curl斷點續傳，下載過程中關閉控制台，然後重新啟動，又會接著下載
#include "stdafx.h"
#include <io.h>
#include "curl/curl.h"
#include <string>/*注意包含這個頭文件後必須把share.h重命名一下，可能是stl裡面也有這個頭文件，比如curl_share.h,然後把包含到的地方替換一下*/
#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;
long localLen = *(long*)ptr;
if ( totalToDownload > 0 )
{
tmp = (int)((nowDownloaded + (double)localLen) / (totalToDownload + (double)localLen) * 100);
}
printf("下載進度%0d%%\r", tmp);
return 0;
}
long GetLocalFileLenth(const char* fileName)
{
char strTemp[256] = {0};
strcpy_s(strTemp,fileName);
FILE* fp = fopen(strTemp, "rb");
if(fp != NULL)
{
long localLen = _filelength(_fileno(fp));
fclose(fp);
return localLen;
}
return 0;
}
/************************************************************************/
/* 獲取要下載的遠程文件的大小 */
/************************************************************************/
long getDownloadFileLenth(const char *url){
long downloadFileLenth = 0;
CURL *handle = curl_easy_init();
curl_easy_setopt(handle, CURLOPT_URL, url);
curl_easy_setopt(handle, CURLOPT_HEADER, 1); //只需要header頭
curl_easy_setopt(handle, CURLOPT_NOBODY, 1); //不需要body
if (curl_easy_perform(handle) == CURLE_OK)
{
curl_easy_getinfo(handle, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &downloadFileLenth);
}
else
{
downloadFileLenth = -1;
}
return downloadFileLenth;
}
bool downLoad(void *_curl, std::string _packageUrl, std::string _storagePath, std::string fileName )
{
// Create a file to save package.
const string outFileName = _storagePath + fileName;
//================斷點續載===================
long localLen = GetLocalFileLenth(outFileName.c_str());
FILE *fp = fopen(outFileName.c_str(), "a+b");
if (! fp)
{
return false;
}
fseek(fp, 0, SEEK_END);
// 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_NOSIGNAL, 1L);
curl_easy_setopt(_curl, CURLOPT_LOW_SPEED_LIMIT, 1L);
curl_easy_setopt(_curl, CURLOPT_LOW_SPEED_TIME, 5L);
curl_easy_setopt(_curl, CURLOPT_HEADER, 0L);
curl_easy_setopt(_curl, CURLOPT_NOBODY, 0L);
curl_easy_setopt(_curl, CURLOPT_FOLLOWLOCATION, 1L);
curl_easy_setopt(_curl, CURLOPT_RESUME_FROM, localLen);
curl_easy_setopt(_curl, CURLOPT_PROGRESSDATA, &localLen);
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");
//downLoad(_curl, "http://localhost/MyWebServer.rar", "./", "MyWebServer.rar");
getchar();
return 0;
}
Ubuntu 用戶安裝下載器 cURL 7.36.0 http://www.linuxidc.com/Linux/2014-05/102269.htm
Linux curl使用簡單介紹 http://www.linuxidc.com/Linux/2008-01/10891.htm
Unix下Curl的使用方法及常用功能記錄分享 http://www.linuxidc.com/Linux/2012-08/69154.htm
curl命令使用 http://www.linuxidc.com/Linux/2014-09/107018.htm
