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Upload a file using c++ via curl
Hi, I was googling for a way to upload a file to any cloud storage using c++ and came across dropbox api. I found the code, so I did a copy and paste to try and see if it works. I entered the Access ...
Greg-DB
Dropbox Community Moderator
Dropbox Community ModeratorЗдравко Thanks for helping out! I can't speak to why any particular language was or wasn't supported in an official SDK, but I'll pass this along as a feature request for an official C/C++ Dropbox SDK. I can't promise if or when that might be implemented though.
hb_ If you're still having trouble, please share the code you have so far so we can take a look.
For reference, when uploading a file to Dropbox via the Dropbox API /2/files/upload endpoint, the data for the file you want to upload needs to be sent in the request body. For example, you might do something like this:
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, "data for upload here");
To get the data you want to upload, you can use whatever local file I/O access you have to read the data from the local file.
Hi Greg-DB , thanks for replying so quick
I followed your suggestion and tried tp use std::ifstream like this:
CURL *curl;
CURLcode res;
/* In windows, this will init the winsock stuff */
curl_global_init(CURL_GLOBAL_ALL);
/* get a curl handle */
curl = curl_easy_init();
string test = "D:\\Desktop\\test.txt";
std::ifstream file(test);
if(curl)
{
printf ("Running curl test.\n");
struct curl_slist *headers=NULL; /* init to NULL is important */
headers = curl_slist_append(headers, "Authorization: Bearer <my_access_token>");
headers = curl_slist_append(headers, "Content-Type: application/octet-stream");
headers = curl_slist_append(headers, "Dropbox-API-Arg: {\"path\":\"/test.txt\"}");
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
curl_easy_setopt(curl, CURLOPT_URL, "https://content.dropboxapi.com/2/files/upload");
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, file);
curl_easy_setopt (curl, CURLOPT_SSL_VERIFYPEER, FALSE);
/* Perform the request, res will get the return code */
res = curl_easy_perform(curl);
/* Check for errors */
if(res != CURLE_OK)
fprintf(stderr, "curl_easy_perform() failed: %s\n",
curl_easy_strerror(res));
/* always cleanup */
curl_easy_cleanup(curl);
printf ("\nFinished curl test.\n");
}
curl_global_cleanup();
printf ("Done!\n");but it didn't compile displaying this error:
C:\Min.GW\curl-7.64.1-win64-mingw\include\curl\curl.h|2857|error: use of deleted function 'std::basic_ifstream<_CharT, _Traits>::basic_ifstream(const std::basic_ifstream<_CharT, _Traits>&) [with _CharT = char; _Traits = std::char_traits<char>]'|
But before that I had this code:
CURL *curl;
CURLcode res;
/* In windows, this will init the winsock stuff */
curl_global_init(CURL_GLOBAL_ALL);
/* get a curl handle */
curl = curl_easy_init();
if(curl)
{
printf ("Running curl test.\n");
struct curl_slist *headers=NULL; /* init to NULL is important */
headers = curl_slist_append(headers, "Authorization: Bearer <my_access_token>");
headers = curl_slist_append(headers, "Content-Type: application/octet-stream");
headers = curl_slist_append(headers, "Dropbox-API-Arg: {\"path\":\"/D:\\Desktop\\test.txt\"}");
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
curl_easy_setopt(curl, CURLOPT_URL, "https://content.dropboxapi.com/2/files/upload");
curl_easy_setopt (curl, CURLOPT_SSL_VERIFYPEER, FALSE);
/* Perform the request, res will get the return code */
res = curl_easy_perform(curl);
/* Check for errors */
if(res != CURLE_OK)
fprintf(stderr, "curl_easy_perform() failed: %s\n",
curl_easy_strerror(res));
/* always cleanup */
curl_easy_cleanup(curl);
printf ("\nFinished curl test.\n");
}
curl_global_cleanup();
printf ("Done!\n");And this would just create new folders and files in my account
Don't know if the codes I posted might be too long, the difference between the two is only at this line:
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, "test data for upload");
It's error to pass ifstream object as char sequence! You have to read the file content. :wink:
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