Question

我遇到Tcp连接请求问题。我有两个应用程序，一个是Asp.net网站，另一个是Asp.net WebApi项目。 Api用于公开Web用于移动应用程序的相同功能。我的问题是，有一种方法通过tcp连接请求pdf文件并返回pdf响应。在测试Web应用程序时，我得到了正确的字节响应，但是在使用Api进行测试时，我没有收到所有字节。造成这种变化的原因是什么？。

“RequestData是一个xml字符串，其中包含用于在另一侧生成pdf的参数”

这是tcp请求的代码的和平。

 public static string Connect(string requestData)
        {
            // Create all required object and variables
            TcpClient tcpConnect = new TcpClient();
            NetworkStream tcpStream = null;
            string responseData = string.Empty;
            int bytesRead = 0;
            int resLength = 0;
            using (tcpConnect)
            {
                try
                {

                    tcpConnect.Connect(hostAddress, hostPort);
                }
                catch (Exception ex)
                {

                    throw ex;
                }

                // Open TCP stream and send data
                using (tcpStream = tcpConnect.GetStream())
                {

                    byte[] reqBuffer =  Encoding.GetEncoding("ISO8859-1").GetBytes(requestData);

                    // Get the Big Endian representation of the length as a byte array.
                    byte[] lenBuffer = new byte[4];
                    lenBuffer[0] = (byte)((reqBuffer.Length & 0xFF000000) >> 24);
                    lenBuffer[1] = (byte)((reqBuffer.Length & 0x00FF0000) >> 16);
                    lenBuffer[2] = (byte)((reqBuffer.Length & 0x0000FF00) >> 8);
                    lenBuffer[3] = (byte)(reqBuffer.Length & 0x000000FF);

                    // Send length of request as Big Endian byte array
                    tcpStream.Write(lenBuffer, 0, lenBuffer.Length);

                    // Send request data as string
                    tcpStream.Write(reqBuffer, 0, reqBuffer.Length);

                    // Read 4 Bytes from the buffer, unless the socket is closed
                    bytesRead = 0;

                        bytesRead = tcpStream.Read(lenBuffer, bytesRead, lenBuffer.Length);



                    // If the number of bytes returned is 0 then throw an exception
                    if (bytesRead != 4)
                    {
                        throw new Exception("Unable to communicate with server or invalid data received");
                    }

                    // Get the length of the response byte array from a Big Endian representation.
                    resLength = (lenBuffer[0] << 24) + (lenBuffer[1] << 16) +
                                         (lenBuffer[2] << 8) + lenBuffer[3];

                    // Keep reading from the socket into the buffer until we have the specified number of bytes.
                    byte[] resBuffer = new byte[resLength];

                    // Read 4 Bytes from the buffer, unless the socket is closed
                    bytesRead = 0;
// Issue is here on this below while loop. the web app will receive more than 30 000 bytesread and APi get 3 000 and this result to an api receiving a blank pdf
                    while (bytesRead < resBuffer.Length)
                    {
                        bytesRead += tcpStream.Read(resBuffer, bytesRead, resBuffer.Length - bytesRead);
                        if (bytesRead == 0)
                        {
                            break;
                        }
                    }

                    // If the number of bytes returned is 0 then throw an exception
                    if (bytesRead != resLength)
                    {
                        throw new Exception("Unable to communicate with server or invalid data received");
                    }

                    // Convert the response to valid string
                    responseData = Encoding.GetEncoding("ISO-8859-1").GetString(resBuffer);

                    // Close the stream
                    tcpStream.Close();
                }

                // Close the connection
                tcpConnect.Close();
            }

            // Dispose of all objects
            tcpConnect = null;
            tcpStream = null;`enter code here`

            // Return result data
            return responseData;
        }

Answer 1

这根本不起作用，因为bytesRead只是第一次为0。因此，我不确定它如何与您的Asp网站一起使用，除非它是不同的代码。

bytesRead += tcpStream.Read(resBuffer, bytesRead, resBuffer.Length - bytesRead);
if (bytesRead == 0)
{
    break;
}

你应该做的是：

int bRead = tcpStream.Read(resBuffer, bytesRead, resBuffer.Length - bytesRead);
    if (bRead == 0)
    {
        break;
    }
bytesRead += bRead;

tcp连接问题不返回相同的字节结果

1 个答案: