I am trying to add an extension, that adds two functions to an array of FloatingPoint types. I added to and extension to get a myDesibe var: extension FloatingPoint { public var myDescribe:String { return String(format:"%.3f",self as! CVarArg) } } This works fine (or seems to) On the collection, I want to add two methods/vars. One method returns a string with command delimited values: public extension Array where Element: FloatingPoint { var myDescribe:String { var rvalue = "" for (index,entry) in self.enumerated() { var format = ",%@" if (index == 0) { format = "%@" } rvalue += String(format: format, entry.myDescribe) } return rvalue } } That seems to be working fine. The other I wan to pass the command delimited string in, and get an array of the type of elements of the Array. This does not work: public extension Array where Element: FloatingPoint { var myDescribe:String { func fromDescription(desribe:String) -> [Element] { var rvalue = [Element]() for entry in desribe.components(separatedBy: ",") { let trimmed = entry.trimmingCharacters(in: .whitespaces) let temp = FloatLiteralType(trimmed) ?? FloatLiteralType.zero // Now, how to convert this so I can append this in the array? This is the issue!! rvalue.append(temp) // << THIS FAILS, as it wants an Int which I don't `understand` } return rvalue } } All help is appreciated Charles

Does anyone have the format string to use to just get the 24 hour time (no am/pm) indicator from Date? I can't seem to get 24 hour time with: let now = Date() now.formatted(date:.omitted,time:.complete) // Or any of the time options.

I am trying to do a connection, with NWConneciton, and wanted to know if the connect fails? I can't seem to determine what status I should look for

I have a NWConnection, that if an invalid (ip/port), is entered, I get in debug the error: nw_socket_handle_socket_event [C1.1.1:1] Socket SO_ERROR 61. But I can't seem to trap that error. I have as my stateChangeHandler: I am creating my connection: let tcpOptions = NWProtocolTCP.Options() tcpOptions.enableKeepalive = true tcpOptions.keepaliveIdle = 2 tcpOptions.keepaliveCount = 2 tcpOptions.keepaliveInterval = 2 let params = NWParameters(tls: nil, tcp: tcpOptions) nwConnection:NWConnection(host: NWEndpoint.Host(host), port: NWEndpoint.Port(port)!, using: params). (with known nonexistent ip/port). I was hopping when I did a .start(), I would get an error in my state handler: // =============================================================================== func stateDidChange(to state: NWConnection.State) { Swift.print("State change") switch state { case .waiting(let error): print("Client waiting") connectionDidFail(error: error) case .ready: print("Client connection ready") case .failed(let error): print("Client failed") connectionDidFail(error: error) case .preparing: print("client preparing") case .setup: print("client setup") case .cancelled: print("client cancelled") default: print("Client unknown") break } } But it doesn't trap an error. So, where is this error coming from (I know the cause), but I want to trap it (in case a user puts in a wrong ip/port)

I have some Objective C code, that I can not find the equivalent for Swift (many symbols are not present). It just lists all serial devices that match a prefix: + (NSArray*)serialDevicesWithPrefix:(NSString*)prefix { NSMutableArray* modems=[NSMutableArray arrayWithCapacity:10]; kern_return_t kernResult; mach_port_t masterPort ; CFMutableDictionaryRef classesToMatch; io_iterator_t matchingServices; NSString* serialDevice=@"/dev/cu."; serialDevice=[serialDevice stringByAppendingString:prefix]; // Lets find all serial device types ; // Get the port for communications to kernal kernResult = IOMainPort(kIOMainPortDefault, &masterPort) ; if (kernResult == KERN_SUCCESS) { // We got a good result! classesToMatch = IOServiceMatching(kIOSerialBSDServiceValue) ; if (classesToMatch != NULL) { // Now, we need to say we are looking for RS232 type of connections // Each serial device object has a property with key // kIOSerialBSDTypeKey and a value that is one of // kIOSerialBSDAllTypes, kIOSerialBSDModemType, // or kIOSerialBSDRS232Type. You can change the // matching dictionary to find other types of serial // devices by changing the last parameter in the above call // to CFDictionarySetValue. CFDictionarySetValue(classesToMatch, CFSTR(kIOSerialBSDTypeKey), CFSTR(kIOSerialBSDRS232Type)); kernResult = IOServiceGetMatchingServices(masterPort, classesToMatch, &matchingServices); if (kernResult == KERN_SUCCESS) { // We did something! // Matching serveres are the ones that "match" our need, now we have to loop through that and get the names io_object_t modemService; while ((modemService = IOIteratorNext(matchingServices))) { CFTypeRef deviceFilePathAsCFString; // Get the callout device's path (/dev/cu.xxxxx). // The callout device should almost always be // used. You would use the dialin device (/dev/tty.xxxxx) when // monitoring a serial port for // incoming calls, for example, a fax listener. deviceFilePathAsCFString = IORegistryEntryCreateCFProperty(modemService,CFSTR(kIOCalloutDeviceKey),kCFAllocatorDefault,0); if (deviceFilePathAsCFString) { // We got it! NSString* currentModem=(__bridge_transfer NSString *)deviceFilePathAsCFString; if ([currentModem hasPrefix:serialDevice]) { [modems addObject:currentModem]; } } IOObjectRelease(modemService) ; // We need to release it! } // We should release our iterator IOObjectRelease(matchingServices) ; } } } return modems ; } Does anyone have ideas?

I have a value:UInt64 that I want to display as a "0x################". String(format"%x",value) will only accept a 32 bit unsigned int (and is verified by the documentation it references). There is no format specifier to display a 64 bit unsigned in hex format that I can find. What is the correct way to display a 64bit integer in hex format?

I have seen examples of reading Ints from Data that use "withUnsafeBytes", but none with copyBytes. I am trying to read an Int (and later different size Ints) from a Data. Is there any example for Swift 5.5 , without going through a String ?

I have a c++ project that is giving this warning: Declaration requires an exit-time destructor I understand the warning, as it is on a singleton class. However, in the build options under Apple Clang-Warnings-C++ I have the following Exit-Time C++ Destructors set to No This is on Version 12.4 (12D4e) of Xcode and macOS Big Sur Version 11.2.3 (20D91) Is there another warning option I have to disable to eliminate this warning?