我如何知道我的客户端iOS应用是否已连接到服务器？
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我按下按钮以连接到服务器（TCP），但是我不知道它是否已连接。
这是代码的一部分：
[self connectToServerUsingCFStream:msg portNo:50000];
if(readStream && writeStream)
{
NSString *newText = [[NSString alloc] initWithFormat:@\"Connected!! :)\"];
statusText.text = newText;
[newText release];
pingButton.hidden = NO;
}
else
{
NSString *newText = [[NSString alloc] initWithFormat:@\"Connection unsuccessful :(\"];
statusText.text = newText;
[newText release];
}
没有找到相关结果
已邀请:
2 个回复
凰葱崎济邯
CFStreamCreatePairWithSocketToHost(kCFAllocatorDefault, (CFStringRef) urlStr, portNo, &readStream, &writeStream); if (readStream && writeStream) { CFReadStreamSetProperty(readStream, kCFStreamPropertyShouldCloseNativeSocket, kCFBooleanTrue); CFWriteStreamSetProperty(writeStream, kCFStreamPropertyShouldCloseNativeSocket, kCFBooleanTrue); iStream = (NSInputStream *)readStream; [iStream retain]; [iStream setDelegate:self]; [iStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode]; [iStream open]; oStream = (NSOutputStream *)writeStream; [oStream retain]; [oStream setDelegate:self]; [oStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode]; [oStream open]; }像这样：-(void)stream:(NSStream *)theStream handleEvent:(NSStreamEvent)streamEvent { NSString *io; if (theStream == iStream) io = @\">>\"; else io = @\"<<\"; NSString *event; switch (streamEvent) { case NSStreamEventNone: event = @\"NSStreamEventNone\"; statusText.text = @\"Can not connect to the host!\"; break; case NSStreamEventOpenCompleted: event = @\"NSStreamEventOpenCompleted\"; pingButton.hidden = NO; statusText.text = @\"Connected\"; break; case NSStreamEventHasBytesAvailable: event = @\"NSStreamEventHasBytesAvailable\"; if (theStream == iStream) { //read data uint8_t buffer[1024]; int len; while ([iStream hasBytesAvailable]) { len = [iStream read:buffer maxLength:sizeof(buffer)]; if (len > 0) { NSString *output = [[NSString alloc] initWithBytes:buffer length:len encoding:NSASCIIStringEncoding]; NSData *theData = [[NSData alloc] initWithBytes:buffer length:len]; if (nil != output) { //do something with data } } } } break; case NSStreamEventHasSpaceAvailable: event = @\"NSStreamEventHasSpaceAvailable\"; if (theStream == oStream) { //send data uint8_t buffer[11] = \"I send this\"; int len; len = [oStream write:buffer maxLength:sizeof(buffer)]; if (len > 0) { NSLog(@\"Command send\"); [oStream close]; } } break; case NSStreamEventErrorOccurred: event = @\"NSStreamEventErrorOccurred\"; statusText.text = @\"Can not connect to the host!\"; pingButton.hidden = YES; break; case NSStreamEventEndEncountered: event = @\"NSStreamEventEndEncountered\"; statusText.text = @\"Connection closed by the server.\"; pingButton.hidden = YES; [theStream close]; [theStream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode]; [theStream release]; theStream = nil; break; default: event = @\"** Unknown\"; } NSLog(@\"%@ : %@\", io, event); }暂停，则automatically6ѭ将被自动调用，并且其中的所有代码都将运行。 现在我认为这个问题已经回答。漂截嘘
）。 快速浏览一下《 CFNetwork编程指南：使用读取流》时，告诉我，必须使用打开它，如果它确实打开了流，则此函数将返回一个布尔值。if (!CFReadStreamOpen(myReadStream)) { CFStreamError myErr = CFReadStreamGetError(myReadStream); // An error has occurred. if (myErr.domain == kCFStreamErrorDomainPOSIX) { // Interpret myErr.error as a UNIX errno. } else if (myErr.domain == kCFStreamErrorDomainMacOSStatus) { // Interpret myErr.error as a MacOS error code. OSStatus macError = (OSStatus)myErr.error; // Check other error domains. } }你只可以写