我正在创建一个小的Windows边栏小工具,用于在简单的textarea
中记笔记。
像往常一样,我有一个gadget.xml
清单文件和一个.html
文件,见下文。
如何在小工具中读取一些数据/保存一些数据?
我知道这通常不可能只使用JavaScript(注意:使用localstorage
是不可能的,因为我需要持久的数据),所以如何保存/读取里面的数据一个Windows Gadget
?
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=Unicode" />
<title>NeverForget</title>
<style type="text/css">
body
{
margin: 0;
width: 300px;
height: 200px;
background-color: transparent;
}
#gadgetContent
{
width: 100%;
height: 100%;
overflow: hidden;
border: none;
background-color: transparent;
}
</style>
<script type="text/jscript" language="jscript">
function init() {
// how to load notes from a file here on startup?
}
window.onkeydown = function () {
// how to save data to file?
}
</script>
</head>
<body onload="init()">
<textarea id="gadgetContent">Bonjour</textarea>
</body>
</html>
答案 0 :(得分:1)
尝试以下方法之一:
内置的methods of the System.Gadget.Settings object可用于从Settings.ini文件读取/写入(存储在C:\ Users \ [user] \ AppData \ Local \ Microsoft \ Windows Sidebar )但如果关闭或卸载小工具,此信息将会丢失。
使用FileSystemObject在任何地方创建或读取或写入文件夹/文件。限制:文件只能保存为unicode或ascii。
使用ADO Stream object在任何地方创建或读取或写入文件。限制:无法创建文件夹 - 必须与FileSystemObject一起使用。优点:可以使用您计算机上存在的任何代码页。
由于我喜欢使用utf-8保存文本文件,下面的示例使用第三种方法,但您可能决定不使用某些错误处理。 (注意 - 此示例基于script published by Andrew Urquhart)
幸运的是,侧边栏可以使用knownfolders和knownfolderpaths,因此查找文档文件夹的路径就像
一样简单var docs = System.Shell.knownFolderPath("Documents");
请记住,反斜杠是javascript中的转义字符,因此字符串中的路径必须使其反斜杠加倍。
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>NeverForget</title>
<style type="text/css">
<!--
body {margin:0;width:300px;height:200px;background-color:transparent;padding:10px;}
#gadgetContent {width:280px;height:144px;overflow:auto;border:1px solid black;background-color:#eee;}
button {margin-left:66px;margin-top:10px;}
#message {display:none;width:280px;height:180px;position:absolute;top:10px;left:10px;background-color:#eee;border:1px solid red;}
#messageContent {width:278px;height:144px;word-wrap:break-word;overflow-y:auto;}
#newButton {position:absolute;bottom:10px;left:54px;}
-->
</style>
<script type="text/jscript">
//globals
var myFolderPath=System.Shell.knownFolderPath("Documents")+"\\myFiles";
//end globals
function showMessage(msg){
message.style.display="block";
messageContent.innerText=msg;
}
function closeMessage(){
message.style.display="none";
messageContent.innerText="";
}
function loadFile(strAbsoluteFilePath, strCharSet){
var adReadAll=-1, adReadLine=-2, strFileContents="", objStream=new ActiveXObject("ADODB.Stream"), fso=new ActiveXObject("Scripting.FileSystemObject");
try{
if(!strAbsoluteFilePath){
throw new Error(1, "Required parameter \"strAbsoluteFilePath\" was not defined");
}
if(!strCharSet){
throw new Error(2, "Required parameter \"strCharSet\" was not defined");
}
if(!fso.FolderExists(myFolderPath)){
throw new Error(3, "Folder \""+myFolderPath+"\" does not exist");
}
objStream.Open();
try{
objStream.CharSet=strCharSet;
objStream.LoadFromFile(strAbsoluteFilePath);
strFileContents=objStream.ReadText(adReadAll);
gadgetContent.innerText=strFileContents;
}
catch(err){
throw new Error(err.number, "Loading failed:\r\n" + err.description);
}
finally{
objStream.Close(); // Always close the stream regardless of what happens
objStream=null;
fso=null;
}
}
catch(err){
showMessage("Function loadFile() failed with parameters strAbsoluteFilePath=\"" + strAbsoluteFilePath + "\", strCharSet=\"" + strCharSet + "\". Message=\r\n" + err.description+"\r\nError Number: "+err.number);
}
}
function saveFile(strAbsoluteFilePath, strCharSet, strFileContents, blnOverwrite){
var adSaveCreateNotExist=1, adSaveCreateOverWrite=2, objStream = new ActiveXObject("ADODB.Stream"), fso=new ActiveXObject("Scripting.FileSystemObject");
try{
if(!strAbsoluteFilePath){
throw new Error(1, "Required parameter \"strAbsoluteFilePath\" was not defined");
}
if(!strCharSet){
throw new Error(2, "Required parameter \"strCharSet\" was not defined");
}
if(typeof strFileContents != "string"){
throw new Error(3, "Required parameter \"strFileContents\" was not a string");
}
if(!fso.FolderExists(myFolderPath)){
fso.CreateFolder(myFolderPath);
}
objStream.Open();
try{
objStream.CharSet=strCharSet;
objStream.WriteText(strFileContents);
objStream.SaveToFile(strAbsoluteFilePath, (blnOverwrite ? adSaveCreateOverWrite : adSaveCreateNotExist));
return true;
}
catch(err){
throw new Error(err.number, "SaveToFile failed:\r\n" + err.description);
}
finally{
objStream.Close(); // Always close the stream regardless of what happens
objStream=null;
fso=null;
}
return false;
}
catch(err){
showMessage("Function saveFile() failed with parameters strAbsoluteFilePath=\"" + strAbsoluteFilePath + "\", strCharSet=\"" + strCharSet + "\", strFileContents=\"" + strFileContents + "\", blnOverwrite=\"" + blnOverwrite + "\". Message=\r\n" + err.description+"\r\nError Number: "+err.number);
}
}
function init(){
loadButton.onclick=function(){loadFile(myFolderPath+"\\myFile.txt","utf-8");};
saveButton.onclick=function(){saveFile(myFolderPath+"\\myFile.txt", "utf-8", gadgetContent.innerText, true);};
closeButton.onclick=closeMessage;
}
</script>
</head>
<body onload="init()">
<textarea id="gadgetContent">Bonjour</textarea>
<div id="message">
<div id="messageContent"></div>
<div id="newButton"><button id="closeButton">Close</button></div>
</div>
<button id="loadButton">Load</button><button id="saveButton">Save</button>
</body>
</html>