macos - XPC 在工作区中的两个 cocoa 应用程序之间，NSXPCConnection 立即失效

Question

我有两个 Cocoa 应用程序，一个将成为此 XPC 关系中的发送者，另一个将成为接收者。

在发送方的 applicationDidFinishLaunching 中，我首先打开第二个接收方应用程序

  NSError* error = nil;
  NSURL* url = [[NSBundle mainBundle] bundleURL];
  url = [url URLByAppendingPathComponent:@"Contents" isDirectory:YES];
  url = [url URLByAppendingPathComponent:@"MacOS" isDirectory:YES];
  url = [url URLByAppendingPathComponent:@"TestXPCHelper.app" isDirectory:YES];

  [[NSWorkspace sharedWorkspace] launchApplicationAtURL:url
                                                options:NSWorkspaceLaunchWithoutActivation
                                          configuration:[NSDictionary dictionary]
                                                  error:&error];

  if ( error )
  {
     NSLog(@"launchApplicationAtURL:%@ error = %@", url, error);
     [[NSAlert alertWithError:error] runModal];
  }

然后我创建我的 NSXPCConnection

  assert([NSThread isMainThread]);
  if (self.testConnection == nil) {
     self.testConnection = [[NSXPCConnection alloc] initWithMachServiceName:NEVER_TRANSLATE(@"com.TechSmith.TestXPCHelper") options:NSXPCConnectionPrivileged];
     self.testConnection.remoteObjectInterface = [NSXPCInterface interfaceWithProtocol:@protocol(TestXPCProtocol)];

     self.testConnection.interruptionHandler = ^{
        NSLog(@"Connection Terminated");
     };

     self.testConnection.invalidationHandler = ^{

        self.testConnection.invalidationHandler = nil;
        [[NSOperationQueue mainQueue] addOperationWithBlock:^{
           self.testConnection = nil;
        }];
     };

     [self.testConnection resume];
  }

然后我尝试通过连接发送消息(这里连接已经失效)

  id<TestXPCProtocol> testRemoteObject= [self.testConnection remoteObjectProxy];
  [testRemoteObject testXPCMethod2];

  [[self.testConnection remoteObjectProxyWithErrorHandler:^(NSError * proxyError){
     NSLog(@"%@", proxyError);
  }] testXPCMethod:^(NSString* reply) {
     NSLog(@"%@", reply);
  }];

这是我的接收器应用程序的应用程序委托(delegate):

@interface AppDelegate () <NSXPCListenerDelegate, TestXPCProtocol>

@property (weak) IBOutlet NSWindow *window;

@property NSXPCListener *xpcListener;

@end

@implementation AppDelegate

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
   // Insert code here to initialize your application
   NSLog(@"TESTING123");

   self.xpcListener = [[NSXPCListener alloc] initWithMachServiceName:@"com.TechSmith.TestXPCHelper"];
   self.xpcListener.delegate = self;
   [self.xpcListener resume];
}

- (void)applicationDidBecomeActive:(NSNotification *)notification {
   NSLog(@"ACTIVE234");
}


- (void)applicationWillTerminate:(NSNotification *)aNotification {
   // Insert code here to tear down your application
}

- (void)run
{
   NSLog(@"RUNNING");
   // Tell the XPC listener to start processing requests.

   [self.xpcListener resume];

   // Run the run loop forever.

   [[NSRunLoop currentRunLoop] run];
}

- (BOOL)listener:(NSXPCListener *)listener shouldAcceptNewConnection:(NSXPCConnection *)newConnection
{
   NSLog(@"LISTENING");
   assert(listener == self.xpcListener);
#pragma unused(listener)
   assert(newConnection != nil);

   newConnection.exportedInterface = [NSXPCInterface interfaceWithProtocol:@protocol(TestXPCProtocol)];
   newConnection.exportedObject = self;
   [newConnection resume];

   return YES;
}

- (void)testXPCMethod:(void(^)(NSString * version))reply
{
   NSLog(@"HEY");
   reply(@"REPLY HERE");
}

- (void)testXPCMethod2
{
   NSLog(@"TWO!");
}

这是我尝试通过连接发送消息时的proxyError:

Error Domain=NSCocoaErrorDomain Code=4099 "The connection to service named com.TechSmith.TestXPCHelper was invalidated." UserInfo={NSDebugDescription=The connection to service named com.TechSmith.TestXPCHelper was invalidated.}

所以我认为我的 NSXPCConnection 实例化出了问题。我找不到两个应用程序相互通信的好例子——它总是一个应用程序和一项服务。这就是我的问题吗？我需要在应用程序通信之间提供服务吗？

有什么方法可以获取有关此连接失效原因的更多信息吗？这也会有很大帮助

Answer 1

这里的问题非常简单，结果 initWithMachServiceName 正在显式寻找 mach 服务。我正在使用另一个应用程序进程的标识符。

如果我实际上使用有效的 mach 服务的标识符，则没有问题

请注意，还有两种其他方法可以创建 NSXPCConnection，

使用 NSXPCEndpoint 或使用 XPCService 标识符