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copied!<p>What OAuth signature method are you using? If it's anything but plaintext, then I believe the problem is that you're not passing the body of the HTTP request to <code>getURLQueryString</code>. The body needs to be part of the string that's signed. This explains why you've been able to get a few <code>GET</code> operations to work; those requests don't have a body.</p> <p>Side note: it looks like you're using the POST form of file upload, which, <a href="https://www.dropbox.com/developers/core/docs#files-POST" rel="nofollow">as the docs say</a> is considerably more complex than <a href="https://www.dropbox.com/developers/core/docs#files_put" rel="nofollow">PUT</a>. I think your life will be better if you switch. :-) For example, I think the <code>submit</code> field that you're adding will probably cause the call to not work.</p> <p><strong>EDIT</strong>: Here's a full working example using a manually-constructed plaintext signature. Fill in the app key, app secret, token, and token secret, and be sure to have a file called "hello.txt" for this to work:</p> <pre><code>#include <stdio.h> #include <curl/curl.h> #include <iostream> #include <fstream> using namespace std; size_t read_data(void *ptr, size_t size, size_t nmeb, void *stream) { return fread(ptr,size,nmeb,(FILE*)stream); } int main(void) { CURL *curl; CURLcode res; FILE * rfp = fopen("hello.txt", "r"); string appkey = "<APP KEY>"; string appsecret = "<APP SECRET>"; string token = "<ACCESS TOKEN>"; string token_secret = "<ACCESS TOKEN SECRET>"; curl = curl_easy_init(); if(curl) { curl_easy_setopt(curl, CURLOPT_URL, "https://api-content.dropbox.com/1/files_put/sandbox/hello.txt"); struct curl_slist *headers = NULL; string header = "Authorization: OAuth oauth_version=\"1.0\", oauth_signature_method=\"PLAINTEXT\", oauth_consumer_key=\"" + appkey + "\", oauth_token=\"" + token + "\", oauth_signature=\"" + appsecret + "&" + token_secret + "\""; headers = curl_slist_append(headers, header.c_str()); curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers); curl_easy_setopt(curl, CURLOPT_PUT, 1L); curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_data); curl_easy_setopt(curl, CURLOPT_READDATA, rfp); res = curl_easy_perform(curl); curl_slist_free_all(headers); if(res != CURLE_OK) fprintf(stderr, "curl_easy_perform() failed: %s\n", curl_easy_strerror(res)); curl_easy_cleanup(curl); } fclose(rfp); return 0; } </code></pre>

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