public MainForm()
{
this.StartPosition = FormStartPosition.CenterScreen;
FCB root = new FCB("root", FCB.FOLDER, "", 1);
rootNode = new Category.Node(root);
currentRoot = rootNode;
category.root = rootNode;
/*恢复文件管理系统*/
readFormDisk(); //读取目录信息文件
readBitMap(); //读取位图文件
readMyDisk(); //读取虚拟磁盘文件
InitializeComponent();
}
//删除内容
public void delete(string name, int type)
{
if (type == FCB.TXTFILE) //删除文件
{
FCB deleteFCB = category.search(rootNode, name, type).fcb;
category.deleteFile(name);
category.delete(category.search(rootNode, name, FCB.TXTFILE
));
MyDisk.deleteFileContent(deleteFCB.start, deleteFCB.size);
fileFormInit(currentRoot);
}
else //删除文件夹
{
category.deleteFolder(name);
fileFormInit(currentRoot);
}
//目录树更新
treeView.Nodes.Clear();
createTreeView(rootNode.firstChild);
}
//初始化当前结点下的界面
public void fileFormInit(Category.Node now)
{
labelDiskSize.Text = "当前磁盘大小: " + MyDisk.size.ToString() + "B";
labelBlockSize.Text = "当前盘块大小: " + MyDisk.blockSize.ToString() + "B";
if (now.fcb.fileName == "root") //当前目录为root时禁用返回上一层按钮
{
buttonBack.Enabled = false;
}
else
{
buttonBack.Enabled = true;
}
textBoxSearch.Text = nowPath; //更新路径
string name = now.fcb.fileName;
//窗体初始化
this.fileWindow.Init();
//按照左孩子-右兄弟树的结构, 依次显示该目录下的文件夹/文件
if (now.firstChild == null)
{
return;
}
Category.Node temp = new Category.Node();
temp = now.firstChild;
fileWindow.showFiles(temp.fcb.fileName, temp.fcb.lastModify, temp.fcb.type, temp.fcb.size);
temp = temp.nextBrother;
while (temp != null)
{
FCB current = temp.fcb;
fileWindow.showFiles(temp.fcb.fileName, temp.fcb.lastModify, temp.fcb.type, temp.fcb.size);
temp = temp.nextBrother;
}
}
/*
* CategoryInfo.txt中信息格式
*
* 当前目录下的根节点
* 文件名称
* 文件类型
* 上次修改时间
* 文件大小
* 文件起始位置
* #分隔符
*
*/
/*目录信息*/
public void readFormDisk()
{
//把本地保存的上次的结点信息写回来
string path = Application.StartupPath + "\\CategoryInfo.txt";
if (File.Exists(path))
{
StreamReader reader = new StreamReader(path);
string parentName = "", Name = ""; //父结点名字，自己的名字
string lastModify = ""; //最后修改时间
int type = -1, size = 0, start = -1, infoNum = 1;
//逐行读取信息
string str = reader.ReadLine();
while (str != null)
{
switch (infoNum)
{
case 1:
parentName = str;
infoNum++;
break;
case 2:
Name = str;
infoNum++;
break;
case 3:
type = int.Parse(str);
infoNum++;
break;
case 4:
lastModify = str;
infoNum++;
break;
case 5:
size = int.Parse(str);
infoNum++;
break;
case 6:
start = int.Parse(str);
infoNum++;
break;
case 7:
infoNum = 1;
FCB now = new FCB(Name, type, lastModify, size);
category.createFile(parentName, now); //把文件结点的内容加到目录中
break;
default:
break;
}
str = reader.ReadLine();
}
reader.Close();
}
}
/*给文件分配空间并添加内容*/
public bool giveSpace(FCB fcb, string content)
{
int blocks = getBlockSize(fcb.size);
if (blocks <= remain)
{
/*找到该文件开始存放的位置*/
int start = 0;
for (int i = 0; i < blockNum; i++)
{
if (bitMap[i] == EMPTY)
{
remain--;
start = i;
fcb.start = i;
memory[i] = content.Substring(0, blockSize);
break;
}
}
/*从该位置往后开始存放内容*/
for (int j = 1, i = start + 1; j < blocks && i < blockNum; i++)
{
if (bitMap[i] == EMPTY)
{
remain--;
bitMap[start] = i; //以链接的方式存储每位数据
start = i;
if (blocks != 1)
{
if (j != blocks - 1)
{
memory[i] = content.Substring(j * blockSize, blockSize);
}
else
{
bitMap[i] = END; //文件尾
if (fcb.size % blockSize != 0)
{
memory[i] = content.Substring(j * blockSize, content.Length - j * blockSize);
}
else
{
memory[i] = content.Substring(j * blockSize, blockSize);
}
}
}
else
{
memory[i] = content;
}
j++; //找到一个位置
}
}
return(true);
}
else
{
return(false);
}
}
/*更新文件内容*/
public void fileUpdate(int oldStart, int oldSize, FCB newFcb, string newContent)
{
deleteFileContent(oldStart, oldSize); //删除原内容
giveSpace(newFcb, newContent); //开辟新的块并添加内容
}
