iphone - 如何在 iOS 中将 CFReadStreamRead 设置为超时？

Question

我有在 iOS 上使用 CFReadStreamRead 的遗留代码，但如果没有/丢失连接，CFReadStreamRead 将永远阻塞。如何设置 CFReadStreamRead 超时？

提前致谢

Answer 1

@Michael Wildermuth 是的，打开流时出错并已修复。遇到同样问题的人，下面的代码会有所帮助。

NSURL *url = [NSURL URLWithString:@"http://www.google.com"];
CFStreamClientContext dataStreamContext = {0, (__bridge void *)(self), NULL, NULL, NULL};

CFHTTPMessageRef message = CFHTTPMessageCreateRequest(kCFAllocatorDefault, CFSTR("GET"), (__bridge CFURLRef)url, kCFHTTPVersion1_1);

NSString *header;
NSDictionary *requestHeaders = [NSDictionary dictionaryWithObject:@"application/html;charset=UTF-8" forKey:@"Content-Type"];
for (header in requestHeaders) {
    CFHTTPMessageSetHeaderFieldValue(message, (__bridge CFStringRef)header, (__bridge CFStringRef)[requestHeaders objectForKey:header]);
}

CFHTTPMessageSetBody(message, (CFDataRef)(CFSTR("")));

CFReadStreamRef readStream = CFReadStreamCreateForHTTPRequest(kCFAllocatorDefault, message);
CFOptionFlags events = kCFStreamEventHasBytesAvailable | kCFStreamEventErrorOccurred | kCFStreamEventEndEncountered;


if(CFReadStreamSetClient(readStream, events, EvenCallBack, &dataStreamContext)){
    CFReadStreamScheduleWithRunLoop(readStream, CFRunLoopGetCurrent(), kCFRunLoopCommonModes);
}

CFReadStreamOpen(readStream);

对于回调函数，

void EvenCallBack(CFReadStreamRef readStream, CFStreamEventType type, void *clientCallBackInfo){


if(CFReadStreamHasBytesAvailable(readStream))
{
    uint8_t buf[1024];
    unsigned int len = 1024;

    CFIndex numBytesRead = CFReadStreamRead(readStream, buf, len);

    NSMutableData* data = [[NSMutableData alloc] init];
    [data appendBytes:&buf length:numBytesRead];

    NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

    NSLog(@"Network read (%d): %@", len, str);
}else {
    return;
}

CFHTTPMessageRef message = (CFHTTPMessageRef)CFReadStreamCopyProperty((CFReadStreamRef)readStream, kCFStreamPropertyHTTPResponseHeader);
if (!message) {
    NSLog(@"No message");
}

}

谢谢!