libcurl升级后找不到libcurl.so.3解决之法

long writer(void *data, int size, int nmemb, string &content);
bool  CurlInit(CURL *&curl, const char* url,string &content);
bool  GetURLDataBycurl(const char* URL, string &content);

void main()
{
    char *url ="http://www.111cn.net";
    string content;
    if ( GetURLDataBycurl(url,content))
    {
        printf("%sn",content);

    }
    getchar();
}

bool CurlInit(CURL *&curl, const char* url,string &content)
{
    CURLcode code;
    string error;
    curl = curl_easy_init();
    if (curl == NULL)
    {
        printf( "Failed to create CURL connectionn");
        return false;
    }
    code = curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, error);
    if (code != CURLE_OK)
    {
        printf( "Failed to set error buffer [%d]n", code );
        return false;
    }
    curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
    code = curl_easy_setopt(curl, CURLOPT_URL, url);
    if (code != CURLE_OK)
    {
        printf("Failed to set URL [%s]n", error);
        return false;
    }
    code = curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
    if (code != CURLE_OK)
    {
        printf( "Failed to set redirect option [%s]n", error );
        return false;
    }
    code = curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, writer);
    if (code != CURLE_OK)
    {
        printf( "Failed to set writer [%s]n", error);
        return false;
    }
    code = curl_easy_setopt(curl, CURLOPT_WRITEDATA, &content);
    if (code != CURLE_OK)
    {
        printf( "Failed to set write data [%s]n", error );
        return false;
    }
    return true;
}

long writer(void *data, int size, int nmemb, string &content)
{
    long sizes = size * nmemb;
    string temp(data,sizes);
    content += temp;
    return sizes;
}

bool GetURLDataBycurl(const char* URL,  string &content)
{
    CURL *curl = NULL;
    CURLcode code;
    string error;

    code = curl_global_init(CURL_GLOBAL_DEFAULT);
    if (code != CURLE_OK)
    {
        printf( "Failed to global init default [%d]n", code );
        return false;
    }
   
    if ( !CurlInit(curl,URL,content) )
    {
        printf( "Failed to global init default [%d]n" );
        return PM_FALSE;
    }
    code = curl_easy_perform(curl);
    if (code != CURLE_OK)
    {
        printf( "Failed to get '%s' [%s]n", URL, error);
        return false;
    }
    long retcode = 0;
    code = curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE , &retcode);
    if ( (code == CURLE_OK) && retcode == 200 )
    {
        double length = 0;
        code = curl_easy_getinfo(curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD , &length);
        printf("%d",retcode);
        FILE * file = fopen("1.gif","wb");
        fseek(file,0,SEEK_SET);
        fwrite(content.c_str(),1,length,file);
        fclose(file);

        //struct curl_slist *list;
        //code = curl_easy_getinfo(curl,CURLINFO_COOKIELIST,&list);
        //curl_slist_free_all (list);

        return true;
    }
    else
    {
    //    debug1( "%s n ",getStatusCode(retcode));
        return false;
    }
    curl_easy_cleanup(curl);
    return false;
}