用cURL下載文件的簡單方法

Question

在我的程序中，我想下載幾個文件。所以我把卷曲和使用該代碼（截斷並從這裏Download file using libcurl in C/C++修改一點點）：

#include "curl.h" 
using namespace std; 

size_t write_data(void *ptr, size_t size, size_t nmemb, FILE *stream) { 
    size_t written; 
    written = fwrite(ptr, size, nmemb, stream); 
    return written; 
} 

int DlZip(){ 
    CURL *curl; 
    FILE *fp; 
    CURLcode res; 
    string url = "http://wordpress.org/extend/plugins/about/readme.txt"; 
    char outfilename[FILENAME_MAX] = "/Users/Me/Desktop/bbb.txt"; 
    curl = curl_easy_init(); 
    if (curl) { 
     fp = fopen(outfilename,"wb"); 
     curl_easy_setopt(curl, CURLOPT_URL, url.c_str()); 
     curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data); 
     curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp); 
     res = curl_easy_perform(curl); 
     curl_easy_cleanup(curl); 
     fclose(fp); 
    } 
    return 0; 
} 

但是什麼都沒有發生，有沒有我的桌面上的任何文件： -/

什麼問題與我的代碼？ 或者如果你有一個簡單的功能使用，你能給我嗎？

謝謝！

Answer 1

檢查下面的代碼

#include <cstdio> 
#include <curl/curl.h> 
#include <curl/types.h> 
#include <curl/easy.h> 
#include <string> 



using namespace std; 

size_t write_data(void *ptr, size_t size, size_t nmemb, FILE *stream) { 
    size_t written; 
    written = fwrite(ptr, size, nmemb, stream); 
    return written; 
} 

int main(){ 
    CURL *curl; 
    FILE *fp; 
    CURLcode res; 
    string url = "http://www.joes-hardware.com/tools.html"; 
    char outfilename[FILENAME_MAX] = "./MyText.txt"; 
    curl = curl_easy_init(); 
    if (curl) { 
     fp = fopen(outfilename,"wb"); 
     curl_easy_setopt(curl, CURLOPT_URL, url.c_str()); 
     curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data); 
     curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp); 
     res = curl_easy_perform(curl); 
     curl_easy_cleanup(curl); 
     fclose(fp); 
    } 
    return 0; 
} 

它工作正常。 問題是 - 此代碼無法使用https，因此當您在瀏覽器中打開並通過上述代碼提供的url時，會產生單獨的響應。