Ch := ''@'';
Fp.Write(Ch, 1);
Fp.CopyFrom(FStream, 0);
finally
Fp.Free;
end;
end;

procedure TIbStorage.SaveHead(ADataSet: TDataSet; Fp: TStream);
Var
I : Integer;
Ch: Char;
begin
if Not ADataSet.Active then ADataSet.Active := True;
WriteAStr(Fp, Flag);
WriteAStr(Fp, FRptTitle);
WriteAStr(Fp, FPageHead);
WriteAStr(Fp, FPageFoot);
FFieldCount := ADataSet.Fields.Count;
FRecordCount := ADataSet.RecordCount;
WriteAStr(Fp, IntToStr(ADataSet.Fields.Count));
WriteAStr(Fp, IntToStr(ADataSet.RecordCount));
Ch := ''@'';
Fp.Write(Ch, 1);
end;

procedure TIbStorage.IndexFields(ADataSet: TDataSet);
var
I : Integer;
AField: TField;
begin
For I := 0 to ADataSet.Fields.Count - 1 do
begin
AField := ADataSet.Fields[I];
//不用FFieldNames.Values[AField.FieldName] := AField.DisplayLabel;是考虑效率
FFieldNames.Add(AField.FieldName + ''='' + AField.DisplayLabel);
FFieldNames.Add(AField.FieldName + ''DataType='' + IntToStr(Ord(AField.DataType)));
end;
end;

procedure TIbStorage.LoadTableToStream(ADataSet: TDataSet);
var
No: Integer;
I, J, Size: Integer;
Tmp, Id, Str : string; //id=string(RecNO) + string(FieldNo)
Len: Integer;
Ch : Char;
BlobStream: TBlobStream;
begin
if Not FOpenFlag then
begin
showmessage('' 对象没有打开'');
Exit;
end;
try
ADataSet.DisableControls;
ADataSet.First;
No := 0;
FStreamIndex.Clear;
FStream.Size := 0;
While Not ADataSet.Eof do
begin
No := No + 1;
For J := 0 to ADataSet.Fields.Count - 1 do
begin
Id := Inttostr(NO) + ''_'' + IntToStr(J);
//建立流的位置的索引, 索引指向: Size#0Content
FStreamIndex.Add(Id + ''='' + IntToStr(FStream.Position));
//存储字段信息到流中
SaveFieldToStream(FStream, ADataSet.Fields[J]);
end;
ADataSet.Next;
end;
finally
ADataSet.EnableControls;
end;
end;

//如果一个字段的当前内容为空或者BlobSize<=0,则只写入字段大小为0, 不写入内容
procedure TIbStorage.SaveFieldToStream(AStream: TStream; AField: TField);
var
Size: Integer;
Ch: Char;
XF: TStream;
Str: string;
begin
if AField.IsBlob then
begin
//如何把一个TBlobField字段的内容存储为流
Xf := TBlobStream.Create(TBlobField(AField), bmread);
try
if Xf.Size > 0 then
begin
Size := Xf.Size;
WriteAInteger(AStream, Size);
AStream.CopyFrom(Xf, Xf.Size);
end
else
WriteAInteger(AStream, 0);
finally
XF.Free;
end;
end
else
begin
Str := AField.AsString;
Size := Length(Str);
WriteAInteger(AStream, Size);
if Size <> 0 then
AStream.Write(Pointer(Str)^, Size);
//WriteAstr(AStream, Str);
end;
Ch := ''@'';
AStream.Write(Ch, 1);
end;

//------------Load Data
procedure TIbStorage.LoadFromFile(AFileName: string);
var
Fp: TFileStream;
Check: string;
begin
Reset;
try
if Not FileExists(AFileName) then
begin
showmessage('' 文件不存在:'' + AFileName);
Exit;
end;
Fp := TFileStream.Create(AFileName, fmOpenRead);
Check := ReadAStr(Fp);
if Check <> Flag then
begin
Application.MessageBox('' 非法文件格式'', ''错误'', Mb_Ok + Mb_IconError);
Exit;
end;
GetHead(Fp);
GetFieldNames(Fp);
GetIndex(Fp);
FStream.CopyFrom(Fp, Fp.Size-Fp.Position);
finally
Fp.Free;
end;
end;

procedure TIbStorage.GetHead(Fp: TF