curl断点续载
摘自http://blog.csdn.net/zmy12007/article/details/37157297
摘自http://www.linuxidc.com/Linux/2014-10/107509.htm
curl断点续传,下载过程中关闭控制台,然后重新启动,又会接着下载
- #include "stdafx.h"
- #include <io.h>
- #include "curl/curl.h"
- #include <string>/*注意包含这个头文件后必须把share.h重命名一下,可能是stl里面也有这个头文件,比如curl_share.h,然后把包含到的地方替换一下*/
- #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("下载进度%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;
- }
- /************************************************************************/
- /* 获取要下载的远程文件的大小 */
- /************************************************************************/
- 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头
- 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;
- //================断点续载===================
- 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;
- }