Question

我正在执行一些与网络相关的代码。当代码开始执行并且用户在后台发送应用程序时，如果异常引发则应用程序被杀死。如果没有引发异常应用程序未被杀死。是否可以停止/暂停任何类型的网络活动？还是一种阻止应用程序被杀的方法？

更新

我正在使用matt gallahar（cocoa with love）写的uncaughtexception处理程序。如何解除请求后如何取消请求。请求代码在此函数中调用

+(NSString*)validate:(NSString*)username password:(NSString*)password server:(NSString*)server port:(int)port encryption:(int)encryption authentication:(int)authentication folders:(NSMutableArray*)folders {
    CTCoreAccount* account = [[CTCoreAccount alloc] init];

    @try   {
        [account connectToServer:server port:port connectionType:encryption authType:authentication login:username password:password];
    } @catch (NSException *exp) {
        NSLog(@"connect exception: %@", exp);
        return [NSString stringWithFormat:@"Connect error: %@", [ImapFolderWorker decodeError:exp]]; 
    }
}


- (void)connectToServer:(NSString *)server port:(int)port 
        connectionType:(int)conType authType:(int)authType
        login:(NSString *)login password:(NSString *)password {
    int err = 0;
    int imap_cached = 0;

    const char* auth_type_to_pass = NULL;
    if(authType == IMAP_AUTH_TYPE_SASL_CRAM_MD5) {
        auth_type_to_pass = "CRAM-MD5";
    }

    err = imap_mailstorage_init_sasl(myStorage,
                                     (char *)[server cStringUsingEncoding:NSUTF8StringEncoding],
                                     (uint16_t)port, NULL,
                                     conType,
                                     auth_type_to_pass,
                                     NULL,
                                     NULL, NULL,
                                     (char *)[login cStringUsingEncoding:NSUTF8StringEncoding], (char *)[login cStringUsingEncoding:NSUTF8StringEncoding],
                                     (char *)[password cStringUsingEncoding:NSUTF8StringEncoding], NULL,
                                     imap_cached, NULL);

    if (err != MAIL_NO_ERROR) {
        NSException *exception = [NSException
                exceptionWithName:CTMemoryError
                reason:CTMemoryErrorDesc
                userInfo:nil];
        [exception raise];
    }

    err = mailstorage_connect(myStorage);
    if (err == MAIL_ERROR_LOGIN) {
        NSException *exception = [NSException
                exceptionWithName:CTLoginError
                reason:CTLoginErrorDesc
                userInfo:nil];
        [exception raise];
    }
    else if (err != MAIL_NO_ERROR) {
        NSException *exception = [NSException
                exceptionWithName:CTUnknownError
                reason:[NSString stringWithFormat:@"Error number: %d",err]
                userInfo:nil];
        [exception raise];
    }
    else    
        connected = YES;
}

发生异常如果我输入不同的端口号，那么异常会在以下行中引发

NSException *exception = [NSException
                    exceptionWithName:CTUnknownError
                    reason:[NSString stringWithFormat:@"Error number: %d",err]
                    userInfo:nil];
            [exception raise]; // this line kills the app if the app is in background.

这些功能在MailCore库中。现在，如果有人知道解决方案，请帮助我。

Answer 1

您是否为您的应用程序注册了uncaughtExceptionHandler？此外，Apple确实建议您在关闭之前取消任何打开的网络请求（或者至少为它们做好准备以使其失败）（使用- (void)applicationDidEnterBackground:(UIApplication *)application）。请参阅＆＃34;成为负责任的背景应用程序＆＃34;此链接的一部分：https://developer.apple.com/library/ios/DOCUMENTATION/iPhone/Conceptual/iPhoneOSProgrammingGuide/ManagingYourApplicationsFlow/ManagingYourApplicationsFlow.html#//apple_ref/doc/uid/TP40007072-CH4-SW47

如果在后台引发，NSException会终止应用程序

1 个答案: