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TBufDataset SaveToStream and LoadFromStream, how?
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Author
Topic: TBufDataset SaveToStream and LoadFromStream, how? (Read 1200 times)
tatamata
Hero Member
Posts: 787
TBufDataset SaveToStream and LoadFromStream, how?
«
on:
February 10, 2020, 09:17:24 pm »
Hello,
Could somebody please provide full example how to save TBufDataset to a file stream and how to load back from a saved file stream?
Logged
lucamar
Hero Member
Posts: 4219
Re: TBufDataset SaveToStream and LoadFromStream, how?
«
Reply #1 on:
February 10, 2020, 10:08:21 pm »
Canonical example: The standard implementation of
SaveToFile
and
LoadFromFile
(in
$FPCSource/packages/fcl-db/src/base/bufdataset.pas
):
Code: Pascal
[Select]
[+]
[-]
procedure
TCustomBufDataset
.
LoadFromFile
(
AFileName
:
string
;
Format
:
TDataPacketFormat
)
;
var
AFileStream
:
TFileStream
;
begin
if
AFileName
=
''
then
AFileName
:
=
FFileName
;
AFileStream
:
=
TFileStream
.
Create
(
AFileName
,
fmOpenRead
)
;
try
LoadFromStream
(
AFileStream
,
Format
)
;
finally
AFileStream
.
Free
;
end
;
end
;
procedure
TCustomBufDataset
.
SaveToFile
(
AFileName
:
string
;
Format
:
TDataPacketFormat
)
;
var
AFileStream
:
TFileStream
;
begin
if
AFileName
=
''
then
AFileName
:
=
FFileName
;
AFileStream
:
=
TFileStream
.
Create
(
AFileName
,
fmCreate
)
;
try
SaveToStream
(
AFileStream
,
Format
)
;
finally
AFileStream
.
Free
;
end
;
end
;
Logged
Turbo Pascal 3 CP/M - Amstrad PCW 8256 (512 KB !!!)
Lazarus/FPC 2.0.8/3.0.4 & 2.0.12/3.2.0 - 32/64 bits on:
(K|L|X)Ubuntu 12..18, Windows XP, 7, 10 and various DOSes.
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