//从右至左遇到第一个字符P就将后面字符串截断
function Cut_Tail(p:char;s:string):string;
var
l,i:integer;
begin
l:=length(s);
for i:=l downto 1 do
begin
if s[i]=p then break;
end;
Cut_Tail:=copy(s,1,i);
end;剩下的就不说了,自己改改就能得到后缀名了!
function Cut_Tail(p:char;s:string):string;
var
l,i:integer;
begin
l:=length(s);
for i:=l downto 1 do
begin
if s[i]=p then break;
end;
Cut_Tail:=copy(s,1,i);
end;剩下的就不说了,自己改改就能得到后缀名了!
var
i: Integer;
TempStr: string;
begin
Result := Pos(SearchStr, Str);
if Result = 0 then Exit;
if (Length(Str) > 0) and (Length(SearchStr) > 0) then
begin
for i := Length(Str) + Length(SearchStr) - 1 downto Result do
begin
TempStr := Copy(Str, i, Length(Str));
if Pos(SearchStr, TempStr) > 0 then
begin
Result := i;
break;
end;
end;
end;
end; function LastPos(SubStr, S: string): Integer;
var
Found, Len, Pos: integer;
begin
Pos := Length(S);
Len := Length(SubStr);
Found := 0;
while (Pos > 0) and (Found = 0) do
begin
if Copy(S, Pos, Len) = SubStr then
Found := Pos;
Dec(Pos);
end;
LastPos := Found;
end;
iPos: Integer;
sExt: String;
begin
iPos := LastDelimiter(':\.', sFileName);
sExt := Copy(sFileName, iPos+1, Length(sFileName));
end;
ExtractFileExt();
var
i: Integer;
TempStr: string;
begin
Result := Pos(SearchStr, Str);
if Result = 0 then Exit;
if (Length(SearchStr) > 0) and (Length(Str) > Length(SearchStr)) then
begin
for i := Length(Str) - Length(SearchStr) + 1 downto Result do
begin
TempStr := Copy(Str, i, Length(Str));
if Pos(SearchStr, TempStr) > 0 then
begin
Result := i;
break;
end;
end;
end;
end;