在C++中使用cURL和多线程

Using cURL and multi threading in C++

本文关键字：cURL 多线程 C++      更新时间：2023-10-16

我有一个POST请求，我想在没有任何时间偏移的情况下重复它。我已经在python中用requests完成了它。

import requests
import json
url = 'SOME URL'
headers = {"headers"}
payload ={"some payload here"}
data = json.dumps(payload)
session = requests.Session()
def SendOrder():
r = session.post(url,data=data,headers=headers)
print(r.text)
for i in range(2000):
Thread(target=SendOrder,args=[]).start()

它完美地工作，每个线程在发送post请求后自行结束。我用cURL:在C++中实现

int Requst(CURL *curl) {
curl_easy_perform(curl);
double tt = 0.000;
int curlRC = curl_easy_getinfo(curl, CURLINFO_TOTAL_TIME, &tt);
printf("%.8lfn", tt);
return 0;
}
curl_global_init(CURL_GLOBAL_ALL);
CURL *curl = curl_easy_init();
curl_easy_setopt(curl, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);
curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 1);
curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);
chunk = curl_slist_append(chunk, "user-agent:Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36");
chunk = curl_slist_append(chunk, "x-requested-with:XMLHttpRequest");
curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "POST");
std::string jsonstr = "PAYLOAD";
curl_easy_setopt(curl, CURLOPT_TCP_KEEPALIVE, 1L);
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, chunk);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
curl_easy_setopt(curl, CURLOPT_VERBOSE, 2L);
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, jsonstr.c_str());
curl_easy_setopt(curl, CURLOPT_URL, "url");
for (int i = 1; i <= 1000; i++) {
std::thread(Requst, curl);
}
curl_easy_cleanup(curl);
curl_global_cleanup();

我想在调用Request之后线程结束自己。我不太懂C++。或者无论如何都要制作类似python代码的东西？谢谢

std::thread只是一个围绕本机(实际(线程的包装类。您应该在销毁std::thread实例之前将其保留在身边，并将join()与之一起，否则std::thread的析构函数将中止程序。

您还应该在线程内调用curl_easy_*。

像这样的

std::vector<std::thread> threads;
for (int i = 1; i <= 1000; i++) {
threads.emplace_back([&]{ // creates and starts a thread
CURL *curl = curl_easy_init();
curl_easy_setopt(...
. . .
curl_easy_perform();
curl_easy_cleanup(curl);
});
}
for (auto& t : threads) { // wait for all threads to finish
t.join();
}

话虽如此，为了获得良好的性能，最好使用curl多API。它使用异步套接字而不是线程。

下面是一些如何使用curl多API的示例：multi-poll.c和10-at-time.c

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