C++ wxStringBuffer函数代码示例

	LogPacket _pop()
	{
		LogPacket ret;

		u32 c_get = m_get;

		const u32& sprefix = *(u32*)&m_buffer[c_get];
		c_get += sizeof(u32);
		if(sprefix) memcpy(wxStringBuffer(ret.m_prefix, sprefix), &m_buffer[c_get], sprefix);
		c_get += sprefix;

		const u32& stext = *(u32*)&m_buffer[c_get];
		c_get += sizeof(u32);
		if(stext) memcpy(wxStringBuffer(ret.m_text, stext), &m_buffer[c_get], stext);
		c_get += stext;

		const u32& scolour = *(u32*)&m_buffer[c_get];
		c_get += sizeof(u32);
		if(scolour) memcpy(wxStringBuffer(ret.m_colour, scolour), &m_buffer[c_get], scolour);
		c_get += scolour;

		m_get = c_get;
		if(!HasNewPacket()) Flush();

		return ret;
	}

bool wxFileDataObject::SetData(size_t WXUNUSED(size),
                               const void *WXUNUSED_IN_WINCE(pData))
{
#ifndef __WXWINCE__
    m_filenames.Empty();

    // the documentation states that the first member of DROPFILES structure is
    // a "DWORD offset of double NUL terminated file list". What they mean by
    // this (I wonder if you see it immediately) is that the list starts at
    // ((char *)&(pDropFiles.pFiles)) + pDropFiles.pFiles. We're also advised
    // to use DragQueryFile to work with this structure, but not told where and
    // how to get HDROP.
    HDROP hdrop = (HDROP)pData;   // NB: it works, but I'm not sure about it

    // get number of files (magic value -1)
    UINT nFiles = ::DragQueryFile(hdrop, (unsigned)-1, NULL, 0u);

    wxCHECK_MSG ( nFiles != (UINT)-1, FALSE, wxT("wrong HDROP handle") );

    // for each file get the length, allocate memory and then get the name
    wxString str;
    UINT len, n;
    for ( n = 0; n < nFiles; n++ ) {
        // +1 for terminating NUL
        len = ::DragQueryFile(hdrop, n, NULL, 0) + 1;

        UINT len2 = ::DragQueryFile(hdrop, n, wxStringBuffer(str, len), len);
        m_filenames.Add(str);

        if ( len2 != len - 1 ) {
            wxLogDebug(wxT("In wxFileDropTarget::OnDrop DragQueryFile returned\
 %d characters, %d expected."), len2, len - 1);
        }
    }

wxString WXDLLEXPORT wxGetWindowClass(WXHWND hWnd)
{
    wxString str;

    if ( hWnd )
    {
        int len = 256; // some starting value

        for ( ;; )
        {
            int count = ::GetClassName((HWND)hWnd, wxStringBuffer(str, len), len);

            if ( count == len )
            {
                // the class name might have been truncated, retry with larger
                // buffer
                len *= 2;
            }
            else
            {
                break;
            }
        }
    }

    return str;
}

bool wxGetEnv(const wxString& WXUNUSED_IN_WINCE(var),
              wxString *WXUNUSED_IN_WINCE(value))
{
#ifdef __WXWINCE__
    // no environment variables under CE
    return false;
#else // Win32
    // first get the size of the buffer
    DWORD dwRet = ::GetEnvironmentVariable(var.t_str(), NULL, 0);
    if ( !dwRet )
    {
        // this means that there is no such variable
        return false;
    }

    if ( value )
    {
        (void)::GetEnvironmentVariable(var.t_str(),
                                       wxStringBuffer(*value, dwRet),
                                       dwRet);
    }

    return true;
#endif // WinCE/32
}

void ReportDialog::OnButtonSave(wxCommandEvent& event)
{
    wxFileDialog dialog
                 (
                    this,
                    wxT("Spara rapport"),
                    wxEmptyString,
                    wxT("TPTest5 rapport.txt"),
                    wxT("Text files (*.txt)|*.txt"),
					wxSAVE | wxOVERWRITE_PROMPT | wxCHANGE_DIR 
				);

	wxString dir;
#ifdef WIN32
	HRESULT result = SHGetFolderPath(NULL, CSIDL_PERSONAL, NULL, SHGFP_TYPE_CURRENT, wxStringBuffer(dir, MAX_PATH));
	if(SUCCEEDED(result)) // or FAILED(result)
	{
			// Do something
	} 
#endif
	dialog.SetDirectory(dir);

    if (dialog.ShowModal() == wxID_OK)
    {
		wxFileOutputStream output( dialog.GetPath() );
		wxTextOutputStream text( output );

		text.WriteString( m_Output->GetValue() );
	}

}

void StringTestCase::StringBuf()
{
    // check that buffer can be used to write into the string
    wxString s;
    wxStrcpy(wxStringBuffer(s, 10), wxT("foo"));

    CPPUNIT_ASSERT_EQUAL(3, s.length());
    CPPUNIT_ASSERT(wxT('f') == s[0u]);
    CPPUNIT_ASSERT(wxT('o') == s[1]);
    CPPUNIT_ASSERT(wxT('o') == s[2]);

    {
        // also check that the buffer initially contains the original string
        // contents
        wxStringBuffer buf(s, 10);
        CPPUNIT_ASSERT_EQUAL( wxT('f'), buf[0] );
        CPPUNIT_ASSERT_EQUAL( wxT('o'), buf[1] );
        CPPUNIT_ASSERT_EQUAL( wxT('o'), buf[2] );
        CPPUNIT_ASSERT_EQUAL( wxT('\0'), buf[3] );
    }

    {
        wxStringBufferLength buf(s, 10);
        CPPUNIT_ASSERT_EQUAL( wxT('f'), buf[0] );
        CPPUNIT_ASSERT_EQUAL( wxT('o'), buf[1] );
        CPPUNIT_ASSERT_EQUAL( wxT('o'), buf[2] );
        CPPUNIT_ASSERT_EQUAL( wxT('\0'), buf[3] );

        // and check that it can be used to write only the specified number of
        // characters to the string
        wxStrcpy(buf, wxT("barrbaz"));
        buf.SetLength(4);
    }

    CPPUNIT_ASSERT_EQUAL(4, s.length());
    CPPUNIT_ASSERT(wxT('b') == s[0u]);
    CPPUNIT_ASSERT(wxT('a') == s[1]);
    CPPUNIT_ASSERT(wxT('r') == s[2]);
    CPPUNIT_ASSERT(wxT('r') == s[3]);

    // check that creating buffer of length smaller than string works, i.e. at
    // least doesn't crash (it would if we naively copied the entire original
    // string contents in the buffer)
    *wxStringBuffer(s, 1) = '!';
}

inline void CrashHandlerSaveEditorFiles(wxString& buf)
{
    wxString path;
    //get the "My Files" folder
    HRESULT result = SHGetFolderPath(NULL, CSIDL_PERSONAL, NULL, 0, wxStringBuffer(path, MAX_PATH));
    if (FAILED(result))
    {   //get at least the profiles folder
        path = ConfigManager::GetHomeFolder();
    }
    path << _T("\\cb-crash-recover");
    if (!wxDirExists(path)) wxMkdir(path);

    //make a sub-directory of the current date & time
    wxDateTime now = wxDateTime::Now();
    path << now.Format(_T("\\%Y%m%d-%H%M%S"));

    EditorManager* em = Manager::Get()->GetEditorManager();
    if (em)
    {
        bool AnyFileSaved = false;
        if (wxMkdir(path) && wxDirExists(path))
        {
            for (int i = 0; i < em->GetEditorsCount(); ++i)
            {
                cbEditor* ed = em->GetBuiltinEditor(em->GetEditor(i));
                if (ed)
                {
                    wxFileName fn(ed->GetFilename());
                    wxString fnpath = path + _T("/") + fn.GetFullName();
                    wxString newfnpath = fnpath;
                    // add number if filename already exists e.g. main.cpp.001, main.cpp.002, ...
                    int j = 1;
                    while (wxFileExists(newfnpath))
                        newfnpath = fnpath + wxString::Format(wxT(".%03d"),j);

                    if (cbSaveToFile(newfnpath,
                                    ed->GetControl()->GetText(),
                                    ed->GetEncoding(),
                                    ed->GetUseBom() ) )
                    {
                        AnyFileSaved = true;
                    }
                }
            }

            if (AnyFileSaved)
            {
                buf << _("The currently opened files have been saved to the directory\n");
                buf << path;
                buf << _("\nHopefully, this will prevent you from losing recent modifications.\n\n");
            }
            else
                wxRmdir(path);
        }
    }
}

off_t wxUtfFile::Read(wxString &str, off_t nCount)
{
	if (nCount == (off_t) - 1)
		nCount = Length() - Tell();
	if (!nCount)
		return 0;

	char *buffer = new char[nCount + 4];
	// on some systems, len returned from wxFile::read might not reflect the number of bytes written
	// to the buffer, but the bytes read from file. In case of CR/LF translation, this is not the same.
	memset(buffer, 0, nCount + 4);
	off_t len = wxFile::Read(buffer, nCount);

	if (len >= 0)
	{
		memset(buffer + len, 0, 4);

		if (m_conversion)
		{
			int decr;
			size_t nLen = 0;


			// We are trying 4 times to convert, in case the last utf char
			// was truncated.
			for (decr = 0 ; len > 0 && decr < 4 ; decr++)
			{
				nLen = m_conversion->MB2WC(NULL, buffer, 0);
				if ( nLen != (size_t) - 1 )
					break;
				len--;
				buffer[len] = 0;
			}

			if (nLen == (size_t) - 1)
			{
				if (!m_strFileName.IsEmpty())
				{
					wxLogWarning(_("The file \"%s\" could not be opened because it contains characters that could not be interpreted."), m_strFileName.c_str());
				}
				Seek(decr - nLen, wxFromCurrent);
				return (size_t) - 1;
			}
			if (decr)
				Seek(-decr, wxFromCurrent);

			m_conversion->MB2WC((wchar_t *)(wxChar *)wxStringBuffer(str, nLen + 1), (const char *)buffer, (size_t)(nLen + 1));
		}
		else
			str = (wxChar *)buffer;
	}

	delete[] buffer;
	return len;
}

wxSize wxDatePickerCtrl::DoGetBestSize() const
{
    wxClientDC dc(const_cast<wxDatePickerCtrl *>(this));

    // we can't use FormatDate() here as the CRT doesn't always use the same
    // format as the date picker control
    wxString s;
    for ( int len = 100; ; len *= 2 )
    {
        if ( ::GetDateFormat
               (
                    LOCALE_USER_DEFAULT,    // the control should use the same
                    DATE_SHORTDATE,         // the format used by the control
                    NULL,                   // use current date (we don't care)
                    NULL,                   // no custom format
                    wxStringBuffer(s, len), // output buffer
                    len                     // and its length
               ) )
        {
            // success
            break;
        }

        const DWORD rc = ::GetLastError();
        if ( rc != ERROR_INSUFFICIENT_BUFFER )
        {
            wxLogApiError(wxT("GetDateFormat"), rc);

            // fall back on wxDateTime, what else to do?
            s = wxDateTime::Today().FormatDate();
            break;
        }
    }

    // the best size for the control is bigger than just the string
    // representation of todays date because the control must accommodate any
    // date and while the widths of all digits are usually about the same, the
    // width of the month string varies a lot, so try to account for it
    s += wxT("WW");

    int x, y;
    dc.GetTextExtent(s, &x, &y);

    // account for the drop-down arrow or spin arrows
    x += wxSystemSettings::GetMetric(wxSYS_HSCROLL_ARROW_X);

    // and for the checkbox if we have it
    if ( HasFlag(wxDP_ALLOWNONE) )
        x += 3*GetCharWidth();

    wxSize best(x, EDIT_HEIGHT_FROM_CHAR_HEIGHT(y));
    CacheBestSize(best);
    return best;
}

wxString wxCrashContext::GetExceptionString() const
{
    wxString s;

    #define CASE_EXCEPTION( x ) case EXCEPTION_##x: s = wxT(#x); break

    switch ( code )
    {
        CASE_EXCEPTION(ACCESS_VIOLATION);
        CASE_EXCEPTION(DATATYPE_MISALIGNMENT);
        CASE_EXCEPTION(BREAKPOINT);
        CASE_EXCEPTION(SINGLE_STEP);
        CASE_EXCEPTION(ARRAY_BOUNDS_EXCEEDED);
        CASE_EXCEPTION(FLT_DENORMAL_OPERAND);
        CASE_EXCEPTION(FLT_DIVIDE_BY_ZERO);
        CASE_EXCEPTION(FLT_INEXACT_RESULT);
        CASE_EXCEPTION(FLT_INVALID_OPERATION);
        CASE_EXCEPTION(FLT_OVERFLOW);
        CASE_EXCEPTION(FLT_STACK_CHECK);
        CASE_EXCEPTION(FLT_UNDERFLOW);
        CASE_EXCEPTION(INT_DIVIDE_BY_ZERO);
        CASE_EXCEPTION(INT_OVERFLOW);
        CASE_EXCEPTION(PRIV_INSTRUCTION);
        CASE_EXCEPTION(IN_PAGE_ERROR);
        CASE_EXCEPTION(ILLEGAL_INSTRUCTION);
        CASE_EXCEPTION(NONCONTINUABLE_EXCEPTION);
        CASE_EXCEPTION(STACK_OVERFLOW);
        CASE_EXCEPTION(INVALID_DISPOSITION);
        CASE_EXCEPTION(GUARD_PAGE);
        CASE_EXCEPTION(INVALID_HANDLE);

        default:
            // unknown exception, ask NTDLL for the name
            if ( !::FormatMessage
                    (
                     FORMAT_MESSAGE_IGNORE_INSERTS |
                     FORMAT_MESSAGE_FROM_HMODULE,
                     ::GetModuleHandle(wxT("NTDLL.DLL")),
                     code,
                     0,
                     wxStringBuffer(s, 1024),
                     1024,
                     0
                    ) )
            {
                s.Printf(wxT("UNKNOWN_EXCEPTION(%d)"), code);
            }
    }

    #undef CASE_EXCEPTION

    return s;
}

wxString wxGetFullHostName()
{
    static const size_t hostnameSize = 257;

    wxString buf;
    bool ok = wxGetFullHostName(wxStringBuffer(buf, hostnameSize), hostnameSize);

    if ( !ok )
        buf.Empty();

    return buf;
}

wxString wxGetUserName()
{
    static const int maxUserNameLen = 1024; // FIXME arbitrary number

    wxString buf;
    bool ok = wxGetUserName(wxStringBuffer(buf, maxUserNameLen), maxUserNameLen);

    if ( !ok )
        buf.Empty();

    return buf;
}

wxString WXDLLEXPORT wxGetWindowText(WXHWND hWnd)
{
    wxString str;

    if ( hWnd )
    {
        int len = GetWindowTextLength((HWND)hWnd) + 1;
        ::GetWindowText((HWND)hWnd, wxStringBuffer(str, len), len);
    }

    return str;
}

/// Set File to hash in wxTextCtrl
void
AlcFrame::SetFileToHash()
{
#ifdef __WXMSW__
	wxString browseroot;
	LPITEMIDLIST pidl;
	HRESULT hr = SHGetSpecialFolderLocation(NULL, CSIDL_PERSONAL, &pidl);
	if (SUCCEEDED(hr)) {
		if (!SHGetPathFromIDList(pidl, wxStringBuffer(browseroot, MAX_PATH))) {
			browseroot = wxFileName::GetHomeDir();
		}
	} else {
		browseroot = wxFileName::GetHomeDir();
	}
	if (pidl) {
		LPMALLOC pMalloc;
		SHGetMalloc(&pMalloc);
		if (pMalloc) {
			pMalloc->Free(pidl);
			pMalloc->Release();
		}
	}
#elif defined(__WXMAC__)

	FSRef fsRef;
	wxString browseroot;
	if (FSFindFolder(kUserDomain, kDocumentsFolderType, kCreateFolder, &fsRef) == noErr)
	{
		CFURLRef	urlRef		= CFURLCreateFromFSRef(NULL, &fsRef);
		CFStringRef	cfString	= CFURLCopyFileSystemPath(urlRef, kCFURLPOSIXPathStyle);
		CFRelease(urlRef) ;
		#if wxCHECK_VERSION(2, 9, 0)
			browseroot = wxCFStringRef(cfString).AsString(wxLocale::GetSystemEncoding());
		#else
			browseroot = wxMacCFStringHolder(cfString).AsString(wxLocale::GetSystemEncoding());
		#endif
	} else {
		browseroot = wxFileName::GetHomeDir();
	}

#else
	wxString browseroot = wxFileName::GetHomeDir();
#endif
  const wxString & filename =
    wxFileSelector (_("Select the file you want to compute the eD2k link"),
                    browseroot, wxEmptyString, wxEmptyString, wxT("*.*"),
                    wxFD_OPEN | wxFD_FILE_MUST_EXIST, this);

  if (!filename.empty ())
    {
      m_inputFileTextCtrl->SetValue(filename);
    }
}

wxString wxGetUserId()
{
    static const int maxLoginLen = 256; // FIXME arbitrary number

    wxString buf;
    bool ok = wxGetUserId(wxStringBuffer(buf, maxLoginLen), maxLoginLen);

    if ( !ok )
        buf.Empty();

    return buf;
}