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| uses
Windows,
SysUtils,
Classes,
Controls,
Graphics,
Messages;
type
TFontLoader = class
private
fHandles : TList;
fMemory : TList;
fCount : integer;
protected
procedure ReleaseAll; virtual;
public
function LoadFontFromFile(const aFileName: string): boolean;
function LoadFontFromFontRes(const aResName: string): boolean;
function LoadFontFromDataRes(const aResName: string): boolean;
public
constructor Create; virtual;
destructor Destroy; override;
end;
{ TFontLoader }
constructor TFontLoader.Create;
begin
fHandles := TList.Create;
fMemory := TList.Create;
end;
destructor TFontLoader.Destroy;
begin
ReleaseAll;
fMemory.Free;
fHandles.Free;
inherited;
end;
function TFontLoader.LoadFontFromFile(const aFileName: string): boolean;
var S : Pointer;
H : THandle;
C : LongWord;
begin
with TFileStream.Create(aFileName, fmOpenRead) do
try
S := AllocMem(Size);
Read(S^, Size);
C := 1;
H := AddFontMemResourceEx(S, Size, nil, @C);
result := H <> INVALID_HANDLE_VALUE;
if result then
begin
fMemory.Add(S);
fHandles.Add(pointer(H));
SendMessage(HWND_BROADCAST, WM_FONTCHANGE, 0, 0);
end
else
FreeMem(S, Size);
finally
Free;
end;
end;
function TFontLoader.LoadFontFromFontRes(const aResName: string): boolean;
var S : Pointer;
H : THandle;
C : LongWord;
begin
with TResourceStream.Create(0, aResName, RT_FONT) do
try
S := AllocMem(Size);
Read(S^, Size);
C := 1;
H := AddFontMemResourceEx(S, Size, nil, @C);
result := H <> INVALID_HANDLE_VALUE;
if result then
begin
fMemory.Add(S);
fHandles.Add(pointer(H));
SendMessage(HWND_BROADCAST, WM_FONTCHANGE, 0, 0);
end
else
FreeMem(S, Size);
finally
Free;
end;
end;
function TFontLoader.LoadFontFromDataRes(const aResName: string): boolean;
var S : Pointer;
H : THandle;
C : LongWord;
begin
with TResourceStream.Create(0, aResName, RT_RCDATA) do
try
S := AllocMem(Size);
Read(S^, Size);
C := 1;
H := AddFontMemResourceEx(S, Size, nil, @C);
result := H <> INVALID_HANDLE_VALUE;
if result then
begin
fMemory.Add(S);
fHandles.Add(pointer(H));
SendMessage(HWND_BROADCAST, WM_FONTCHANGE, 0, 0);
end
else
FreeMem(S, Size);
finally
Free;
end;
end;
procedure TFontLoader.ReleaseAll;
begin
while fHandles.Count > 0 do
begin
RemoveFontMemResourceEx(THandle(fHandles.Items[fHandles.Count - 1]));
fHandles.Delete(fHandles.Count-1);
end;
while fMemory.Count > 0 do
begin
FreeMem(fMemory.Items[fMemory.Count-1]);
fMemory.Delete(fMemory.Count-1);
end;
SendMessage(HWND_BROADCAST, WM_FONTCHANGE, 0, 0);
end; |
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