NSStream 在委托方法handleEvent:eventCode 之外读取\写入

发布于 2024-08-12 18:22:58 字数 657 浏览 6 评论 0原文

在iPhone应用程序中，我通过wifi有一个套接字连接，我需要从inputStream读取并写入outputStream。问题是流管理是事件驱动的，我必须等待事件 NSStreamEventHasBytesAvailable 才能读取。所以我不知道何时在handleEvent:eventCode委托方法之外读取\写入。

我尝试了 while 循环，但我意识到在 while 循环期间应用程序不会接收委托消息并且永远不会停止：

伪代码：

-(void) myFunction {
   canRead=NO;
   [self writeToStream:someData];
   while(!canRead) { };
   readData=[self readFromStream];
}

- (void)stream:(NSStream *)stream handleEvent:(NSStreamEvent)eventCode {

    switch(eventCode) {
          case NSStreamEventHasBytesAvailable: {
        canRead=YES;
        break;
      }
       }
}

我认为我可以在委托方法内读\写，但我需要读\写很多以外的时间。

帮助！谢谢

原文

in an iPhone app, I have a socket connection through wifi, and I need to read from inputStream and write to outputStream. The problem is that stream management is event-driven, and I have to wait for event NSStreamEventHasBytesAvailable before reading. So I can't know when reading\writing outside the handleEvent:eventCode delegate method.

I tried a while loop, but I realized that during the while loop the app doesn't receive delegate messages and never stops:

Pseudo-code:

-(void) myFunction {
   canRead=NO;
   [self writeToStream:someData];
   while(!canRead) { };
   readData=[self readFromStream];
}

- (void)stream:(NSStream *)stream handleEvent:(NSStreamEvent)eventCode {

    switch(eventCode) {
          case NSStreamEventHasBytesAvailable: {
        canRead=YES;
        break;
      }
       }
}

I think I could read\write inside the delegate method, but I need to read\write many times outside that.

Help!
Thankyou

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很酷不放纵 2024-08-19 18:22:58

流类可能在 EventQueue 上放置了一个事件来调用“stream:handleEvent:”。如果您的代码不会将控制权返回给事件处理程序，则无法读取事件队列。您可能想要做的而不是这种方式是：

请参阅 http://developer.apple.com/iphone/library/documentation/cocoa/Reference/Foundation/Classes/NSObject_Class/Reference /Reference.html#//apple_ref/occ/instm/NSObject/performSelectorOnMainThread:withObject:waitUntilDone：

Cocoa 编程的一般概述：http://developer.apple.com/iphone/library/文档/Cocoa/Conceptual/CocoaFundamentals/CoreAppArchitecture/CoreAppArchitecture.html#//apple_ref/doc/uid/TP40002974-CH8-SW45

-(void)myFunction1 {
  [self writeToStream:somedata];
}
-(void)myFunction2 {
  readData=[self readFromStream];
}
- (void)stream:(NSStream *)stream handleEvent:(NSStreamEvent)eventCode {
    switch(eventCode) {
          case NSStreamEventHasBytesAvailable: {
            [self myFunction2];
        break;
      }
       }
}

The stream class probably placed an event on the EventQueue to call "stream:handleEvent:". The event queue can't be read if your code won't return control to the event handler. What you probably want to do instead of that way is:

See http://developer.apple.com/iphone/library/documentation/cocoa/Reference/Foundation/Classes/NSObject_Class/Reference/Reference.html#//apple_ref/occ/instm/NSObject/performSelectorOnMainThread:withObject:waitUntilDone:

And general overview of Cocoa programming: http://developer.apple.com/iphone/library/documentation/Cocoa/Conceptual/CocoaFundamentals/CoreAppArchitecture/CoreAppArchitecture.html#//apple_ref/doc/uid/TP40002974-CH8-SW45

-(void)myFunction1 {
  [self writeToStream:somedata];
}
-(void)myFunction2 {
  readData=[self readFromStream];
}
- (void)stream:(NSStream *)stream handleEvent:(NSStreamEvent)eventCode {
    switch(eventCode) {
          case NSStreamEventHasBytesAvailable: {
            [self myFunction2];
        break;
      }
       }
}

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