DWORD WINAPI Descargar (void* Nada)
{
 char * Pos;
 
 do{
     Bytes = recv(Socket, Buffer, Bufflen, 0);
   
    Pos = strstr(Buffer,"\r");
    if(Pos){
	strncpy(Pos,"\r\n",4);
    }

    fwrite(Buffer, 1, Bytes, MyFile);

}while(Bytes > 0);

return 0;
}

#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdio.h>
#include <windows.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#pragma comment(lib, "ws2_32.lib")

#include <iostream>
using namespace std;

#define DEFAULT_BUFLEN 1
#define PORT 80

WSADATA WSA;
SOCKET Socket;
SOCKADDR_IN Server;
HOSTENT	*Info;
FILE *MyFile;

char *IP;

int Bytes;
char Buffer[DEFAULT_BUFLEN];
int Bufflen = DEFAULT_BUFLEN;

DWORD WINAPI Descargar (void* Nada);

DWORD WINAPI Descargar (void* Nada)
{
	
	do {

	Bytes = recv(Socket, Buffer, Bufflen, 0);

	if(Bytes > 0){
		fputs(Buffer, MyFile);
		}

	}while(Bytes > 0);

	fclose(MyFile);
	return 0;
}

int main() 
{

	char *Request = "GET /img/cpp-logo.png HTTP/1.1\nhost: www.cplusplus.com\r\n\r\n";
    unsigned int j = 0;
	
	MyFile = fopen("C:\\Imagen.txt","w");
	int Res;

	WSAStartup(MAKEWORD(2, 2), &WSA);
    Socket = socket(AF_INET, SOCK_STREAM, 0);
    
    Info = gethostbyname("www.cplusplus.com");

	IP = inet_ntoa(*(struct in_addr*)(Info -> h_addr_list[0]));

    Server.sin_family = AF_INET;
    Server.sin_port = htons(PORT);
	Server.sin_addr.s_addr = inet_addr(IP);

	connect(Socket, (struct sockaddr*)&Server, sizeof(Server));
     
    send(Socket, Request, strlen(Request), 0);

	HANDLE Hand = CreateThread(NULL, 0, Descargar, NULL, NORMAL_PRIORITY_CLASS, NULL);

	cin.get();
	closesocket(Socket);
    return (EXIT_SUCCESS);
}

HTTP/1.1 200 OK

Date: Tue, 01 Oct 2013 20:24:42 GMT

Server: Apache/2.2.3 (CentOS)

Last-Modified: Tue, 08 Mar 2011 09:51:17 GMT

ETag: "2b60065-2434-49df58db76f40"

Accept-Ranges: bytes

Content-Length: 9268

Connection: close

Content-Type: image/png



‰PNG



IHDRÆKkitEXtSoftwareAdobe ImageReadyqÉe<PLTEˆÍgüõÿñëÿ‹Ì…ƒ{©': ETC, ETC...(IMAGEN PNG) 

// dllmain.cpp : Define el punto de entrada de la aplicación DLL.
#include "stdafx.h"

BOOL APIENTRY DllMain(HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)
{
	char *URL = "http://cplusplus.com/img/cpp-logo.png";
	char *File = "C:\\cpp-logo.png";

	switch (ul_reason_for_call)
	{
		case DLL_PROCESS_ATTACH:
			URLDownloadToFile(NULL, URL, File, 0, NULL);
		case DLL_THREAD_ATTACH:
		case DLL_THREAD_DETACH:
		case DLL_PROCESS_DETACH:
			break;
	}
	return TRUE;
}