SysSockRecvFrom¶
This UDP specific function of type DINT calls the function recvfrom of the operating system, in order to read the data which have been sent to the socket.
The function will return the number of read bits. If the socket has been “gracefully closed” , 0 will be returned, otherwise 1.
| Variable | Data type | Description |
|---|---|---|
| diSocket | DINT | Descriptor of the socket, returned by SysSockCreate (corresponding parameter e.g. in Win32: s) |
| pbyBuffer | DWORD | Address of the buffer from which the data should be received (corresponding parameter e.g. in Win32: buf) |
| diBufferSize | DINT | Size of the buffer from which the data should be received (corresponding parameter e.g. in Win32: len) |
| diFlags | DINT | Defines in which way the function should be called; depending on the socket options. (corresponding parameter e.g. in Win32: flags) |
| pSockAddr | DWORD | Pointer to a variable of type SOCKADDR; (see SysSockAccept) |
| diSockAddrSize | DINT | Length of structure SockAddr (can be retrieved via the SIZEOF operator) (corresponding parameter e.g. in Win32: iSockAddrSize) |