我想设置最大下载速度,所以我补充说：@H_403_3@

curl_off_t max_speed = 1000*25;
curl_easy_setopt(curl_handle,CURLOPT_MAX_RECV_SPEED_LARGE,max_speed);

但问题是当它达到极限(25kB / s)或我设置的时候,cpu使用率达到100％@H_403_3@

我用错了方法吗？我想,因为我没有在任何地方找到这个问题.
我试图将这两行添加到原始示例代码中,但它也很疯狂.@H_403_3@

我正在使用Windows和libcurl v 7.29@H_403_3@

谢谢@H_403_3@

可能的解决方案是编写自己的睡眠进度函数,但是……@H_403_3@

这是原始代码“getinmemory.c”,增加了我的2行：@H_403_3@

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
#include <curl/curl.h>
 
struct MemoryStruct {
  char *memory;
  size_t size;
};
 
 
static size_t WriteMemoryCallback(void *contents,size_t size,size_t nmemb,void     *userp)
{
  size_t realsize = size * nmemb;
  struct MemoryStruct *mem = (struct MemoryStruct *)userp;
 
  mem->memory =(char*) realloc(mem->memory,mem->size + realsize + 1);
  if(mem->memory == NULL) {
    /* out of memory! */
    printf("not enough memory (realloc returned NULL)\n");
    return 0;
  }
 
  memcpy(&(mem->memory[mem->size]),contents,realsize);
  mem->size += realsize;
  mem->memory[mem->size] = 0;
 
  return realsize;
}
 
 
int main(void)
{
  CURL *curl_handle;
  CURLcode res;
 
  struct MemoryStruct chunk;
 
  chunk.memory = (char*)malloc(1);  /* will be grown as needed by the realloc     above */
  chunk.size = 0;    /* no data at this point */
 
  curl_global_init(CURL_GLOBAL_ALL);
 
  curl_handle = curl_easy_init();
 
  curl_easy_setopt(curl_handle,CURLOPT_URL,"http://ns223506.ovh.net/rozne/04e4383e647ce87ce42e73fa00bb0058/wallpaper-812988.jpg");   //Random wallpaper
  curl_easy_setopt(curl_handle,CURLOPT_WRITEFUNCTION,WriteMemoryCallback);
  curl_easy_setopt(curl_handle,CURLOPT_WRITEDATA,(void *)&chunk);
  curl_easy_setopt(curl_handle,CURLOPT_USERAGENT,"libcurl-agent/1.0");
 
  //My added 2 lines
  curl_off_t max_speed = 1000*25; // 25kB/s
  curl_easy_setopt(curl_handle,max_speed);
 
 
  res = curl_easy_perform(curl_handle);
 
  if(res != CURLE_OK) {
    fprintf(stderr,"curl_easy_perform() Failed: %s\n",curl_easy_strerror(res));
  }
  else {
    printf("%lu bytes retrieved\n",(long)chunk.size);
  }
 
  curl_easy_cleanup(curl_handle);
 
  if(chunk.memory)
    free(chunk.memory);
 
   curl_global_cleanup();
 
  return 0;
}