Question

我正在尝试将数据发送到UDP服务器，我遇到了一些问题。发送后我没有收到数据。然后我尝试了一个网络记录器。我可以看到，当我使用NSUTF8Stringencoding显示在网络日志上时，但当我使用NSASCIIEncoding时，它不会发送。

我真的很想得到一些帮助。我正在使用CocaoAsyncUDPSocket。如果任何人都无法再帮助接收数据，那真的很酷。

这是我的代码：

NSString *ipString = @"192.168.0.116:7777";
NSArray *splitArray = [ipString componentsSeparatedByString:@":"];

NSString *ip = [splitArray objectAtIndex:0];
NSString *port = [splitArray objectAtIndex:1];

NSArray *ipArray = [ip componentsSeparatedByString:@"."];
char ipNumber1 = [self chr:[[ipArray objectAtIndex:0] intValue]];
char ipNumber2 = [self chr:[[ipArray objectAtIndex:1] intValue]];
char ipNumber3 = [self chr:[[ipArray objectAtIndex:2] intValue]];
char ipNumber4 = [self chr:[[ipArray objectAtIndex:3] intValue]];

char portByte1 = [self chr:[port intValue] & 0xFF];
char portByte2 = [self chr:[port intValue] >> 8 & 0xFF];
NSString *packetString = [NSString stringWithFormat:@"SAMP%c%c%c%c%c%cp4150", ipNumber1, ipNumber2, ipNumber3, ipNumber4, portByte1, portByte2];

GCDAsyncUdpSocket *socket = [[GCDAsyncUdpSocket alloc] initWithDelegate:self delegateQueue:dispatch_get_main_queue()];
NSError *err = nil;
NSData *data = [packetString dataUsingEncoding:NSASCIIStringEncoding];
[socket sendData:data toHost:ip port:[port intValue] withTimeout:-1 tag:1];
NSLog(@"%@", packetString);

这个永远不会被称为：

-(void)udpSocket:(GCDAsyncUdpSocket *)sock didReceiveData:(NSData *)data fromAddress:(NSData *)address withFilterContext:(id)filterContext; {

    NSLog(@"Received data");
}

以下是用C＃http://wiki.sa-mp.com/wiki/Query_Mechanism/Csharp

编写的相同功能

Answer 1

NSString用于一系列Unicode字符，不能用作容器你在这里的任意字节序列。

您最好先在字节缓冲区中构建消息，然后将其直接转换为 NSData：

unsigned char buffer[20]; // Choose a size that is large enough for your messages
memcpy(&buffer[0], "SAMP", 4);
buffer[4] = [[ipArray objectAtIndex:0] intValue];
buffer[5] = [[ipArray objectAtIndex:1] intValue];
buffer[6] = [[ipArray objectAtIndex:2] intValue];
buffer[7] = [[ipArray objectAtIndex:3] intValue];
buffer[8] = [port intValue] & 0xFF;
buffer[9] = [port intValue] >> 8 & 0xFF;
memcpy(&buffer[10], "p4150", 5);
int messageSize = 15;
NSData *data = [NSData dataWithBytes:buffer length:messageSize];

通过套接字发送数据时编码问题

1 个答案: