File Client via Winsock (S->C)

// FileClient.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "stdio.h"
#include "conio.h"
#include "winsock2.h"
#include "ws2tcpip.h"

SOCKET s;
SOCKADDR_IN sAddr;

DWORD WINAPI ReceiverThread(LPVOID Param) {
    char buf[1024];
    int len;
    while (true) {
        len = recv(s, buf, 1024, 0);
        if (len > 0) {
            buf[len] = 0;
            int size = atoi(buf);
            if (size == 0) {
                printf("%s", buf);
            }
            else {
                FILE *fw = fopen("b.jpg", "wb");

                int checksize = 0;
                char* buffer;
                buffer = (char*)malloc(size + 1);
                while (checksize < size) {
                    int Received = recv(s, buffer, size, 0);
                    int Written = fwrite(buffer, sizeof(char), Received, fw);
                    checksize += Written;
                    for (int i = 0; i < Written; i++) {
                        if (buffer[i] == '\n') {
                            checksize += 1;
                        }
                    }
                }
                fclose(fw);
                free(buffer);
                printf("complete");
            }
        }
    }
    return 0;
}

int main()
{
    WSADATA wsadata;
    int ret = WSAStartup(MAKEWORD(2, 2), &wsadata);

    s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

    sAddr.sin_family = AF_INET;
    sAddr.sin_port = htons(10008);
    sAddr.sin_addr.s_addr = inet_addr("127.0.0.1");

    connect(s, (sockaddr*)&sAddr, sizeof(sAddr));

    char buf[1024];

    CreateThread(0, 0, ReceiverThread, 0, 0, 0);
    while (true) {
        fgets(buf, 1024, stdin);
        send(s, buf, strlen(buf), 0);
    }

    closesocket(s);
    WSACleanup();

    return 0;
}