В принципе, я уже делал такой пост
Как отправить файл с помощью idHTTP и принять его на idHTTPServer ?
Но в данном случае хочу акцентировать внимание именно на отправке и приеме параметров методом POST.
Как это будет выглядеть?
Как отправить POST запрос с параметрами при помощи idHTTP?
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uses IdMultipartFormData |
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procedure TVisualFrame_HTTP.SendPOSTParamsClick(Sender: TObject); var PostData: TIdMultiPartFormDataStream; FileName:string; Error:string; ResponseText:string; begin if not IsHTTPConnectionOk(Error,ResponseText) then Exit; PostData := TIdMultiPartFormDataStream.Create; try idHTTP.Request.Referer := HTTPServerToRequest+'/SomeURICommand'; idHTTP.Request.ContentType := 'multipart/form-data'; PostData.AddFormField('SomePOSTParam1','SomePostParamValue1'); PostData.AddFormField('SomePOSTParam2','SomePostParamValue2'); // PostData.AddFile('attach', FileName, 'application/x-rar-compressed'); // PostData.AddFormField('field2', 'msg2'); // PostData.AddFormField('action', 'post'); idHTTP.Post(HTTPServerToRequest+'/SomeURICommand', PostData); Application.ProcessMessages; finally if(Assigned(PostData)) then PostData.Free; ShowMessage('idHTTP Sent OK'); end; end; |
Как принять этот запрос на сервере и декодировать?
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procedure TfHTTPServer.IdHTTPServerCommandGet (AContext: TIdContext; ARequestInfo: TIdHTTPRequestInfo; AResponseInfo: TIdHTTPResponseInfo); var DecodePostRequest:TDecodePostRequest; PostParams:TStringList; begin PostParams:=TStringList.Create; if ARequestInfo.URI=('/SomeURICommand') then begin PostParams.Clear; DecodePostRequest:=TDecodePostRequest.Create(Self); DecodePostRequest.Decode(AContext,ARequestInfo,AResponseInfo,PostParams); FreeAndNil(DecodePostRequest); ShowMessage( 'SomePOSTParam1='+ PostParams.Values['SomePOSTParam1'] // Example how to check one of the params... ); end; FreeAndNil(PostParams); end; |
Само декодирование я вынес в отдельный юнит
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unit uDecodePOstRequest; interface uses System.SysUtils, System.Variants, System.Classes, Vcl.Graphics, Vcl.Controls, Vcl.Forms, Vcl.Dialogs, IdBaseComponent, IdComponent, IdCustomTCPServer, IdCustomHTTPServer, IdHTTPServer, Vcl.StdCtrls, HTTPApp, IdMultipartFormData, IdContext ; type TQuery = record params: TStringList; values: TStringList; end; type TDecodePostRequest = class(TDataModule) private Params:TStringList; Query: TQuery; function ReadMultipartRequest(const Boundary: Ansistring; ARequest: Ansistring; var AHeader: TStringList; var Data: Ansistring): Ansistring; procedure QueryParsing(list: TStrings; var params, values: TStringList); procedure QueryPreParsing(s: string; var res: TStringList); { Private declarations } public { Public declarations } constructor Create(AOwner: TComponent); override; destructor Destroy; override; procedure Decode(AContext: TIdContext; ARequestInfo: TIdHTTPRequestInfo; AResponseInfo: TIdHTTPResponseInfo; var PostParams:TStringList); end; //var // ReceiveOneFileDM: TReceiveOneFile; implementation {%CLASSGROUP 'Vcl.Controls.TControl'} {$R *.dfm} uses uHTTPServer_Main; var HTTPServer_Main_UnitVar:TfHTTPServer; procedure TDecodePostRequest.Decode(AContext: TIdContext; ARequestInfo: TIdHTTPRequestInfo; AResponseInfo: TIdHTTPResponseInfo; var PostParams:TStringList); const MaxReadBlockSize = 8192; UploadPath = ''; var MemoryStream: TMemoryStream; Boundary, BufferStr, AllContent: Ansistring; Header: TStringList; ByteToRead, ReadedBytes, RSize: Integer; Buffer: PAnsiChar; Data: Ansistring; HList: TStrings; OutStream: TFileStream; begin AResponseInfo.Server := 'ver1'; AResponseInfo.CacheControl := 'no-cache'; if(ARequestInfo.Host = 'localhost:40000') then begin // if(ARequestInfo.Document = '/index.php') then begin if (Pos('multipart/form-data', LowerCase(ARequestInfo.ContentType))>0) and // далее идёт обработка multipart (Pos('boundary', LowerCase(ARequestInfo.ContentType))>0) then begin Header := TStringList.Create; try ExtractHeaderFields([';'], [' '], PChar(ARequestInfo.ContentType), Header, False, False); Boundary := Header.Values['boundary']; finally Header.Free; end; MemoryStream := TMemoryStream.Create; try MemoryStream.LoadFromStream(ARequestInfo.PostStream); AllContent := ''; ByteToRead := ARequestInfo.ContentLength; try while ByteToRead > 0 do begin RSize := MaxReadBlockSize; if RSize > ByteToRead then RSize := ByteToRead; GetMem(Buffer, RSize); try ReadedBytes := MemoryStream.Read(Buffer^, RSize); SetString(BufferStr, Buffer, ReadedBytes); AllContent := AllContent + BufferStr; finally FreeMem(Buffer, RSize); end; ByteToRead := ARequestInfo.ContentLength - Length(AllContent); end; AResponseInfo.ContentText := 'ok'; AResponseInfo.WriteContent; except on E: Exception do begin AResponseInfo.ContentText := E.Message; AResponseInfo.WriteContent; end; end; finally MemoryStream.Free; end; if ARequestInfo.ContentLength = Length(AllContent) then while Length(AllContent) > Length('--' + Boundary + '--' + #13#10) do begin Header := TStringList.Create; HList := TStringList.Create; try AllContent := ReadMultipartRequest('--' + Boundary, AllContent, Header, Data); ExtractHeaderFields([';'], [' '], PChar(Header.Values['Content-Disposition']), HList, False, True); if (Header.Values['Content-Type'] <> '') and (Data <> '') and(HList.Values['filename']<>'') // << corrected here then begin OutStream:=TFileStream.Create(UploadPath + ExtractFileName(HList.Values['filename']), fmCreate); try try OutStream.WriteBuffer(Pointer(Data)^, Length(Data)); HTTPServer_Main_UnitVar.mmo3.Lines.Add('File Successfully Uploaded'); except on E:Exception do ShowMessage(E.ClassName+' Exception Raised : ' +#13#10+#13#10+E.Message); end; finally OutStream.Free; end end else begin HTTPServer_Main_UnitVar.mmo3. Lines.Add(Format('<p>Field <b>%s</b> = %s',[HList.Values['name'], Data])); // Collecting Post Params in External Var PostParams.Add(HList.Values['name']+'='+Data); // PS Gathering Params Here end; finally HTTPServer_Main_UnitVar.mmo1.Lines := Header; HTTPServer_Main_UnitVar.mmo2.Lines := HList; Header.Free; HList.Free; end; end; end; if(Pos('application/x-www-form-urlencoded', LowerCase(ARequestInfo.ContentType))>0) then begin MemoryStream := TMemoryStream.Create; try MemoryStream.LoadFromStream(ARequestInfo.PostStream); AllContent := ''; ByteToRead := ARequestInfo.ContentLength; try while ByteToRead > 0 do begin RSize := MaxReadBlockSize; if RSize > ByteToRead then RSize := ByteToRead; GetMem(Buffer, RSize); try ReadedBytes := MemoryStream.Read(Buffer^, RSize); SetString(BufferStr, Buffer, ReadedBytes); AllContent := AllContent + BufferStr; finally FreeMem(Buffer, RSize); end; ByteToRead := ARequestInfo.ContentLength - Length(AllContent); end; AResponseInfo.ContentText := 'ok'; AResponseInfo.WriteContent; except on E: Exception do begin AResponseInfo.ContentText := E.Message; AResponseInfo.WriteContent; end; end; finally MemoryStream.Free; end; QueryPreParsing(AllContent, Params); QueryParsing(Params, Query.params, Query.values); HTTPServer_Main_UnitVar.mmo1.Lines := Query.params; HTTPServer_Main_UnitVar.mmo2.Lines := Query.values; end; end; end; end; function TDecodePostRequest.ReadMultipartRequest(const Boundary: Ansistring; ARequest: Ansistring; var AHeader: TStringList; var Data: Ansistring): Ansistring; var Req, RHead: string; i: Integer; begin Result := ''; AHeader.Clear; Data := ''; if (Pos(Boundary, ARequest) < Pos (Boundary + '--', ARequest)) and (Pos(Boundary, ARequest) = 1) then begin Delete(ARequest, 1, Length(Boundary) + 2); Req := Copy(ARequest, 1, Pos(Boundary, ARequest) - 3); Delete(ARequest, 1, Length(Req) + 2); RHead := Copy(Req, 1, Pos(#13#10#13#10, Req)-1); Delete(Req, 1, Length(RHead) + 4); AHeader.Text := RHead; for i := 0 to AHeader.Count - 1 do if Pos(':', AHeader.Strings[i]) > 0 then AHeader.Strings[i] := Trim(Copy(AHeader.Strings[i], 1, Pos(':', AHeader.Strings[i])-1)) + '=' + Trim(Copy(AHeader.Strings[i], Pos(':', AHeader.Strings[i])+1, Length(AHeader.Strings[i]) - Pos(':', AHeader.Strings[i]))); Data := Req; Result := ARequest; end end; //-------------------------Some Additional methods procedure TDecodePostRequest.QueryPreParsing(s: string; var res: TStringList); var ss: string; p: integer; begin if(Pos('=',s) <= 0) then begin Exit; end; end; constructor TDecodePostRequest.Create(AOwner: TComponent); begin inherited; if (AOwner is TfHTTPServer) then HTTPServer_Main_UnitVar:=(AOwner as TfHTTPServer); Query.params := TStringList.Create; Query.values := TStringList.Create; Params:=TStringList.Create; end; destructor TDecodePostRequest.Destroy; begin inherited; FreeAndNil(Query.params); FreeAndNil(Query.values); FreeAndNil(Params); end; procedure TDecodePostRequest.QueryParsing(list: TStrings; var params: TStringList; var values: TStringList); var i: Integer; p: integer; begin params.Clear; values.Clear; for i := 0 to list.Count-1 do begin p := Pos('=', list.Strings[i]); params.Add(Copy(list.Strings[i], 1, p-1)); values.Add(Copy(list.Strings[i], p+1, Length(list.Strings[i]))); end; end; end. |