#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);//"http://218.25.36.152:20179/api/DataInteroperability/GetMdbFile?tid=D0DD2310F638433DA70F698DCCBC600A"      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;  }