.net - How to flash a spark core from C# -


i trying flash spark core c# application. keep getting { error: nothing do? } response.

below code

var url = string.format("https://api.spark.io/v1/devices/{0}", sparkdeviceid);  using (var client = new httpclient()) {     client.defaultrequestheaders.authorization = new system.net.http.headers.authenticationheadervalue("bearer", accesstoken);     using (var formdata = new multipartformdatacontent())     {         httpcontent filecontent = new bytearraycontent(encoding.ascii.getbytes(rom));         //client.sendasync()         formdata.add(filecontent, "file", "file");         var response = client.putasync(url, formdata).result;          if (!response.issuccessstatuscode)             throw new exception("an error occurred during rom flash!");          var responsestream = response.content.readasstreamasync().result;         using (var reader = new streamreader(responsestream, true))         {             var result = reader.readtoend();         }     }     return true; }

the documentation reads:

the api request should encoded multipart/form-data file field populated.

i believe problem endpoint doesn't see file. idea on how resolve this?

finally got working.

the issue way .net generated content-disposition header file form data.

i used fiddler compare output of successful put request put request code generating:

successful put request generated using curl:

put http://127.0.0.1:8888/ http/1.1 user-agent: curl/7.33.0 host: 127.0.0.1:8888 accept: */* content-length: 2861 expect: 100-continue content-type: multipart/form-data; boundary=------------------------5efcf64a370f13c8  --------------------------5efcf64a370f13c8 content-disposition: form-data; name="file"; filename="ms.ino" content-type: application/octet-stream  ...

my put request (unsuccessful):

put https://api.spark.io/v1/devices/{deviceid} http/1.1 authorization: bearer {access_token} content-type: multipart/form-data; boundary="135f5425-9342-4ffa-a645-99c04834026f" host: api.spark.io content-length: 2878 expect: 100-continue  --135f5425-9342-4ffa-a645-99c04834026f content-type: application/octet-stream content-disposition: form-data; name=file; filename=file.ino; filename*=utf-8''file.ino  ...

if you'll notice difference in content-type actual file being sent:

successful: content-disposition: form-data; name="file"; filename="ms.ino"

unsuccessful: content-disposition: form-data; name=file; filename=file.ino; filename*=utf-8''file.ino

most specifically, resolution add quotes around name attribute.

resolution:

formdata.add(filecontent, "\"file\"", "file.ino");

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