeLists.txt
和uuid_bind.cpp
。
CMakeLists.txt
cmake_minimum_required(VERSION 3.16)
# Set project file
project(
uuid_generator
VERSION 1.0
DESCRIPTION "A UUID generator"
LANGUAGES CXX)
# Export compile commands for clangd
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
# Add Emscripten CMake toolchain file
if(EMSCRIPTEN)
message("Using Emscripten.")
set(CMAKE_TOOLCHAIN_FILE
${PROJECT_SOURCE_DIR}/deps/emsdk/upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake)
else()
message("Using system compilers.")
endif(EMSCRIPTEN)
# C++20 guaranteed, no extensions eg. GNU/MSVC
set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)
# Strict compilation for MSVC or GCC/Clang
if(MSVC)
add_compile_options(/W4 /WX)
else()
add_compile_options(-Wall -Wextra -pedantic)
endif()
# Add uuid_generator as a shared library
add_library(uuid_lib STATIC src/uuid.cpp src/uuid_util.cpp)
# Set C++ library properties: output name, location, etc
set_target_properties(
uuid_lib
PROPERTIES OUTPUT_NAME uuid_lib
PREFIX ""
ARCHIVE_OUTPUT_DIRECTORY ${PROJECT_SOURCE_DIR}/dist)
# Set JS binding application properties: set bind, output type, etc. Runs only if Emscripten is enabled.
if(DEFINED ENV{EMSDK})
add_executable(uuid_module src/uuid_bind.cpp)
set_target_properties(
uuid_module
PROPERTIES OUTPUT_NAME uuid_module
SUFFIX ".js"
RUNTIME_OUTPUT_DIRECTORY ${PROJECT_SOURCE_DIR}/dist)
target_include_directories(uuid_module
PRIVATE ${PROJECT_SOURCE_DIR}/deps/emsdk/upstream/emscripten/system/include)
target_link_libraries(uuid_module uuid_lib)
target_link_options(
uuid_module
PUBLIC
$<$<CONFIG:DEBUG>:
-v
--bind
-sEXCEPTION_DEBUG=1
-sDEMANGLE_SUPPORT=1
-sDISABLE_EXCEPTION_CATCHING=1
-sWASM_BIGINT=1
-sMODULARIZE=1
-sEXPORT_ES6=1
-sEXPORT_NAME=uuid_module
>)
endif(DEFINED ENV{EMSDK})
uuid_bind.cpp
#include "uuid.hpp"
#include "uuid_util.hpp"
#include <cstdint>
#include <emscripten.h>
#include <emscripten/bind.h>
#include <string>
#include <iostream>
EMSCRIPTEN_BINDINGS(uuid_generator)
{
emscripten::constant("UINT29_MAX", uuid_gen::uuid::UINT29_MAX);
emscripten::constant("ICAO_ADDRESS_MAX", uuid_gen::uuid_util::ICAO_ADDRESS_MAX);
emscripten::constant("MAC_ADDRESS_MAX", uuid_gen::uuid_util::MAC_ADDRESS_MAX);
emscripten::constant("RANDOM_NAMESPACE_MAX", uuid_gen::uuid_util::RANDOM_NAMESPACE_MAX);
emscripten::class_<uuid_gen::uuid>("uuid")
.property("namespace_type", &uuid_gen::uuid::get_namespace_type)
.property("namespace_value", &uuid_gen::uuid::get_namespace_value)
.property("namespace_string", &uuid_gen::uuid::get_namespace_string)
.property("to_string", &uuid_gen::uuid::to_string)
.class_function("uniform_int_distr", &uuid_gen::uuid::uniform_int_dist);
emscripten::class_<uuid_gen::uuid_util>("uuid_util")
.class_function("generate_type1_uuid", &uuid_gen::uuid_util::generate_type1_uuid)
.class_function("generate_type2_uuid", &uuid_gen::uuid_util::generate_type2_uuid)
.class_function("generate_type3_uuid", &uuid_gen::uuid_util::generate_type3_uuid)
.class_function("generate_type4_uuid", &uuid_gen::uuid_util::generate_type4_uuid)
.class_function("generate_type5_uuid_str", emscripten::select_overload<uuid_gen::uuid(const std::string &)>(
&uuid_gen::uuid_util::generate_type5_uuid))
.class_function("generate_type5_uuid_int", emscripten::select_overload<uuid_gen::uuid(std::uint32_t)>(
&uuid_gen::uuid_util::generate_type5_uuid))
.class_function("generate_type6_uuid_str", emscripten::select_overload<uuid_gen::uuid(const std::string &)>(
&uuid_gen::uuid_util::generate_type6_uuid))
.class_function("generate_type6_uuid_int", emscripten::select_overload<uuid_gen::uuid(std::uint64_t)>(
&uuid_gen::uuid_util::generate_type6_uuid))
.class_function("generate_type7_uuid", &uuid_gen::uuid_util::generate_type7_uuid)
.class_function("from_string", &uuid_gen::uuid_util::from_string)
.class_function("is_valid_oper_agency", &uuid_gen::uuid_util::is_valid_oper_agency)
.class_function("is_valid_loc_atm_id", &uuid_gen::uuid_util::is_valid_loc_atm_id)
.class_function("is_valid_mac_address_string", &uuid_gen::uuid_util::is_valid_mac_address_string)
.class_function("namespace_char_encode", &uuid_gen::uuid_util::namespace_char_encode)
.class_function("namespace_char_decode", &uuid_gen::uuid_util::namespace_char_decode)
.class_function("namespace_encode", &uuid_gen::uuid_util::namespace_encode)
.class_function("namespace_decode", &uuid_gen::uuid_util::namespace_decode)
.class_function("mac_address_encode", &uuid_gen::uuid_util::mac_address_encode)
.class_function("mac_address_decode", &uuid_gen::uuid_util::mac_address_decode);
};
我在这里错过了什么吗?
您缺少的是在-s MODULARIZE=1
模式下,默认导出是工厂,而不是模块 object 本身。
您需要先创建一个模块,然后您应该能够访问公开的属性:
import uuidModuleFactory from './uuid_lib.js';
const uuid_module = uuidModuleFactory(/* optional Emscripten config goes here */);
console.log(uuid_module.uuid_util.generate_type1_uuid("BLA"));
// ... other calls
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