卷曲(C++) 错误：无法上传文件

Curl(C++) error: can't upload file

本文关键字：文件 C++ 错误 卷曲      更新时间：2023-10-16

看看这个函数：

string PostFile(string link, string filename, string postfilename){
    CURL *curl;
    CURLcode res;
    string readBuffer;
    struct curl_httppost *formpost = NULL;
    struct curl_httppost *lastptr = NULL;
    struct curl_slist *headerlist = NULL;
    static const char buf[] = "Expect :";
    curl_global_init(CURL_GLOBAL_ALL);
    curl_formadd(&formpost,
               &lastptr,
               CURLFORM_COPYNAME, postfilename.c_str(),
               CURLFORM_FILE, filename.c_str(),
               CURLFORM_END);
    curl_formadd(&formpost,
               &lastptr,
               CURLFORM_COPYNAME, "filename",
               CURLFORM_COPYCONTENTS, filename.c_str(),
               CURLFORM_END);
    curl = curl_easy_init();
    headerlist = curl_slist_append(headerlist, buf);
    if(!curl) return "Error";
    curl_easy_setopt(curl, CURLOPT_URL, link.c_str());
    curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
    curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerlist);
    curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
    curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallback);
    curl_easy_setopt(curl, CURLOPT_WRITEDATA, &readBuffer);
    res = curl_easy_perform(curl);
    if(res != CURLE_OK)
      fprintf(stderr, "curl_easy_perform() failed: %sn",
              curl_easy_strerror(res));
    curl_easy_cleanup(curl);     
    curl_formfree(formpost);
    curl_slist_free_all (headerlist);
    return readBuffer;
}

使用后 

PostFile("http://ilovedyourmother.ga/data/test/upload.php", "LOL.txt", "uploadfile");

它返回这样的错误

curl_easy_perform() failed: Failed to open/read local data from file/application

这个函数基于 curl postit2.c 示例 （http://curl.haxx.se/libcurl/c/postit2.html），实际上我不太明白它是如何工作的。请在此代码中找到错误，或者至少解释一下它的作用。

我遇到了同样的问题。为CURLFORM_FILE指定绝对路径并在此之后添加CURLFORM_FILENAME选项并仅提供该选项的文件名对我有用，如下所示。

curl_formadd(&formpost,
             &lastptr,
             CURLFORM_COPYNAME, "image_data",
             CURLFORM_FILE, "/home/user/TestImages/123.jpg",
             CURLFORM_FILENAME, "123.jpg",
             CURLFORM_CONTENTTYPE, "image/jpeg",
             CURLFORM_END);
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