Hello, im working on a file transfer program but a cant figure out how to make the main function work.

Definition

Sends a file and optional data synchronously to a connected Socket.

Overloads

SendFile(String, Byte[], Byte[], TransmitFileOptions)

Sends the file fileName and buffers of data to a connected Socket object using the specified TransmitFileOptions value.

Parameters

fileName

String

A String that contains the path and name of the file to be sent. This parameter can be null.

preBuffer

Byte[]

A Byte array that contains data to be sent before the file is sent. This parameter can be null.

postBuffer

Byte[]

A Byte array that contains data to be sent after the file is sent. This parameter can be null.

flags

TransmitFileOptions

One or more of TransmitFileOptions values.

Exceptions

The operating system is not Windows NT or later.

-or-

The socket is not connected to a remote host.

The Socket object has been closed.

The Socket object is not in blocking mode and cannot accept this synchronous call.

The file fileName was not found.

An error occurred when attempting to access the socket.

Examples

The following code example creates and connects a socket. The file 'test.txt' is located in the root directory of the local machine. In this example, we create a prebuffer and postbuffer of data and send them to the remote host with the file. The default TransmitFileOptions are used.

Remarks

This overload requires the name of the file you want to send and a bitwise combination of TransmitFileOptions values. The preBuffer parameter contains any data you want to precede the file. postBuffer contains data you want to follow the file. If fileName is in the current working directory, it may be identified with just the name of the file; otherwise, the full path and name of the file must be specified. Wildcards ('.myfile.txt') and UNC share names ('shared directorymyfile.txt') are supported.

The flags parameter provides the Window Sockets service provider with additional information about the file transfer. For more information about how to use this parameter, see TransmitFileOptions.

This method uses the TransmitFile function found in the Windows Sockets 2 API. For more information about the TransmitFile function and its flags, see the Windows Sockets documentation.

SendFile synchronously sends a file to the remote host specified in the Connect or Accept method. SendFile can be used for both connection-oriented and for connectionless protocols.

If you are using a connectionless protocol, you must call Connect before calling this method; otherwise SendFile throws a SocketException. If you are using a connection-oriented protocol, you must either use Connect to establish a remote host connection, or use Accept to accept an incoming connection.

If you are using a connection-oriented protocol, SendFile blocks until the entire file is sent. In nonblocking mode, SendFile may complete successfully before the entire file has been sent. There is no guarantee that the data you send will appear on the network immediately. To increase network efficiency, the underlying system may delay transmission until a significant amount of outgoing data is collected. A successful completion of the SendFile method means that the underlying system has had room to buffer your data for a network send.

Note

If you receive a SocketException, use the SocketException.ErrorCode property to obtain the specific error code. After you have obtained this code, refer to the Windows Sockets version 2 API error code documentation for a detailed description of the error.

Note

This member outputs trace information when you enable network tracing in your application. For more information, see Network Tracing in the .NET Framework.

Sends the file fileName to a connected Socket object with the UseDefaultWorkerThread transmit flag.

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Parameters

fileName

String

A String that contains the path and name of the file to be sent. This parameter can be null.

Exceptions

The socket is not connected to a remote host.

The Socket object has been closed.

The Socket object is not in blocking mode and cannot accept this synchronous call.

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The file fileName was not found.

An error occurred when attempting to access the socket.

Examples

The following code example creates and connects a socket and then sends a file to the remote host. The file 'test.txt' is located in the root directory of the local machine.

Remarks

This overload sends the file fileName to the connected socket. The flags parameter defaults to UseDefaultWorkerThread (0), and the preBuffer and postBuffer parameters default to null. If fileName is in the local directory, it may be identified with just the name of the file; otherwise, the full path and name of the file must be specified. Wildcards ('.myfile.txt') and UNC share names ('shared directorymyfile.txt') are supported. If the file is not found, the exception FileNotFoundException is thrown.

This method uses the TransmitFile function found in the Windows Sockets 2 API. For more information about the TransmitFile function and its flags, see the Windows Sockets documentation.

SendFile synchronously sends a file to the remote host specified in the Connect or Accept method. SendFile can be used for both connection-oriented and for connectionless protocols.

If you are using a connectionless protocol, you must call Connect before calling this method, otherwise SendFile throws a SocketException exception. If you are using a connection-oriented protocol, you must either use Connect to establish a remote host connection or use Accept to accept an incoming connection.

If you are using a connection-oriented protocol, SendFile blocks until the file is sent. In nonblocking mode, SendFile may complete successfully before the entire file has been sent. There is no guarantee that the data you send will appear on the network immediately. To increase network efficiency, the underlying system may delay transmission until a significant amount of outgoing data is collected. A successful completion of the SendFile method means that the underlying system has had room to buffer your data for a network send.

Note

If you receive a SocketException, use the SocketException.ErrorCode property to obtain the specific error code. After you have obtained this code, refer to the Windows Sockets version 2 API error code documentation for a detailed description of the error.

Note

This member outputs trace information when you enable network tracing in your application. For more information, see Network Tracing in the .NET Framework.

Applies to

Story

I've been wanting to play with audio data for a variety of other projects, so I wanted to share this example project as a foundational building block! The example code and hardware will let you very quickly start recording and transmitting audio to a computer, and can easily be extended to playing audio on other devices, recording and using voice commands, and much much more!

The example app samples the microphone every 125 microseconds (or about 8000 times a second, the low-end for audio), and every 100 milliseconds (about 10 times a second) checks to see if someone wants to receive that audio over the internet.

The example client app connects to the listening TCP port on your Photon, and creates a single channel WAV file (since we only have one microphone) file with samples at 8Khz, and that's it! Try playing your audio file in a player like VLC, or something that can play WAV files, here's my recording: https://soundcloud.com/middleca/8khz-audio-recorded-from-a-particle-photon (warning it's quiet, and soundcloud will play a loud song after :) )

I'm looking forward to all the cool stuff you build using this example as a starting point! :)

Special thanks to Particle and Adafruit, for making such awesome easy products!

edit: I've added a 16kHz streaming example that should be smoother (no clicks / pauses), butter audio quality over 8 kHz.

Schematics

Example Layout

David Middlecamp