我試圖找到一種方法來下載文件,讓程序等待下載完成,然後移到下一個任務,在這種情況下將檢查是否文件存在C++完成當前的任務,然後繼續下一個
#include <stdio.h>
#include <curl/curl.h>
#include <curl/easy.h>
#include <string>
#include <iostream>
#include <stdlib.h>
#include <fstream>
size_t write_data(void *ptr, size_t size, size_t nmemb, FILE *stream) {
size_t written = fwrite(ptr, size, nmemb, stream);
return written;
}
using namespace std;
int main(void) {
CURL *curl;
FILE *fp;
CURLcode res;
char *url = "http://199.91.153.180/y1plsynnb11g/e9g9mcd3fi5txov/UHC.jar";
char outfilename[FILENAME_MAX] = "UHC.jar";
curl = curl_easy_init();
if (curl) {
fp = fopen(outfilename,"wb");
curl_easy_setopt(curl, CURLOPT_URL, "http://199.91.153.180/y1plsynnb11g/e9g9mcd3fi5txov/UHC.jar");
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp);
res = curl_easy_perform(curl);
/* always cleanup */
curl_easy_cleanup(curl);
fclose(fp);
}
ofstream launch;
launch.open("UHC.jar");
if (launch.is_open()){
cout<< "File Downloaded";
}
else {
cout << "Download Failed";
}
}
不要使用'char *'指向一個字符串,使用'const char *'。 – chris
此代碼應完全按照您的描述進行。在操作完成之前,'curl_easy_perform'不應該返回。所以有什麼問題? –
問題是,一旦它完成它說文件下載然後文件只是空的 –