- XMLChildrenFilter iterator

[reactos.git] / reactos / subsys / system / explorer / utility / utility.h

/*
 * Copyright 2003, 2004 Martin Fuchs
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */


 //
 // Explorer clone
 //
 // utility.h
 //
 // Martin Fuchs, 23.07.2003
 //


 // standard windows headers
#define WIN32_LEAN_AND_MEAN
#define WIN32_EXTRA_LEAN
#include <windows.h>

 // Unicode support
#ifdef UNICODE
#define _UNICODE
#endif
#include <tchar.h>

#include <windowsx.h>   // for SelectBrush(), ListBox_SetSel(), SubclassWindow(), ...
#include <commctrl.h>

#ifndef _MSC_VER
#include <objbase.h>
#endif
#include <oleauto.h>    // for VARIANT

#include <malloc.h>             // for alloca()
#include <assert.h>
#include <stdlib.h>             // for _MAX_DIR, ...
#include <stdio.h>              // for sprintf()
#include <time.h>

#ifndef _MAX_PATH
#define _MAX_DRIVE      3
#define _MAX_FNAME      256
#define _MAX_DIR        _MAX_FNAME
#define _MAX_EXT        _MAX_FNAME
#define _MAX_PATH       260
#endif


#ifdef __cplusplus
extern "C" {
#endif


#define for if (0) {} else for

#define COUNTOF(x)      (sizeof(x)/sizeof(x[0]))


#define BUFFER_LEN                              2048


extern void _log_(LPCTSTR txt);

#define LOG(txt) _log_(txt)


#ifdef _MSC_VER
#define LONGLONGARG TEXT("I64")
#else
#define LONGLONGARG TEXT("L")
#endif


#ifndef _tcsrchr
#ifdef UNICODE
#define _tcsrchr wcsrchr
#else
#define _tcsrchr strrchr
#endif
#endif

#ifndef _stprintf
#ifdef UNICODE
#define _stprintf wcsprintf
#else
#define _stprintf sprintf
#endif
#endif

#define U2A(s, d, l) WideCharToMultiByte(CP_ACP, 0, s, -1, d, l, NULL, NULL)
#define U2nA(s, d, l) WideCharToMultiByte(CP_ACP, 0, s, l, d, l, NULL, NULL)
#define A2U(s, d, l) MultiByteToWideChar(CP_ACP, 0, s, -1, d, l)
#define A2nU(s, d, l) MultiByteToWideChar(CP_ACP, 0, s, l, d, l)


#ifdef __WINE__
#ifdef UNICODE
extern void _wsplitpath(const WCHAR* path, WCHAR* drv, WCHAR* dir, WCHAR* name, WCHAR* ext);
#else
extern void _splitpath(const CHAR* path, CHAR* drv, CHAR* dir, CHAR* name, CHAR* ext);
#endif
#define _tcsnicmp strncasecmp
#define _tcsicoll strcasecmp
#endif

#ifndef FILE_ATTRIBUTE_NOT_CONTENT_INDEXED
#define FILE_ATTRIBUTE_ENCRYPTED            0x00000040
#define FILE_ATTRIBUTE_SPARSE_FILE          0x00000200
#define FILE_ATTRIBUTE_REPARSE_POINT        0x00000400
#define FILE_ATTRIBUTE_NOT_CONTENT_INDEXED  0x00002000
#endif


#define SetDlgCtrlID(hwnd, id) SetWindowLong(hwnd, GWL_ID, id)
#define SetWindowStyle(hwnd, val) (DWORD)SetWindowLong(hwnd, GWL_STYLE, val)
#define SetWindowExStyle(h, val) (DWORD)SetWindowLong(hwnd, GWL_EXSTYLE, val)
#define Window_SetIcon(hwnd, type, hicon) (HICON)SendMessage(hwnd, WM_SETICON, type, (LPARAM)(hicon))


 // center window in respect to its parent window
extern void CenterWindow(HWND hwnd);

 // move window into visibility
extern void MoveVisible(HWND hwnd);

 // display error message
extern void display_error(HWND hwnd, DWORD error);

 // convert time_t to WIN32 FILETIME
extern BOOL time_to_filetime(const time_t* t, FILETIME* ftime);

 // search for windows of a specific classname
extern int find_window_class(LPCTSTR classname);

 // create a directory with all missing parent directories
BOOL RecursiveCreateDirectory(LPCTSTR path_in);


#ifdef __cplusplus
} // extern "C"
#endif


#ifdef __cplusplus

#ifdef _MSC_VER
#pragma warning(disable: 4786)  // disable warnings about too long debug information symbols
#endif

 // STL headers for strings and streams
#include <string>
#include <iostream>
using namespace std;

 // containers
#include <map>
#include <set>
#include <list>
#include <vector>


#if _MSC_VER>=1300      // VS.Net
#define _NO_COMUTIL     //@@
#endif

#if defined(_MSC_VER) && !defined(_NO_COMUTIL)

 // COM utility headers
#include <comdef.h>
using namespace _com_util;

#endif  // _MSC_VER && !_NO_COMUTIL


 // launch a program or document file
extern BOOL launch_file(HWND hwnd, LPCTSTR cmd, UINT nCmdShow, LPCTSTR parameters=NULL);
#ifdef UNICODE
extern BOOL launch_fileA(HWND hwnd, LPSTR cmd, UINT nCmdShow, LPCSTR parameters=NULL);
#else
#define launch_fileA launch_file
#endif

 // call an DLL export like rundll32
extern BOOL RunDLL(HWND hwnd, LPCTSTR dllname, LPCSTR procname, LPCTSTR cmdline, UINT nCmdShow);

 // launch control panel applet
extern BOOL launch_cpanel(HWND hwnd, LPCTSTR applet);


 /// initialization of windows common controls
struct CommonControlInit
{
        CommonControlInit(DWORD flags=ICC_LISTVIEW_CLASSES|ICC_TREEVIEW_CLASSES|ICC_BAR_CLASSES|ICC_PROGRESS_CLASS|ICC_COOL_CLASSES)
        {
                INITCOMMONCONTROLSEX icc = {sizeof(INITCOMMONCONTROLSEX), flags};

                InitCommonControlsEx(&icc);
        }
};


 /// wait cursor

struct WaitCursor       ///@todo integrate with WM_SETCURSOR to enable multithreaded background tasks as program launching
{
        WaitCursor()
        {
                _old_cursor = SetCursor(LoadCursor(0, IDC_WAIT));
        }

        ~WaitCursor()
        {
                SetCursor(_old_cursor);
        }

protected:
        HCURSOR _old_cursor;
};


 /// base of all structures storing a window handle
struct WindowHandle
{
        WindowHandle(HWND hwnd=0)
         :      _hwnd(hwnd) {}

        operator HWND() const {return _hwnd;}
        HWND* operator&() {return &_hwnd;}

protected:
        HWND    _hwnd;
};


 /// locally hide a window
struct HiddenWindow : public WindowHandle
{
        HiddenWindow(HWND hwnd)
         :      WindowHandle(hwnd)
        {
                SetWindowPos(hwnd, 0, 0, 0, 0, 0, SWP_HIDEWINDOW|SWP_NOREDRAW|SWP_NOMOVE|SWP_NOSIZE|SWP_NOZORDER);
        }

        ~HiddenWindow()
        {
                SetWindowPos(_hwnd, 0, 0, 0, 0, 0, SWP_SHOWWINDOW|SWP_NOMOVE|SWP_NOSIZE|SWP_NOZORDER);
        }
};


 /// critical section wrapper

struct CritSect : public CRITICAL_SECTION
{
        CritSect()
        {
                InitializeCriticalSection(this);
        }

        ~CritSect()
        {
                DeleteCriticalSection(this);
        }
};


 /// Lock protects a code section utilizing a critical section

struct Lock
{
        Lock(CritSect& crit_sect)
         :      _crit_sect(crit_sect)
        {
                EnterCriticalSection(&crit_sect);
        }

        ~Lock()
        {
                LeaveCriticalSection(&_crit_sect);
        }

protected:
        CritSect&       _crit_sect;
};


 /// Thread base class

struct Thread
{
        Thread()
         :      _alive(false)
        {
                _hThread = INVALID_HANDLE_VALUE;
        }

        virtual ~Thread()
        {
                Stop();

                CloseHandle(_hThread);
        }

        void Start()
        {
                if (!_alive) {
                        _alive = true;
                        _hThread = CreateThread(NULL, 0, ThreadProc, this, 0, NULL);
                }
        }

        void Stop()
        {
                if (_alive) {
                        {
                        Lock lock(_crit_sect);
                        _alive = false;
                        }

                         // wait for finishing
                        WaitForSingleObject(_hThread, INFINITE);
                }
        }

        virtual int Run() = 0;

        bool    is_alive() const {return _alive;}

        CritSect _crit_sect;

protected:
        static DWORD WINAPI ThreadProc(void* para);

        HANDLE  _hThread;
        bool    _alive;
};


 // window utilities

 /// ClientRect retreives the client area rectangle of a window.
struct ClientRect : public RECT
{
        ClientRect(HWND hwnd)
        {
                GetClientRect(hwnd, this);
        }

        operator LPRECT() {return this;}

        POINT& pos() {return *(LPPOINT)this;}
};

 /// ClientRect retreives the window rectangle of a window.
struct WindowRect : public RECT
{
        WindowRect(HWND hwnd)
        {
                GetWindowRect(hwnd, this);
        }

        operator LPRECT() {return this;}

        POINT& pos() {return *(LPPOINT)this;}
};

 /// PointL encapsulates the POINT structure into a C++ object.
struct Point : public POINT
{
        Point(LONG x_, LONG y_)
        {
                x = x_;
                y = y_;
        }

         // constructor for being used in processing WM_MOUSEMOVE, WM_LBUTTONDOWN, ... messages
        Point(LPARAM lparam)
        {
                x = GET_X_LPARAM(lparam);
                y = GET_Y_LPARAM(lparam);
        }

        operator LPPOINT() {return this;}
};


 /// transform coordinates in a RECT from client to screen coordiantes
inline void ClientToScreen(HWND hwnd, RECT* prect)
 {::ClientToScreen(hwnd,(LPPOINT)&prect->left); ::ClientToScreen(hwnd,(LPPOINT)&prect->right);}

 /// transform coordinates in a RECT from screen to client coordiantes
inline void ScreenToClient(HWND hwnd, RECT* prect)
 {::ScreenToClient(hwnd,(LPPOINT)&prect->left); ::ScreenToClient(hwnd,(LPPOINT)&prect->right);}


 /// structure containing information about full screen display of the frame window
struct FullScreenParameters
{
        FullScreenParameters()
         :      _mode(FALSE)
        {
        }

        BOOL    _mode;
        RECT    _orgPos;
        BOOL    _wasZoomed;
};


 // drawing utilities

 /// PaintCanvas is a encapsulation of device contexts managed by BeginPaint()/EndPaint().
struct PaintCanvas : public PAINTSTRUCT
{
        PaintCanvas(HWND hwnd)
         :      _hwnd(hwnd)
        {
                BeginPaint(hwnd, this);
        }

        ~PaintCanvas()
        {
                EndPaint(_hwnd, this);
        }

        operator HDC() const {return hdc;}

protected:
        HWND    _hwnd;
};

 /// Canvas is a encapsulation of device contexts.
struct Canvas
{
        Canvas(HDC hdc) : _hdc(hdc) {}

        operator HDC() {return _hdc;}

protected:
        HDC _hdc;
};

 /// WindowCanvas is a encapsulation of client area device contexts.
struct WindowCanvas : public Canvas
{
        WindowCanvas(HWND hwnd)
         :      Canvas(GetDC(hwnd)), _hwnd(hwnd) {}

        ~WindowCanvas() {ReleaseDC(_hwnd, _hdc);}

protected:
        HWND    _hwnd;
};


 // double buffering classes

 /// Memory Canvas creates and destroys memory devoce contexts.
struct MemCanvas : public Canvas
{
        MemCanvas(HDC hdc=0)
         :      Canvas(CreateCompatibleDC(hdc)) {assert(_hdc);}

        ~MemCanvas() {DeleteDC(_hdc);}
};

 /// SelectedBitmap is used to localy select bitmaps into device contexts.
struct SelectedBitmap
{
        SelectedBitmap(HDC hdc, HBITMAP hbmp)
         :      _hdc(hdc), _old_hbmp(SelectBitmap(hdc, hbmp)) {}

        ~SelectedBitmap() {DeleteObject(SelectBitmap(_hdc, _old_hbmp));}

protected:
        HDC             _hdc;
        HBITMAP _old_hbmp;
};

 /// BufferCanvas manages offscreen bitmaps selected into memory device contexts.
struct BufferCanvas : public MemCanvas
{
        BufferCanvas(HDC hdc, int x, int y, int w, int h)
         :      MemCanvas(hdc), _hdctarg(hdc),
                _x(x), _y(y), _w(w), _h(h),
                _bmp(_hdc, CreateCompatibleBitmap(hdc, w, h)) {}

        BufferCanvas(HDC hdc, const RECT& rect)
         :      MemCanvas(hdc), _hdctarg(hdc),
                _x(rect.left), _y(rect.top), _w(rect.right-rect.left), _h(rect.bottom-rect.top),
                _bmp(_hdc, CreateCompatibleBitmap(hdc, _w, _h)) {}

protected:
        HDC     _hdctarg;
        int     _x, _y, _w, _h;
        SelectedBitmap _bmp;
};

 /// BufferedCanvas enables double buffering for a device context.
struct BufferedCanvas : public BufferCanvas
{
        BufferedCanvas(HDC hdc, int x, int y, int w, int h, DWORD mode=SRCCOPY)
         :      BufferCanvas(hdc, x, y, w, h), _mode(mode) {}

        BufferedCanvas(HDC hdc, const RECT& rect, DWORD mode=SRCCOPY)
         :      BufferCanvas(hdc, rect), _mode(mode) {}

        ~BufferedCanvas() {BitBlt(_hdctarg, _x, _y, _w, _h, _hdc, 0, 0, _mode);}

        DWORD   _mode;
};

 /// BufferedPaintCanvas extends PaintCanvas for double buffering.
struct BufferedPaintCanvas : public PaintCanvas, public BufferedCanvas
{
        BufferedPaintCanvas(HWND hwnd)
         :      PaintCanvas(hwnd),
                BufferedCanvas(PAINTSTRUCT::hdc, 0, 0, rcPaint.right, rcPaint.bottom)
        {
        }

        operator HDC() {return BufferedCanvas::_hdc;}
};


 /// TextColor locally selects a text color for drawing.
struct TextColor
{
        TextColor(HDC hdc, COLORREF color)
         : _hdc(hdc), _old_color(SetTextColor(hdc, color)) {}

        ~TextColor() {SetTextColor(_hdc, _old_color);}

protected:
        HDC              _hdc;
        COLORREF _old_color;
};

 /// BkMode locally sets the background mode for drawing.
struct BkMode
{
        BkMode(HDC hdc, int bkmode)
         : _hdc(hdc), _old_bkmode(SetBkMode(hdc, bkmode)) {}

        ~BkMode() {SetBkMode(_hdc, _old_bkmode);}

protected:
        HDC              _hdc;
        COLORREF _old_bkmode;
};

 /// FontSelection locally selects a font for drawing.
struct FontSelection
{
        FontSelection(HDC hdc, HFONT hFont)
         : _hdc(hdc), _old_hFont(SelectFont(hdc, hFont)) {}

        ~FontSelection() {SelectFont(_hdc, _old_hFont);}

protected:
        HDC             _hdc;
        HFONT   _old_hFont;
};

 /// BitmapSelection locally selects a bitmap into a device context.
struct BitmapSelection
{
        BitmapSelection(HDC hdc, HBITMAP hBmp)
         : _hdc(hdc), _old_hBmp(SelectBitmap(hdc, hBmp)) {}

        ~BitmapSelection() {SelectBitmap(_hdc, _old_hBmp);}

protected:
        HDC             _hdc;
        HBITMAP _old_hBmp;
};

 /// BrushSelection locally selects a brush into a device context.
struct BrushSelection
{
        BrushSelection(HDC hdc, HBRUSH hBrush)
         : _hdc(hdc), _old_hBrush(SelectBrush(hdc, hBrush)) {}

        ~BrushSelection() {SelectBrush(_hdc, _old_hBrush);}

protected:
        HDC             _hdc;
        HBRUSH  _old_hBrush;
};


 /// Popup Menus
struct PopupMenu
{
        PopupMenu()
         :      _hmenu(CreatePopupMenu())
        {
        }

        PopupMenu(UINT nid);

        operator HMENU() {return _hmenu;}

        void Append(UINT id, LPCTSTR str, UINT flags=MF_STRING)
        {
                AppendMenu(_hmenu, flags, id, str);
        }

        int TrackPopupMenu(HWND hwnd, const POINT& pt, UINT flags=TPM_LEFTBUTTON|TPM_RIGHTBUTTON, LPTPMPARAMS tpm=NULL) {
         return TrackPopupMenuEx(_hmenu, flags, pt.x, pt.y, hwnd, tpm);
        }

        int PopupContextMenu(HWND hwnd, POINTS pos, UINT flags=TPM_LEFTBUTTON|TPM_RIGHTBUTTON) {
         POINT pt; POINTSTOPOINT(pt, pos);
         return TrackPopupMenuEx(_hmenu, flags, pt.x, pt.y, hwnd, NULL);
        }

        int TrackPopupMenu(HWND hwnd, POINTS pos, UINT flags=TPM_LEFTBUTTON|TPM_RIGHTBUTTON) {
         POINT pt; POINTSTOPOINT(pt, pos);
         ClientToScreen(hwnd, &pt);
         return TrackPopupMenuEx(_hmenu, flags, pt.x, pt.y, hwnd, NULL);
        }

        int TrackPopupMenuAtCursor(HWND hwnd, UINT flags=TPM_LEFTBUTTON) {
         POINT pt; GetCursorPos(&pt);
         return TrackPopupMenuEx(_hmenu, flags, pt.x, pt.y, hwnd, NULL);
        }

        int TrackPopupMenuAtPos(HWND hwnd, DWORD pos, UINT flags=TPM_LEFTBUTTON) {
         return TrackPopupMenuEx(_hmenu, flags, GET_X_LPARAM(pos), GET_Y_LPARAM(pos), hwnd, NULL);
        }

protected:
        HMENU _hmenu;
};


struct Variant : public VARIANT
{
        Variant() {VariantInit(this);}
        Variant(const VARIANT& var);
        Variant(const VARIANT* var);
        ~Variant();

        operator long() const;
        operator bool() const;
        operator VARIANT_BOOL() const;
        operator IDispatch*() const;
};


struct BStr
{
        BStr()
        {
                _p = NULL;
        }

        BStr(const BSTR s)
        {
                _p = SysAllocString(s);
        }

        BStr(LPCSTR s)
        {
                WCHAR b[BUFFER_LEN];

                if (s)
                        _p = SysAllocStringLen(b, MultiByteToWideChar(CP_ACP, 0, s, -1, b, BUFFER_LEN)-1);
                else
                        _p = NULL;
        }

        BStr(LPCWSTR s)
        {
                _p = SysAllocString(s);
        }

        BStr(const VARIANT& var)
         :      _p(NULL)
        {
                assign(var);
        }

        ~BStr()
        {
                SysFreeString(_p);
        }

        void assign(BSTR s);
        void assign(const VARIANT& var);

        operator BSTR() const
        {
                return _p? _p: (BSTR)L"";
        }

        int length() const
        {
                return _p? wcslen(_p): 0;
        }

protected:
        BSTR    _p;
};


 /// string class for TCHAR strings
struct String
#ifdef UNICODE
 : public wstring
#else
 : public string
#endif
{
#ifdef UNICODE
        typedef wstring super;
#else
        typedef string super;
#endif

        String() {}
        String(LPCTSTR s) {if (s) super::assign(s);}
        String(LPCTSTR s, int l) : super(s, l) {}
        String(const super& other) : super(other) {}
        String(const String& other) : super(other) {}

#ifdef UNICODE
        String(LPCSTR s) {assign(s);}
        String(LPCSTR s, int l) {assign(s, l);}
        String(const string& other) {assign(other.c_str());}
        String& operator=(LPCSTR s) {assign(s); return *this;}
        void assign(LPCSTR s) {if (s) {TCHAR b[BUFFER_LEN]; super::assign(b, MultiByteToWideChar(CP_ACP, 0, s, -1, b, BUFFER_LEN)-1);} else erase();}
        void assign(LPCSTR s, int l) {if (s) {TCHAR b[BUFFER_LEN]; super::assign(b, MultiByteToWideChar(CP_ACP, 0, s, l, b, BUFFER_LEN));} else erase();}
        void assign(const BStr& s) {int l = s.length(); super::assign(s, l);}
#else
        String(LPCWSTR s) {assign(s);}
        String(LPCWSTR s, int l) {assign(s, l);}
        String(const wstring& other) {assign(other.c_str());}
        String& operator=(LPCWSTR s) {assign(s); return *this;}
        void assign(LPCWSTR s) {if (s) {char b[BUFFER_LEN]; super::assign(b, WideCharToMultiByte(CP_ACP, 0, s, -1, b, BUFFER_LEN, 0, 0)-1);} else erase();}
        void assign(LPCWSTR s, int l) {if (s) {char b[BUFFER_LEN]; super::assign(b, WideCharToMultiByte(CP_ACP, 0, s, l, b, BUFFER_LEN, 0, 0));} else erase();}
        void assign(const BStr& s) {int l = s.length(); if (l) {char b[BUFFER_LEN]; super::assign(b, WideCharToMultiByte(CP_ACP, 0, s, l, b, BUFFER_LEN, 0, 0));} else erase();}
#endif
        String(const BStr& s) {assign(s);}
        String& operator=(const BStr& s) {assign(s); return *this;}

        String& operator=(LPCTSTR s) {if (s) super::assign(s); else erase(); return *this;}
        String& operator=(const super& s) {super::assign(s); return *this;}
        void assign(LPCTSTR s) {super::assign(s);}
        void assign(LPCTSTR s, int l) {super::assign(s, l);}

        operator LPCTSTR() const {return c_str();}

#ifdef UNICODE
        operator string() const {char b[BUFFER_LEN]; return string(b, WideCharToMultiByte(CP_ACP, 0, c_str(), -1, b, BUFFER_LEN, 0, 0)-1);}
#else
        operator wstring() const {WCHAR b[BUFFER_LEN]; return wstring(b, MultiByteToWideChar(CP_ACP, 0, c_str(), -1, b, BUFFER_LEN)-1);}
#endif

        String& printf(LPCTSTR fmt, ...)
        {
                va_list l;
                TCHAR b[BUFFER_LEN];

                va_start(l, fmt);
                super::assign(b, _vstprintf(b, fmt, l));
                va_end(l);

                return *this;
        }

        String& vprintf(LPCTSTR fmt, va_list l)
        {
                TCHAR b[BUFFER_LEN];

                super::assign(b, _vstprintf(b, fmt, l));

                return *this;
        }

        String& appendf(LPCTSTR fmt, ...)
        {
                va_list l;
                TCHAR b[BUFFER_LEN];

                va_start(l, fmt);
                super::append(b, _vstprintf(b, fmt, l));
                va_end(l);

                return *this;
        }

        String& vappendf(LPCTSTR fmt, va_list l)
        {
                TCHAR b[BUFFER_LEN];

                super::append(b, _vstprintf(b, fmt, l));

                return *this;
        }
};

#define _STRING_DEFINED


struct FmtString : public String
{
        FmtString(LPCTSTR fmt, ...)
        {
                va_list l;

                va_start(l, fmt);
                vprintf(fmt, l);
                va_end(l);
        }
};


#ifdef UNICODE

struct ANS
{
        ANS(LPCWSTR s)
        {
                int l = wcslen(s) + 1;
                _str = (LPSTR) malloc(2*l);

                if (WideCharToMultiByte(CP_ACP, 0, s, -1, _str, 2*l, 0, 0) <= 0)
                        *_str = '\0';
        }

        ~ANS()
        {
                free(_str);
        }

        operator LPCSTR() {return _str;}

protected:
        LPSTR   _str;
};

#define UNC(x) ((LPCWSTR)(x))

#else

#define ANS(x) ((LPCSTR)(x))

struct UNC
{
        UNC(LPCSTR s)
        {
                int l = strlen(s) + 1;
                _str = (LPWSTR) malloc(2*l);

                if (MultiByteToWideChar(CP_ACP, 0, s, -1, _str, l) <= 0)
                        *_str = '\0';
        }

        ~UNC()
        {
                free(_str);
        }

        operator LPCWSTR() {return _str;}

protected:
        LPWSTR  _str;
};

#endif


 /// link dynamicly to functions by using GetModuleHandle() and GetProcAddress()
template<typename FCT> struct DynamicFct
{
        DynamicFct(LPCTSTR moduleName, UINT ordinal)
        {
                HMODULE hModule = GetModuleHandle(moduleName);

                _fct = (FCT) GetProcAddress(hModule, (LPCSTR)ordinal);
        }

        DynamicFct(LPCTSTR moduleName, LPCSTR name)
        {
                HMODULE hModule = GetModuleHandle(moduleName);

                _fct = (FCT) GetProcAddress(hModule, name);
        }

        FCT operator*() const {return _fct;}
        operator bool() const {return _fct? true: false;}

protected:
        FCT     _fct;
};


 /// link dynamicly to functions by using LoadLibrary() and GetProcAddress()
template<typename FCT> struct DynamicLoadLibFct
{
        DynamicLoadLibFct(LPCTSTR moduleName, UINT ordinal)
        {
                _hModule = LoadLibrary(moduleName);

                _fct = (FCT) GetProcAddress(_hModule, (LPCSTR)ordinal);
        }

        DynamicLoadLibFct(LPCTSTR moduleName, LPCSTR name)
        {
                _hModule = LoadLibrary(moduleName);

                _fct = (FCT) GetProcAddress(_hModule, name);
        }

        ~DynamicLoadLibFct()
        {
                FreeLibrary(_hModule);
        }

        FCT operator*() const {return _fct;}
        operator bool() const {return _fct? true: false;}

protected:
        HMODULE _hModule;
        FCT     _fct;
};


struct Context
{
        Context(const char* ctx)
         :      _ctx(ctx)
        {
                _last = s_current;
                s_current = this;
        }

        Context(const char* ctx, LPCSTR obj)
         :      _ctx(ctx),
                _obj(obj)
        {
                _last = s_current;
                s_current = this;
        }

        Context(const char* ctx, LPCWSTR obj)
         :      _ctx(ctx),
                _obj(obj)
        {
                _last = s_current;
                s_current = this;
        }

        Context(const Context& other)
         :      _ctx(other._ctx),
                _obj(other._obj)
        {
                _last = NULL;
        }

        ~Context()
        {
                if (_last) {
                        s_current = _last;
                        _last = NULL;
                }
        }

        String toString() const;
        String getStackTrace() const;

        const char* _ctx;
        String  _obj;

        static Context& current() {return *s_current;}

protected:
        Context* _last;

        static Context* s_current;      ///@todo use TLS
        static Context  s_main;
};

#define CONTEXT_OBJ __ctx__._obj
#define CONTEXT(c) Context __ctx__(c)
#define CURRENT_CONTEXT Context::current()
#define OBJ_CONTEXT(c, o) Context __ctx__(c, o);


#endif // __cplusplus