Импорт большого CSV файла

var s: string; f: TextFile;
 AssignFile(f, 'D:\\INPUT.TXT');
  Reset(f);
  while not EOF(f) do
  begin
  ReadLn(s, f);
  ShowMessage(GetField(s, 1)); {The first field\}
  ShowMessage(GetField(s, 6)); {The sixth field\}
  ShowMessage(GetField(s, 25)); {will return '' if no 25 column...\}
  end;
  CloseFile(f);
{ ==== This function will return a field from a delimited string. ==== \}
function GetField(InpString: string; fieldpos: Integer): string;
var
 c: Char;
 curpos, i: Integer;
begin
 curpos := 1;
 for i := 1 to fieldpos do
  begin
  result := ''; if curpos > Length(InpString) then Break;
  repeat
  c := InpString[curpos]; Inc(curpos, 1);
  if (c = '"') or (c = #13) or (c = #10) then c := ' ';
  if c <> ',' then result := result + c;
  until (c = ',') or (curpos > Length(InpString))
  end;
 if (curpos > Length(InpString)) and (i < fieldpos) then result := '';
 result := Trim(result);
end;
{ ==== This function will trim a string removing spaces etc. ==== \}
function Trim(inp_str: string): string;
var
 i: Integer;
begin
 for i := 1 to Length(inp_str) do
  if inp_str[i] <> ' ' then Break;
 if i > 1 then Delete(inp_str, 1, i - 1);
 for i := Length(inp_str) downto 1 do
  if inp_str[i] <> ' ' then Break;
 if i < Length(inp_str) then Delete(inp_str, i + 1, Length(inp_str));
 result := inp_str;
 if result = ' ' then result := '';
end;


Взято с http://delphiworld.narod.ru

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