Objective-C ++:有没有办法出售C ++对象?

时间:2012-07-19 20:37:57

标签: objective-c macos objective-c++ objective-c-runtime distributed-objects

我正在大量使用Objective-C ++。我知道虽然我可以在Objective-C代码中包含C ++代码,但反之亦然。我想通过分布式对象将我创建的自定义C ++对象提供给Objective-C进程。当我尝试这样做时,我收到以下错误消息:

error: cannot convert ‘custom_class*’ to ‘objc_object*’ in argument passing

有没有办法将自定义C ++对象转发给另一个Objective-C进程?

我的代码:

#import <Cocoa/Cocoa.h>
#import <iostream>
#import <stdio.h>

using namespace std;

class custom_class {
    public:
    custom_class();
    ~custom_class();
    void hello();
};

custom_class::custom_class() { }
custom_class::~custom_class() { }
void custom_class::hello() { cout << "Hello World!" << endl; }

int main() {
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    cout << "Starting vendor " << endl;

    custom_class *test = new custom_class();

    NSConnection *connection = [NSConnection connectionWithReceivePort:[NSPort port] sendPort:nil];
    [connection setRequestTimeout:1];
    [connection setRootObject:test];
    [connection registerName:@"DisObjTest"];

    [[NSRunLoop currentRunLoop] run];

    [pool drain];

    return 0;
}

2 个答案:

答案 0 :(得分:4)

如果不在Objective-C类中包装C ++类,就无法做到这一点。所有使分布式对象成为可能的运行时机制在C ++中都不可用。

答案 1 :(得分:-1)

将其包裹在Objective-C界面中:

class custom_class;
@interface custom_class_wrapper : NSObject
@propery (nonatomic, assign) custom_class* obj;
@end

或者在NSValue内,这需要演员

custom_class a;
id obj = [NSValue valueWithPointer:&a];
custom_class* a_val = static_cast<custom_class*>([obj pointerValue]);