please tell me what is going on in below code

if(curl)
{
curl_easy_setopt(curl,CURLOPT_URL,url.c_str());
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
curl_easy_setopt(curl,CURLOPT_WRITEDATA,&ret);
curl_easy_setopt(curl,CURLOPT_WRITEFUNCTION,WriteFunction);
CURLcode res = curl_easy_perform(curl);
if(res != CURLE_OK)
{
curl_easy_cleanup(curl);
return 0;
}
curl_easy_cleanup(curl);
if(ret.find("Ok"))
{
char* r=new char[ret.length()+1];
strcpy(r,ret.c_str());
char* p=strtok(r,"|");
p=strtok(NULL,"|");
return atoi(p);
}
}
return 1;
}

i have a code for sms send my api provider is changed below mention is my code problem is what will return my new api vender so i can use that dll in my vfp application. code

// smsservice.cpp : Defines the exported functions for the DLL application.
//

#include "stdafx.h"
#include "smsservice.h"
#include using namespace std;
size_t WriteFunction( char *ptr, size_t size, size_t nmemb, void *userdata)
{
string* s=(string*)userdata;
int i;
for(i=0;ipush_back(ptr[i]);
}
return i;
}
int _declspec(dllexport) SendSms(LPCSTR userId,LPCSTR userPass,LPCSTR phoneNumber,LPCSTR smsText,LPCSTR senderId)
{
CURL* curl;
curl=curl_easy_init();
string ret;
string url="http://way2send.in/submitsms.jsp?Userid=";

char\* esc=curl\_easy\_escape(curl,userId,strlen(userId));
url+=esc;
curl\_free(esc);

url+="&UserPassword=";
esc=curl\_easy\_escape(curl,userPass,strlen(userPass));
url+=esc;
curl\_free(esc);

url+="&PhoneNumber=";
esc=curl\_easy\_escape(curl,phoneNumber,strlen(phoneNumber));
url+=esc;
curl\_free(esc);

url+="&Text=";
esc=curl\_easy\_escape(curl,smsText,strlen(smsText));
url+=esc;
curl\_free(esc);

url+="&GSM=";
esc=curl\_easy\_escape(curl,senderId,strlen(senderId));
url+=esc;
curl\_free(esc);

if(curl)
{
	curl\_easy\_setopt(curl,CURLOPT\_URL,url.c\_str());
	curl\_easy\_setopt(curl, CURLOPT\_FOLLOWLOCATION, 1L);
	curl\_easy\_setopt(curl,CURLOPT\_WRITEDATA,&ret);
	curl\_easy\_setopt(curl,CURLOPT\_WRITEFUNCTION,WriteFunction);
	CURLcode res = curl\_easy\_perform(curl);
	if(res != CURLE\_OK)
	{	
		curl\_easy\_cleanup(curl);
		return 0;
	}
	curl\_easy\_cleanup(curl);
	if(ret.find("Ok"))
	{
		char\* r=new char\[ret.length()+1\];
		strcpy(r,ret.c\_str());
		char\* p=strtok(r,"|");
		p=strtok(NULL,"|");
		return atoi(p);
	}
}
return 1;

}