[英]Communication between process using NSPipe,NSTask
I need to realize a communication between two threads using NSPipe channels, the problem is that I don't need to call terminal command by specifying this methods. 我需要使用NSPipe通道实现两个线程之间的通信,问题是我不需要通过指定此方法来调用terminal命令。
[task setCurrentDirectoryPath:@"....."];
[task setArguments:];
I just need to write some data 我只需要写一些数据
NSString * message = @"Hello World";
[stdinHandle writeData:[message dataUsingEncoding:NSUTF8StringEncoding]];
and on the other thread to receive this message 并在另一个线程上接收此消息
NSData *stdOutData = [reader availableData];
NSString * message = [NSString stringWithUTF8String:[stdOutData bytes]]; //My Hello World
For example such things in C# can be easy done with NamedPipeClientStream, NamedPipeServerStream classes where pipes are registered by id string. 例如,使用NamedPipeClientStream,NamedPipeServerStream类可以轻松完成C#中的这些操作,其中管道由id字符串注册。
How to achieve it in Objective-C? 如何在Objective-C中实现它?
If I understand your question correctly, you can just create a NSPipe
and use one end for reading and one end for writing. 如果我正确理解了您的问题,您可以创建一个NSPipe
并使用一端进行读取,一端用于写入。 Example: 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];
}
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