使用curl經過post請求下載,代碼如下:
#include<iostream>
#include<string>
#include<curl\curl.h>
using namespace std;
//下載文件數據接收函數
size_t dl_req_reply(void *buffer, size_t size, size_t nmemb, void *user_p)
{
FILE *fp = (FILE *)user_p;
size_t return_size = fwrite(buffer, size, nmemb, fp);
//cout << (char *)buffer << endl;
return return_size;
}
//http POST請求文件下載
CURLcode dl_curl_post_req(const string &url, const string &postParams, string filename)
{
//int len = filename.length();
//char* file_name = new char(len + 1);//char*最後有一個結束字符\0
//strcpy_s(file_name, len + 1, filename.c_str());
//FILE *fp = fopen(file_name, "wb");
const char* file_name = filename.c_str();
char* pc = new char[1024];//足夠長
strcpy(pc, file_name);
FILE *fp = fopen(pc, "wb");
// curl初始化
CURL *curl = curl_easy_init();
// curl返回值
CURLcode res;
if (curl)
{
// set params
//設置curl的請求頭
struct curl_slist* header_list = NULL;
header_list = curl_slist_append(header_list, "User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko Core/1.63.6788.400 QQBrowser/10.3.2843.400");
header_list = curl_slist_append(header_list, "Content-Type: application/x-www-form-urlencoded; charset=UTF-8");
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, header_list);
//不接收響應頭數據0代表不接收 1代表接收
curl_easy_setopt(curl, CURLOPT_HEADER, 0);
//設置請求爲post請求
curl_easy_setopt(curl, CURLOPT_POST, 1);
//設置請求的URL地址
curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
//設置post請求的參數
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, postParams.c_str());
//設置ssl驗證
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, false);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, false);
//CURLOPT_VERBOSE的值爲1時,會顯示詳細的調試信息
curl_easy_setopt(curl, CURLOPT_VERBOSE, 0);
curl_easy_setopt(curl, CURLOPT_READFUNCTION, NULL);
//設置數據接收和寫入函數
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &dl_req_reply);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp);
curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);
//設置超時時間
//curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 6);
//curl_easy_setopt(curl, CURLOPT_TIMEOUT, 6);
// 開啓post請求
res = curl_easy_perform(curl);
}
//釋放curl
curl_easy_cleanup(curl);
//釋放文件資源
fclose(fp);
return res;
}
int main()
{
string dl_url = "post請求下載文件地址";
string postParams = "post請求下載參數";
string filename = "文件存儲名稱";
auto res3 = dl_curl_post_req(dl_url, "", filename);
if (res3 == CURLE_OK)
{
cout << "下載成功!" << endl;
}
getchar();
return 0;
}
將代碼中的下載地址,請求參數和文件名替換成自己的,就可以直接下載了。