C++ FileName::changeExtension方法代码示例

bool GuiLog::initialiseParams(string const & data)
{
	istringstream is(data);
	Lexer lex;
	lex.setStream(is);

	string logtype, logfile;
	lex >> logtype;
	if (lex) {
		lex.next(true);
		logfile = lex.getString();
	}
	if (!lex)
		// Parsing of the data failed.
		return false;

	logTypeCO->setEnabled(logtype == "latex");
	logTypeCO->clear();
	
	FileName log(logfile);
	
	if (logtype == "latex") {
		type_ = LatexLog;
		logTypeCO->addItem(qt_("LaTeX"), toqstr(logtype));
		FileName tmp = log;
		tmp.changeExtension("blg");
		if (tmp.exists())
			logTypeCO->addItem(qt_("BibTeX"), QString("bibtex"));
		tmp.changeExtension("ilg");
		if (tmp.exists())
			logTypeCO->addItem(qt_("Index"), QString("index"));
	// FIXME: not sure "literate" still works.
	} else if (logtype == "literate") {
		type_ = LiterateLog;
		logTypeCO->addItem(qt_("Literate"), toqstr(logtype));
	} else if (logtype == "lyx2lyx") {
		type_ = Lyx2lyxLog;
		logTypeCO->addItem(qt_("LyX2LyX"), toqstr(logtype));
	} else if (logtype == "vc") {
		type_ = VCLog;
		logTypeCO->addItem(qt_("Version Control"), toqstr(logtype));
	} else
		return false;

	logfile_ = log;

	updateContents();

	return true;
}

//.........这里部分代码省略.........
	// select prefered type if AnyGraphicsType was passed
	if (type == Clipboard::AnyGraphicsType)
		type = types.front();
	
	// which extension?
	map<Clipboard::GraphicsType, string> extensions;
	map<Clipboard::GraphicsType, docstring> typeNames;
	
	extensions[Clipboard::EmfGraphicsType] = "emf";
	extensions[Clipboard::WmfGraphicsType] = "wmf";
	extensions[Clipboard::LinkBackGraphicsType] = "linkback";
	extensions[Clipboard::PdfGraphicsType] = "pdf";
	extensions[Clipboard::PngGraphicsType] = "png";
	extensions[Clipboard::JpegGraphicsType] = "jpeg";
	
	typeNames[Clipboard::EmfGraphicsType] = _("Enhanced Metafile");
	typeNames[Clipboard::WmfGraphicsType] = _("Windows Metafile");
	typeNames[Clipboard::LinkBackGraphicsType] = _("LinkBack PDF");
	typeNames[Clipboard::PdfGraphicsType] = _("PDF");
	typeNames[Clipboard::PngGraphicsType] = _("PNG");
	typeNames[Clipboard::JpegGraphicsType] = _("JPEG");
	
	// find unused filename with primary extension
	string document_path = cur.buffer()->fileName().onlyPath().absFileName();
	unsigned newfile_number = 0;
	FileName filename;
	do {
		++newfile_number;
		filename = FileName(addName(document_path,
			to_utf8(_("pasted"))
			+ convert<string>(newfile_number) + "."
			+ extensions[type]));
	} while (filename.isReadableFile());
	
	while (true) {
		// create file type filter, putting the prefered on to the front
		QStringList filter;
		for (size_t i = 0; i != types.size(); ++i) {
			docstring s = bformat(_("%1$s Files"), typeNames[types[i]])
				+ " (*." + from_ascii(extensions[types[i]]) + ")";
			if (types[i] == type)
				filter.prepend(toqstr(s));
			else
				filter.append(toqstr(s));
		}
		filter = fileFilters(filter.join(";;"));
		
		// show save dialog for the graphic
		FileDialog dlg(qt_("Choose a filename to save the pasted graphic as"));
		FileDialog::Result result =
		dlg.save(toqstr(filename.onlyPath().absFileName()), filter,
			 toqstr(filename.onlyFileName()));
		
		if (result.first == FileDialog::Later)
			return FileName();
		
		string newFilename = fromqstr(result.second);
		if (newFilename.empty()) {
			cur.bv().message(_("Canceled."));
			return FileName();
		}
		filename.set(newFilename);
		
		// check the extension (the user could have changed it)
		if (!suffixIs(ascii_lowercase(filename.absFileName()),
			      "." + extensions[type])) {
			// the user changed the extension. Check if the type is available
			size_t i;
			for (i = 1; i != types.size(); ++i) {
				if (suffixIs(ascii_lowercase(filename.absFileName()),
					     "." + extensions[types[i]])) {
					type = types[i];
					break;
				}
			}
			
			// invalid extension found, or none at all. In the latter
			// case set the default extensions.
			if (i == types.size()
			    && filename.onlyFileName().find('.') == string::npos) {
				filename.changeExtension("." + extensions[type]);
			}
		}
		
		// check whether the file exists and warn the user
		if (!filename.exists())
			break;
		int ret = frontend::Alert::prompt(
			_("Overwrite external file?"),
			bformat(_("File %1$s already exists, do you want to overwrite it?"),
			from_utf8(filename.absFileName())), 1, 1, _("&Overwrite"), _("&Cancel"));
		if (ret == 0)
			// overwrite, hence break the dialog loop
			break;
		
		// not overwrite, hence show the dialog again (i.e. loop)
	}
	
	return filename;
}