如何在Unity/C#WebGL平台调用async/awaitJavaScript函数?
How to call async/await JavaScript function in Unity/C# WebGL platform?
我按照 this doc 在 Unity 中从我的 C# 脚本调用 JavaScript 函数来制作 WebGL 游戏。
但是如果js代码中包含async/await就会有问题,例如:
C# 脚本:
[DllImport("__Internal")]
private static extern void Foo();
[DllImport("__Internal")]
private static extern void Boo();
void Start(){
Foo();
Boo();
}
JavaScript mylib.jslib
mergeInto(LibraryManager.library, {
// works well
Foo: function () {
window.alert("Hello, world!");
},
// error: can't compile
Boo: async function (){
var s = function (ms) {
return new Promise(resolve => setTimeout(resolve, ms));
};
await s(2000);
window.alert("Boo!");
}
});
当我尝试构建这些代码时,它显示如下错误:
Failed process stderr log:
error: failure to execute js library "D:\CloudLinProject\Unity\My project\Assets\Plugins\Javascripts\PhantomAPI.jslib": SyntaxError: Unexpected token function,,SyntaxError: Unexpected token function
at Object.load (eval at globalEval (D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\src\compiler.js:105:8), <anonymous>:179:14)
at JSify (eval at globalEval (D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\src\compiler.js:105:8), <anonymous>:87:20)
at D:\CloudLinProject\Unity\My project\Assets\Plugins\Javascripts\PhantomAPI.jslib (D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\src\compiler.js:221:3)
at Module._compile (module.js:570:32)
at Object.Module._extensions..js (module.js:579:10)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
at Module.runMain (module.js:604:10)
at run (bootstrap_node.js:394:7)
preprocessed source (you can run a js engine on this to get a clearer error message sometimes):
Internal compiler error in src/compiler.js! Please raise a bug report at https://github.com/kripken/emscripten/issues/ with a log of the build and the input files used to run. Exception message: "SyntaxError: Unexpected token function" | SyntaxError: Unexpected token function
at Object.load (eval at globalEval (D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\src\compiler.js:105:8), <anonymous>:179:14)
at JSify (eval at globalEval (D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\src\compiler.js:105:8), <anonymous>:87:20)
at Object.<anonymous> (D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\src\compiler.js:221:3)
at Module._compile (module.js:570:32)
at Object.Module._extensions..js (module.js:579:10)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
at Module.runMain (module.js:604:10)
at run (bootstrap_node.js:394:7)
Traceback (most recent call last):
File "D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emcc.py", line 3063, in <module>
sys.exit(run())
File "D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emcc.py", line 1780, in run
final = shared.Building.emscripten(final, append_ext=False, extra_args=extra_args)
File "D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\tools\shared.py", line 2274, in emscripten
emscripten._main(cmdline)
File "D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emscripten.py", line 2233, in _main
return temp_files.run_and_clean(lambda: main(
File "D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\tools\tempfiles.py", line 93, in run_and_clean
return func()
File "D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emscripten.py", line 2238, in <lambda>
DEBUG=DEBUG,
File "D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emscripten.py", line 2164, in main
temp_files=temp_files, DEBUG=DEBUG)
File "D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emscripten.py", line 86, in emscript
glue, forwarded_data = compiler_glue(metadata, libraries, compiler_engine, temp_files, DEBUG)
File "D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emscripten.py", line 218, in compiler_glue
glue, forwarded_data = compile_settings(compiler_engine, libraries, temp_files)
File "D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emscripten.py", line 541, in compile_settings
cwd=path_from_root('src'), error_limit=300)
File "D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\tools\jsrun.py", line 132, in run_js
raise Exception('Expected the command ' + str(command) + ' to finish with return code ' + str(assert_returncode) + ', but it returned with code ' + str(proc.returncode) + ' instead! Output: ' + str(ret)[:error_limit])
Exception: Expected the command ['D:/Program Files/Unity/2020.3.22f1/Editor/Data\Tools\nodejs\node.exe', '--stack_size=8192', '--max-old-space-size=4096', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\src\compiler.js', 'C:\Users\eucyl\AppData\Local\Temp\tmpoqhbko.txt', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\Audio.js', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\case_1174367_workaround.js', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\case_1179945_workaround.js', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\case_1187965_workaround.js', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\case_1208971_workaround.js', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\Cursor.js', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\Eval.js', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\FileSystem.js', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\Logging.js', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\Profiler.js', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\SystemInfo.js', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\UnetWebSocket.js', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\Video.js', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\WebCam.js', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\WebRequest.js', 'D:\CloudLinProject\Unity\My project\Assets\Plugins\Javascripts\PhantomAPI.jslib', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\src\library_pthread_stub.js'] to finish with return code 0, but it returned with code 1 instead! Output: // The Module object: Our interface to the outside world. We import
// and export values on it. There are various ways Module can be used:
// 1. Not defined. We create it here
// 2. A function parameter, function(Module) { ..generated code.. }
// 3. pre-run appended it, var Module = {}; ..generated
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)
那么我应该如何处理 C# 中的 js async/await 函数?
tl;dr:就是这样。 c#
不需要注意 async
,它应该可以工作。
我刚刚使用
做了一个小测试
Assets/Plugins/mylib.jslib
mergeInto(LibraryManager.library, {
Foo: function () {
window.alert("Foo!");
},
Boo: async function () {
var s = function (ms) {
return new Promise(resolve => setTimeout(resolve, ms));
};
await s(2000);
window.alert("Boo!");
}
});
和
Assets/Exmaple.cs
public class Example : MonoBehaviour
{
[DllImport("__Internal")]
private static extern void Foo();
[DllImport("__Internal")]
private static extern void Boo();
void Awake()
{
Foo();
Boo();
}
}
这是没有任何问题的样子
因此,如果没有更多信息,我会声明:您的问题不是 async
,而是其他问题。
我按照 this doc 在 Unity 中从我的 C# 脚本调用 JavaScript 函数来制作 WebGL 游戏。
但是如果js代码中包含async/await就会有问题,例如:
C# 脚本:
[DllImport("__Internal")]
private static extern void Foo();
[DllImport("__Internal")]
private static extern void Boo();
void Start(){
Foo();
Boo();
}
JavaScript mylib.jslib
mergeInto(LibraryManager.library, {
// works well
Foo: function () {
window.alert("Hello, world!");
},
// error: can't compile
Boo: async function (){
var s = function (ms) {
return new Promise(resolve => setTimeout(resolve, ms));
};
await s(2000);
window.alert("Boo!");
}
});
当我尝试构建这些代码时,它显示如下错误:
Failed process stderr log:
error: failure to execute js library "D:\CloudLinProject\Unity\My project\Assets\Plugins\Javascripts\PhantomAPI.jslib": SyntaxError: Unexpected token function,,SyntaxError: Unexpected token function
at Object.load (eval at globalEval (D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\src\compiler.js:105:8), <anonymous>:179:14)
at JSify (eval at globalEval (D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\src\compiler.js:105:8), <anonymous>:87:20)
at D:\CloudLinProject\Unity\My project\Assets\Plugins\Javascripts\PhantomAPI.jslib (D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\src\compiler.js:221:3)
at Module._compile (module.js:570:32)
at Object.Module._extensions..js (module.js:579:10)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
at Module.runMain (module.js:604:10)
at run (bootstrap_node.js:394:7)
preprocessed source (you can run a js engine on this to get a clearer error message sometimes):
Internal compiler error in src/compiler.js! Please raise a bug report at https://github.com/kripken/emscripten/issues/ with a log of the build and the input files used to run. Exception message: "SyntaxError: Unexpected token function" | SyntaxError: Unexpected token function
at Object.load (eval at globalEval (D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\src\compiler.js:105:8), <anonymous>:179:14)
at JSify (eval at globalEval (D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\src\compiler.js:105:8), <anonymous>:87:20)
at Object.<anonymous> (D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\src\compiler.js:221:3)
at Module._compile (module.js:570:32)
at Object.Module._extensions..js (module.js:579:10)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
at Module.runMain (module.js:604:10)
at run (bootstrap_node.js:394:7)
Traceback (most recent call last):
File "D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emcc.py", line 3063, in <module>
sys.exit(run())
File "D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emcc.py", line 1780, in run
final = shared.Building.emscripten(final, append_ext=False, extra_args=extra_args)
File "D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\tools\shared.py", line 2274, in emscripten
emscripten._main(cmdline)
File "D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emscripten.py", line 2233, in _main
return temp_files.run_and_clean(lambda: main(
File "D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\tools\tempfiles.py", line 93, in run_and_clean
return func()
File "D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emscripten.py", line 2238, in <lambda>
DEBUG=DEBUG,
File "D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emscripten.py", line 2164, in main
temp_files=temp_files, DEBUG=DEBUG)
File "D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emscripten.py", line 86, in emscript
glue, forwarded_data = compiler_glue(metadata, libraries, compiler_engine, temp_files, DEBUG)
File "D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emscripten.py", line 218, in compiler_glue
glue, forwarded_data = compile_settings(compiler_engine, libraries, temp_files)
File "D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emscripten.py", line 541, in compile_settings
cwd=path_from_root('src'), error_limit=300)
File "D:\Program Files\Unity20.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\tools\jsrun.py", line 132, in run_js
raise Exception('Expected the command ' + str(command) + ' to finish with return code ' + str(assert_returncode) + ', but it returned with code ' + str(proc.returncode) + ' instead! Output: ' + str(ret)[:error_limit])
Exception: Expected the command ['D:/Program Files/Unity/2020.3.22f1/Editor/Data\Tools\nodejs\node.exe', '--stack_size=8192', '--max-old-space-size=4096', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\src\compiler.js', 'C:\Users\eucyl\AppData\Local\Temp\tmpoqhbko.txt', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\Audio.js', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\case_1174367_workaround.js', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\case_1179945_workaround.js', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\case_1187965_workaround.js', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\case_1208971_workaround.js', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\Cursor.js', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\Eval.js', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\FileSystem.js', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\Logging.js', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\Profiler.js', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\SystemInfo.js', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\UnetWebSocket.js', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\Video.js', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\WebCam.js', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\WebRequest.js', 'D:\CloudLinProject\Unity\My project\Assets\Plugins\Javascripts\PhantomAPI.jslib', 'D:\Program Files\Unity\2020.3.22f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\src\library_pthread_stub.js'] to finish with return code 0, but it returned with code 1 instead! Output: // The Module object: Our interface to the outside world. We import
// and export values on it. There are various ways Module can be used:
// 1. Not defined. We create it here
// 2. A function parameter, function(Module) { ..generated code.. }
// 3. pre-run appended it, var Module = {}; ..generated
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)
那么我应该如何处理 C# 中的 js async/await 函数?
tl;dr:就是这样。 c#
不需要注意 async
,它应该可以工作。
我刚刚使用
做了一个小测试Assets/Plugins/mylib.jslib
mergeInto(LibraryManager.library, {
Foo: function () {
window.alert("Foo!");
},
Boo: async function () {
var s = function (ms) {
return new Promise(resolve => setTimeout(resolve, ms));
};
await s(2000);
window.alert("Boo!");
}
});
和
Assets/Exmaple.cs
public class Example : MonoBehaviour
{
[DllImport("__Internal")]
private static extern void Foo();
[DllImport("__Internal")]
private static extern void Boo();
void Awake()
{
Foo();
Boo();
}
}
这是没有任何问题的样子
因此,如果没有更多信息,我会声明:您的问题不是 async
,而是其他问题。