1
我正在開發一個Unity項目，並處理WebGL插件，它被Unity稱爲「jslib」。從直接c＃和jslib回調調用事件時會調用不同的函數簽名c＃
雖然統一推薦使用UnitySendMessage當jslib與c＃交互時，我更喜歡使用委託作爲回調。在一個小測試代碼中，它工作。但是當它運行到觸發事件代碼時，會發生奇怪的錯誤。
C＃：
public class Test : MonoBehaviour {
public void Start()
{
UserLoginDispatcher.GetInstance().onLoginOver += onLoginOver;
}
public void OnDestroy()
{
UserLoginDispatcher.GetInstance().onLoginOver -= onLoginOver;
}
//[MonoPInvokeCallback(typeof(System.Action<string, string, SDKError>))]
public static void onLoginOver(string context, string pluginId, SDKError err)
{
string errmsg = err == null ? "" : err.errmsg;
LogFormat ("Login Over with context " + context + ", pluginId " + pluginId + ", errmsg:" + errmsg);
}
static void LogFormat(string format, params object[] param)
{
string log = string.Format (format, param);
Debug.Log (log);
}
}
public class UserLoginDispatcher {
private static UserLoginDispatcher s_Instance = new UserLoginDispatcher();
public static UserLoginDispatcher GetInstance()
{
return s_Instance;
}
public delegate void UserLoginCallback(string context, string pluginId, SDKError error);
public event UserLoginCallback onLoginOver;
public void ProcessLoginOver(string context, string pluginId, SDKError error)
{
onLoginOver (context, pluginId, error);
}
}
public class WebGLPluginManager
{
[DllImport("__Internal")]
private static extern int Plugin_addLoginOverCB (LoginCBDelegate nativeCb);
private delegate void LoginCBDelegate(string context, string pluginId, int errno, int channelerrno, string errmsg);
[MonoPInvokeCallback(typeof(LoginCBDelegate))]
private static void OnLoginOver(string context, string pluginId, int errno, int channelerrno, string errmsg)
{
SDK.GetInstance().loginDispatcher.ProcessLoginOver (context, pluginId, new SDKError (errno, channelerrno, errmsg));
}
public void Init()
{
Plugin_addLoginOverCB(OnLoginOver);
}
}
在jslib：
...//login succeed:
Runtime.dynCall("viiiii", .....);
雖然ProcessLoginOver在UserLoginDispatcher被調用時，onLoginOver在測試拋出一個錯誤：
無效的函數指針調用署名「VIIII 」。也許這是一個無效的值（例如通過在NULL指針上調用虛擬方法造成的）？或者調用一個錯誤類型的函數，這會失敗？ （這是值得建立你的源文件與-Werror（警告是錯誤），因爲警告可能表明未定義的行爲，可能會導致此）
但如果我嘗試直接在C＃代碼中調用此事件，它可以被成功觸發。
錯誤調用堆棧：
Uncaught abort(68) at Error
at jsStackTrace (blob:http://localhost:60912/134eecaa-92a2-4615-b5b2-0a2ab6d2ed73:23794:12)
at stackTrace (blob:http://localhost:60912/134eecaa-92a2-4615-b5b2-0a2ab6d2ed73:23808:11)
at abort (blob:http://localhost:60912/134eecaa-92a2-4615-b5b2-0a2ab6d2ed73:464638:43)
at nullFunc_viiii (blob:http://localhost:60912/134eecaa-92a2-4615-b5b2-0a2ab6d2ed73:50912:2)
at Array.b68 (blob:http://localhost:60912/134eecaa-92a2-4615-b5b2-0a2ab6d2ed73:455121:2)
at ftCall_viiii (eval at loadDynamicLibrary (blob:http://localhost:60912/134eecaa-92a2-4615-b5b2-0a2ab6d2ed73:23235:19), <anonymous>:6602:49)
at mftCall_viiii (eval at loadDynamicLibrary (blob:http://localhost:60912/134eecaa-92a2-4615-b5b2-0a2ab6d2ed73:23235:19), <anonymous>:732323:2)
at _UserLoginCallback_Invoke_m2599958513 (eval at loadDynamicLibrary (blob:http://localhost:60912/134eecaa-92a2-4615-b5b2-0a2ab6d2ed73:23235:19), <anonymous>:533179:4)
at _UserLoginCallback_Invoke_m2599958513 (eval at loadDynamicLibrary (blob:http://localhost:60912/134eecaa-92a2-4615-b5b2-0a2ab6d2ed73:23235:19), <anonymous>:533170:14)
at _UserLoginDispatcher_ProcessLoginOver_m2254139378 (eval at loadDynamicLibrary (blob:http://localhost:60912/134eecaa-92a2-4615-b5b2-0a2ab6d2ed73:23235:19), <anonymous>:562185:2)
at _WebGLPluginManager_OnLoginOver_m1528063286 (eval at loadDynamicLibrary (blob:http://localhost:60912/134eecaa-92a2-4615-b5b2-0a2ab6d2ed73:23235:19), <anonymous>:548824:2)
at Array.asm._WebGLPluginManager_OnLoginOver_m1528063286 (eval at loadDynamicLibrary (blob:http://localhost:60912/134eecaa-92a2-4615-b5b2-0a2ab6d2ed73:23235:19), <anonymous>:921460:59)
....
直接C＃調用
Login Over with context a test session 12:13:28, pluginId DefaultUserLogin, errmsg:
at __Z13GetStacktracei [GetStacktrace(int)] (blob:http://localhost:60912/6467252d-2f87-4a2c-9967-31868825bff3:2275897:2)
at __Z17DebugStringToFileRK21DebugStringToFileData [DebugStringToFile(DebugStringToFileData const&)] (blob:http://localhost:60912/6467252d-2f87-4a2c-9967-31868825bff3:1247009:5)
at __Z17DebugStringToFilePKciS0_i15LogMessageFlagsiiPFvRK11CppLogEntryE [DebugStringToFile(char const*, int, char const*, int, LogMessageFlags, int, int, void (*)(CppLogEntry const&))] (blob:http://localhost:60912/6467252d-2f87-4a2c-9967-31868825bff3:2562904:2)
at __Z35DebugLogHandler_CUSTOM_Internal_Log7LogTypeP12Il2CppStringP12Il2CppObject [DebugLogHandler_CUSTOM_Internal_Log(LogType, Il2CppString*, Il2CppObject*)] (blob:http://localhost:60912/6467252d-2f87-4a2c-9967-31868825bff3:2126846:2)
at Array.UnityLoader.d9fd6255ccad354c9cc5ad72abf13dcc.asm.__Z35DebugLogHandler_CUSTOM_Internal_Log7LogTypeP12Il2CppStringP12Il2CppObject [DebugLogHandler_CUSTOM_Internal_Log(LogType, Il2CppString*, Il2CppObject*)] (blob:http://localhost:60912/134eecaa-92a2-4615-b5b2-0a2ab6d2ed73:145057:93)
at ftCall_viii (eval at loadDynamicLibrary (blob:http://localhost:60912/134eecaa-92a2-4615-b5b2-0a2ab6d2ed73:23235:19), <anonymous>:7197:48)
at mftCall_viii (eval at loadDynamicLibrary (blob:http://localhost:60912/134eecaa-92a2-4615-b5b2-0a2ab6d2ed73:23235:19), <anonymous>:747533:2)
at _DebugLogHandler_Internal_Log_m1116757358 (eval at loadDynamicLibrary (blob:http://localhost:60912/134eecaa-92a2-4615-b5b2-0a2ab6d2ed73:23235:19), <anonymous>:719622:2)
at Array._DebugLogHandler_LogFormat_m2613962716 (eval at loadDynamicLibrary (blob:http://localhost:60912/134eecaa-92a2-4615-b5b2-0a2ab6d2ed73:23235:19), <anonymous>:620933:2)
at mftCall_viiiiii (eval at loadDynamicLibrary (blob:http://localhost:60912/134eecaa-92a2-4615-b5b2-0a2ab6d2ed73:23235:19), <anonymous>:708880:40)
at __ZN23InterfaceActionInvoker4IiP18Object_t3753624189P8String_tP24ObjectU5BU5D_t2405707486E6InvokeEjP11Il2CppClassP12Il2CppObjectiS1_S3_S5_ [InterfaceActionInvoker4<int, Object_t3753624189*, String_t*, ObjectU5BU5D_t2405707486*>::Invoke(unsigned int, Il2CppClass*, Il2CppObject*, int, Object_t3753624189*, String_t*, ObjectU5BU5D_t2405707486*)] (eval at loadDynamicLibrary (blob:http://localhost:60912/134eecaa-92a2-4615-b5b2-0a2ab6d2ed73:23235:19), <anonymous>:394923:2)
at Array._Logger_Log_m314997607 (eval at loadDynamicLibrary (blob:http://localhost:60912/134eecaa-92a2-4615-b5b2-0a2ab6d2ed73:23235:19), <anonymous>:564686:3)
at mftCall_viiii (eval at loadDynamicLibrary (blob:http://localhost:60912/134eecaa-92a2-4615-b5b2-0a2ab6d2ed73:23235:19), <anonymous>:732320:39)
at __ZN23InterfaceActionInvoker2IiP12Il2CppObjectE6InvokeEjP11Il2CppClassS1_iS1_ [InterfaceActionInvoker2<int, Il2CppObject*>::Invoke(unsigned int, Il2CppClass*, Il2CppObject*, int, Il2CppObject*)] (eval at loadDynamicLibrary (blob:http://localhost:60912/134eecaa-92a2-4615-b5b2-0a2ab6d2ed73:23235:19), <anonymous>:412747:2)
at _Debug_Log_m2324883804 (eval at loadDynamicLibrary (blob:http://localhost:60912/134eecaa-92a2-4615-b5b2-0a2ab6d2ed73:23235:19), <anonymous>:619913:2)
at _Test_LogFormat_m983122927 (eval at loadDynamicLibrary (blob:http://localhost:60912/134eecaa-92a2-4615-b5b2-0a2ab6d2ed73:23235:19), <anonymous>:579589:2)
at Array._Test_onLoginOver_m2512123873 (eval at loadDynamicLibrary (blob:http://localhost:60912/134eecaa-92a2-4615-b5b2-0a2ab6d2ed73:23235:19), <anonymous>:383768:2)
at mftCall_viiiii (eval at loadDynamicLibrary (blob:http://localhost:60912/134eecaa-92a2-4615-b5b2-0a2ab6d2ed73:23235:19), <anonymous>:720078:40)
at _UserLoginCallback_Invoke_m2599958513 (eval at loadDynamicLibrary (blob:http://localhost:60912/134eecaa-92a2-4615-b5b2-0a2ab6d2ed73:23235:19), <anonymous>:533182:4)
at _UserLoginDispatcher_ProcessLoginOver_m2254139378 (eval at loadDynamicLibrary (blob:http://localhost:60912/134eecaa-92a2-4615-b5b2-0a2ab6d2ed73:23235:19), <anonymous>:562185:2)
....
我注意到，在直接C＃調用，dynCall在jslib通話使用mftCall_viiiii，同時，該堆棧dynCall使用mftCall_viiii，可能這就是爲什麼函數調用失敗。這很奇怪，爲什麼會發生這種情況？