procedure TForm1.Button1Click(Sender: TObject);
var
S: string;
begin
S := '你要查询的字符';
Memo1.SelStart := Pos(S, Memo1.Text);
if Memo1.SelStart > 0 then Memo1.SelLength := Length(S);
Memo1.SetFocus;
end;
var
S: string;
begin
S := '你要查询的字符';
Memo1.SelStart := Pos(S, Memo1.Text);
if Memo1.SelStart > 0 then Memo1.SelLength := Length(S);
Memo1.SetFocus;
end;
首部 function SearchBuf(Buf: PChar; BufLen: Integer; SelStart, SelLength: Integer; SearchString: String; Options: TStringSearchOptions = [soDown]): PChar; $[StrUtils.pas
功能 返回第一个搜索到的指针位置
说明 这函数常用于文本中搜索字符串
参考 <NULL>
例子
///////Begin SearchBuf
function SearchEdit(EditControl: TCustomEdit; const SearchString: String;
SearchOptions: TStringSearchOptions; FindFirst: Boolean = False): Boolean;
var
Buffer, P: PChar;
Size: Word;
begin
Result := False;
if (Length(SearchString) = 0) then Exit;
Size := EditControl.GetTextLen;
if (Size = 0) then Exit;
Buffer := StrAlloc(Size + 1);
try
EditControl.GetTextBuf(Buffer, Size + 1);
P := SearchBuf(Buffer, Size, EditControl.SelStart, EditControl.SelLength,
SearchString, SearchOptions);
if P <> nil then begin
EditControl.SelStart := P - Buffer;
EditControl.SelLength := Length(SearchString);
Result := True;
end;
finally
StrDispose(Buffer);
end;
end;procedure TForm1.Button1Click(Sender: TObject);
var
SearchOptions: TStringSearchOptions;
begin
SearchOptions := [];
if CheckBox1.Checked then
Include(SearchOptions, soDown);
if CheckBox2.Checked then
Include(SearchOptions, soMatchCase);
if CheckBox3.Checked then
Include(SearchOptions, soWholeWord);
SearchEdit(Memo1, Edit1.Text, SearchOptions);
Memo1.SetFocus;
end;
///////End SearchBuf