Difference between revisions of "TFileStream"
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end; | end; | ||
</syntaxhighlight> | </syntaxhighlight> | ||
| + | |||
| + | == See also == | ||
| + | * [[doc:rtl/classes/tfilestream.html|TFileStream doc]] | ||
| + | * [[doc:rtl/classes/tstream.html|TStream doc]] | ||
[[Category:Tutorials]] | [[Category:Tutorials]] | ||
{{AutoCategory}} | {{AutoCategory}} | ||
Revision as of 01:04, 26 August 2016
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A TFileStream is a descendant of TStream that gets/stres its data from/to a file on disk. A TFileStream reads entire file data into memory and vice versa.
| Constant | Decimal | Description |
|---|---|---|
| fmCreate | 65280 | Creates a new file |
| fmOpenRead | 0 | opens a file for reading |
| fmOpenWrite | 1 | opens a file for writing |
| fmOpenReadWrite | 2 | opens a file for reading and writing |
| fmShareDenyWrite | 32 | prohibit writing if file is already opened |
read from file fnam.
function readstream( fnam: string ): string;
var
strm: TFileStream;
n: longint;
txt: string;
begin
txt := '';
strm := TFileStream.Create( fnam, fmOpenRead or fmShareDenyWrite );
try
n := strm.Size;
SetLength( txt, n );
strm.Read( txt[1], n );
finally
FreeAndNil( strm );
end;
result := txt;
end;Write txt to file fnam.
procedure writestream( fnam: string; txt: string );
var
strm: TFileStream;
n: longint;
begin
strm := TFileStream.Create( fnam, fmCreate );
n := Length( txt );
try
strm.Position := 0;
strm.Write( txt[1], n );
finally
FreeAndNil( strm );
end;
end;See also
