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{ *********************************************************************
This file is part of the Free Pascal run time library.
Copyright (c) 2011 by Bart Broersma.
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE
**********************************************************************}
unit win9xwsmanager;
{**********************************************************************
Objective: to provide minimal WideString Upper- and LowerCase
functionality under Win9x systems.
This is achievd by dynamically linking shlwapi.dll functions.
If this fails a fallback mechanism is provided so that at least all
lower ASCII characters in a WideString are Upper/LowerCased
Without this library UTF8UpperCase/UTF8LowerCase will fail
on win9x systems (which makes many Lazarus LCL controls that
handle strings behave wrong).
You can use this unit in your uses clause independent of yout target OS.
No code will be linked in if yout target is not Windows.
On true Unicode Windows (WinCE, WinNT-based) no additional libraries
will be linked in (see: InitWin9xWSManager).
Currently only LowerWideStringProc and UpperWideStringProc are
replaced on win9x.
Possibly other functions might need replacin too.
***********************************************************************}
{$mode objfpc}{$H+}
interface
{$IFDEF WINDOWS}
{ $define DEBUG_WIN9X_WSMANAGER}
uses
Windows, SysUtils;
{$endif WINDOWS}
implementation
{$ifdef WINDOWS}
type
TShlwapiFunc = function(lpsz: LPWSTR; ccLength: DWORD): DWORD; stdcall;
var
CharUpperBuffWrapW: TShlwapifunc = nil;
CharLowerBuffWrapW: TShlwapifunc = nil;
ShlwapiHandle: THandle = 0;
SavedUnicodeStringManager: TUnicodeStringManager;
// Win9x**Simple functions do essentially Upper/LowerCase on
// lower ASCII characters in the string
function Win9xWideUpperSimple(const S: WideString): WideString;
const
diff = Ord('a') - Ord('A');
var
W: WideChar;
i: Integer;
begin
Result := S;
for i := 1 to length(Result) do
begin
W := Result[i];
if (Ord(W) in [Ord(Char('a'))..Ord(Char('z'))]) then
begin
Word(W) := Word(W) - diff;
Result[i] := W;
end;
end;
end;
function Win9xWideLowerSimple(const S: WideString): WideString;
const
diff = Ord('a') - Ord('A');
var
W: WideChar;
i: Integer;
begin
Result := S;
for i := 1 to length(Result) do
begin
W := Result[i];
if (Ord(W) in [Ord(Char('A'))..Ord(Char('Z'))]) then
begin
Word(W) := Word(W) + diff;
Result[i] := W;
end;
end;
end;
function Win9xWideUpper(const S: WideString): WideString;
begin
Result := S;
CharUpperBuffWrapW(PWChar(Result), Length(Result));
end;
function Win9xWideLower(const S: WideString): WideString;
begin
Result := S;
CharLowerBuffWrapW(PWChar(Result), Length(Result));
end;
procedure FreeDll;
begin
{$ifdef DEBUG_WIN9X_WSMANAGER}
if IsConsole then writeln('FreeDLL');
{$endif}
if ShlwapiHandle <> 0 then
begin
FreeLibrary(ShlwapiHandle);
ShlwapiHandle := 0;
end;
end;
procedure InitDll;
var
PU,PL: Pointer;
begin
ShlwapiHandle := LoadLibrary('shlwapi.dll');
if (ShlwapiHandle <> 0) then
begin
//shlwapi functions cannot be loaded by name, only by index!
PU := GetProcAddress(ShlwapiHandle,PChar(44));
if (PU <> nil) then CharUpperBuffWrapW := TShlwapiFunc(PU);
PL := GetProcAddress(ShlwapiHandle,PChar(39));
if (PL <> nil) then CharLowerBuffWrapW := TShlwapiFunc(PL);
{$ifdef DEBUG_WIN9X_WSMANAGER}
{$PUSH}{$HINTS OFF} //suppress hints on Pointer to PtrUInt tyecasting
if IsConsole then
begin
writeln('Successfully loaded shlwapi.dll');
if (PU <> nil) then
writeln('Assigning CharUpperBuffWrapW @: ',HexStr(PtrUInt(PU),2*sizeof(PtrInt)))
else
writeln('Unable to load CharUpperBuffWrapW');
if (PL <> nil) then
writeln('Assigning CharLowerBuffWrapW @: ',HexStr(PtrUInt(PL),2*sizeof(PtrInt)))
else
writeln('Unable to load CharLowerBuffWrapW');
end;
{$POP}
{$endif DEBUG_WIN9X_WSMANAGER}
if (PU = nil) and (PL = nil) then
begin
FreeDLL;
end;
end
else
begin
{$ifdef DEBUG_WIN9X_WSMANAGER}
writeln('Unable to load shlwapi.dll');
{$endif}
end;
end;
procedure InitWin9xWSManager;
var
WS: WideString;
begin
SavedUnicodeStringManager := WideStringManager;
WS := 'abc';
if WideUpperCase(WS) <> 'ABC' then
begin
InitDLL;
if Assigned(CharUpperBuffWrapW) then
begin
WideStringManager.UpperWideStringProc := @Win9xWideUpper;
WS := 'abc';
if WideUpperCase(WS) <> 'ABC' then WideStringManager.UpperWideStringProc := @Win9xWideUpperSimple;
end
else
begin
WideStringManager.UpperWideStringProc := @Win9xWideUpperSimple;
end;
if Assigned(CharLowerBuffWrapW) then
begin
WideStringmanager.LowerWideStringProc := @Win9xWideLower;
WS := 'ABC';
if WideLowerCase(WS) <> 'abc' then WideStringManager.LowerWideStringProc := @Win9xWideLowerSimple;
end
else
begin
WideStringManager.LowerWideStringProc := @Win9xWideLowerSimple;
end;
end;
end;
initialization
InitWin9xWSManager;
finalization
WideStringManager := SavedUnicodeStringManager;
if (ShlwapiHandle <> 0) then FreeDll;
{$endif}
end.
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