Error connecting server and client programs - tcpclient

Question

I wrote those two codes. server and client.
//***Server***
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <WinSock2.h>
#define BUF_SIZE 1024
#define OPSZ 4
void ErrorHandling(char *message);
int calculate(int opnum, int opnds[], char op);
int main(int argc, char *argv)
{
WSADATA wsaData;
SOCKET hServSock, hClntSock;
char opinfo[BUF_SIZE];
int result, opndCnt, i;
int recvCnt, recvLen;
SOCKADDR_IN servAdr, clntAdr;
int clntAdrSize;
if(argc != 2)
{
printf("Usage : %s <port>\n", argv[0]);
exit(1);
}
if(WSAStartup(MAKEWORD(2, 2), &wsaData) != 0)
ErrorHandling("WSAStartup() error!");
hServSock = socket(PF_INET, SOCK_STREAM, 0);
if(hServSock == INVALID_SOCKET)
ErrorHandling("socket() error");
memset(&servAdr, 0, sizeof(servAdr));
servAdr.sin_family = AF_INET;
servAdr.sin_addr.s_addr = htonl(INADDR_ANY);
servAdr.sin_port = htons(atoi((char*)argv[1]));
if(bind(hServSock, (SOCKADDR*)&servAdr, sizeof(servAdr)) == SOCKET_ERROR)
ErrorHandling("bind() error");
if(listen(hServSock, 5) == SOCKET_ERROR)
ErrorHandling("listen() error");
clntAdrSize = sizeof(clntAdr);
for(i=0; i<5; i++)
{
opndCnt = 0;
hClntSock = accept(hServSock, (SOCKADDR*)&clntAdr, &clntAdrSize);
recv(hClntSock, (char*)&opndCnt, 1, 0);
recvLen = 0;
while((opndCnt*OPSZ+1) > recvLen)
{
recvCnt = recv(hClntSock, &opinfo[recvLen], BUF_SIZE-1, 0);
recvLen += recvCnt;
}
result = calculate(opndCnt, (int*)opinfo, opinfo[recvLen-1]);
send(hClntSock, (char*)&result, sizeof(result), 0);
closesocket(hClntSock);
}
closesocket(hServSock);
WSACleanup();
return 0;
}
int calculate(int opnum, int opnds[], char op)
{
int result = opnds[0], i;
switch(op)
{
case '+':
for(i=1; i<opnum; i++) result += opnds[i];
break;
case '-':
for(i=1; i<opnum; i++) result -= opnds[i];
break;
case '*':
for(i=1; i<opnum; i++) result *= opnds[i];
break;
}
return result;
}
void ErrorHandling(char *message)
{
fputs(message, stderr);
fputc('\n', stderr);
exit(1);
}
//***client***
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <WinSock2.h>
#define BUF_SIZE 1024
#define RLT_SIZE 4
#define OPSZ 4
void ErrorHandling(char *message);
int main(int argc, char *argv[])
{
WSADATA wsaData;
SOCKET hSocket;
char opmsg[BUF_SIZE];
int result, opndCnt, i;
SOCKADDR_IN servAdr;
if(argc != 3)
{
printf("Usage : %s <IP> <port>\n", argv[0]);
exit(1);
}
if(WSAStartup(MAKEWORD(2, 2), &wsaData) != 0)
ErrorHandling("WSAStartup() error!");
hSocket = socket(PF_INET, SOCK_STREAM, 0);
if(hSocket == INVALID_SOCKET)
ErrorHandling("socket() error");
memset(&servAdr, 0, sizeof(servAdr));
servAdr.sin_family = AF_INET;
servAdr.sin_addr.s_addr = inet_addr(argv[1]);
servAdr.sin_port = htons(atoi(argv[2]));
if(connect(hSocket, (SOCKADDR*)&servAdr, sizeof(servAdr)) == SOCKET_ERROR)
ErrorHandling("connect() error!");
else
puts("Connected..........");
fputs("Operand count: ", stdout);
scanf("%d", &opndCnt);
opmsg[0] = (char)opndCnt;
for(i=0; i<opndCnt; i++)
{
printf("Operand %d: ", i+1);
scanf("%d", (int*)&opmsg[i*OPSZ+1]);
}
fgetc(stdin);
fputs("Operator: ", stdout);
scanf("%c", &opmsg[opndCnt*OPSZ+1]);
send(hSocket, opmsg, opndCnt*OPSZ+2, 0);
recv(hSocket, (char*)&result, RLT_SIZE, 0);
printf("Operation result: %d \n", result);
closesocket(hSocket);
WSACleanup();
return 0;
}
void ErrorHandling(char *message)
{
fputs(message, stderr);
fputc('\n', stderr);
exit(1);
}
I compiled those two codes (that means 2 projects separately) and that made Debug folder.
I saved those 2 project folders to Desktop.
I started cmd and then wrote
cd Desktop-> cd server -> cd Debug -> server 9190
but the error happens (I first coded server to turn the server on, and then I was planning to make the connection between the server and client.)

Answer 1

int main(int argc, char *argv) should read int main(int argc, char **argv)
char *argv[] would also work.
What does int argc, char *argv[] mean? might be worth a read.
Here is a link to a tutorial that will help you get started with winsock programming.