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    <p>Your code is close. You are only sending your file field but not your text fields. To do all three, try this instead:</p> <pre><code>function HttpPostFile(const URL, InputText1FieldName, InputText1, InputText2FieldName, InputText2, InputFileFieldName, InputFileName: string; InputFileData: TStream; ResultData: TStrings): Boolean; var HTTP: THTTPSend; Bound: string; begin Bound := IntToHex(Random(MaxInt), 8) + '_Synapse_boundary'; HTTP := THTTPSend.Create; try WriteStrToStream(HTTP.Document, '--' + Bound + CRLF + 'Content-Disposition: form-data; name=' + AnsiQuotedStr(InputText1FieldName, '"') + CRLF + 'Content-Type: text/plain' + CRLF + CRLF); WriteStrToStream(HTTP.Document, InputText1); WriteStrToStream(HTTP.Document, CRLF + '--' + Bound + CRLF + 'Content-Disposition: form-data; name=' + AnsiQuotedStr(InputText2FieldName, '"') + CRLF + 'Content-Type: text/plain' + CRLF + CRLF); WriteStrToStream(HTTP.Document, InputText2); WriteStrToStream(HTTP.Document, CRLF + '--' + Bound + CRLF + 'Content-Disposition: form-data; name=' + AnsiQuotedStr(InputFileFieldName, '"') + ';' + CRLF + #9'filename=' + AnsiQuotedStr(InputFileName, '"') + CRLF + 'Content-Type: application/octet-string' + CRLF + CRLF); HTTP.Document.CopyFrom(InputFileData, 0); WriteStrToStream(HTTP.Document, CRLF + '--' + Bound + '--' + CRLF); HTTP.MimeType := 'multipart/form-data; boundary=' + Bound; Result := HTTP.HTTPMethod('POST', URL); if Result then ResultData.LoadFromStream(HTTP.Document); finally HTTP.Free; end; end; </code></pre> <p>If you switch to Indy, you can use its <code>TIdMultipartFormDataStream</code> class:</p> <pre><code>function HttpPostFile(const URL, InputText1FieldName, InputText1, InputText2FieldName, InputText2, InputFileFieldName, InputFileName: string; InputFileData: TStream; ResultData: TStrings): Boolean; var HTTP: TIdHTTP; Input: TIdMultipartFormDataStream; Output: TMemoryStream; begin Result := False; try Output := TMemoryStream.Create; try HTTP := TIdHTTP.Create; try Input := TIdMultipartFormDataStream.Create; try Input.AddFormField(InputText1FieldName, InputText1); Input.AddFormField(InputText2FieldName, InputText2); Input.AddFormField(InputFileFieldName, 'application/octet-stream', '', InputFileData, InputFileName); HTTP.Post(URL, Input, Output); finally Input.Free; end; finally HTTP.Free; end; Output.Position := 0; ResultData.LoadFromStream(Output); Result := True; finally Output.Free; end; except end; end; </code></pre>
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    1. POHow to send a file AND other POST data with Synapse
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