iOS线程通信和进程通信的例子（NSMachPort和NSTask，NSPipe）

转载：http://blog.csdn.net/yxh265/article/details/51483822

iOS线程间的通信

iOS中，两个线程之间要想互相通信，可以使用：NSMachPort 
下面是例子

#define kMsg1 100#define kMsg2 101- (void)viewDidLoad {    [super viewDidLoad];    //1. 创建主线程的port    // 子线程通过此端口发送消息给主线程    NSPort *myPort = [NSMachPort port];    //2. 设置port的代理回调对象    myPort.delegate = self;    //3. 把port加入runloop，接收port消息    [[NSRunLoop currentRunLoop] addPort:myPort forMode:NSDefaultRunLoopMode];    NSLog(@"---myport %@", myPort);    //4. 启动次线程,并传入主线程的port    MyWorkerClass *work = [[MyWorkerClass alloc] init];    [NSThread detachNewThreadSelector:@selector(launchThreadWithPort:)                             toTarget:work                           withObject:myPort];}- (void)handlePortMessage:(NSMessagePort*)message{    NSLog(@"接到子线程传递的消息！%@",message);    //1. 消息id    NSUInteger msgId = [[message valueForKeyPath:@"msgid"] integerValue];    //2. 当前主线程的port    NSPort *localPort = [message valueForKeyPath:@"localPort"];    //3. 接收到消息的port（来自其他线程）    NSPort *remotePort = [message valueForKeyPath:@"remotePort"];    if (msgId == kMsg1)    {        //向子线的port发送消息        [remotePort sendBeforeDate:[NSDate date]                             msgid:kMsg2                        components:nil                              from:localPort                          reserved:0];    } else if (msgId == kMsg2){        NSLog(@"操作2....\n");    }}
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MyWorkerClass

#import "MyWorkerClass.h"@interface MyWorkerClass() <NSMachPortDelegate> {    NSPort *remotePort;    NSPort *myPort;}@end#define kMsg1 100#define kMsg2 101@implementation MyWorkerClass- (void)launchThreadWithPort:(NSPort *)port {    @autoreleasepool {        //1. 保存主线程传入的port        remotePort = port;        //2. 设置子线程名字        [[NSThread currentThread] setName:@"MyWorkerClassThread"];        //3. 开启runloop        [[NSRunLoop currentRunLoop] run];        //4. 创建自己port        myPort = [NSPort port];        //5.        myPort.delegate = self;        //6. 将自己的port添加到runloop        //作用1、防止runloop执行完毕之后推出        //作用2、接收主线程发送过来的port消息        [[NSRunLoop currentRunLoop] addPort:myPort forMode:NSDefaultRunLoopMode];        //7. 完成向主线程port发送消息        [self sendPortMessage];    }}/** *   完成向主线程发送port消息 */- (void)sendPortMessage {    NSMutableArray *array  =[[NSMutableArray alloc]initWithArray:@[@"1",@"2"]];    //发送消息到主线程，操作1    [remotePort sendBeforeDate:[NSDate date]                         msgid:kMsg1                    components:array                          from:myPort                      reserved:0];    //发送消息到主线程，操作2    //    [remotePort sendBeforeDate:[NSDate date]    //                         msgid:kMsg2    //                    components:nil    //                          from:myPort    //                      reserved:0];}#pragma mark - NSPortDelegate/** *  接收到主线程port消息 */- (void)handlePortMessage:(NSPortMessage *)message{    NSLog(@"接收到父线程的消息...\n");    //    unsigned int msgid = [message msgid];    //    NSPort* distantPort = nil;    //    //    if (msgid == kCheckinMessage)    //    {    //        distantPort = [message sendPort];    //    //    }    //    else if(msgid == kExitMessage)    //    {    //        CFRunLoopStop((__bridge CFRunLoopRef)[NSRunLoop currentRunLoop]);    //    }}@end
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以上就可以完成一个线程间的数据通信。

iOS进程间的通信（越狱时用到）

先创建一个命令行工程，建一个简单的子项目。名为：taskchild

#import <UIKit/UIKit.h>#import <Foundation/Foundation.h>#include <stdio.h>int main (int argc, const char * argv[]){    NSLog(@"receive value arg %d %s %s", argc, argv[0], argv[1]);    sleep(10);    // insert code here...    printf("Hello, World!\n");    NSLog(@"Hello, World");    return 0;}
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再创建一个有界面的主项目。进程通信部分代码。需要引用头文件：NSTask.h见下面的引用

    NSString* string = [[NSBundle mainBundle] pathForResource:@"taskchild" ofType:nil];//taskchild是所要启动的名字二进制文件名,上面建的子项目。    NSLog(@"%@",string);    NSTask *task;    task = [[NSTask alloc ]init];    [task setLaunchPath:string];    NSLog(@"This is NSTask with ping command......\n");    NSArray *arguments;    arguments = [NSArray arrayWithObjects:@"22", nil];    [task setArguments:arguments];    NSPipe *pipe;    pipe = [NSPipe pipe];    [task setStandardOutput:pipe];    NSFileHandle *file;    file = [pipe fileHandleForReading];    [task launch];    NSData *data;    data = [file readDataToEndOfFile];    string = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];    NSLog(@"get child value :%@",string);
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引用

RunLoops 
NSTask-4-iOS