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(C#) HTTP multipart/form-data UploadDemonstrates how to upload files to an HTTP server using a multipart/form-data POST.
// This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. Chilkat.Http http = new Chilkat.Http(); Chilkat.HttpRequest req = new Chilkat.HttpRequest(); req.HttpVerb = "POST"; req.ContentType = "multipart/form-data"; req.Path = "rcvFormDataUpload.aspx"; // Send an "Expect: 100-continue" header in the request. // This causes the HTTP server to end a 100-continue response // immediately after receiving the HTTP header. The client // (Chilkat) will receive this intermediate response, and if // it's not an error response, it knows that the HTTP server will // accept the data that is forthcoming. // The alternative is to get an error response after trying to upload // the entire contents of the files. req.AddHeader("Expect","100-continue"); // Call AddFileForUpload2 for each file to be uploaded in the HTTP multipart/form-data POST // To allow Chilkat to determine the content-type automatically based on file-extension, // call AddFileForUpload instead. // The 1st arg is the filename passed in the HTTP request. // The 2nd arg is the path in the local filesytem. // The file is not loaded into memory. It is streamed directly from the file // when the HTTP POST is sent. bool success = req.AddFileForUpload2("starfish.jpg","c:/qa_data/starfish.jpg","image/jpg"); if (success != true) { Debug.WriteLine(req.LastErrorText); return; } success = req.AddFileForUpload("something.pdf","c:/qa_data/something.pdf"); if (success != true) { Debug.WriteLine(req.LastErrorText); return; } // Its also possible to add a file from a string: success = req.AddStringForUpload("test.xml","test.xml","<abc>This is the test.xml content</abc>","utf-8"); // We'll assume success since no files are involved.. // This sends the HTTP request (with 3 files being uploaded) to // http://www.mywebserver123abc.com/rcvFormDataUpload.aspx Chilkat.HttpResponse resp = null; resp = http.SynchronousRequest("www.mywebserver123abc.com",80,false,req); if (http.LastMethodSuccess != true) { Debug.WriteLine(http.LastErrorText); } else { Debug.WriteLine("HTTP response status: " + Convert.ToString(resp.StatusCode)); // See the online reference documentation for // other information that can be obtained from the response object. } // To send using SSL/TLS, do this instead. // This sends to https://www.mywebserver123abc.com/rcvFormDataUpload.aspx resp = http.SynchronousRequest("www.mywebserver123abc.com",443,true,req); if (http.LastMethodSuccess != true) { Debug.WriteLine(http.LastErrorText); } else { Debug.WriteLine("HTTP response status: " + Convert.ToString(resp.StatusCode)); // See the online reference documentation for // other information that can be obtained from the response object. } |
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