Client implementation of client-server chat using Winsock

client.cpp

#include <winsock2.h>
#include <iostream>

char szServerIPAddr[20] = "192.168.1.4";     // Put here the IP address of the server
int nServerPort = 5050;                    // The server port that will be used by                                            // clients to talk with the server

bool InitWinSock2_0();

using namespace std;

int main() {
    cout << "Enter the server IP Address: ";
    cin >> szServerIPAddr;
    cout << "Enter the server port number: ";
    cin >> nServerPort;

    if (!InitWinSock2_0()) {
        cout << "Unable to Initialize Windows Socket environment" << WSAGetLastError() << endl;
        return -1;
    }

    SOCKET hClientSocket;

    hClientSocket = socket(
            AF_INET,        // The address family. AF_INET specifies TCP/IP
            SOCK_STREAM,    // Protocol type. SOCK_STREM specified TCP
            0               // Protoco Name. Should be 0 for AF_INET address family
    );
    if (hClientSocket == INVALID_SOCKET) {
        cout << "Unable to create Server socket" << endl;
        // Cleanup the environment initialized by WSAStartup()
        WSACleanup();
        return -1;
    }


    // Create the structure describing various Server parameters
    struct sockaddr_in serverAddr;

    serverAddr.sin_family = AF_INET;     // The address family. MUST be AF_INET
    serverAddr.sin_addr.s_addr = inet_addr(szServerIPAddr);
    serverAddr.sin_port = htons(nServerPort);

    // Connect to the server
    if (connect(hClientSocket, (struct sockaddr *) &serverAddr, sizeof(serverAddr)) < 0) {
        cout << "Unable to connect to " << szServerIPAddr << " on port " << nServerPort << endl;
        closesocket(hClientSocket);
        WSACleanup();
        return -1;
    }

    char szBuffer[1024] = "";

    while (strcmp(szBuffer, "QUIT") != 0) {
        cout << "Enter the string to send (QUIT) to stop: ";
        cin >> szBuffer;

        int nLength = strlen(szBuffer);

        // send( ) may not be able to send the complete data in one go.
        // So try sending the data in multiple requests
        int nCntSend = 0;
        char *pBuffer = szBuffer;

        while ((nCntSend = send(hClientSocket, pBuffer, nLength, 0) != nLength)) {
            if (nCntSend == -1) {
                cout << "Error sending the data to server" << endl;
                break;
            }
            if (nCntSend == nLength)
                break;

            pBuffer += nCntSend;
            nLength -= nCntSend;
        }

        strupr(szBuffer);
        if (strcmp(szBuffer, "QUIT") == 0) {
            break;
        }

        nLength = recv(hClientSocket, szBuffer, sizeof(szBuffer), 0);
        if (nLength > 0) {
            szBuffer[nLength] = '\0';
            cout << "Received " << szBuffer << " from server" << endl;
        }
    }

    closesocket(hClientSocket);
    WSACleanup();
    return 0;
}

bool InitWinSock2_0() {
    WSADATA wsaData;
    WORD wVersion = MAKEWORD(2, 0);

    if (!WSAStartup(wVersion, &wsaData))
        return true;

    return false;
}