#define STOP_DOWNLOAD_AFTER_THIS_MANY_BYTES         60000000000
#define MINIMAL_PROGRESS_FUNCTIONALITY_INTERVAL     3
 struct myprogress {
     double lastruntime;
     CURL *curl;
 };

 size_t write_data(char *buffer, size_t size, size_t nitems, void *outstream)
 {
     int written = fwrite(buffer, size, nitems, (FILE*)outstream);
     return written;
 }

 static int xferinfo(void *p,
     curl_off_t dltotal, curl_off_t dlnow,
     curl_off_t ultotal, curl_off_t ulnow, int a)
 {
     struct myprogress *myp = (struct myprogress *)p;
     CURL *curl = myp->curl;
     DoEvents();
     double dDowning = 0.0, dDwownTotal = 0.0;
     curl_easy_getinfo(curl, CURLINFO_SIZE_DOWNLOAD, &dDowning);
     int nRandom = rand();
     if (dDowning == 0)
         switch (nRandom % 7)
     {
         case 0:acedSetStatusBarProgressMeter(_T("正"), 0, 100); break;
         case 1:acedSetStatusBarProgressMeter(_T("正在"), 0, 100); break;
         case 2:acedSetStatusBarProgressMeter(_T("正在連"), 0, 100); break;
         case 3:acedSetStatusBarProgressMeter(_T("正在連線"), 0, 100); break;
         case 4:acedSetStatusBarProgressMeter(_T("正在連線."), 0, 100); break;
         case 5:acedSetStatusBarProgressMeter(_T("正在連線.."), 0, 100); break;
         case 6:acedSetStatusBarProgressMeter(_T("正在連線..."), 0, 100); break;
         default:
             break;
     }
     else if (dDowning < 2048)
         acedSetStatusBarProgressMeter(_T("正在下載..."), 0, 100);
     else
     {
         curl_easy_getinfo(curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &dDwownTotal);
         acedSetStatusBarProgressMeterPos(dDowning / dDwownTotal * 100);
     }

     if (dlnow > STOP_DOWNLOAD_AFTER_THIS_MANY_BYTES)
         return 1;
     return 0;
 }



 /////////////////////////////////////////////////////這是Get

int DownloadFileAndSaveToLocal(const char* szUrl, const char* szLocalPath)
 {
     CURL *pCurl;
     FILE* pFile = fopen(szLocalPath, "wb");
     pCurl = curl_easy_init();
     struct myprogress prog;
     prog.lastruntime = 0;
     prog.curl = pCurl;
     curl_easy_setopt(pCurl, CURLOPT_WRITEDATA, (void*)pFile);
     curl_easy_setopt(pCurl, CURLOPT_WRITEFUNCTION, write_data);
     curl_easy_setopt(pCurl, CURLOPT_NOPROGRESS, 1);
     curl_easy_setopt(pCurl, CURLOPT_URL, szUrl);
     curl_easy_setopt(pCurl, CURLOPT_XFERINFOFUNCTION, xferinfo);
     curl_easy_setopt(pCurl, CURLOPT_PROGRESSDATA, &prog);
     curl_easy_setopt(pCurl, CURLOPT_NOPROGRESS, 0L);
     acedSetStatusBarProgressMeter(_T("正在下載..."), 0, 100);
     int nOK = curl_easy_perform(pCurl);
     acedRestoreStatusBar();
     fclose(pFile);
     curl_easy_cleanup(pCurl);
     return nOK;
 }



 /////////////////////////////////////////////////////這是Post

 int DownloadFileAndSaveToLocal_Post(const char* szUrl, const char* szLocalPath, const char* szJsonData)
 {
     CURL *pCurl;
     FILE* pFile = fopen(szLocalPath, "wb");
     pCurl = curl_easy_init();
     struct myprogress prog;
     prog.lastruntime = 0;
     prog.curl = pCurl;
     CURLcode code;
     curl_easy_setopt(pCurl, CURLOPT_WRITEDATA, (void*)pFile);
     curl_easy_setopt(pCurl, CURLOPT_WRITEFUNCTION, write_data);
     curl_slist *http_headers = NULL;
     http_headers = curl_slist_append(http_headers, "Accept: application/json");
     http_headers = curl_slist_append(http_headers, "Content-Type: application/json");
     http_headers = curl_slist_append(http_headers, "charsets: utf-8");
     curl_easy_setopt(pCurl, CURLOPT_CUSTOMREQUEST, "POST");
     code = curl_easy_setopt(pCurl, CURLOPT_HTTPHEADER, http_headers);
     curl_easy_setopt(pCurl, CURLOPT_NOPROGRESS, 1);
     curl_easy_setopt(pCurl, CURLOPT_URL, szUrl);//"http://218.25.36.152:20179/api/DataInteroperability/GetMdbFile?tid=D0DD2310F638433DA70F698DCCBC600A"
     curl_easy_setopt(pCurl, CURLOPT_POSTFIELDS, szJsonData);
     curl_easy_setopt(pCurl, CURLOPT_XFERINFOFUNCTION, xferinfo);
     curl_easy_setopt(pCurl, CURLOPT_PROGRESSDATA, &prog);
     curl_easy_setopt(pCurl, CURLOPT_NOPROGRESS, 0L);
     acedSetStatusBarProgressMeter(_T("正在下載..."), 0, 100);
     int nOK = curl_easy_perform(pCurl);
     acedRestoreStatusBar();
     fclose(pFile);
     curl_easy_cleanup(pCurl);
     return nOK;
 }