if frDown in FindDialog1.Options then begin FoundAt := RichEdit1.FindText(FindDialog1.FindText, StartPos, ToEnd, [stMatchCase]) end else begin FoundAt := RichEdit1.FindText(FindDialog1.FindText, StartPos, ToEnd, [stMatchCase]) end我这样写并没有作用,RichEdit1.FindText的参数没有选择是否向上或者是 向下的参数,我该怎么写??请指点,谢谢~~~
unit Search; interface uses WinProcs, SysUtils, StdCtrls, Dialogs; const WordDelimiters: set of Char = [#0..#255] - ['a'..'z','A'..'Z','1'..'9','0']; function SearchMemo(Memo: TCustomEdit; const SearchString: String;Options: TFindOptions): Boolean; function SearchBuf(Buf: PChar; BufLen: Integer;SelStart, SelLength: Integer; SearchString: String;Options: TFindOptions): PChar;implementationfunction SearchMemo(Memo: TCustomEdit;const SearchString: String; Options: TFindOptions): Boolean; var Buffer, P: PChar; Size: Word; begin Result := False; if (Length(SearchString) = 0) then Exit; Size := Memo.GetTextLen; if (Size = 0) then Exit; Buffer := StrAlloc(Size + 1); try Memo.GetTextBuf(Buffer, Size + 1); P := SearchBuf(Buffer, Size, Memo.SelStart,Memo.SelLength,SearchString, Options); if P <> nil then begin Memo.SelStart := P - Buffer; Memo.SelLength := Length(SearchString); Result := True; end; finally StrDispose(Buffer); end; end;function SearchBuf(Buf: PChar; BufLen: Integer;SelStart, SelLength: Integer; SearchString: String;Options: TFindOptions): PChar; var SearchCount, I: Integer; C: Char; Direction: Shortint; CharMap: array [Char] of Char;function FindNextWordStart(var BufPtr: PChar): Boolean; begin { (True XOR N) is equivalent to (not N) } // Result := False; { (False XOR N) is equivalent to (N) } { When Direction is forward (1), skip nondelimiters, then skip delimiters. } { When Direction is backward (-1), skip delims, then skip non delims } while (SearchCount > 0) and ((Direction = 1) xor (BufPtr^ in WordDelimiters)) do begin Inc(BufPtr, Direction); Dec(SearchCount); end; while (SearchCount > 0) and ((Direction = -1) xor (BufPtr^ in WordDelimiters)) do begin Inc(BufPtr, Direction); Dec(SearchCount); end; Result := SearchCount > 0; if Direction = -1 then begin { back up one char, to leave ptr on first nondelim } Dec(BufPtr, Direction); Inc(SearchCount); end; end;begin Result := nil; if BufLen <= 0 then Exit; if frDown in Options then begin Direction := 1; Inc(SelStart, SelLength); { start search past end of selection } SearchCount := BufLen - SelStart - Length(SearchString); if SearchCount < 0 then Exit; if Longint(SelStart) + SearchCount > BufLen then Exit; end else begin Direction := -1; Dec(SelStart, Length(SearchString)); SearchCount := SelStart; end; if (SelStart < 0) or (SelStart > BufLen) then Exit; Result := @Buf[SelStart]; { Using a Char map array is faster than calling AnsiUpper on every character } for C := Low(CharMap) to High(CharMap) do CharMap[C] := C; if not (frMatchCase in Options) then begin AnsiUpperBuff(PChar(@CharMap), sizeof(CharMap)); AnsiUpperBuff(@SearchString[1],Length(SearchString)); end; while SearchCount > 0 do begin if frWholeWord in Options then if not FindNextWordStart(Result) then Break; I := 0; while (CharMap[Result[I]] = SearchString[I+1]) do begin Inc(I); if I >= Length(SearchString) then begin if (not (frWholeWord in Options)) or (SearchCount = 0) or (Result[I] in WordDelimiters) then Exit; Break; end; end; Inc(Result, Direction); Dec(SearchCount); end; Result := nil; end;end.
begin
FoundAt := RichEdit1.FindText(FindDialog1.FindText, StartPos,
ToEnd, [stMatchCase])
end
else begin
FoundAt := RichEdit1.FindText(FindDialog1.FindText, StartPos,
ToEnd, [stMatchCase])
end我这样写并没有作用,RichEdit1.FindText的参数没有选择是否向上或者是
向下的参数,我该怎么写??请指点,谢谢~~~
我没有解决,请帮忙~~
interface
uses WinProcs, SysUtils, StdCtrls, Dialogs;
const
WordDelimiters: set of Char = [#0..#255] - ['a'..'z','A'..'Z','1'..'9','0'];
function SearchMemo(Memo: TCustomEdit;
const SearchString: String;Options: TFindOptions): Boolean;
function SearchBuf(Buf: PChar; BufLen: Integer;SelStart, SelLength: Integer;
SearchString: String;Options: TFindOptions): PChar;implementationfunction SearchMemo(Memo: TCustomEdit;const SearchString: String;
Options: TFindOptions): Boolean;
var
Buffer, P: PChar;
Size: Word;
begin
Result := False;
if (Length(SearchString) = 0) then Exit;
Size := Memo.GetTextLen;
if (Size = 0) then Exit;
Buffer := StrAlloc(Size + 1);
try
Memo.GetTextBuf(Buffer, Size + 1);
P := SearchBuf(Buffer, Size, Memo.SelStart,Memo.SelLength,SearchString, Options);
if P <> nil then
begin
Memo.SelStart := P - Buffer;
Memo.SelLength := Length(SearchString);
Result := True;
end;
finally
StrDispose(Buffer);
end;
end;function SearchBuf(Buf: PChar; BufLen: Integer;SelStart, SelLength: Integer;
SearchString: String;Options: TFindOptions): PChar;
var
SearchCount, I: Integer;
C: Char;
Direction: Shortint;
CharMap: array [Char] of Char;function FindNextWordStart(var BufPtr: PChar): Boolean;
begin { (True XOR N) is equivalent to (not N) }
// Result := False; { (False XOR N) is equivalent to (N) }
{ When Direction is forward (1), skip nondelimiters, then skip delimiters. }
{ When Direction is backward (-1), skip delims, then skip non delims }
while (SearchCount > 0) and ((Direction = 1) xor (BufPtr^ in WordDelimiters)) do
begin
Inc(BufPtr, Direction);
Dec(SearchCount);
end;
while (SearchCount > 0) and ((Direction = -1) xor (BufPtr^ in WordDelimiters)) do
begin
Inc(BufPtr, Direction);
Dec(SearchCount);
end;
Result := SearchCount > 0;
if Direction = -1 then
begin { back up one char, to leave ptr on first nondelim }
Dec(BufPtr, Direction);
Inc(SearchCount);
end;
end;begin
Result := nil;
if BufLen <= 0 then Exit;
if frDown in Options then
begin
Direction := 1;
Inc(SelStart, SelLength); { start search past end of selection }
SearchCount := BufLen - SelStart - Length(SearchString);
if SearchCount < 0 then Exit;
if Longint(SelStart) + SearchCount > BufLen then
Exit;
end else
begin
Direction := -1;
Dec(SelStart, Length(SearchString));
SearchCount := SelStart;
end;
if (SelStart < 0) or (SelStart > BufLen) then Exit;
Result := @Buf[SelStart];
{ Using a Char map array is faster than calling AnsiUpper on every character }
for C := Low(CharMap) to High(CharMap) do
CharMap[C] := C;
if not (frMatchCase in Options) then
begin
AnsiUpperBuff(PChar(@CharMap), sizeof(CharMap));
AnsiUpperBuff(@SearchString[1],Length(SearchString));
end;
while SearchCount > 0 do
begin
if frWholeWord in Options then
if not FindNextWordStart(Result) then Break;
I := 0;
while (CharMap[Result[I]] = SearchString[I+1]) do
begin
Inc(I);
if I >= Length(SearchString) then
begin
if (not (frWholeWord in Options)) or (SearchCount = 0) or
(Result[I] in WordDelimiters) then
Exit;
Break;
end;
end;
Inc(Result, Direction);
Dec(SearchCount);
end;
Result := nil;
end;end.