使用NSPipe，NSTask進程之間的通信

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terminal命令。

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

我只需要寫一些數據

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

並在另一個線程上接收此消息

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

例如，使用NamedPipeClientStream，NamedPipeServerStream類可以輕松完成C＃中的這些操作，其中管道由id字符串注冊。

如何在Objective-C中實現它？

Answer 1

如果我正確理解了您的問題，您可以創建一個NSPipe並使用一端進行讀取，一端用於寫入。 例：

// 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];
}