mirror of
https://gitlab.com/freepascal.org/fpc/source.git
synced 2025-12-31 09:42:47 +01:00
126 lines
3.3 KiB
ObjectPascal
126 lines
3.3 KiB
ObjectPascal
Program Testobj;
|
|
|
|
uses Objects;
|
|
|
|
const
|
|
{ Possible error codes returned to DOS by this program }
|
|
EXIT_NOERROR = 0;
|
|
EXIT_NOTIFF = 1;
|
|
EXIT_DOSERROR = 2;
|
|
|
|
|
|
(*************************************************************************)
|
|
(* Create a stream error procedure which will be called on error of the *)
|
|
(* stream. Will Terminate executing program, as well as display info *)
|
|
(* on the type of error encountered. *)
|
|
(*************************************************************************)
|
|
Procedure StreamErrorProcedure(Var S: TStream); FAR;
|
|
Begin
|
|
If S.Status = StError then
|
|
Begin
|
|
WriteLn('ERROR: General Access failure. Halting');
|
|
Halt(EXIT_DOSERROR);
|
|
end;
|
|
If S.Status = StInitError then
|
|
Begin
|
|
Write('ERROR: Cannot Init Stream. Halting. ');
|
|
{ SPECIFIC TO DOS STREAMS }
|
|
Case S.ErrorInfo of
|
|
2: WriteLn('File not found.');
|
|
3: WriteLn('Path not found.');
|
|
5: Writeln('Access denied.');
|
|
else
|
|
WriteLn;
|
|
end;
|
|
Halt(EXIT_DOSERROR);
|
|
end;
|
|
If S.Status = StReadError then
|
|
Begin
|
|
WriteLn('ERROR: Read beyond end of Stream. Halting');
|
|
Halt(EXIT_DOSERROR);
|
|
end;
|
|
If S.Status = StWriteError then
|
|
Begin
|
|
WriteLn('ERROR: Cannot expand Stream. Halting');
|
|
Halt(EXIT_DOSERROR);
|
|
end;
|
|
If S.Status = StGetError then
|
|
Begin
|
|
WriteLn('ERROR: Get of Unregistered type. Halting');
|
|
Halt(EXIT_DOSERROR);
|
|
end;
|
|
If S.Status = StPutError then
|
|
Begin
|
|
WriteLn('ERROR: Put of Unregistered type. Halting');
|
|
Halt(EXIT_DOSERROR);
|
|
end;
|
|
end;
|
|
|
|
Procedure WriteInformation;
|
|
{ Writes information about the program }
|
|
Begin
|
|
WriteLn('Usage: fname.ext to check');
|
|
Halt(EXIT_NOERROR);
|
|
end;
|
|
|
|
{ Program to demonstrate the TDosStream object. }
|
|
|
|
|
|
Const S : String = '0123456789';
|
|
P : Pchar = '9876543210';
|
|
|
|
Var Stream : TDosStream;
|
|
Buf : String;
|
|
L : word;
|
|
f : file;
|
|
|
|
begin
|
|
StreamError:= @StreamErrorProcedure;
|
|
Writeln ('Writing to stream : "01234567899876543210"');
|
|
Stream.Init('testobj.tmp',stCreate);
|
|
Stream.WriteStr (@S);
|
|
Stream.StrWrite (P);
|
|
Writeln ('Closing stream.');
|
|
Stream.Done;
|
|
Writeln ('Reading from stream : ');
|
|
Stream.Init('testobj.tmp',StOpenRead);
|
|
WriteLn('After opening');
|
|
Writeln ('Reading (',S,') : ',Stream.ReadStr^);
|
|
Writeln ('Reading (',P,') : ',Stream.StrRead);
|
|
Writeln ('Closing stream.');
|
|
Stream.Done;
|
|
Writeln ('Same thing, using raw read method : ');
|
|
Writeln ('Reading from stream : ');
|
|
Stream.Init('testobj.tmp',StOpenRead);
|
|
Stream.Read (Buf,11);
|
|
Writeln ('Reading (',S,') : ',Buf);
|
|
Stream.Read (L,2);
|
|
Stream.Read (Buf[1],L);
|
|
Buf[0]:=chr(L);
|
|
Writeln ('Reading (',P,') : ',Buf);
|
|
Writeln ('Closing stream.');
|
|
Stream.Done;
|
|
Writeln ('Statistics about stream : ');
|
|
Stream.Init('testobj.tmp',StOpenRead);
|
|
Writeln ('Size : ',Stream.GetSize);
|
|
Writeln ('Position : ',Stream.GetPos);
|
|
Writeln ('Reading (',S,') : ',Stream.ReadStr^);
|
|
L:=Stream.GetPos;
|
|
Writeln ('Position : ',L);
|
|
Writeln ('Closing stream.');
|
|
Stream.Done;
|
|
Writeln ('Reading from stream : ');
|
|
Stream.Init('testobj.tmp',StOpenRead);
|
|
Writeln ('Seek to position :',L);
|
|
Stream.Seek(L);
|
|
Writeln ('Reading (',P,') : ',Stream.StrRead);
|
|
Writeln ('Closing stream.');
|
|
Stream.Done;
|
|
Writeln ('Truncating stream to zero length.');
|
|
Stream.Init('testobj.tmp',StOpenWrite);
|
|
Stream.Truncate;
|
|
Stream.Done;
|
|
Assign(f,'testobj.tmp');
|
|
Erase(f);
|
|
end.
|