Prosoft-technology MVI69-ADMNET Manual do Utilizador descarregar pdf (Página 74)

Application Development Function Library - ADMNET API MVI-ADMNET ♦ 'C' Programmable

Developer's Guide 'C' Programmable Application Development Module with Ethernet

Page 74 of 122 ProSoft Technology, Inc.

February 20, 2013

ADM_receive_buffered_UDP_sk

Syntax

int ADM_receive_buffered_UDP_sk(char *skName, char *holdRecPtr, int

*readLen, char *fromIP, int nBlock);

Parameters

skName

Name of the socket that has been initialized and used to receive messages

holdRecPtr

Pointer to a buffer to hold data that will be received by the API

readLen

Length of data received by the API

fromIP

Character array to hold client IP address

nBlock

Function will block on receive if nBlock > 0. If nBlock is 0, the function will

return

Description

This function is used to receive messages when ADM_init_UDP_buffer is used.

Received messages will be placed in the buffer pointed to by holdRecPtr. The

parameter readLen will be updated with the length of the received message. The

client’s IP address will be placed in fromIP.

Return Value

SK_SUCCESS

Message received if nBlock is non-zero. If nBlock is 0 then this

denotes a successful receive check which will result in a received

message if a message was available..

SK_NOT_FOUND

Socket could not be found.

SK_SOCKET_CLOSE

Socket is closed

Example

char sockName1[] = "ReceiveSocket";

char data[1024];

int length;

char fromIP[64];

unsigned long recvVal[10];

length = MAX_MESSAGE;

err = ADM_receive_buffered_UDP_sk(sockName1, data, &length, fromIP, 1);

if(length > 0)

{

recvVal[index++] = *(unsigned long *)data;

}

if(err < 0)

{

printf("got error\n");

}

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