iOS--CFMessagePort实现进程间通信

CFMessagePort属于CoreFoundation框架中的类。因此可以在http://opensource.apple.com/tarballs/CF/CF-855.17.tar.gz中在源码，如果感兴趣可以去看看。

下面说下CFMessagePortRef的具体使用。

首先创建一个工程作为消息的接受者。

#import "ViewController.h"#define LOCAL_MACH_PORT_NAME    "com.message.demo"@interface ViewController ()
{CFMessagePortRef        mMsgPortListenner;
}@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];// Do any additional setup after loading the view, typically from a nib.UIButton *startPortButton = [[UIButton alloc] initWithFrame:CGRectMake(100, 200, 120, 40)];[startPortButton setTitle:@"Start " forState:UIControlStateNormal];startPortButton.backgroundColor = [UIColor grayColor];[startPortButton addTarget:self action:@selector(start) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:startPortButton];UIButton *endPortButton = [[UIButton alloc] initWithFrame:CGRectMake(100, 300, 120, 40)];[endPortButton setTitle:@"End " forState:UIControlStateNormal];endPortButton.backgroundColor = [UIColor grayColor];[endPortButton addTarget:self action:@selector(end) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:endPortButton];}CFDataRef onRecvMsgCallBack(CFMessagePortRef local,SInt32 msgid,CFDataRef cfData,void *info)
{NSLog(@"local = %@",local);NSLog(@"msgid = %d",msgid);NSString *strData = nil;if (cfData){const UInt8  * recvedMsg = CFDataGetBytePtr(cfData);strData = [NSString stringWithCString:(char *)recvedMsg encoding:NSUTF8StringEncoding];/**实现数据解析操作**/NSLog(@"receive message:%@",strData);}//为了测试，生成返回数据NSString *returnString = [NSString stringWithFormat:@"i have receive:%@",strData];const char* cStr = [returnString UTF8String];NSUInteger ulen = [returnString lengthOfBytesUsingEncoding:NSUTF8StringEncoding];CFDataRef sgReturn = CFDataCreate(NULL, (UInt8 *)cStr, ulen);return sgReturn;
}- (void)start
{if (0 != mMsgPortListenner && CFMessagePortIsValid(mMsgPortListenner)) {CFMessagePortInvalidate(mMsgPortListenner);}mMsgPortListenner = CFMessagePortCreateLocal(kCFAllocatorDefault, CFSTR(LOCAL_MACH_PORT_NAME), onRecvMsgCallBack, NULL, NULL);CFRunLoopSourceRef source = CFMessagePortCreateRunLoopSource(kCFAllocatorDefault, mMsgPortListenner, 0);CFRunLoopAddSource(CFRunLoopGetCurrent(), source, kCFRunLoopCommonModes);NSLog(@"start");
}

解释下面接收接收方法参数的意思

CFMessagePortRef 指接受消息对象的相关信息

例如：

local = <CFMessagePort 0x7f8391c0a110 [0x10800c7b0]>{locked = Maybe, valid = Yes, remote = No, name = com.message.demo, source = 0x7f8391d08240, callout = onRecvMsgCallBack (0x107362440), context = <CFMessagePort context 0x0>}

SInt32 msgid 给单条消息的标记

CFDataRef data 是消息发送的内容

void *info 可以携带其他数据对象进行传递，通常为空。

接下来再创建一个工程作为消息的发送者

#import "ViewController.h"@interface ViewController ()
{UITextField *textField;
}
@end
#define MSG_PORT "com.message.demo"@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];// Do any additional setup after loading the view, typically from a nib.textField = [[UITextField alloc] initWithFrame:CGRectMake(50, 100, 100, 30)];textField.backgroundColor = [UIColor grayColor];[self.view addSubview:textField];UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];[btn setTitle:@"Send" forState:UIControlStateNormal];[btn addTarget:self action:@selector(sendMethod) forControlEvents:UIControlEventTouchUpInside];btn.frame = CGRectMake(50, 150, 100, 50);[btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];[self.view addSubview:btn];}
- (void)sendMethod
{[self sendMessageToDameonWith:textField.text msgID:101];}- (NSString *)sendMessageToDameonWith:(id)msgInfo msgID:(SInt32)msgid
{CFMessagePortRef bRemote = CFMessagePortCreateRemote(kCFAllocatorDefault, CFSTR(MSG_PORT));if (nil == bRemote) {NSLog(@"bRemote create failed");return nil;}NSString *msg = [NSString stringWithFormat:@"%@",msgInfo];NSLog(@"send msg is :%@",msg);const char *message = [msg UTF8String];CFDataRef data,recvData = nil;data = CFDataCreate(NULL, (UInt8 *)message, strlen(message));/* 发送消息 */CFMessagePortSendRequest(bRemote, msgid, data, 0, 100, kCFRunLoopDefaultMode, &recvData);if (nil == recvData) {NSLog(@"recvData data is nil.");CFRelease(data);CFMessagePortInvalidate(bRemote);CFRelease(bRemote);return nil;}const UInt8 *recvedMsg = CFDataGetBytePtr(recvData);if (nil == recvedMsg) {NSLog(@"receive data err.");CFRelease(data);CFMessagePortInvalidate(bRemote);CFRelease(bRemote);return nil;}NSString *strMsg = [NSString stringWithCString:(char *)recvedMsg encoding:NSUTF8StringEncoding];NSLog(@"%@",strMsg);CFRelease(data);CFMessagePortInvalidate(bRemote);CFRelease(bRemote);CFRelease(recvData);return nil;
}

代码下载地址：http://download.csdn.net/detail/qqmcy/9450336

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