Cocoa 中的分布式对象
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【中文标题】Cocoa 中的分布式对象【英文标题】:Distributed Objects in Cocoa 【发布时间】:2012-07-18 19:00:03 【问题描述】:我试图在我的应用程序中跨两个进程出售一个对象。但是,当我测试我的代码时,接收出售对象的进程只是阻塞。我或多或少遵循了http://www.mikeash.com/pyblog/friday-qa-2009-02-20-the-good-and-bad-of-distributed-objects.html 上的示例代码。
下面是我的两个进程的代码:
/*
* Description: Vends an object that the receiver can then access
* through the distributed object.
*/
#import <Cocoa/Cocoa.h>
#import <iostream>
using namespace std;
int main()
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
cout << "Starting vendor " << endl;
NSMutableArray *mutable_array;
[mutable_array addObject:@"Louis Lang"];
[mutable_array addObject:@"John Doe"];
NSConnection *connection = [NSConnection connectionWithReceivePort:[NSPort port] sendPort:nil];
[connection setRootObject:mutable_array];
[connection registerName:@"com.example.whatever"];
[[NSRunLoop currentRunLoop] run];
[pool drain];
return 0;
还有“接收者”
/*
* Description: Receives the vended object from the server
*
*/
#import <Cocoa/Cocoa.h>
#import <iostream>
using namespace std;
int main()
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
cout << "Starting receiver." << endl;
id theObject = (id)[NSConnection rootProxyForConnectionWithRegisteredName:@"com.example.whatever" host:nil];
int the_count = [theObject count];
NSLog(@"There are %i items in mutable_array", the_count);
[pool drain];
return 0;
【问题讨论】:
【参考方案1】:您的代码大部分看起来都还可以,至少是分布式对象部分。但是:
NSMutableArray* mutable_array = [[NSMutableArray alloc] init];
[mutable_array addObject:@"Louis Lang"];
[mutable_array addObject:@"John Doe"];
我认为肯定会有所帮助。
如果您使用的是 Xcode 4.4+,也可以这样做:
NSArray* array = @[ @"Louis Lang", @"John Doe" ];
【讨论】:
就是这样,我正在出售一个 nil 对象。谢谢!以上是关于Cocoa 中的分布式对象的主要内容,如果未能解决你的问题,请参考以下文章