Не вызывается OnDrawTab у PageControl в Windows 7x64

unit VCLFixes;
 
interface
 
implementation
 
uses
Messages, Windows, Controls, Dialogs;
 
// WMDrawItem fails under WOW64, see [url]http://qc.codegear.com/wc/qcmain.aspx?d=19859[/url]
 
{$IFDEF VER150} // Delphi7
 
function GetMethodAddress(AMessageID: Word; AClass: TClass; out MethodAddr: Pointer): Boolean;
var
DynamicTableAddress: Pointer;
MethodEntry: ^Pointer;
MessageHandlerList: PWord;
EntryCount, EntryIndex: Word;
begin
Result := False;
 
DynamicTableAddress := Pointer(PInteger(Integer(AClass) + vmtDynamicTable)^);
MessageHandlerList := PWord(DynamicTableAddress);
EntryCount := MessageHandlerList^;
 
if EntryCount > 0 then
for EntryIndex := EntryCount - 1 downto 0 do
begin
Inc(MessageHandlerList);
if (MessageHandlerList^ = AMessageID) then
begin
Inc(MessageHandlerList);
MethodEntry := Pointer(Integer(MessageHandlerList) + 2 * (2 * EntryCount - EntryIndex) - 4);
MethodAddr := MethodEntry^;
Result := True;
end;
end;
end;
 
function PatchInstructionByte(MethodAddress: Pointer; ExpectedOffset: Cardinal;
ExpectedValue: Byte; NewValue: Byte): Boolean;
var
BytePtr: PByte;
OldProtect: Cardinal;
begin
Result := False;
 
BytePtr := PByte(Cardinal(MethodAddress) + ExpectedOffset);
 
if BytePtr^ = NewValue then
begin
Result := True;
Exit;
end;
 
if BytePtr^ <> ExpectedValue then
Exit;
 
if VirtualProtect(BytePtr, SizeOf(BytePtr^), PAGE_EXECUTE_READWRITE, OldProtect) then
begin
try
BytePtr^ := NewValue;
Result := True;
finally
Result := Result
and VirtualProtect(BytePtr, SizeOf(BytePtr^), OldProtect, OldProtect)
and FlushInstructionCache(GetCurrentProcess, BytePtr, SizeOf(BytePtr^));
end;
end;
end;
 
function PatchInstructionBytes(MethodAddress: Pointer; ExpectedOffset: Cardinal;
const ExpectedValues: array of Byte; const NewValues: array of Byte;
const PatchedValues: array of Byte): Boolean;
var
BytePtr, TestPtr: PByte;
OldProtect, Index, PatchSize: Cardinal;
begin
BytePtr := PByte(Cardinal(MethodAddress) + ExpectedOffset);
 
Result := True;
TestPtr := BytePtr;
for Index := Low(PatchedValues) to High(PatchedValues) do
begin
if TestPtr^ <> PatchedValues[Index] then
begin
Result := False;
Break;
end;
Inc(TestPtr);
end;
 
if Result then
Exit;
 
Result := True;
TestPtr := BytePtr;
for Index := Low(ExpectedValues) to High(ExpectedValues) do
begin
if TestPtr^ <> ExpectedValues[Index] then
begin
Result := False;
Exit;
end;
Inc(TestPtr);
end;
 
PatchSize := Length(NewValues) * SizeOf(Byte);
 
if VirtualProtect(BytePtr, PatchSize, PAGE_EXECUTE_READWRITE, OldProtect) then
begin
try
TestPtr := BytePtr;
for Index := Low(NewValues) to High(NewValues) do
begin
TestPtr^ := NewValues[Index];
Inc(TestPtr);
end;
Result := True;
finally
Result := Result
and VirtualProtect(BytePtr, PatchSize, OldProtect, OldProtect)
and FlushInstructionCache(GetCurrentProcess, BytePtr, PatchSize);
end;
end;
end;
 
procedure PatchWinControl;
var
MethodAddress: Pointer;
begin
if not GetMethodAddress(WM_DRAWITEM, TWinControl, MethodAddress) then
begin
ShowMessage('Cannot find WM_DRAWITEM handler in TWinControl');
Exit;
end;
if (not PatchInstructionByte(MethodAddress, 13, $4, $14)) // release and package
and (not PatchInstructionByte(MethodAddress, 23, $4, $14)) then // debug
ShowMessage('Cannot patch WM_DRAWITEM');
 
if not GetMethodAddress(WM_COMPAREITEM, TWinControl, MethodAddress) then
begin
ShowMessage('Cannot find WM_COMPAREITEM handler in TWinControl');
Exit;
end;
if (not PatchInstructionByte(MethodAddress, 13, $04, $8)) // release and package
and (not PatchInstructionByte(MethodAddress, 23, $04, $8)) then // debug
ShowMessage('Cannot patch WM_COMPAREITEM handler');
 
if not GetMethodAddress(WM_DELETEITEM, TWinControl, MethodAddress) then
begin
ShowMessage('Cannot find WM_DELETEITEM handler in TWinControl');
Exit;
end;
if (not PatchInstructionByte(MethodAddress, 13, $04, $0C)) // release and package
and (not PatchInstructionByte(MethodAddress, 23, $04, $0C)) then // debug
ShowMessage('Cannot patch WM_DELETEITEM handler');
 
if not GetMethodAddress(WM_MEASUREITEM, TWinControl, MethodAddress) then
begin
ShowMessage('Cannot find WM_MEASUREITEM handler in TWinControl');
Exit;
end;
if (not PatchInstructionBytes(MethodAddress, 10, [$08, $8B], [$04, $90, $90, $90], [$04, $E8])) // release and package
and (not PatchInstructionBytes(MethodAddress, 20, [$08, $8B], [$04, $90, $90, $90], [$04, $E8])) then // debug
ShowMessage('Cannot patch WM_MEASUREITEM handler');
end;
 
{$ENDIF}
 
// end of "WMDrawItem fails under WOW64" patch
initialization
{$IFDEF VER150} // Delphi7
PatchWinControl; 
{$ENDIF}
 
end.