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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;
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| Категория: ASCII и CSV | Добавил: Skinner (03.07.2008)
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| Просмотров: 747
| Рейтинг: 0.0/0 |
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