bitmapproviderimpl.pas

来自「Delphi开发webservice的一套例子」· PAS 代码 · 共 59 行

unit BitmapProviderImpl;

interface

uses
  BitmapProviderIntf, InvokeRegistry, Classes, EncdDecd;

type
  TBitmapProvider = class(TInvokableClass, IBitmapProvider)
  private
    function GetBitmapFile(const sBtName: String) : String;
    function MakeBitmpIntoString(const sFileName: String) : String;
  public
    function GetBitmap(const sBtName : String) : String; stdcall;
  end;

implementation

{ TBitmapProvider }

function TBitmapProvider.GetBitmap(const sBtName: String): String;
var
  sFileName : String;
begin
  sFileName := GetBitmapFile(sBtName);
  Result := MakeBitmpIntoString(sFileName);
end;

function TBitmapProvider.GetBitmapFile(const sBtName: String): String;
begin
  //Make it simple and fast, this is just a demo
  Result := 'GordonLi1.JPG';
  if (sBtName = 'Gordon2') then
    Result := 'GordonLi2.JPG';
end;

function TBitmapProvider.MakeBitmpIntoString(
  const sFileName: String): String;
var
  ass : TStringStream;
  ams : TMemoryStream;
begin
  ams := TMemoryStream.Create;
  ass := TStringStream.Create('');
  try
    ams.LoadFromFile(sFileName);
    ams.SaveToStream(ass);
    Result := EncodeString(ass.DataString);
  finally
    ams.Free;
    ass.Free;
  end;
end;

initialization
  InvRegistry.RegisterInvokableClass(TBitmapProvider);

end.