Contributor: CHRIS LAUTENBACH
{
After looking around through some of my routines, I found a few that were
generic enough that they might be of use to the rest of ya.
My only request is that if you modify them and make them any cooler than
they already are -- send me back a copy. Oh -- yeah -- and if you use
them in your programs give me credit, or at least a registered copy. :)
Here's a brief rundown of these routines:
proc SeqRen - renames a file, keep a certain number of backups.
EG: When you download a file, and one already exists,
it renames them. Only thing is, that this keeps them
in age order. :)
func Filetype - determines the type of a file. Right now, it only
knows about ZIP, ARJ, LHA, EXE and GIF files. If you
can expand on this, feel free - and make sure you
mail me back a copy of the new ones! :)
func FileExistWild - takes a wildcard filename and determines if any files
matching that spec are present. (Eg: *.EXE) The
filename doesn't even have to be a wildcard, so you
could use this as a generic function to see if a file
exists or not.
func SizeFile - takes a filename as input, and if the file exists, it
returns the size of the file. Returns -1 if file
does not exist.
funct SwtVal - returns the value of a command line switch. For
example, on a 'comms' (I hate that) program you might
want to be able to specify an alternate COM: port on
the command line. With this routine you could do that
easily, just check for SwtVal('/COM:'). If the
result is anything other than an empty string, then
that is the value. You can specify multiple words
per command line parameter by replacing the spaces
with underscores ('_').
func StatusBar - You've all seen those programs which display those
nifty progress bars as they do things. Now you can
do it too! Simply call this with the total number of
items (eg: the file size say 10 records for example)
and the current item (eg: record 4 out of 10 records)
and StatusBar will return a demi-hi-res progress bar
as a string. :)
func EraseFiles - Erases all the files in with a filespec matching the
one it is passed. Example: EraseFiles('*.BAK') would
delete all files with the .BAK extension in the
current directory.
}
procedure SeqRen(Fn : string; Max : byte);
{ Sequentially rename file Fn, keeping Max number of files }
var idx, rn : byte;
sfn, efn, ofn : string;
Rend, whole : boolean;
f : file;
function Merge(st:string; ln:longint):string;
var tmp : string;
begin
tmp:=Long2Str(ln);
if length(tmp)>1 then
begin
st[length(st)-1]:=tmp[1];
st[length(st)]:=tmp[2];
end
else
st[length(st)]:=tmp[1];
Merge:=St;
end;
begin
Rend:=false;whole:=false;idx:=0; { Set up variables }
If pos('.',fn)>0 then { Disect the filename }
begin
sfn:=copy(fn,1,pos('.',fn)-1);
efn:=copy(fn,pos('.',fn)+1,length(fn));
end
ELSE
whole:=true;
repeat
Inc(idx);
if not ExistFile(sfn+'.'+Merge(efn, idx)) then rend:=true;
until (idx=max) or Rend;
if (idx=max) and (rend=false) then { Nope? Okay, no problem. }
begin
Assign(f,sfn+'.'+Merge(efn, max)); { Rename all oldies and make }
Erase(f); { room for it as number 1 }
for idx:=(max-1) downto 1 do
begin
Assign(f,sfn+'.'+Merge(efn, idx));
Rename(f,sfn+'.'+Merge(efn, idx+1));
end;
rn:=1;
end;
if rend then rn:=idx;
Assign(f,fn); { Rename the requested file! }
Rename(f,sfn+'.'+Merge(efn, rn));
end;
Type FileIDType = (fEXE, fZIP, fARJ, fLHA, fGIF87);
function FileType(Filename : string) : FileIDType;
{ This function attempts to identify what type of a file Filename is }
var Infile : file;
IdBytes : Array[1..10] of char;
SubId : string;
begin
FileType := fUnknown;
If NOT ExistFile(FileName) then Exit;
Assign(Infile, FileName);
Reset(Infile, 1);
If (FileSize(Infile) = 0) then
begin
Close(Infile);
Exit;
end;
BlockRead(Infile, IDBytes, 10);
Close(Infile);
SubId := Copy(IDBytes, 1, 2);
If (SubID = 'MZ') then FileType := fEXE
ELSE
If (SubID = 'PK') then FileType := fZIP
ELSE
if (SubID = #96 + #234) then FileType := fARJ
ELSE
If (Copy(IDBytes, 3, 5) = '-lh5-') then FileType := fLHA
ELSE
If (Copy(IDBytes, 3, 5) = '-lh1-') then FileType := fLHA
ELSE
if (Copy(IDbytes, 1, 5) = 'GIF89a') then FileType := fGIF87;
end;
function FileExistWild(Mask : string) : boolean; { Does X*.* exist? :) }
var sr : SearchRec;
begin
FindFirst(Mask, AnyFile, SR);
If DosError18 then
FileExistWild := TRUE
ELSE
FileExistWild := FALSE;
end;
Function SizeFile(Fname : string) : longint;
var sr : SearchRec;
idx : integer;
begin
SizeFile := 0;
Findfirst(Fname, Anyfile, SR);
If DosError = 0 then SizeFile := SR.Size ELSE SizeFile := -1;
end;
function SwtVal(Swt : string) : string;
{ Returns the value of a command line switch. Eg: for /COM:2, call
SwtVal('/COM2:') and it will return 2. }
var ndx, found : byte;
st : string;
begin
Found := 0;
For ndx := 1 to ParamCount do
begin
if StUpCase(copy(paramstr(ndx), 1, length(swt))) = StUpCase(swt) then
begin
Found := ndx;
Break;
end;
end;
if (Found = 0) then
begin
swtval := '';
Exit;
end;
st := '';
st := StUpCase(Copy(ParamStr(Found), Length(Swt) + 1,
Length(ParamStr(Found)) - Length(Swt)));
For ndx := 1 to Length(St) do
if (St[ndx] = '_') then St[ndx] := #32;
SwtVal := st;
end;
Function StatusBar(total, amt : longint) : string;
Const BarLength = 40;
var a, b, c, d : longint;
percent : real;
st : string;
begin
If (total = 0) OR (amt = 0) then
begin
StatusBar := '';
Exit;
end;
if (Amt> Total) then amt := total;
Percent := Amt / Total * (Barlength * 10);
a := trunc(percent);
b := a div 10;
c := 1;
percent := amt / total * 100;
d := trunc(percent);
st := ' (' + int_to_str(d) + '%)';
StatusBar := CharStr(b * c, #219) + CharStr(Barlength - (b * c), #176) + st;
end;
function EraseFiles(Path, Mask : string) : integer;
var S : SearchRec;
begin
FindFirst(Path + Mask, Anyfile - Directory, s); { Find the first file }
If (DosError = 18) then exit; { No files to erase }
KillFile(Path + s.name); { Erase the first file }
repeat
Findnext(s); { Find the next file }
If NOT (DOSError=18) then KillFile(Path + s.name); { Erase the file }
until Doserror=18; { no more files }
EraseFiles := IOResult; { Return the IO result }
end;