回复Cocoa的Apple活动

Question

我正在使用NSAppleEventManager注册Apple事件处理程序:

[[NSAppleEventManager sharedAppleEventManager]
    setEventHandler:self andSelector:@selector(handleGetURLEvent:withReplyEvent:)
      forEventClass:kInternetEventClass andEventID:kAEGetURL];

当然,我的处理程序方法将接收事件和回复事件:

- (void) handleGetURLEvent:(NSAppleEventDescriptor *)event withReplyEvent:(NSAppleEventDescriptor *)replyEvent {
    //Open this URL; reply if we can't
}

所以,如果我需要回复一个错误,表明我以某种方式打开了这个URL,我应该怎么用replyEvent呢？

Answer 1

我已将以下内容从Apple的旧文档"Apple Events Programming Guide"中描述的旧式C过程API转换为Cocoa:

if ([replyEvent descriptorType] != typeNull)
{
    [replyEvent setParamDescriptor:[NSAppleEventDescriptor descriptorWithInt32:someStatusCode] forKeyword:keyErrorNumber];
    [replyEvent setParamDescriptor:[NSAppleEventDescriptor descriptorWithString:someErrorString] forKeyword:keyErrorString];
}

请参阅"Apple Events编程指南"(旧版库中)中的"返回错误信息".