C++ wxLogLastError函数代码示例

// The wxWindow destructor will take care of deleting the submenus.
wxMenu::~wxMenu()
{
    // we should free Windows resources only if Windows doesn't do it for us
    // which happens if we're attached to a menubar or a submenu of another
    // menu
    if ( m_hMenu && !IsAttached() && !GetParent() )
    {
        if ( !::DestroyMenu(GetHmenu()) )
        {
            wxLogLastError(wxT("DestroyMenu"));
        }
    }

#if wxUSE_ACCEL
    // delete accels
    WX_CLEAR_ARRAY(m_accels);
#endif // wxUSE_ACCEL

    delete m_radioData;
}

void wxMenuItem::Enable(bool enable)
{
    if ( m_isEnabled == enable )
        return;

    if ( m_parentMenu )
    {
        long rc = EnableMenuItem(GetHMenuOf(m_parentMenu),
                                 GetMSWId(),
                                 MF_BYCOMMAND |
                                 (enable ? MF_ENABLED : MF_GRAYED));

        if ( rc == -1 )
        {
            wxLogLastError(wxT("EnableMenuItem"));
        }
    }

    wxMenuItemBase::Enable(enable);
}

// This is used by wxProcess::Activate().
extern
bool wxMSWActivatePID(long pid)
{
    wxFindByPidParams params;
    params.pid = (DWORD)pid;

    if ( ::EnumWindows(wxEnumFindByPidProc, (LPARAM)&params) != 0 )
    {
        // No windows corresponding to this PID were found.
        return false;
    }

    if ( !::BringWindowToTop(params.hwnd) )
    {
        wxLogLastError(wxS("BringWindowToTop"));
        return false;
    }

    return true;
}

bool wxSpinCtrl::Reparent(wxWindowBase *newParent)
{
    // Reparenting both the updown control and its buddy does not seem to work:
    // they continue to be connected somehow, but visually there is no feedback
    // on the buddy edit control. To avoid this problem, we reparent the buddy
    // window normally, but we recreate the updown control and reassign its
    // buddy.

    if ( !wxWindowBase::Reparent(newParent) )
        return false;

    newParent->GetChildren().DeleteObject(this);

    // preserve the old values
    const wxSize size = GetSize();
    int value = GetValue();
    const wxRect btnRect = wxRectFromRECT(wxGetWindowRect(GetHwnd()));

    // destroy the old spin button
    UnsubclassWin();
    if ( !::DestroyWindow(GetHwnd()) )
    {
        wxLogLastError(wxT("DestroyWindow"));
    }

    // create and initialize the new one
    if ( !wxSpinButton::Create(GetParent(), GetId(),
                               btnRect.GetPosition(), btnRect.GetSize(),
                               GetWindowStyle(), GetName()) )
        return false;

    SetValue(value);
    SetRange(m_min, m_max);
    SetInitialSize(size);

    // associate it with the buddy control again
    ::SetParent(GetBuddyHwnd(), GetHwndOf(GetParent()));
    (void)::SendMessage(GetHwnd(), UDM_SETBUDDY, (WPARAM)GetBuddyHwnd(), 0);

    return true;
}

wxGLContext::wxGLContext(wxGLCanvas *win, const wxGLContext* other)
{
    if ( s_wglContextAttribs[0] == 0 ) // create legacy context
    {
        m_glContext = wglCreateContext(win->GetHDC());
        wxCHECK_RET( m_glContext, wxT("Couldn't create OpenGL context") );
    }
    else // create a context using attributes
    {
        // We need to create a temporary context to get the
        // wglCreateContextAttribsARB function
        HGLRC tempContext = wglCreateContext(win->GetHDC());
        wxCHECK_RET( tempContext, wxT("Couldn't create OpenGL context") );

        wglMakeCurrent(win->GetHDC(), tempContext);
        PFNWGLCREATECONTEXTATTRIBSARBPROC wglCreateContextAttribsARB
            = (PFNWGLCREATECONTEXTATTRIBSARBPROC)
            wglGetProcAddress("wglCreateContextAttribsARB");
        wglMakeCurrent(win->GetHDC(), NULL);
        wglDeleteContext(tempContext);

        if ( !wglCreateContextAttribsARB )
        {
            wxLogError(_("Core OpenGL profile is not supported by the OpenGL driver."));
            return;
        }

        m_glContext = wglCreateContextAttribsARB(
            win->GetHDC(), 0, s_wglContextAttribs);
        wxCHECK_RET( m_glContext,
                     wxT("Couldn't create core profile OpenGL context") );
    }

    if ( other )
    {
        if ( !wglShareLists(other->m_glContext, m_glContext) )
        {
            wxLogLastError(wxT("wglShareLists"));
        }
    }
}

wxMenu* wxMenuBar::Replace(
  size_t                             nPos
, wxMenu*                            pMenu
, const wxString&                    rTitle
)
{
    SHORT                            nId;
    wxString                         sTitle = wxPMTextToLabel(rTitle);
    wxMenu*                          pMenuOld = wxMenuBarBase::Replace( nPos
                                                                       ,pMenu
                                                                       ,sTitle
                                                                      );


    nId = SHORT1FROMMR(::WinSendMsg((HWND)m_hMenu, MM_ITEMIDFROMPOSITION, MPFROMSHORT(nPos), (MPARAM)0));
    if (nId == MIT_ERROR)
    {
        wxLogLastError(wxT("LogLastError"));
        return NULL;
    }
    if (!pMenuOld)
        return NULL;
    m_titles[nPos] = sTitle;
    if (IsAttached())
    {
        ::WinSendMsg((HWND)m_hMenu, MM_REMOVEITEM, MPFROM2SHORT(nId, TRUE), (MPARAM)0);
        ::WinSendMsg((HWND)m_hMenu, MM_INSERTITEM, (MPARAM)&pMenu->m_vMenuData, (MPARAM)sTitle.wx_str());

#if wxUSE_ACCEL
        if (pMenuOld->HasAccels() || pMenu->HasAccels())
        {
            //
            // Need to rebuild accell table
            //
            RebuildAccelTable();
        }
#endif // wxUSE_ACCEL
        Refresh();
    }
    return pMenuOld;
} // end of wxMenuBar::Replace

void wxMemoryDC::SelectObject(const wxBitmap& bitmap)
{
    // select old bitmap out of the device context
    if ( m_oldBitmap )
    {
        ::SelectObject(GetHdc(), (HBITMAP) m_oldBitmap);
        if ( m_selectedBitmap.Ok() )
        {
#ifdef __WXDEBUG__
            m_selectedBitmap.SetSelectedInto(NULL);
#endif
            m_selectedBitmap = wxNullBitmap;
        }
    }

    // check for whether the bitmap is already selected into a device context
    wxASSERT_MSG( !bitmap.GetSelectedInto() ||
                  (bitmap.GetSelectedInto() == this),
                  wxT("Bitmap is selected in another wxMemoryDC, delete the first wxMemoryDC or use SelectObject(NULL)") );

    m_selectedBitmap = bitmap;
    WXHBITMAP hBmp = m_selectedBitmap.GetHBITMAP();
    if ( !hBmp )
        return;

#ifdef __WXDEBUG__
    m_selectedBitmap.SetSelectedInto(this);
#endif
    hBmp = (WXHBITMAP)::SelectObject(GetHdc(), (HBITMAP)hBmp);

    if ( !hBmp )
    {
        wxLogLastError(wxT("SelectObject(memDC, bitmap)"));

        wxFAIL_MSG(wxT("Couldn't select a bitmap into wxMemoryDC"));
    }
    else if ( !m_oldBitmap )
    {
        m_oldBitmap = hBmp;
    }
}

void wxMenuItem::Enable(bool enable)
{
    if ( m_isEnabled == enable )
        return;

    const int itemPos = MSGetMenuItemPos();
    if ( itemPos != -1 )
    {
        long rc = EnableMenuItem(GetHMenuOf(m_parentMenu),
                                 itemPos,
                                 MF_BYPOSITION |
                                 (enable ? MF_ENABLED : MF_GRAYED));

        if ( rc == -1 )
        {
            wxLogLastError(wxT("EnableMenuItem"));
        }
    }

    wxMenuItemBase::Enable(enable);
}

WXHBRUSH wxNotebook::MSWGetBgBrushForChild(WXHDC hDC, wxWindow *child)
{
    if ( m_hbrBackground )
    {
        // before drawing with the background brush, we need to position it
        // correctly
        RECT rc;
        ::GetWindowRect(GetHwndOf(child), &rc);

        ::MapWindowPoints(NULL, GetHwnd(), (POINT *)&rc, 1);

        if ( !::SetBrushOrgEx((HDC)hDC, -rc.left, -rc.top, NULL) )
        {
            wxLogLastError(wxT("SetBrushOrgEx(notebook bg brush)"));
        }

        return m_hbrBackground;
    }

    return wxNotebookBase::MSWGetBgBrushForChild(hDC, child);
}

//
// The wxWindow destructor will take care of deleting the submenus.
//
wxMenu::~wxMenu()
{
    //
    // We should free PM resources only if PM doesn't do it for us
    // which happens if we're attached to a menubar or a submenu of another
    // menu
    if (!IsAttached() && !GetParent())
    {
        if (!::WinDestroyWindow((HWND)GetHmenu()) )
        {
            wxLogLastError(wxT("WinDestroyWindow"));
        }
    }

#if wxUSE_ACCEL
    //
    // Delete accels
    //
    WX_CLEAR_ARRAY(m_vAccels);
#endif // wxUSE_ACCEL
} // end of wxMenu::~wxMenu

wxString wxChoice::GetString(unsigned int n) const
{
    int len = (int)::SendMessage(GetHwnd(), CB_GETLBTEXTLEN, n, 0);

    wxString str;
    if ( len != CB_ERR && len > 0 )
    {
        if ( ::SendMessage
               (
                GetHwnd(),
                CB_GETLBTEXT,
                n,
                (LPARAM)(wxChar *)wxStringBuffer(str, len)
               ) == CB_ERR )
        {
            wxLogLastError(wxT("SendMessage(CB_GETLBTEXT)"));
        }
    }

    return str;
}

wxSemaError wxSemaphoreInternal::Post()
{
#if !defined(_WIN32_WCE) || (_WIN32_WCE >= 300)
    if ( !::ReleaseSemaphore(m_semaphore, 1, NULL /* ptr to previous count */) )
    {
        if ( GetLastError() == ERROR_TOO_MANY_POSTS )
        {
            return wxSEMA_OVERFLOW;
        }
        else
        {
            wxLogLastError(wxT("ReleaseSemaphore"));
            return wxSEMA_MISC_ERROR;
        }
    }

    return wxSEMA_NO_ERROR;
#else
    return wxSEMA_MISC_ERROR;
#endif
}

bool gcTaskBarIcon::RemoveIcon()
{
#ifdef WIN32
	if (!m_iconAdded)
		return false;

	m_iconAdded = false;

	NotifyIconData notifyData(GetHwndOf(m_win));

	bool ok = wxShellNotifyIcon(NIM_DELETE, &notifyData) != 0;
	if ( !ok )
	{
		wxLogLastError(wxT("wxShellNotifyIcon(NIM_DELETE)"));
	}

	return ok;
#else
	return false;
#endif
}

bool wxMSWEventLoopBase::GetNextMessage(WXMSG* msg)
{
    const BOOL rc = ::GetMessage(msg, NULL, 0, 0);

    if ( rc == 0 )
    {
        // got WM_QUIT
        return false;
    }

    if ( rc == -1 )
    {
        // should never happen, but let's test for it nevertheless
        wxLogLastError(wxT("GetMessage"));

        // still break from the loop
        return false;
    }

    return true;
}

void wxApp::WakeUpIdle()
{
    //
    // Send the top window a dummy message so idle handler processing will
    // start up again.  Doing it this way ensures that the idle handler
    // wakes up in the right thread (see also wxWakeUpMainThread() which does
    // the same for the main app thread only)
    //
    wxWindow*                       pTopWindow = wxTheApp->GetTopWindow();

    if (pTopWindow)
    {
        if ( !::WinPostMsg(GetHwndOf(pTopWindow), WM_NULL, (MPARAM)0, (MPARAM)0))
        {
            //
            // Should never happen
            //
            wxLogLastError(wxT("PostMessage(WM_NULL)"));
        }
    }
} // end of wxWakeUpIdle