• 通过Remobject组件存储图片


    应用环境:服务端:TROBinMessage,TROIndyHTTPServer

             提供服务接口:        

     IBinaryMidService = interface

                ['{51904085-6D27-4EDA-A55D-A9EE21686894}']

                   function Add(Const ANum:AnsiString; const AType: AnsiString; const AValue: Binary): Integer;

    end;

       客户端:TROBinMessage,TROWinInetHTTPChannel,TRORemoteService

       数据库:Oracle10,图片字段类型为BLOB

     

    简单介绍:客户端把图片读入到流中并通过IBinaryMidService服务传输到服务器,然后有服务器存入到数据库中.

     

    一:客户端生成流通过服务传输到服务器

     1 procedure SavePic;
    2 var
    3 tmpStream:TROBinaryMemoryStream;
    4 VBinaryMidService:IBinaryMidService;
    5 begin
    6 tmpStream:=TROBinaryMemoryStream.Create;
    7 VBinaryMidService:=TBinaryMidService_Proxy.Create(ROMessage,ROChannel);
    8 Image1.Picture.Graphic.SaveToStream(tmpStream) ;
     9   VBinaryMidService.Add('0001',PicType,tmpStream);
    10 end;

    二:服务端接收流增加到数据库

    function TBinaryMidService.Add(Const ANum: AnsiString; const AType: AnsiString; const AValue: Binary): Integer;
    var
    tmpSQLStr:
    string;
    begin
    tmpSQLStr:
    =format('insert into test(num,AType,pic) values (%s,%s,:0)',[quotedstr(ANum),quotedstr(AType)]);
    DBOrder.AddPic(tmpSQLStr,AValue);
    end;

    //--------------ucDBOrder----------------------
    function DBOrder.AddPic(ASQLStr:string;AValue)
    var
    QryTDB:TADOQuery;
    begin
    QryTDB:
    = TADOQuery.Create(nil);
    QryTDB.Close;
    QryTDB.SQL.Clear;
    QryTDB.Connection:
    =Conn;
    QryTDB.SQL.Add(SQLStr);
    QryTDB.Parameters.ParamByName(
    '1').LoadFromStream(AValue,ftBlob);
    QryTDB.ExecSQL;
    FreeAndNil(QryTDB);
    end;

    三:客户端得到数据并显示图片

    View Code
     1 procedure showPic;
    2 var
    3 Data:Variant;
    4 VBinaryMidService:IBinaryMidService;
    5 PicFile:TGraphic;
    6 begin
    7 //得到数据赋值给
    8 VBinaryMidService:=TBinaryMidService_Proxy.Create (ROMessage,ROChannel);
    9 VBinaryMidService.GetPic('00001',Data);
    10 ClientDataSet.Data:=Data;
    11 //显示图片
    12 if not ClientDataSet1.FieldByName('Pic').IsNull then
    13 begin
    14 if ClientDataSet1.FieldByName('PicType').AsString='BMP' then
    15 //显示bmp文件
    16 PicFile:=TBitmap.Create;
    17 else
    18 if ClientDataSet1.FieldByName('PicType').AsString='JPG' then
    19 begin
    20 //显示JPG文件
    21 PicFile:=TJPEGImage.Create;
    22 end else
    23 if ClientDataSet1.FieldByName('PicType').AsString='ICO' then
    24 begin
    25 //显示ICO文件
    26 //IcoFile:=TIcon.Create; // IcoFile.Free;
    27 PicFile:=TIcon.Create;
    28 end else
    29 if ClientDataSet1.FieldByName('PicType').AsString='PNG' then
    30 begin
    31 //显示PNG文件
    32 PicFile:=TPNGObject.Create;
    33 end else
    34 if ClientDataSet1.FieldByName('PicType').AsString='GIF' then
    35 begin
    36 //显示PNG文件
    37 PicFile:=TGIFImage.Create;
    38 end;
    39 mStream:=TMemoryStream.Create ;
    40 TBlobField(ClientDataSet1.FieldByName('Pic')).SaveToStream(mStream);
    41 mStream.Position :=0;
    42 PicFile.LoadFromStream(MStream);
    43
    44 image1.Picture.Assign(PicFile);
    45 PicFile.Free;
    46 mStream.Free;
    47 end;
    48 end;

    注:需下载gifimage.pas,pngimage插件(机器如果装了fastReport4,引用frxpngimage单元),Image控件才能支持PNG,GIF

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  • 原文地址:https://www.cnblogs.com/tsolarboy/p/2161702.html
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