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I'm currently developing a native plugin for a Capcitor app. I have very little experience with native iOS development, Swift and Obj-C. I use a framework (FunSDK) which is written in C++. I call this in an Objective-C++ wrapper. As described here: https://medium.com/@cecilia.humlelu/set-up-c-library-dependencies-in-swift-projects-5dc2ccd2ddaf The wrapper is then available in Swift via the bridging header. This works so far, I can call the functions from the framework and they are executed correctly. However, the functions of the framework are executed asynchronously. When a result is obtained, the “OnFunSDKResult” method is always executed. During this step I get an EXC_BAD_ACCESS error while debugging. Then I ticked “Zombie objects” under the diagnostics settings. This causes execution to stop with an EXC_BREAKPOINT. As I understand it, after executing the iniXMSDK method, the FunSDKWrapper class is cleared from memory before executing the "OnFunSDKResult" method? I have also already integrated a completionHandler, which is only called in the "OnFunSDKResult" method so that data is transferred to the Swift class. However, that doesn't help either. I have no idea how to proceed. I hope somebody can help me. If you need any more information, I would be happy to provide it. The FunSDKWrapper.mm // // FunSDKWrapper.m // App // // Created by Sysprobs on 12/8/23. // #import "FunSDKWrapper.h" #import "FunSDK/FunSDK.h" #import <XMNetInterface/Reachability.h> @implementation FunSDKWrapper -(NSString *)iniXMSDK:(int)test completion:(void (^)(int result))completionHandler{ self.initCompletionHandler = completionHandler; self.msgHandle = FUN_RegWnd((__bridge void *)self); FUN_Init(); Fun_LogInit(self.msgHandle, "", 0, "", LOG_UI_MSG); FUN_XMCloundPlatformInit("***", "***", "***", 1); FUN_InitNetSDK(); FUN_SetFunStrAttr(EFUN_ATTR_SAVE_LOGIN_USER_INFO,SZSTR([self GetDocumentPathWith:@"UserInfo.db"])); FUN_SetFunStrAttr(EFUN_ATTR_USER_PWD_DB, SZSTR([self GetDocumentPathWith:@"password.txt"])); FUN_SetFunStrAttr(EFUN_ATTR_UPDATE_FILE_PATH,SZSTR([self GetDocumentPathWith:@""])); FUN_SetFunStrAttr(EFUN_ATTR_TEMP_FILES_PATH,SZSTR([self GetDocumentPathWith:@""])); FUN_SetFunIntAttr(EFUN_ATTR_AUTO_DL_UPGRADE, 0); FUN_SetFunStrAttr(EFUN_ATTR_CONFIG_PATH,SZSTR([self GetDocumentPathWith:@"APPConfigs"])); FUN_SetFunIntAttr(EFUN_ATTR_SUP_RPS_VIDEO_DEFAULT, 1); FUN_SetFunIntAttr(EFUN_ATTR_SET_NET_TYPE, [self getNetworkType]); FUN_SysInit("arsp.xmeye.net;arsp1.xmeye.net;arsp2.xmeye.net", 15010); FUN_InitNetSDK(); FUN_SysGetDevList(self.msgHandle, SZSTR(@"xxxx") , SZSTR(@"xxxx"),0); return @"test"; } - (void)searchLanDevices { FUN_DevSearchDevice(self.msgHandle, 4000, 0); } // NSDocument/fileName - (NSString *)GetDocumentPathWith:(NSString *) fileName { NSString* path = [self documentsPath]; if (fileName != nil) { path = [path stringByAppendingString:@"/"]; path = [path stringByAppendingString:fileName]; } return path; } //NSDocument - (NSString *)documentsPath { NSArray *pathArray = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *path = [pathArray lastObject]; return path; } -(int)getNetworkType { Reachability*reach=[Reachability reachabilityWithHostName:@"www.apple.com"]; //判断当前的网络状态 switch([reach currentReachabilityStatus]){ case ReachableViaWiFi: return 1; case ReachableViaWWAN: return 2; default: return 0; break; } } - (void)OnFunSDKResult:(NSNumber *) pParam { NSInteger nAddr = [pParam integerValue]; MsgContent *msg = (MsgContent *)nAddr; switch (msg->id) { case EMSG_SYS_GET_DEV_INFO_BY_USER:{ self.initCompletionHandler(1); if (msg->param1 < 0){ //fehler NSLog(@"Fehler beim XMCloud login"); }else{ char devJson[750*500]; FUN_GetFunStrAttr(EFUN_ATTR_GET_USER_ACCOUNT_DATA_INFO, devJson, 750*500); NSLog(@"Geraeteliste: = %s",devJson); } } break; } } @end The Swift Class import Foundation import Capacitor /** * Please read the Capacitor iOS Plugin Development Guide * here: https://capacitorjs.com/docs/plugins/ios */ @objc(xmsdkPlugin) public class xmsdkPlugin: CAPPlugin { private let implementation = xmsdk() @objc func echo(_ call: CAPPluginCall) { let value = call.getString("value") ?? "" call.resolve([ "value": implementation.echo(value) ]) } @objc func initXMSDK(_ call: CAPPluginCall) { //let devId = call.getString("devId") ?? "" let wrapper = FunSDKWrapper(); let resp = wrapper.iniXMSDK(1, completion: {(result) -> Void in NSLog("Completion von iniXMSDK") }); call.resolve([ "status": resp ]) } } Errorlog with EXC_BREAKPOINT: