C++ wxZeroMemory函数代码示例

wxOperatingSystemId wxGetOsVersion(int *verMaj, int *verMin)
{
    OSVERSIONINFO info;
    wxZeroMemory(info);

    info.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
    if ( ::GetVersionEx(&info) )
    {
        if (verMaj) *verMaj = info.dwMajorVersion;
        if (verMin) *verMin = info.dwMinorVersion;
    }

#if defined( __WXWINCE__ )
    return wxOS_WINDOWS_CE;
#elif defined( __WXMICROWIN__ )
    return wxOS_WINDOWS_MICRO;
#else
    switch ( info.dwPlatformId )
    {
    case VER_PLATFORM_WIN32_NT:
        return wxOS_WINDOWS_NT;

    case VER_PLATFORM_WIN32_WINDOWS:
        return wxOS_WINDOWS_9X;
    }

    return wxOS_UNKNOWN;
#endif
}

void wxStackFrame::OnGetName()
{
    if ( m_hasName )
        return;

    m_hasName = true;

    // get the name of the function for this stack frame entry
    static const size_t MAX_NAME_LEN = 1024;
    BYTE symbolBuffer[sizeof(SYMBOL_INFO) + MAX_NAME_LEN];
    wxZeroMemory(symbolBuffer);

    PSYMBOL_INFO pSymbol = (PSYMBOL_INFO)symbolBuffer;
    pSymbol->SizeOfStruct = sizeof(SYMBOL_INFO);
    pSymbol->MaxNameLen = MAX_NAME_LEN;

    DWORD64 symDisplacement = 0;
    if ( !wxDbgHelpDLL::SymFromAddr
                        (
                            ::GetCurrentProcess(),
                            GetSymAddr(),
                            &symDisplacement,
                            pSymbol
                        ) )
    {
        wxDbgHelpDLL::LogError(_T("SymFromAddr"));
        return;
    }

    m_name = wxString::FromAscii(pSymbol->Name);
    m_offset = symDisplacement;
}

void wxTopLevelWindowMSW::Init()
{
    m_iconized =
    m_maximizeOnShow = false;

    // Data to save/restore when calling ShowFullScreen
    m_fsStyle = 0;
    m_fsOldWindowStyle = 0;
    m_fsIsMaximized = false;
    m_fsIsShowing = false;

    m_winLastFocused = NULL;

#if defined(__SMARTPHONE__) && defined(__WXWINCE__)
    m_MenuBarHWND = 0;
#endif

#if defined(__SMARTPHONE__) || defined(__POCKETPC__)
    SHACTIVATEINFO* info = new SHACTIVATEINFO;
    wxZeroMemory(*info);
    info->cbSize = sizeof(SHACTIVATEINFO);

    m_activateInfo = (void*) info;
#endif

    m_menuSystem = NULL;
}

/* static */
HWND wxTLWHiddenParentModule::GetHWND()
{
    if ( !ms_hwnd )
    {
        if ( !ms_className )
        {
            static const wxChar *HIDDEN_PARENT_CLASS = wxT("wxTLWHiddenParent");

            WNDCLASS wndclass;
            wxZeroMemory(wndclass);

            wndclass.lpfnWndProc   = DefWindowProc;
            wndclass.hInstance     = wxGetInstance();
            wndclass.lpszClassName = HIDDEN_PARENT_CLASS;

            if ( !::RegisterClass(&wndclass) )
            {
                wxLogLastError(wxT("RegisterClass(\"wxTLWHiddenParent\")"));
            }
            else
            {
                ms_className = HIDDEN_PARENT_CLASS;
            }
        }

        ms_hwnd = ::CreateWindow(ms_className, wxEmptyString, 0, 0, 0, 0, 0, NULL,
                                 (HMENU)NULL, wxGetInstance(), NULL);
        if ( !ms_hwnd )
        {
            wxLogLastError(wxT("CreateWindow(hidden TLW parent)"));
        }
    }

    return ms_hwnd;
}

int wxCheckListBox::DoInsertItems(const wxArrayStringsAdapter & items,
                                  unsigned int pos,
                                  void **clientData, wxClientDataType type)
{
    const unsigned int count = items.GetCount();

    ListView_SetItemCount( GetHwnd(), GetCount() + count );

    int n = wxNOT_FOUND;

    for( unsigned int i = 0; i < count; i++ )
    {
        LVITEM newItem;
        wxZeroMemory(newItem);
        newItem.iItem = pos + i;
        n = ListView_InsertItem( (HWND)GetHWND(), & newItem );
        wxCHECK_MSG( n != -1, -1, wxT("Item not added") );
        SetString( n, items[i] );
        m_itemsClientData.Insert(NULL, n);

        AssignNewItemClientData(n, clientData, i, type);
    }

    return n;
}

/* static */
const wxChar *wxApp::GetRegisteredClassName(const wxChar *name,
                                            int bgBrushCol,
                                            int extraStyles)
{
    const size_t count = gs_regClassesInfo.size();
#if defined(__INTEL_COMPILER) && 1 /* VDM auto patch */
#   pragma ivdep
#   pragma swp
#   pragma unroll
#   pragma prefetch
#   if 0
#       pragma simd noassert
#   endif
#endif /* VDM auto patch */
    for ( size_t n = 0; n < count; n++ )
    {
        if ( gs_regClassesInfo[n].regname == name )
            return gs_regClassesInfo[n].regname.c_str();
    }

    // we need to register this class
    WNDCLASS wndclass;
    wxZeroMemory(wndclass);

    wndclass.lpfnWndProc   = (WNDPROC)wxWndProc;
    wndclass.hInstance     = wxGetInstance();
    wndclass.hCursor       = ::LoadCursor(NULL, IDC_ARROW);
    wndclass.hbrBackground = (HBRUSH)wxUIntToPtr(bgBrushCol + 1);
    wndclass.style         = CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS | extraStyles;


    ClassRegInfo regClass(name);
    wndclass.lpszClassName = regClass.regname.t_str();
    if ( !::RegisterClass(&wndclass) )
    {
        wxLogLastError(wxString::Format(wxT("RegisterClass(%s)"),
                       regClass.regname));
        return NULL;
    }

    wndclass.style &= ~(CS_HREDRAW | CS_VREDRAW);
    wndclass.lpszClassName = regClass.regnameNR.t_str();
    if ( !::RegisterClass(&wndclass) )
    {
        wxLogLastError(wxString::Format(wxT("RegisterClass(%s)"),
                       regClass.regname));
        ::UnregisterClass(regClass.regname.c_str(), wxGetInstance());
        return NULL;
    }

    gs_regClassesInfo.push_back(regClass);

    // take care to return the pointer which will remain valid after the
    // function returns (it could be invalidated later if new elements are
    // added to the vector and it's reallocated but this shouldn't matter as
    // this pointer should be used right now, not stored)
    return gs_regClassesInfo.back().regname.t_str();
}

/* static */
size_t wxDIB::ConvertFromBitmap(BITMAPINFO *pbi, HBITMAP hbmp)
{
    wxASSERT_MSG( hbmp, wxT("invalid bmp can't be converted to DIB") );

    // prepare all the info we need
    BITMAP bm;
    if ( !::GetObject(hbmp, sizeof(bm), &bm) )
    {
        wxLogLastError(wxT("GetObject(bitmap)"));

        return 0;
    }

    // we need a BITMAPINFO anyhow and if we're not given a pointer to it we
    // use this one
    BITMAPINFO bi2;

    const bool wantSizeOnly = pbi == NULL;
    if ( wantSizeOnly )
        pbi = &bi2;

    // just for convenience
    const int h = bm.bmHeight;

    // init the header
    BITMAPINFOHEADER& bi = pbi->bmiHeader;
    wxZeroMemory(bi);
    bi.biSize = sizeof(BITMAPINFOHEADER);
    bi.biWidth = bm.bmWidth;
    bi.biHeight = h;
    bi.biPlanes = 1;
    bi.biBitCount = bm.bmBitsPixel;

    // memory we need for BITMAPINFO only
    DWORD dwLen = bi.biSize + GetNumberOfColours(bm.bmBitsPixel) * sizeof(RGBQUAD);

    // get either just the image size or the image bits
    if ( !::GetDIBits
            (
                ScreenHDC(),                        // the DC to use
                hbmp,                               // the source DDB
                0,                                  // first scan line
                h,                                  // number of lines to copy
                wantSizeOnly ? NULL                 // pointer to the buffer or
                             : (char *)pbi + dwLen, // NULL if we don't have it
                pbi,                                // bitmap header
                DIB_RGB_COLORS                      // or DIB_PAL_COLORS
            ) )
    {
        wxLogLastError(wxT("GetDIBits()"));

        return 0;
    }

    // return the total size
    return dwLen + bi.biSizeImage;
}

// save system data
HRESULT
wxIDataObject::SaveSystemData(FORMATETC *pformatetc,
                                 STGMEDIUM *pmedium,
                                 BOOL fRelease)
{
    if ( pformatetc == NULL || pmedium == NULL )
        return E_INVALIDARG;

    // remove entry if already available
    for ( SystemData::iterator it = m_systemData.begin();
          it != m_systemData.end();
          ++it )
    {
        if ( pformatetc->tymed & (*it)->pformatetc->tymed &&
             pformatetc->dwAspect == (*it)->pformatetc->dwAspect &&
             pformatetc->cfFormat == (*it)->pformatetc->cfFormat )
        {
            delete (*it);
            m_systemData.erase(it);
            break;
        }
    }

    // create new format/medium
    FORMATETC* pnewformatEtc = new FORMATETC;
    STGMEDIUM* pnewmedium = new STGMEDIUM;

    wxZeroMemory(*pnewformatEtc);
    wxZeroMemory(*pnewmedium);

    // copy format
    *pnewformatEtc = *pformatetc;

    // copy or take ownerschip of medium
    if ( fRelease )
        *pnewmedium = *pmedium;
    else
        wxCopyStgMedium(pmedium, pnewmedium);

    // save entry
    m_systemData.push_back(new SystemDataEntry(pnewformatEtc, pnewmedium));

    return S_OK;
}

wxToolkitInfo& wxAppTraits::GetToolkitInfo()
{
    // cache the version info, it's not going to change
    //
    // NB: this is MT-safe, we may use these static vars from different threads
    //     but as they always have the same value it doesn't matter
    static int s_ver = -1,
               s_major = -1,
               s_minor = -1;

    if ( s_ver == -1 )
    {
        OSVERSIONINFO info;
        wxZeroMemory(info);

        s_ver = wxWINDOWS;
        info.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
        if ( ::GetVersionEx(&info) )
        {
            s_major = info.dwMajorVersion;
            s_minor = info.dwMinorVersion;

#ifdef __SMARTPHONE__
            s_ver = wxWINDOWS_SMARTPHONE;
#elif defined(__POCKETPC__)
            s_ver = wxWINDOWS_POCKETPC;
#else
            switch ( info.dwPlatformId )
            {
                case VER_PLATFORM_WIN32s:
                    s_ver = wxWIN32S;
                    break;

                case VER_PLATFORM_WIN32_WINDOWS:
                    s_ver = wxWIN95;
                    break;

                case VER_PLATFORM_WIN32_NT:
                    s_ver = wxWINDOWS_NT;
                    break;
#ifdef __WXWINCE__
                case VER_PLATFORM_WIN32_CE:
                    s_ver = wxWINDOWS_CE;
#endif
            }
#endif
        }
    }

    static wxToolkitInfo info;
    info.versionMajor = s_major;
    info.versionMinor = s_minor;
    info.os = s_ver;
    info.name = _T("wxBase");
    return info;
}

UINT GetMenuState(HMENU hMenu, UINT id, UINT flags)
{
    MENUITEMINFO info;
    wxZeroMemory(info);
    info.cbSize = sizeof(info);
    info.fMask = MIIM_STATE;
    // MF_BYCOMMAND is zero so test MF_BYPOSITION
    if ( !::GetMenuItemInfo(hMenu, id, flags & MF_BYPOSITION ? TRUE : FALSE , & info) )
        wxLogLastError(wxT("GetMenuItemInfo"));
    return info.fState;
}

int wxCheckListBox::DoAppend(const wxString& item)
{
    int n = (int)GetCount();
    LVITEM newItem;
    wxZeroMemory(newItem);
    newItem.iItem = n;
    int ret = ListView_InsertItem( (HWND)GetHWND(), & newItem );
    wxCHECK_MSG( n == ret , -1, _T("Item not added") );
    SetString( ret , item );
    m_itemsClientData.Insert(NULL, ret);
    return ret;
}

int wxScrollBar::GetThumbPosition(void) const
{
    SCROLLINFO scrollInfo;
    wxZeroMemory(scrollInfo);
    scrollInfo.cbSize = sizeof(SCROLLINFO);
    scrollInfo.fMask = SIF_POS;

    if ( !::GetScrollInfo(GetHwnd(), SB_CTL, &scrollInfo) )
    {
        wxLogLastError(wxT("GetScrollInfo"));
    }
    return scrollInfo.nPos;
}

// make the given menu item default
static void SetDefaultMenuItem(HMENU WXUNUSED_IN_WINCE(hmenu),
                               UINT WXUNUSED_IN_WINCE(id))
{
#ifndef __WXWINCE__
    MENUITEMINFO mii;
    wxZeroMemory(mii);
    mii.cbSize = sizeof(MENUITEMINFO);
    mii.fMask = MIIM_STATE;
    mii.fState = MFS_DEFAULT;

    if ( !::SetMenuItemInfo(hmenu, id, FALSE, &mii) )
    {
        wxLogLastError(wxT("SetMenuItemInfo"));
    }
#endif
}

void wxCheckListBox::DoInsertItems(const wxArrayString& items, unsigned int pos)
{
    wxCHECK_RET( IsValidInsert( pos ),
                 wxT("invalid index in wxListBox::InsertItems") );

    for( unsigned int i = 0; i < items.GetCount(); i++ )
    {
        LVITEM newItem;
        wxZeroMemory(newItem);
        newItem.iItem = i+pos;
        int ret = ListView_InsertItem( (HWND)GetHWND(), & newItem );
        wxASSERT_MSG( int(i+pos) == ret , _T("Item not added") );
        SetString( ret , items[i] );
        m_itemsClientData.Insert(NULL, ret);
    }
}

/*
  Creates a hidden window with supplied window proc registering the class for
  it if necesssary (i.e. the first time only). Caller is responsible for
  destroying the window and unregistering the class (note that this must be
  done because wxWidgets may be used as a DLL and so may be loaded/unloaded
  multiple times into/from the same process so we cna't rely on automatic
  Windows class unregistration).

  pclassname is a pointer to a caller stored classname, which must initially be
  NULL. classname is the desired wndclass classname. If function successfully
  registers the class, pclassname will be set to classname.
 */
extern "C" WXDLLIMPEXP_BASE HWND
wxCreateHiddenWindow(LPCTSTR *pclassname, LPCTSTR classname, WNDPROC wndproc)
{
    wxCHECK_MSG( classname && pclassname && wndproc, NULL,
                    _T("NULL parameter in wxCreateHiddenWindow") );

    // register the class fi we need to first
    if ( *pclassname == NULL )
    {
        WNDCLASS wndclass;
        wxZeroMemory(wndclass);

        wndclass.lpfnWndProc   = wndproc;
        wndclass.hInstance     = wxGetInstance();
        wndclass.lpszClassName = classname;

        if ( !::RegisterClass(&wndclass) )
        {
            wxLogLastError(wxT("RegisterClass() in wxCreateHiddenWindow"));

            return NULL;
        }

        *pclassname = classname;
    }

    // next create the window
    HWND hwnd = ::CreateWindow
                  (
                    *pclassname,
                    NULL,
                    0, 0, 0, 0,
                    0,
                    (HWND) NULL,
                    (HMENU)NULL,
                    wxGetInstance(),
                    (LPVOID) NULL
                  );

    if ( !hwnd )
    {
        wxLogLastError(wxT("CreateWindow() in wxCreateHiddenWindow"));
    }

    return hwnd;
}