The `CURL` command that I am using is shown below.
curl -F 'file=@/home/karthik/Workspace/downloadfile.out'
http://127.0.0.1:5000/file-upload --verbose
The response from the server is shown below.
* Trying 127.0.0.1...
* Connected to 127.0.0.1 (127.0.0.1) port 5000 (#0)
> POST /file-upload HTTP/1.1
> Host: 127.0.0.1:5000
> User-Agent: curl/7.47.0
> Accept: */*
> Content-Length: 663876790
> Expect: 100-continue
> Content-Type: multipart/form-data;
boundary=------------------------4e96ef0714498bd7
>
< HTTP/1.1 100 Continue
* HTTP 1.0, assume close after body
< HTTP/1.0 201 CREATED
< Content-Type: application/json
< Content-Length: 46
< Server: Werkzeug/0.16.0 Python/3.5.2
< Date: Sat, 14 Dec 2019 07:05:15 GMT
<
{
"message": "File successfully uploaded"
}
* Closing connection 0
I want to implement the same command in C/C++ using libcurl. I am using the
following function.
int FileUploadDownload::upload(const std::string &filename, const
std::string &url) {
CURL *curl;
CURLcode res;
struct stat file_info;
curl_off_t speed_upload, total_time;
FILE *fd;
fd = fopen(filename.c_str(), "rb");
if(!fd) {
m_logger->errorf("unable to open file: %s\n",strerror(errno));
return 1;
}
if(fstat(fileno(fd), &file_info) != 0) {
m_logger->errorf("unable to get file stats: %s\n",strerror(errno));
return 2;
}
std::cout << "filename : "<< filename << std::endl;
std::cout << "url : " << url << std::endl;
curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL,
url.c_str());
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, filename.c_str());
curl_easy_setopt(curl, CURLOPT_POST, 1L);
curl_easy_setopt(curl, CURLOPT_READDATA, fd);
curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE,
(curl_off_t) file_info.st_size);
curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
res = curl_easy_perform(curl);
if (res != CURLE_OK) {
m_logger->errorf("curl_easy_perform() failed:
%s\n",curl_easy_strerror(res));
} else {
curl_easy_getinfo(curl, CURLINFO_SPEED_UPLOAD, &speed_upload);
curl_easy_getinfo(curl, CURLINFO_TOTAL_TIME, &total_time);
m_logger->infof("Speed: %" CURL_FORMAT_CURL_OFF_T " bytes/sec
during %"
CURL_FORMAT_CURL_OFF_T ".%06ld seconds\n",
speed_upload,
(total_time / 1000000), (long) (total_time %
1000000));
}
}
return 0;
}
The below is the result that I get from the server.
The result that I get is shown below.
* Trying 127.0.0.1...
* Connected to 127.0.0.1 (127.0.0.1) port 5000 (#0)
> POST /file-upload HTTP/1.1
> Host: 127.0.0.1:5000
> User-Agent: curl/7.47.0
> Accept: */*
> Content-Length: 550
> Expect: 100-continue
> Content-Type: multipart/form-data;
boundary=------------------------c8ef4837136fca99
>
< HTTP/1.1 100 Continue
* HTTP 1.0, assume close after body
< HTTP/1.0 201 CREATED
< Content-Type: application/json
< Content-Length: 46
< Server: Werkzeug/0.16.0 Python/3.5.2
< Date: Sat, 14 Dec 2019 07:09:47 GMT
<
{
"message": "File successfully uploaded"
}
* Closing connection 0
My aim is to mimic the curl command above in the C/C++ code below. What am I
doing wrong ?
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