For many years, I programmed for Windows desktops (Visual Basic and C# on Microsoft Visual Studio). What is a good way to start progrmming for an iOS or iPadOS device. What programming apps can you recommend and what books or courses can I get (online or otherwise) to start with? Can I make code with Microsoft Visual Studio or do I need specific programming tools for writing code? Thank you for your help. Michel

Compiler: XCode12/13/14 Tested On: iPhoneXS+iOS15.4 / iPhone11+iOS16.5 I tried to compile following code with arch=arm64e and run, it crashed with EXC_BAD_ACCESS at 'LDRAA', seems occur when trying to access c++ v-table. And this bug will not occur in following conditions. c++ I/O api is easy to trigger the bug. compile with arch=arm64 and run on arm64e device compile with arch=arm64e and run on arm64e device with iOS<=14 #include <fstream> #include <stringstream> int main(int argc, char** argv) { std::ifstream MyReadFile("/System/Library/CoreServices/SystemVersion.plist"); // crash1 std::stringstream stream; stream << std::hex << 0; // crash2 } I also tried c++11/14/17/20, it makes no difference.

Instruments reveals that the following simple code leaks memory on each delegate invoke: - (void)start { [_urlSession dataTaskWithURL:_url]; } - (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data { [_data appendData:data]; } I don't have any clue on this leak, it should not happen. What should I do to avoid this?

Domain: com.apple.dt.CoreDeviceError Code: 3002 User Info: { DVTErrorCreationDateKey = "2024-04-12 13:00:55 +0000"; IDERunOperationFailingWorker = IDEInstallCoreDeviceWorker; NSURL = "file:///Users/Username/Library/Developer/Xcode/DerivedData/project-dwlcjztonmnjygafwwnxdjtbzkwe/Build/Products/Debug-iphoneos/target.app/"; } -- Failed to install the app on the device. Domain: com.apple.dt.CoreDeviceError Code: 3002 User Info: { IDERunOperationFailingWorker = IDEInstallCoreDeviceWorker; NSURL = "file:///Users/Username/Library/Developer/Xcode/DerivedData/project-dwlcjztonmnjygafwwnxdjtbzkwe/Build/Products/Debug-iphoneos/target.app/"; } -- The item at target.app is not a valid bundle. Domain: com.apple.dt.CoreDeviceError Code: 3000 Failure Reason: The path to the provided bundle's main executable could not be determined. Recovery Suggestion: Ensure that your bundle's Info.plist contains a value for the key CFBundleExecutable. User Info: { NSURL = "file:///Users/Username/Library/Developer/Xcode/DerivedData/project-dwlcjztonmnjygafwwnxdjtbzkwe/Build/Products/Debug-iphoneos/target.app/"; ProvidedBundle = "file:///Users/Username/Library/Developer/Xcode/DerivedData/project-dwlcjztonmnjygafwwnxdjtbzkwe/Build/Products/Debug-iphoneos/target.app/"; } -- Event Metadata: com.apple.dt.IDERunOperationWorkerFinished : { "device_isCoreDevice" = 1; "device_model" = "iPhone12,1"; "device_osBuild" = "17.4.1 (21E236)"; "device_platform" = "com.apple.platform.iphoneos"; "dvt_coredevice_version" = "355.24"; "dvt_mobiledevice_version" = "1643.100.58"; "launchSession_schemeCommand" = Run; "launchSession_state" = 1; "launchSession_targetArch" = arm64; "operation_duration_ms" = 2486; "operation_errorCode" = 3000; "operation_errorDomain" = "com.apple.dt.CoreDeviceError.3002.com.apple.dt.CoreDeviceError"; "operation_errorWorker" = IDEInstallCoreDeviceWorker; "operation_name" = IDERunOperationWorkerGroup; "param_debugger_attachToExtensions" = 0; "param_debugger_attachToXPC" = 1; "param_debugger_type" = 3; "param_destination_isProxy" = 0; "param_destination_platform" = "com.apple.platform.iphoneos"; "param_diag_MainThreadChecker_stopOnIssue" = 0; "param_diag_MallocStackLogging_enableDuringAttach" = 0; "param_diag_MallocStackLogging_enableForXPC" = 1; "param_diag_allowLocationSimulation" = 1; "param_diag_checker_tpc_enable" = 1; "param_diag_gpu_frameCapture_enable" = 0; "param_diag_gpu_shaderValidation_enable" = 0; "param_diag_gpu_validation_enable" = 0; "param_diag_memoryGraphOnResourceException" = 0; "param_diag_queueDebugging_enable" = 1; "param_diag_runtimeProfile_generate" = 0; "param_diag_sanitizer_asan_enable" = 0; "param_diag_sanitizer_tsan_enable" = 0; "param_diag_sanitizer_tsan_stopOnIssue" = 0; "param_diag_sanitizer_ubsan_stopOnIssue" = 0; "param_diag_showNonLocalizedStrings" = 0; "param_diag_viewDebugging_enabled" = 1; "param_diag_viewDebugging_insertDylibOnLaunch" = 1; "param_install_style" = 0; "param_launcher_UID" = 2; "param_launcher_allowDeviceSensorReplayData" = 0; "param_launcher_kind" = 0; "param_launcher_style" = 99; "param_launcher_substyle" = 8192; "param_runnable_appExtensionHostRunMode" = 0; "param_runnable_productType" = "com.apple.product-type.application"; "param_structuredConsoleMode" = 1; "par[tag:am_testing_launchedForTesting" = 0; "param_testing_suppressSimulatorApp" = 0; "param_testing_usingCLI" = 0; "sdk_canonicalName" = "iphoneos17.4"; "sdk_osVersion" = "17.4"; "sdk_variant" = iphoneos; } System Information macOS Version 14.4.1 (Build 23E224) Xcode 15.3 (22618) (Build 15E204a) Timestamp: 2024-04-12T18:30:55+05:30 The project is running on the simulator properly with no errors. But while running on the real device (the iPhone), the build is successful but getting the mentioned issue. Also, while creating the.ipa file, we are getting the error mentioned below. I have tried following thing to resolve the issue but nothing is worked. Clean project and try to run the app on the real device. Disconnect iPhone from Mac On iPhone: Settings &gt; Developer &gt; Clear Trusted Computers Uninstall the application Reconnect iPhone to Mac In Xcode Window &gt; Devices &amp; Simulators You should see your device in the left sidebar Re-pair the device In the project Target -&gt; Build Settings search for: search for Excluded Architectures add arm64 there. Change the archive destination directory to a location on the local SSD (and not an external HDD). Go to settings &gt;&gt; Select Privacy &amp; Security &gt;&gt; Turn developer mode off if on &gt;&gt; Turn developer mode back on an follow instrctions &gt;&gt; The run your app on xcode ` Please help me find the solution. Thank you in advance.

Hello, I have received 3 almost identical crash reports from the App Store. They all come from the same user, and they are spaced just ± 45 seconds apart. This is the backtrace of the crashed thread: Crashed Thread: 3 Exception Type: EXC_CRASH (SIGABRT) Exception Codes: 0x0000000000000000, 0x0000000000000000 Termination Reason: Namespace SIGNAL, Code 6 Abort trap: 6 Terminating Process: Ssssssss [46033] Thread 3 Crashed: 0 libsystem_kernel.dylib 0x00007ff81b90f196 __pthread_kill + 10 1 libsystem_pthread.dylib 0x00007ff81b946ee6 pthread_kill + 263 (pthread.c:1670) 2 libsystem_c.dylib 0x00007ff81b86dbdf __abort + 139 (abort.c:155) 3 libsystem_c.dylib 0x00007ff81b86db54 abort + 138 (abort.c:126) 4 libc++abi.dylib 0x00007ff81b901282 abort_message + 241 5 libc++abi.dylib 0x00007ff81b8f33fb demangling_terminate_handler() + 267 6 libobjc.A.dylib 0x00007ff81b5c67ca _objc_terminate() + 96 (objc-exception.mm:498) 7 libc++abi.dylib 0x00007ff81b9006db std::__terminate(void (*)()) + 6 8 libc++abi.dylib 0x00007ff81b900696 std::terminate() + 54 9 libdispatch.dylib 0x00007ff81b7a6047 _dispatch_client_callout + 28 (object.m:563) 10 libdispatch.dylib 0x00007ff81b7a87c4 _dispatch_queue_override_invoke + 800 (queue.c:4882) 11 libdispatch.dylib 0x00007ff81b7b5fa2 _dispatch_root_queue_drain + 343 (queue.c:7051) 12 libdispatch.dylib 0x00007ff81b7b6768 _dispatch_worker_thread2 + 170 (queue.c:7119) 13 libsystem_pthread.dylib 0x00007ff81b943c0f _pthread_wqthread + 257 (pthread.c:2631) 14 libsystem_pthread.dylib 0x00007ff81b942bbf start_wqthread + 15 (:-1) In the backtrace of the main thread, I can see that the error is caught by the app delegate which tries to display an alert, but obviously the message has no time to appear. Incidentally (but it's not my main question), I would like to know if it would be possible in such a case to block the background thread for the time the alert is displayed (e.g. using a dispatch queue)? ... (many other related lines) 72 SSUuuuIIIIIIIIIUUuuuu 0x000000010e8089f2 +[NSAlert(Ssssssss) fatalError:] + 32 73 Ssssssss 0x000000010dd5e75b __universalExceptionHandler_block_invoke (in Ssssssss) (SQAppDelegate.m:421) + 333659 74 libdispatch.dylib 0x00007ff81b7a4d91 _dispatch_call_block_and_release + 12 (init.c:1518) 75 libdispatch.dylib 0x00007ff81b7a6033 _dispatch_client_callout + 8 (object.m:560) 76 libdispatch.dylib 0x00007ff81b7b2fcf _dispatch_main_queue_drain + 954 (queue.c:7794) 77 libdispatch.dylib 0x00007ff81b7b2c07 _dispatch_main_queue_callback_4CF + 31 (queue.c:7954) 78 CoreFoundation 0x00007ff81ba62195 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9 (CFRunLoop.c:1780) 79 CoreFoundation 0x00007ff81ba21ebf __CFRunLoopRun + 2452 (CFRunLoop.c:3147) 80 CoreFoundation 0x00007ff81ba20ec1 CFRunLoopRunSpecific + 560 (CFRunLoop.c:3418) 81 HIToolbox 0x00007ff8254a5f3d RunCurrentEventLoopInMode + 292 (EventLoop.c:455) 82 HIToolbox 0x00007ff8254a5d4e ReceiveNextEventCommon + 657 (EventBlocking.c:384) 83 HIToolbox 0x00007ff8254a5aa8 _BlockUntilNextEventMatchingListInModeWithFilter + 64 (EventBlocking.c:171) 84 AppKit 0x00007ff81eabfb18 _DPSNextEvent + 858 (CGDPSReplacement.m:818) 85 AppKit 0x00007ff81eabe9c2 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 1214 (appEventRouting.m:407) 86 AppKit 0x00007ff81eab1037 -[NSApplication run] + 586 (NSApplication.m:3432) 87 AppKit 0x00007ff81ea85251 NSApplicationMain + 817 (NSApplication.m:9427) 88 dyld 0x00007ff81b5ec41f start + 1903 (dyldMain.cpp:1165) In all 3 reports, another thread indicates that it is sending or receiving a MIDI data (it's exactly the same backtrace in the 3 reports): Thread 1: 0 libsystem_kernel.dylib 0x00007ff81b908552 mach_msg2_trap + 10 1 libsystem_kernel.dylib 0x00007ff81b9166cd mach_msg2_internal + 78 (mach_msg.c:201) 2 libsystem_kernel.dylib 0x00007ff81b90f584 mach_msg_overwrite + 692 (mach_msg.c:0) 3 libsystem_kernel.dylib 0x00007ff81b90883a mach_msg + 19 (mach_msg.c:323) 4 CoreMIDI 0x00007ff834adfd50 XServerMachPort::ReceiveMessage(int&amp;, void*, int&amp;) + 94 (XMachPort.cpp:62) 5 CoreMIDI 0x00007ff834b118c5 MIDIProcess::MIDIInPortThread::Run() + 105 (MIDIClientLib.cpp:204) 6 CoreMIDI 0x00007ff834af9c44 CADeprecated::XThread::RunHelper(void*) + 10 (XThread.cpp:21) 7 CoreMIDI 0x00007ff834afae9f CADeprecated::CAPThread::Entry(CADeprecated::CAPThread*) + 77 (CAPThread.cpp:324) 8 libsystem_pthread.dylib 0x00007ff81b9471d3 _pthread_start + 125 (pthread.c:893) 9 libsystem_pthread.dylib 0x00007ff81b942bd3 thread_start + 15 (:-1) I wonder if this MIDI activity may be related to the crash, even if it doesn't occur in the crashed thread. I also wonder if the dispatch block starting the backtrace of the thread 3 is the same that leads to the thread 1 (to open the NSAlert), which would mean that it's after the error, or if it's a dispatch block into which the error occurs. Finally, 2024-03-25_13-04-40.6314.crash I wonder if std::terminate() could indicate a problem in C++ codes because I have some part of the application written in C++, and it would be a clue. More generally, is it something in these backtraces that can help me to find what's the problem ? Any help greatly appreciated, thanks! -dp

I have a sandboxed app in /Applications. I'm attempting to shoot a problem with LLDB, so I cd to /Applications/app-name/Contents/MacOS and do lldb programname. However, once I fire it off with "r" it dies instantly with: error: process exited with status -1 (lost connection) Should this work? Should I try signing the lldb executable? Thanks!

Hi, i have a daemon service written in Objective-C and C++. i need to detect user change events and reboot my service. I'm using SCDynamicStoreKeyCreateConsoleUser and get notifications for user switch events but not for fast user switch events. is there a way to reliably subscribe to all kinds of user switch events including VNC connection?

I am new to Objective C and relatively new to iOS development. I have an AVCaptureDevice object at hand and would like to print the maximum supported photo dimensions as provided by activeFormat.supportedMaxPhotoDimensions, using Objective C. I tried the following: for (NSValue *obj in device.activeFormat.supportedMaxPhotoDimensions) { CMVideoDimensions *vd = (__bridge CMVideoDimensions *)obj; NSString *s = [NSString stringWithFormat:@"res=%d:%d", vd->width, vd->height]; //print that string } If I run this code, I get: res=314830880:24994 This is way too high, and there is obviously something I am doing wrong, but I don't know what it could be. According to the information I see on the developer forum, I should get something closer to 4000:3000. I can successfully read device.activeFormat.videoFieldOfView and other fields, so I believe my code is sound overall.

I had a customer feedback about a "zero length data" error which was captured using an exception handler and displayed using NSAlert. My app employs [NSURLSession dataTaskWithURL:] to download XML and image data. But I got no idea what it is about. I assume it's related to NSData, but this error never happened before (for years). Does anyone have any idea about the source of this error?

Hello, I want to dynamically update the values of the LSApplicationQueriesSchemes key in the info.plist file within this project. Is this possible? What is Apple's stance on this matter in terms of security?

In objective-c, I created a category, like @interface NSArray <__covariant ObjectType> (ppEx) @end Look at this ObjectType, I wrote a method like - (NSArray *)pp_map:(id(^)(ObjectType element))block;which act like the map function in Swift. you can call it like NSArray <NSString *>*values = @[@"1", @"2", @"3", @"4"]; NSArray *valueMap = [values pp_map:^id _Nonnull(NSString * _Nonnull element) { return [NSString stringWithFormat:@"Hello %@", element]; }]; Now I need to add a property like mapBlock, I want to realize the same func; @property (nonatomic, copy) NSArray *(^mapBlock)(id(^paramBlock)(ObjectType element)); I did it. But when I call this method in Xcode, it can't complete automatically. values.mapBlock(^id _Nonnull(ObjectType _Nonnull element) { }) It's unable to recognize type NSString, and always show ObjectType which can cause error. I can manually change it to NSString, but it's too complicated. I think it's a problem of Xcode. Can anybody help me?

Im getting a duplicate symbols error when I build my Xcode project and Xcode doesn't specify what or where in my code is there a duplicate: "1 duplicate symbols" "Showing Recent Issues Linker command failed with exit code 1 (use -v to see invocation) " #include <stdio.h> #include <IOKit/IOKitLib.h> typedef struct { uint32_t datasize; uint32_t datatype; uint8_t data[32]; } SMCVal_t; io_connect_t conn; kern_return_t openSMC(void) { kern_return_t result; kern_return_t service; io_iterator_t iterator; service = IOServiceGetMatchingServices(kIOMainPortDefault, IOServiceMatching("AppleSMC"), &iterator); if(service == 0) { printf("error: could not match dictionary"); return 0; } result = IOServiceOpen(service, mach_task_self(), 0, &conn); IOObjectRelease(service); return 0; } kern_return_t closeSMC(void) { return IOServiceClose(conn); } kern_return_t readSMC(char *key, SMCVal_t *val) { kern_return_t result; uint32_t keyCode = *(uint32_t *)key; SMCVal_t inputStruct; SMCVal_t outputStruct; inputStruct.datasize = sizeof(SMCVal_t); inputStruct.datatype = 'I' << 24; //a left shift operation. turning the I into an int by shifting the ASCII value 24 bits to the left inputStruct.data[0] = keyCode; result = IOConnectCallStructMethod(conn, 5, &inputStruct, sizeof(SMCVal_t), &outputStruct, (size_t*)&inputStruct.datasize); if (result == kIOReturnSuccess) { if (val -> datasize > 0) { if (val -> datatype == ('f' << 24 | 'l' << 16 | 't' << 8 )) { //bit shifting to from 32bit operation associated with the ASCII charecters 'f', 'l', and 't' float temp = *(float *)val -> data; return temp; } } } return 0.0; } double getTemperature(char *key) { SMCVal_t val; kern_return_t result; result = readSMC(key, &val); if(result == kIOReturnSuccess) { if (val.datasize > 0) { printf("val.datasize: %u\n", val.datasize); if (val.datatype != 0) { double temperature = (double)val.data[0]; return temperature; } } } return 0.0; } double convertToFahrenheit(double Fahrenheit) { return (Fahrenheit * (9.0 / 5.0)) + 32.0; } int main(void) { kern_return_t result; result = openSMC(); if(result == kIOReturnSuccess) { double temp = getTemperature("TC0P"); double temperatureInFahrenheit = convertToFahrenheit(temp); printf("temp: %.2f\n", temperatureInFahrenheit); result = closeSMC(); } return 0; }

I have an overloaded function, one version with a BOOL parameter and one with a bool parameter. It gives me a redefinition error when compiling for Apple Silicon but not when compiling for Intel.

hi, I am using the openpty function in my code to run an interactive command, for example, "hdiutil convert -format UDRO /tmp/myFileName.sparsebundle -o ./test". The file myFileName.sparsebundle is an encrypted disk with a password. When running this command, it triggers the security server and a password input dialog box pops up. I don't want this dialog box to appear, and I want to provide the password through the fd_master returned by openpty. How can I achieve this?

I created one application using Websocket when TLS version was 1.2 connection establishment working fine but when server team update TLS1.2 to TLS1.3 due to security enhancement in my project i am getting SSL Handshake fails with code 9836. and NSOSStatusErrorDomain with code 9836. here is my info.plist NSAppTransportSecurity NSAllowsArbitraryLoads NSExceptionDomains myserver.com NSIncludesSubdomains NSExceptionMinimumTLSVersion TLSv1.3 So my query here is that even if we specify TLSv1.3 for myserver.com as: NSExceptionMinimumTLSVersion TLSv1.3 we want to restrict only to TLS1.3, even if my request fails, how to achieve this?

I try capture screen on wingon. For start app on winlogon i register LaunchAgent to start on LoginWindow. Application is started, but callback getShareableContentExcludingDesktopWindows newer called, and application just stuck.