使用NSPipe進程之間的通信，NSTask

Question

我需要使用NSPipe通道實現兩個線程之間的通信，問題是我不需要通過指定此方法來調用終端命令。

[task setCurrentDirectoryPath:@"....."]; 
[task setArguments:]; 

我只需要編寫一些數據

NSString * message = @"Hello World"; 
[stdinHandle writeData:[message dataUsingEncoding:NSUTF8StringEncoding]]; 

和其他線程收到此消息

 NSData *stdOutData = [reader availableData]; 
NSString * message = [NSString stringWithUTF8String:[stdOutData bytes]]; //My Hello World 

例如在C＃這樣的事情可以用NamedPipeClientStream可以輕鬆完成， NamedPipeServerStream類，其中管道通過id字符串進行註冊。

如何在Objective-C中實現它？

Answer 1

如果我正確理解你的問題，你可以創建一個NSPipe，並使用一端閱讀和一端寫作。例如：

// Thread function is called with reading end as argument: 
- (void) threadFunc:(NSFileHandle *)reader 
{ 
    NSData *data = [reader availableData]; 
    NSString *message = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; 
    NSLog(@"%@", message); 
} 

- (void) test 
{ 
    // Create pipe: 
    NSPipe *pipe = [[NSPipe alloc] init]; 
    NSFileHandle *reader = [pipe fileHandleForReading]; 
    NSFileHandle *writer = [pipe fileHandleForWriting]; 

    // Create and start thread: 
    NSThread *myThread = [[NSThread alloc] initWithTarget:self 
               selector:@selector(threadFunc:) 
                object:reader]; 
    [myThread start]; 

    // Write to the writing end of pipe: 
    NSString * message = @"Hello World"; 
    [writer writeData:[message dataUsingEncoding:NSUTF8StringEncoding]]; 

    // This is just for this test program, to avoid that the program exits 
    // before the other thread has finished. 
    [NSThread sleepForTimeInterval:2.0]; 
}