背景：我做了一个基于UDP的IPhone socket应用程序。它在与 Linux [Ubuntu] 服务器通信时作为客户端和服务器工作。我正在使用 GCDAsyncUdpSocket 发送和接收数据。我的 Macbook 上还有一个备份服务器/客户端应用程序来测试/验证套接字通信应用程序。它的作用就像 Linux [Ubuntu] 服务器。它工作完美。
问题：我无法从 Linux [Ubuntu] 服务器接收任何数据。
详细信息：我可以成功地将数据发送到 Linux 服务器，它会对该数据做出反应/处理。但是当服务器发送回复或回显时，我的 iPhone 应用程序看不到/读取它。我与一位同事为 Android 开发的类似应用程序确实从服务器读取/查看数据。请看下面的代码。干杯!
这是它的代码：.m 文件：
-(void)viewDidLoad
{
[super viewDidLoad];
backGround.userInteractionEnabled=YES;
udpSocket = [[GCDAsyncUdpSocket alloc] initWithDelegate:self delegateQueue:dispatch_get_main_queue()];
NSError *error = nil;
if (![udpSocket bindToPort:0 error:&error]) //check ff of dit werkt!
{
return;
}
if (![udpSocket beginReceiving:&error])
{
return;
}
}
- (IBAction)sendData:(id)sender
{
NSString *msg = messageField.text;
NSData *data = [msg dataUsingEncoding:NSUTF8StringEncoding];
[self sendingRealData:data];
}
-(void)sendingRealData:(NSData *) Content
{
NSString *msg = [[NSString alloc] initWithData:Content encoding:NSUTF8StringEncoding];
NSLog(@"msg is: %@", msg);
NSString *host = [self getHost];
int port = [self getPort];
if ((port == 65536) && (host == @"-1"))
{
NSLog(@"Port and IP are not filled in!");
[self errorManag:2];
}
else if ((port == 65536) && (host != @"-1"))
{
NSLog(@"return was -2");
[self errorManag:1];
}
else if (host == @"-1")
{
NSLog(@"return was -1");
[self errorManag:0];
}
else
{
[udpSocket sendData:Content toHost:host port:port withTimeout:1 tag:tag];
NSLog(@"Gestuurd");
}
}
- (void)udpSocket:(GCDAsyncUdpSocket *)sock didReceiveData:(NSData *)data
fromAddress:(NSData *)address
withFilterContext:(id)filterContext
{
NSLog(@"niets.");
NSString *msg = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
if (msg)
{
NSLog(@"iets gekregen");
}
else
{
NSLog(@"Error convertion");
//[self logError:@"Error converting received data into UTF-8 String"];
}
//NSString *test = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
//NSLog(@"%@",test);
//[udpSocket sendData:data toAddress:address withTimeout:-1 tag:0];
NSLog(@"HMMMM");
messageField.text = [[NSString alloc] initWithFormat:@"RE: %@", msg];
}