Question

我正在开发一个使用NSStream和套接字与Java客户端对话的iOS应用程序。

他们彼此交谈很好，但在iOS方面，我经常会在收到的字符串末尾注销一些奇怪的字符。另一方面，Java客户端似乎正在阅读iOS应用程序发送的所有内容。

垃圾字符的模式长度在5到30个字符之间，它们的图案看起来非常相似。它们总是包含许多颠倒的问号。

我已经包含了我的代码。有谁知道我做错了什么，或者如何消除这些不想要的角色？

- (void)stream:(NSStream *)theStream handleEvent:(NSStreamEvent)streamEvent
{
    switch (streamEvent) {
        case NSStreamEventHasBytesAvailable: {

            uint8_t buffer[100];
            [(NSInputStream *)theStream  read:buffer maxLength:sizeof(buffer)];
            NSString *s = [[NSString alloc] initWithBytes:buffer length:100 encoding:NSASCIIStringEncoding];
            if (s.length>1) {
                CLS_LOG(@"Read: %@",s);
                [self handleRecievedMessage:s];
            }

并在Java服务器上

    DataOutputStream out;
    out = new DataOutputStream(socket.getOutputStream());
    byte[] msg = messageToSend.getBytes();
    out.write(msg);

Answer 1

您应该正确处理实际从流中读取的字符数。试试这个代替你拥有的两条线：

NSInteger len = [(NSInputStream *)theStream  read:buffer maxLength:sizeof(buffer)];
NSString *s = [[NSString alloc] initWithBytes:buffer length:len encoding:NSASCIIStringEncoding];

Answer 2

rmaddy对于我正在从流中读取多少问题是正确的。这是我现在使用的代码，它不再读取任何垃圾字符。

- (void)readFromStream{
int BUFFER_LEN = 512;

uint8_t *buffer;
NSUInteger length;
BOOL freeBuffer = NO;
// The stream has data. Try to get its internal buffer instead of creating one
if(![inputStream getBuffer:&buffer length:&length]) {
    // The stream couldn't provide its internal buffer. We have to make one ourselves
    buffer = malloc(BUFFER_LEN * sizeof(uint8_t));
    freeBuffer = YES;
    NSInteger result = [inputStream read:buffer maxLength:BUFFER_LEN];
    length = result;
}

if (buffer != NULL) {
    NSString *s = [[NSString alloc] initWithBytes:buffer length:length encoding:NSASCIIStringEncoding];
    if (s.length>1) {
        CLS_LOG(@"Read: %@",s);
        [self handleRecievedMessage:s];
    }
}

// length bytes of data in buffer
if(freeBuffer) free(buffer);

}

Java To iOS客户端流读取垃圾字符

2 个答案: