Disable “Send to” Option on Windows
When you right-click any object on a Windows system, there is the option Send to which is able to literally send objects to other computers by automatically opening a new mail and attaching the chosen file as attachment, process them with other programs selectable from a list, or just moving the file to a different location (hold the Shift key when right-clicking to enable more options to Send to). The common user however does not use this function really often, in fact, he may also find it annoying since it might cause short freezes on slower computers if one accidently hovers the mouse over it and thus makes it load a list of applications. But as for every other problem on your computer there is also a solution for this one, disabling the Send to command with the registry.
To do that, open your registry by entering regedit in to a Run. prompt and direct it to the HKEY_CLASSES_ROOT\AllFilesystemObjects\shellex\ContextMenuHandlers\Send To key.
Now the default value that is found in that key is
If you ever want to revert your setting the easiest way is to just save this value somewhere safe, since the thing you need to do to disable the Send to command is to double-click the value and remove the string so that it is empty. Leave the registry afterwards and the command should no longer appear on right-clicking.
send function (winsock2.h)
The send function sends data on a connected socket.
Syntax
Parameters
A descriptor identifying a connected socket.
A pointer to a buffer containing the data to be transmitted.
The length, in bytes, of the data in buffer pointed to by the buf parameter.
A set of flags that specify the way in which the call is made. This parameter is constructed by using the bitwise OR operator with any of the following values.
| Value | Meaning |
|---|---|
| MSG_DONTROUTE | Specifies that the data should not be subject to routing. A Windows Sockets service provider can choose to ignore this flag. |
| MSG_OOB | Sends OOB data (stream-style socket such as SOCK_STREAM only. |
Return value
If no error occurs, send returns the total number of bytes sent, which can be less than the number requested to be sent in the len parameter. Otherwise, a value of SOCKET_ERROR is returned, and a specific error code can be retrieved by calling WSAGetLastError.
| Error code | Meaning |
|---|---|
| WSANOTINITIALISED | A successful WSAStartup call must occur before using this function. |
| WSAENETDOWN | The network subsystem has failed. |
| WSAEACCES | The requested address is a broadcast address, but the appropriate flag was not set. Call setsockopt with the SO_BROADCAST socket option to enable use of the broadcast address. |
| WSAEINTR | A blocking Windows Sockets 1.1 call was canceled through WSACancelBlockingCall. |
| WSAEINPROGRESS | A blocking Windows Sockets 1.1 call is in progress, or the service provider is still processing a callback function. |
| WSAEFAULT | The buf parameter is not completely contained in a valid part of the user address space. |
| WSAENETRESET | The connection has been broken due to the keep-alive activity detecting a failure while the operation was in progress. |
| WSAENOBUFS | No buffer space is available. |
| WSAENOTCONN | The socket is not connected. |
| WSAENOTSOCK | The descriptor is not a socket. |
| WSAEOPNOTSUPP | MSG_OOB was specified, but the socket is not stream-style such as type SOCK_STREAM, OOB data is not supported in the communication domain associated with this socket, or the socket is unidirectional and supports only receive operations. |
| WSAESHUTDOWN | The socket has been shut down; it is not possible to send on a socket after shutdown has been invoked with how set to SD_SEND or SD_BOTH. |
| WSAEWOULDBLOCK | The socket is marked as nonblocking and the requested operation would block. |
| WSAEMSGSIZE | The socket is message oriented, and the message is larger than the maximum supported by the underlying transport. |
| WSAEHOSTUNREACH | The remote host cannot be reached from this host at this time. |
| WSAEINVAL | The socket has not been bound with bind, or an unknown flag was specified, or MSG_OOB was specified for a socket with SO_OOBINLINE enabled. |
| WSAECONNABORTED | The virtual circuit was terminated due to a time-out or other failure. The application should close the socket as it is no longer usable. |
| WSAECONNRESET | The virtual circuit was reset by the remote side executing a hard or abortive close. For UDP sockets, the remote host was unable to deliver a previously sent UDP datagram and responded with a «Port Unreachable» ICMP packet. The application should close the socket as it is no longer usable. |
| WSAETIMEDOUT | The connection has been dropped, because of a network failure or because the system on the other end went down without notice. |
Remarks
The send function is used to write outgoing data on a connected socket.
For message-oriented sockets (address family of AF_INET or AF_INET6, type of SOCK_DGRAM, and protocol of IPPROTO_UDP, for example), care must be taken not to exceed the maximum packet size of the underlying provider. The maximum message packet size for a provider can be obtained by calling getsockopt with the optname parameter set to SO_MAX_MSG_SIZE to retrieve the value of socket option. If the data is too long to pass atomically through the underlying protocol, the error WSAEMSGSIZE is returned, and no data is transmitted.
The successful completion of a send function does not indicate that the data was successfully delivered and received to the recipient. This function only indicates the data was successfully sent.
If no buffer space is available within the transport system to hold the data to be transmitted, send will block unless the socket has been placed in nonblocking mode. On nonblocking stream oriented sockets, the number of bytes written can be between 1 and the requested length, depending on buffer availability on both the client and server computers. The select, WSAAsyncSelect or WSAEventSelect functions can be used to determine when it is possible to send more data.
Calling send with a len parameter of zero is permissible and will be treated by implementations as successful. In such cases, send will return zero as a valid value. For message-oriented sockets, a zero-length transport datagram is sent.
The flags parameter can be used to influence the behavior of the function beyond the options specified for the associated socket. The semantics of the send function are determined by any options previously set on the socket specified in the s parameter and the flags parameter passed to the send function.
The order of calls made to send is also the order in which the buffers are transmitted to the transport layer. send should not be called on the same stream-oriented socket concurrently from different threads, because some Winsock providers may split a large send request into multiple transmissions, and this may lead to unintended data interleaving from multiple concurrent send requests on the same stream-oriented socket.
Example Code
Example Code
Notes for IrDA Sockets
- The Af_irda.h header file must be explicitly included.
WindowsВ PhoneВ 8: This function is supported for Windows Phone Store apps on WindowsВ PhoneВ 8 and later.
WindowsВ 8.1 and Windows ServerВ 2012В R2: This function is supported for Windows Store apps on WindowsВ 8.1, Windows ServerВ 2012В R2, and later.
sendto function (winsock.h)
The sendto function sends data to a specific destination.
Syntax
Parameters
A descriptor identifying a (possibly connected) socket.
A pointer to a buffer containing the data to be transmitted.
The length, in bytes, of the data pointed to by the buf parameter.
A set of flags that specify the way in which the call is made.
An optional pointer to a sockaddr structure that contains the address of the target socket.
The size, in bytes, of the address pointed to by the to parameter.
Return value
If no error occurs, sendto returns the total number of bytes sent, which can be less than the number indicated by len. Otherwise, a value of SOCKET_ERROR is returned, and a specific error code can be retrieved by calling WSAGetLastError.
| Error code | Meaning |
|---|---|
| WSANOTINITIALISED | A successful WSAStartup call must occur before using this function. |
| WSAENETDOWN | The network subsystem has failed. |
| WSAEACCES | The requested address is a broadcast address, but the appropriate flag was not set. Call setsockopt with the SO_BROADCAST parameter to allow the use of the broadcast address. |
| WSAEINVAL | An unknown flag was specified, or MSG_OOB was specified for a socket with SO_OOBINLINE enabled. |
| WSAEINTR | A blocking Windows Sockets 1.1 call was canceled through WSACancelBlockingCall. |
| WSAEINPROGRESS | A blocking Windows Sockets 1.1 call is in progress, or the service provider is still processing a callback function. |
| WSAEFAULT | The buf or to parameters are not part of the user address space, or the tolen parameter is too small. |
| WSAENETRESET | The connection has been broken due to keep-alive activity detecting a failure while the operation was in progress. |
| WSAENOBUFS | No buffer space is available. |
| WSAENOTCONN | The socket is not connected (connection-oriented sockets only). |
| WSAENOTSOCK | The descriptor is not a socket. |
| WSAEOPNOTSUPP | MSG_OOB was specified, but the socket is not stream-style such as type SOCK_STREAM, OOB data is not supported in the communication domain associated with this socket, or the socket is unidirectional and supports only receive operations. |
| WSAESHUTDOWN | The socket has been shut down; it is not possible to sendto on a socket after shutdown has been invoked with how set to SD_SEND or SD_BOTH. |
| WSAEWOULDBLOCK | The socket is marked as nonblocking and the requested operation would block. |
| WSAEMSGSIZE | The socket is message oriented, and the message is larger than the maximum supported by the underlying transport. |
| WSAEHOSTUNREACH | The remote host cannot be reached from this host at this time. |
| WSAECONNABORTED | The virtual circuit was terminated due to a time-out or other failure. The application should close the socket as it is no longer usable. |
| WSAECONNRESET | The virtual circuit was reset by the remote side executing a hard or abortive close. For UPD sockets, the remote host was unable to deliver a previously sent UDP datagram and responded with a «Port Unreachable» ICMP packet. The application should close the socket as it is no longer usable. |
| WSAEADDRNOTAVAIL | The remote address is not a valid address, for example, ADDR_ANY. |
| WSAEAFNOSUPPORT | Addresses in the specified family cannot be used with this socket. |
| WSAEDESTADDRREQ | A destination address is required. |
| WSAENETUNREACH | The network cannot be reached from this host at this time. |
| WSAEHOSTUNREACH | A socket operation was attempted to an unreachable host. |
| WSAETIMEDOUT | The connection has been dropped, because of a network failure or because the system on the other end went down without notice. |
Remarks
The sendto function is used to write outgoing data on a socket. For message-oriented sockets, care must be taken not to exceed the maximum packet size of the underlying subnets, which can be obtained by using getsockopt to retrieve the value of socket option SO_MAX_MSG_SIZE. If the data is too long to pass atomically through the underlying protocol, the error WSAEMSGSIZE is returned and no data is transmitted.
The to parameter can be any valid address in the socket’s address family, including a broadcast or any multicast address. To send to a broadcast address, an application must have used setsockopt with SO_BROADCAST enabled. Otherwise, sendto will fail with the error code WSAEACCES. For TCP/IP, an application can send to any multicast address (without becoming a group member).
If the socket is not connected, the
getsockname function can be used to determine the local port number associated with the socket but the IP address returned is set to the wildcard address for the given protocol (for example, INADDR_ANY or «0.0.0.0» for IPv4 and IN6ADDR_ANY_INIT or «::» for IPv6).
The successful completion of a sendto does not indicate that the data was successfully delivered.
The sendto function is normally used on a connectionless socket to send a datagram to a specific peer socket identified by the to parameter. Even if the connectionless socket has been previously connected to a specific address, the to parameter overrides the destination address for that particular datagram only. On a connection-oriented socket, the to and tolen parameters are ignored, making sendto equivalent to send.
Example Code
For Sockets Using IP (Version 4)
If the broadcast should be sent out only on a specific interface, then the address pointed to by the to parameter should contain the subnet broadcast address for the interface and the intended port. For example, an IPv4 network address of 192.168.1.0 with a subnet mask of 255.255.255.0 would use a subnet broadcast address of 192.168.1.255.
It is generally inadvisable for a broadcast datagram to exceed the size at which fragmentation can occur, which implies that the data portion of the datagram (excluding headers) should not exceed 512 bytes.
If no buffer space is available within the transport system to hold the data to be transmitted, sendto will block unless the socket has been placed in a nonblocking mode. On nonblocking, stream oriented sockets, the number of bytes written can be between 1 and the requested length, depending on buffer availability on both the client and server systems. The select, WSAAsyncSelect or WSAEventSelect function can be used to determine when it is possible to send more data.
Calling sendto with a len of zero is permissible and will return zero as a valid value. For message-oriented sockets, a zero-length transport datagram is sent.
The flags parameter can be used to influence the behavior of the function invocation beyond the options specified for the associated socket. The semantics of this function are determined by the socket options and the flags parameter. The latter is constructed by using the bitwise OR operator with any of the following values.
| Value | Meaning |
|---|---|
| MSG_DONTROUTE | Specifies that the data should not be subject to routing. A Windows Sockets service provider can choose to ignore this flag. |
| MSG_OOB | Sends OOB data (stream-style socket such as SOCK_STREAM only). |
В
WindowsВ PhoneВ 8: This function is supported for Windows Phone Store apps on WindowsВ PhoneВ 8 and later.
WindowsВ 8.1 and Windows ServerВ 2012В R2: This function is supported for Windows Store apps on WindowsВ 8.1, Windows ServerВ 2012В R2, and later.
