objective-c - 我可以从 C 函数调用 Objective-C 方法吗？

Question

我是 Objective-C 的新手，所以我尝试做的事情可能无法实现。我正在将一个大型 C 函数重构为多个 C 函数和 Obj-C 方法。

这可能吗？

下面不会生成和报错

'self' undeclared.

  void serverCB(CFReadStreamRef stream, CFStreamEventType event, void *myPtr)
{
    switch(event) {
        case kCFStreamEventHasBytesAvailable:
            [self readStreamData:stream];
            break;
        case kCFStreamEventErrorOccurred:
            NSLog(@"A Read Stream Error Has Occurred!");
            break;
        case kCFStreamEventEndEncountered:
            NSLog(@"A Read Stream Event End!");
            break;
        default:
            break;
    }
}

-(void) readStreamData: (CFReadStreamRef)stream
{   
        NSData *data = [[NSMutableData alloc] init]; //TODO: I have to flush this at some point..?
        uint8_t buffer[1024];
        unsigned int len = 0;       
        len =  [(NSInputStream *)stream read:buffer maxLength:1024];        
        if(len > 0)
        {
            [data appendBytes:&buffer length:len];
        }
        NSString *serverText = [[NSString alloc]    initWithData: data encoding:NSASCIIStringEncoding];
           [data release]; // I got my string so I think I can delete this
           [self processServerMessages:serverText];

    }
}

在列出的第一个函数“serverCB”中，我试图将“readStreamData”消息发送到当前对象。那我只能从c函数调用c函数吗？

谢谢!

Answer 1

您可以从 C 函数调用 Objective-C 方法。但是正如错误告诉您的那样，变量 self 没有定义。您需要将 self 作为参数传递给 serverCB，例如

void serverCB(CFReadStreamRef stream, CFStreamEventType event, void* myPtr, id self) {
   ...
   [self readStreamData:stream];
   ...
}

...

serverCB(stream, event, NULL, self);