Windows_UDP_socket_client

#include <stdio.h>
#include <stdlib.h>

#include <winsock2.h>

#define SERVER_ADDR "192.168.111.155"
#define PORT 7
#define BUF_SIZE 1024

void testResult(int result , int checkStatus , const char* msg);
void errorMessage(const char* msg);

int main()
{

    /* UDP test */

    char recvBuf[BUF_SIZE] = {0};


    // Initialize Winsock.
    WSADATA wsaData;
    int iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
    if ( iResult != NO_ERROR )
    {
        errorMessage("Error at WSAStartup()\n");
    }

    struct sockaddr_in serverAddr = {0};;
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_addr.s_addr = inet_addr(SERVER_ADDR);
    serverAddr.sin_port = htons(PORT);


    int clientFD = socket(AF_INET , SOCK_DGRAM , IPPROTO_UDP);
    testResult(clientFD , SOCKET_ERROR , "Creating socket error\n");

    /*
    printf("Connect to server.. \n\r");
    iResult = connect(clientFD , (struct sockaddr *)&serverAddr , sizeof(serverAddr));
    testResult(iResult , SOCKET_ERROR , "Connection error\n");
    */

    printf("Send data to server.. \n\r");
    iResult = sendto(clientFD , "hello" , strlen("hello") , 0 , (struct sockaddr *)&serverAddr , sizeof(serverAddr));
    testResult(iResult , SOCKET_ERROR , "Send data error\n");

    printf("Receive from server.. \n\r");
    iResult = recvfrom(clientFD , recvBuf , sizeof(recvBuf) , 0 , (struct sockaddr *)&serverAddr , sizeof(serverAddr));
    testResult(iResult , SOCKET_ERROR , "Receive error\n");

    closesocket(clientFD);


    return 0;
}

void testResult(int result , int checkStatus , const char* msg)
{
    if(result == checkStatus)
        errorMessage(msg);
}

void errorMessage(const char* msg)
{
    printf("Error code : %d , %s",WSAGetLastError(),msg);
    system("Pause");
    exit(EXIT_FAILURE);
}