iOS中的TCP套接字编程.服务器客户端响应 [英] TCP Socket Programming in iOS. Server Client Response

问题描述

我几乎完成了这项任务，但是由于我得到了部分结果，所以我坚持了一点. 我有服务器(Linux或Windows)和客户端(iOS)，两者之间存在TCP IP套接字连接.我在iphone仿真器中使用过表单加载，在该应用程序打开时，服务器和iphone之间的连接会自动发生.服务器将数据发送回我在模拟器上发送的数据，并在日志中打印出来.但是我无法完全收到整个回复.对于创新"，我可能只是收到"in"或"Innova"等信息.下面是代码段.

I'm almost done with this task but i'm stuck a point due to which i'm getting partial result. I have server(linux or windows) and client(iOS) between which TCP IP socket connection exist. I have used form load in my iphone simulator where the connection between server and iphone happens automatically as the application opens. Server send the data back what ever I send on simulator and print it in log. But i'm not able to exactly receive the whole response. For "Innovations" I receive maybe just "in" or "Innova"etc.. Below are the code snippets.

void TCPClient()
{

    CFStreamCreatePairWithSocketToHost(kCFAllocatorDefault, host, port, &readStream, &writeStream);
    [NSThread sleepForTimeInterval:2]; //Delay


    CFWriteStreamSetProperty(writeStream, kCFStreamPropertyShouldCloseNativeSocket, kCFBooleanTrue);
    if(!CFWriteStreamOpen(writeStream))
    {
        NSLog(@"Error Opening Socket");
    }
    else
    {
        UInt8 buf[] = "Innovations";
        int bytesWritten = CFWriteStreamWrite(writeStream, buf, strlen((char*)buf));
        NSLog(@"Written: %d", bytesWritten);
    }
    CFReadStreamSetProperty(readStream, kCFStreamPropertyShouldCloseNativeSocket, kCFBooleanTrue);
    if(!CFReadStreamOpen(readStream))
    {
        NSLog(@"Error reading");
    }
    else
    {
        UInt8 bufr[15];
        int bytesRead  = CFReadStreamRead(readStream, bufr,strlen((char*)bufr));
        NSLog(@"Read: %d", bytesRead);
        NSLog(@"buffer: %s", bufr);
    }
}

在读取通知中，我确实更改了数组大小.但是我仍然得到错误.对于按钮的IBAction情况相同.即使每次点击，我都在发送数据，而我却没有得到相同数据的响应.

Notice in the read I did change the array size. But I still get the error. Same in the case of IBAction of a button. Even in that for every click i'm sending a data and i'm not getting the response of the same data.

可以提出宝贵的建议吗?

Can valuable suggestion???

推荐答案

一个错误是

int bytesRead  = CFReadStreamRead(readStream, bufr,strlen((char*)bufr));

应该是

int bytesRead  = CFReadStreamRead(readStream, bufr, sizeof(bufr));

CFReadStreamRead的最后一个参数是读取缓冲区的容量，它确定读取的最大字节数. strlen((char*)bufr)是当前在缓冲区中的字符串的 length .您还应该在bufr中的字符串之前用NULL终止该字符串.

The last parameter of CFReadStreamRead is the capacity of the read buffer and determines the maximum number of bytes read. strlen((char*)bufr) is the length of the string currently in the buffer. You should also NULL-terminat the string in bufr before printing it.

进行此修改后，您的程序可能会使用短字符串.但是，一旦您尝试发送/接收大量数据，就会出现问题.

With this modification, your program might work with short strings. But there will be problems as soon as you try to send/receive larger amounts of data.

套接字写操作可以写入的字节数少于您请求的字节数，而套接字读返回的字节数可以少于您的请求字节数.

A socket write can write less bytes than you asked it to, and a socket read can return less bytes than you requested.

看看

Have a look at the Stream Programming Guide which describes how to register the socket streams with the runloop and handle stream events asynchronously.

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