Сохранение свойств шрифтов
Материал из DRKB
Сохранение свойств шрифтов[править | править код]
// Saving and restoring font properties in the registry
uses typInfo, Registry;
function GetFontProp(anObj: TObject): TFont;
var
PInfo: PPropInfo;
begin
{ try to get a pointer to the property information for a property with the
name 'Font'. TObject.ClassInfo returns a pointer to the RTTI table,
which we need to pass to GetPropInfo }
PInfo := GetPropInfo(anObj.ClassInfo, 'font');
Result := nil;
if PInfo <> nil then
{ found a property with this name, check if it has the correct type }
if (PInfo^.Proptype^.Kind = tkClass)
and GetTypeData(PInfo^.Proptype^)^.ClassType.InheritsFrom(TFont)
then
Result := TFont(GetOrdProp(anObj, PInfo));
end;
function StyleToString(styles: TFontStyles): string;
var
style: TFontStyle;
begin
Result := '[';
for style := Low(style) To High(style) do
begin
if style in styles then
begin
if Length(Result) > 1 then
Result := Result + ',';
Result := Result + GetEnumname(TypeInfo(TFontStyle), Ord(style));
end;
end;
Result := Result + ']';
end;
function StringToStyle(S: String): TFontStyles;
var
sl: TStringList;
style: TFontStyle;
i: Integer;
begin
Result := [];
if Length(S) < 2 then Exit;
if S[1] = '[' then
Delete(S, 1, 1);
if S[Length(S)] = ']' then
Delete(S, Length(S), 1);
if Length(S) = 0 then Exit;
sl := TStringList.Create;
try
sl.CommaText := S;
for i := 0 to sl.Count-1 do
begin
try
style := TFontStyle(GetEnumValue(TypeInfo(TFontStyle), sl[i]));
Include(Result, style);
except
end;
end;
finally
sl.free
end;
end;
procedure SaveFontProperties(forControl: TControl;
toIni: TRegInifile; const section: string);
var
font: TFont;
basename: String;
begin
Assert(Assigned(toIni));
font := GetFontProp(forControl);
if not Assigned(font) then Exit;
basename := forControl.Name + '.Font.';
toIni.WriteInteger(Section, basename + 'Charset', font.Charset);
toIni.WriteString(Section, basename + 'Name', font.Name );
toIni.WriteInteger(Section, basename + 'Size', font.Size );
toIni.WriteString(Section, basename + 'Color', '$' + IntToHex(font.Color, 8));
toIni.WriteString(Section, basename + 'Style', StyleToString(font.Style));
end;
procedure RestoreFontProperties(forControl: TControl;
toIni: TRegInifile; const section: string);
var
font: TFont;
basename: String;
begin
Assert(Assigned(toIni));
font := GetFontProp(forControl);
if not Assigned(font) then Exit;
basename := forControl.Name + '.Font.';
font.Charset := toIni.ReadInteger(Section, basename + 'Charset', font.Charset);
font.Name := toIni.ReadString(Section, basename + 'Name', font.Name);
font.Size := toIni.ReadInteger(Section, basename + 'Size', font.Size);
font.Color := TColor(StrToInt(toIni.ReadString(Section, basename + 'Color', '$' + IntToHex(font.Color, 8))));
font.Style := StringToStyle(toIni.ReadString(Section, basename + 'Style', StyleToString(font.Style)));
end;
It is also possible to wrap a font into a small component and stream it:
type
TFontWrapper = class(TComponent)
private
FFont: TFont;
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
procedure SetFont(Value: TFont);
published
property Font: TFont read FFont write SetFont;
end;
{ TFontWrapper }
constructor TFontWrapper.Create(AOwner: TComponent);
begin
inherited;
FFont := TFont.Create;
end;
destructor TFontWrapper.Destroy;
begin
FFOnt.Free;
inherited;
end;
procedure TFontWrapper.SetFont(Value: TFont);
begin
FFont.Assign(Value);
end;
procedure TForm1.Button1Click(Sender: TObject);
var
helper: TFontWrapper;
begin
if not Assigned(ms) then
ms := TMemoryStream.Create
else
ms.Clear;
helper := TFontWrapper.Create(nil);
try
helper.Font := Label1.Font;
ms.WriteComponent(helper);
finally
helper.Free;
end;
Label1.Font.Size := Label1.Font.Size + 2;
end;
procedure TForm1.Button2Click(Sender: TObject);
var
helper: TFontWrapper;
begin
if not Assigned(ms) then Exit;
ms.Position := 0;
helper := TFontWrapper.Create(nil);
try
ms.ReadComponent(helper);
Label1.Font := helper.Font;
finally
helper.Free;
end;
end;
ID: 01947
function FontToStr(font: TFont): string;
procedure yes(var str: string);
begin
str := str + 'y';
end;
procedure no(var str: string);
begin
str := str + 'n';
end;
begin
{ кодируем все атрибуты TFont в строку }
Result := '';
Result := Result + IntToStr(font.Color) + '|';
Result := Result + IntToStr(font.Height) + '|';
Result := Result + font.Name + '|';
Result := Result + IntToStr(Ord(font.Pitch)) + '|';
Result := Result + IntToStr(font.PixelsPerInch) + '|';
Result := Result + IntToStr(font.Size) + '|';
if fsBold in font.Style then
yes(Result)
else
no(Result);
if fsItalic in font.Style then
yes(Result)
else
no(Result);
if fsUnderline in font.Style then
yes(Result)
else
no(Result);
if fsStrikeout in font.Style then
yes(Result)
else
no(Result);
end;
procedure StrToFont(str: string; font: TFont);
begin
if str = '' then
Exit;
font.Color := StrToInt(tok('|', str));
font.Height := StrToInt(tok('|', str));
font.Name := tok('|', str);
font.Pitch := TFontPitch(StrToInt(tok('|', str)));
font.PixelsPerInch := StrToInt(tok('|', str));
font.Size := StrToInt(tok('|', str));
font.Style := [];
if str[0] = 'y' then
font.Style := font.Style + [fsBold];
if str[1] = 'y' then
font.Style := font.Style + [fsItalic];
if str[2] = 'y' then
font.Style := font.Style + [fsUnderline];
if str[3] = 'y' then
font.Style := font.Style + [fsStrikeout];
end;
function tok(sep: string; var s: string): string;
function IsOneOf(c, s: string): Boolean;
var
iTmp: integer;
begin
Result := False;
for iTmp := 1 to Length(s) do
begin
if c = Copy(s, iTmp, 1) then
begin
Result := True;
Exit;
end;
end;
end;
var
c, t: string;
begin
if s = '' then
begin
Result := s;
Exit;
end;
c := Copy(s, 1, 1);
while IsOneOf(c, sep) do
begin
s := Copy(s, 2, Length(s) - 1);
c := Copy(s, 1, 1);
end;
t := '';
while (not IsOneOf(c, sep)) and (s <> '') do
begin
t := t + c;
s := Copy(s, 2, Length(s) - 1);
c := Copy(s, 1, 1);
end;
Result := t;
end;
Source: Взято с http://delphiworld.narod.ru
ID: 01948
Нужно сохранять атрибуты шрифта (имя, размер и т.п.) а не сам обьект TFont. После считывания этой информации следует проверить существует ли такой шрифт, прежде чем его использовать. Чтобы не показаться голословным дополню ответ Borland'а своим примером сохранения/чтения шрифта в/из реестра
uses Registry;
procedure SaveFontToRegistry(Font: TFont; SubKey: string);
var
R: TRegistry;
FontStyleInt: byte;
FS: TFontStyles;
begin
R := TRegistry.Create;
try
FS := Font.Style;
Move(FS, FontStyleInt, 1);
R.OpenKey(SubKey, True);
R.WriteString('Font Name', Font.Name);
R.WriteInteger('Color', Font.Color);
R.WriteInteger('CharSet', Font.Charset);
R.WriteInteger('Size', Font.Size);
R.WriteInteger('Style', FontStyleInt);
finally
R.Free;
end;
end;
function ReadFontFromRegistry(Font: TFont; SubKey: string): boolean;
var
R: TRegistry;
FontStyleInt: byte;
FS: TFontStyles;
begin
R := TRegistry.Create;
try
Result := R.OpenKey(SubKey, false);
if not Result then exit;
Font.Name := R.ReadString('Font Name');
Font.Color := R.ReadInteger('Color');
Font.Charset := R.ReadInteger('CharSet');
Font.Size := R.ReadInteger('Size');
FontStyleInt := R.ReadInteger('Style');
Move(FontStyleInt, FS, 1);
Font.Style := FS;
finally
R.Free;
end;
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
if FontDialog1.Execute then
begin
SaveFontToRegistry(FontDialog1.Font, 'Delphi Kingdom\Fonts');
end;
end;
procedure TForm1.Button2Click(Sender: TObject);
var
NFont: TFont;
begin
NFont := TFont.Create;
if ReadFontFromRegistry(NFont, 'Delphi Kingdom\Fonts') then
begin // здесь добавить проверку - существует ли шрифт
Label1.Font.Assign(NFont);
NFont.Free;
end;
end;
ID: 01949