curl最简单的下载功能的使用

下面是curl最简单的下载示例，其实再强大的功能库，helloworld程序也是很重要，让使用的人一眼就看出好用不好用~

这里包含了#include<string>会导致编译错误，需要把share.h重命名一下，再编译

#include "stdafx.h"
#include "curl/curl.h"
#include <string>

#include "curl/easy.h"

using namespace std;

static size_t downLoadPackage(void *ptr, size_t size, size_t nmemb, void *userdata)
{
 FILE *fp = (FILE*)userdata;
 size_t written = fwrite(ptr, size, nmemb, fp);
 return written;
}

int assetsManagerProgressFunc(void *ptr, double totalToDownload, double nowDownloaded, double totalToUpLoad, double nowUpLoaded)
{
 static int percent = 0;
 int tmp = 0;
 if ( totalToDownload > 0 )
 {
  tmp = (int)(nowDownloaded / totalToDownload * 100);
 }
 
 printf("下载进度%0d%%\r", tmp);
 return 0;
}

bool downLoad(void *_curl, std::string _packageUrl, std::string _storagePath, std::string fileName )
{
 // Create a file to save package.
 const string outFileName = _storagePath + fileName;
 FILE *fp = fopen(outFileName.c_str(), "wb");
 if (! fp)
 {
  return false;
 }

// Download pacakge
 CURLcode res;
 curl_easy_setopt(_curl, CURLOPT_URL, _packageUrl.c_str());
 curl_easy_setopt(_curl, CURLOPT_WRITEFUNCTION, downLoadPackage);
 curl_easy_setopt(_curl, CURLOPT_WRITEDATA, fp);
 curl_easy_setopt(_curl, CURLOPT_NOPROGRESS, false);
 curl_easy_setopt(_curl, CURLOPT_PROGRESSFUNCTION, assetsManagerProgressFunc);
 //curl_easy_setopt(_curl, CURLOPT_PROGRESSDATA, this);
 curl_easy_setopt(_curl, CURLOPT_NOSIGNAL, 1L);
 curl_easy_setopt(_curl, CURLOPT_LOW_SPEED_LIMIT, 1L);
 curl_easy_setopt(_curl, CURLOPT_LOW_SPEED_TIME, 5L);

res = curl_easy_perform(_curl);
 curl_easy_cleanup(_curl);
 if (res != 0)
 {
  fclose(fp);
  return false;
 }

fclose(fp);
 return true;
}

int _tmain(int argc, _TCHAR* argv[])
{
 CURL* _curl = curl_easy_init();
 if (! _curl)
 {
  return 0;
 }

downLoad(_curl, "http://ardownload.adobe.com/pub/adobe/reader/win/11.x/11.0.01/en_US/AdbeRdr11001_en_US.exe", "./", "AdbeRdr11001_en_US.exe");

getchar();
 return 0;
}

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