[C#]DropBox開發系列 - 使用DropNet遍巡DropBox內存放的檔案
認證的開發介紹完了，這邊要介紹一下如何遍巡DropBox內存放的檔案，使用DropNet去實做這個功能也很簡單，只需要透過DropNetClient.GetMetaData這個函式帶入要查閱的路徑就可以了。若是要查閱的是根目錄，可帶入"/"去做查閱，但需注意申請App Key時必需要允許對整個DropBox做控制才可以，不然只能針對該App的目錄下去巡覽。
用DropNetClient.GetMetaData問回來的資料是MetaData型態。DropNet將DropBox內的檔案都視為是MetaData，MetaData內會有檔案名稱、大小、是否是目錄之類的相關資訊。
若MetaData是目錄的話，目錄下的存放的檔案資料會在Contents屬性中，我們只要遞迴去遍巡處理就可以了。但這邊需要特別留意的是，為了速度考量DropNet預設只會抓指定那層的資料，超過指定那層Contents屬性會是Null，因此再往下層處理時記得要再次叫用DropNetClient.GetMetaData。
處理起來會像下面這樣：
...
private void btnLogin_Click(object sender, EventArgs e)
{
if (!String.IsNullOrEmpty(Properties.Settings.Default.SECRET) && !String.IsNullOrEmpty(Properties.Settings.Default.TOKEN))
{
m_DropNetClient.UserLogin = new UserLogin()
{
Secret = Properties.Settings.Default.SECRET,
Token = Properties.Settings.Default.TOKEN
};
FillTreeView();
return;
}
var callbackUrl = "https://www.dropbox.com/1/oauth/authorize";
var cancelCallbackUrl = "https://www.dropbox.com/home";
var size = new Size(1024, 600);
if (DoOAuth(callbackUrl, cancelCallbackUrl, size) == DialogResult.OK)
{
var accessToken = m_DropNetClient.GetAccessToken();
Properties.Settings.Default.SECRET = accessToken.Secret;
Properties.Settings.Default.TOKEN = accessToken.Token;
Properties.Settings.Default.Save();
FillTreeView();
}
}
private void FillTreeView()
{
treeView1.Nodes.Clear();
var metaData = m_DropNetClient.GetMetaData("/");
FillDirOrFileToTreeView(null, metaData);
}
private void FillDirOrFileToTreeView(TreeNode parentNode, MetaData metaData)
{
if (metaData.Contents == null)
return;
var nodes = (parentNode == null) ? treeView1.Nodes : parentNode.Nodes;
try
{
treeView1.BeginUpdate();
foreach (var childMetaData in metaData.Contents)
{
if (childMetaData.Is_Dir)
{
var node = nodes.Add(childMetaData.Name);
node.Tag = childMetaData;
node.Nodes.Add(string.Empty);
}
else
{
nodes.Add(childMetaData.Name).Tag = childMetaData;
}
}
}
finally
{
treeView1.EndUpdate();
}
}
private void treeView1_BeforeExpand(object sender, TreeViewCancelEventArgs e)
{
var node = e.Node;
if (!(node.Nodes.Count == 1 && node.Nodes[0].Tag == null))
return;
node.Nodes.Clear();
FillDirOrFileToTreeView(node, m_DropNetClient.GetMetaData("/" + node.FullPath));
}
...
運行後可以看到我們確實的將整個DropBox內的內容都抓出來了。
筆者在撰寫時為了方便都是以同步的方式下去做說明，實際使用時若有需要可以考慮用非同步的方式叫用，將程式改呼叫GetMetaDataAsync就可以了。
最後一樣附上完整的範例程式碼：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using DropNet;
using DropNetDemo.Properties;
using DropNet.Models;
namespace DropNetDemo
{
public partial class Form1 : Form
{
#region Var
private DropNetClient _dropNetClient;
#endregion
#region Private Property
private DropNetClient m_DropNetClient
{
get
{
return _dropNetClient ?? (_dropNetClient = new DropNetClient(tbxAppKey.Text, tbxAppSecret.Text));
}
set
{
_dropNetClient = value;
}
}
#endregion
public Form1()
{
InitializeComponent();
}
private void SetSecretAndToken(string secret, string token)
{
Settings.Default.SECRET = secret;
Settings.Default.TOKEN = token;
}
private void btnLogin_Click(object sender, EventArgs e)
{
if (!String.IsNullOrEmpty(Properties.Settings.Default.SECRET) && !String.IsNullOrEmpty(Properties.Settings.Default.TOKEN))
{
m_DropNetClient.UserLogin = new UserLogin()
{
Secret = Properties.Settings.Default.SECRET,
Token = Properties.Settings.Default.TOKEN
};
FillTreeView();
return;
}
var callbackUrl = "https://www.dropbox.com/1/oauth/authorize";
var cancelCallbackUrl = "https://www.dropbox.com/home";
var size = new Size(1024, 600);
if (DoOAuth(callbackUrl, cancelCallbackUrl, size) == DialogResult.OK)
{
var accessToken = m_DropNetClient.GetAccessToken();
Properties.Settings.Default.SECRET = accessToken.Secret;
Properties.Settings.Default.TOKEN = accessToken.Token;
Properties.Settings.Default.Save();
FillTreeView();
}
}
private void FillTreeView()
{
treeView1.Nodes.Clear();
var metaData = m_DropNetClient.GetMetaData("/");
FillDirOrFileToTreeView(null, metaData);
}
private void FillDirOrFileToTreeView(TreeNode parentNode, MetaData metaData)
{
if (metaData.Contents == null)
return;
var nodes = (parentNode == null) ? treeView1.Nodes : parentNode.Nodes;
try
{
treeView1.BeginUpdate();
foreach (var childMetaData in metaData.Contents)
{
if (childMetaData.Is_Dir)
{
var node = nodes.Add(childMetaData.Name);
node.Tag = childMetaData;
node.Nodes.Add(string.Empty);
}
else
{
nodes.Add(childMetaData.Name).Tag = childMetaData;
}
}
}
finally
{
treeView1.EndUpdate();
}
}
private void treeView1_BeforeExpand(object sender, TreeViewCancelEventArgs e)
{
var node = e.Node;
if (!(node.Nodes.Count == 1 && node.Nodes[0].Tag == null))
return;
node.Nodes.Clear();
FillDirOrFileToTreeView(node, m_DropNetClient.GetMetaData("/" + node.FullPath));
}
private DialogResult DoOAuth(string callbackUrl, string cancelCallbackUrl, System.Drawing.Size size)
{
using (var dialog = new Form())
{
var browesr = new WebBrowser()
{
Dock = DockStyle.Fill
};
var token = m_DropNetClient.GetToken();
var authUrl = m_DropNetClient.BuildAuthorizeUrl();
browesr.Navigated += (s, ex) =>
{
var url = ex.Url.ToString();
if (url.Equals(callbackUrl))
{
dialog.DialogResult = DialogResult.OK;
}
else if (url.Equals(cancelCallbackUrl))
{
dialog.DialogResult = DialogResult.Cancel;
}
};
browesr.Navigate(authUrl);
dialog.Size = size;
dialog.Controls.Add(browesr);
return dialog.ShowDialog();
}
}
private void tbxAppKey_TextChanged(object sender, EventArgs e)
{
m_DropNetClient = null;
}
private void tbxAppSecret_TextChanged(object sender, EventArgs e)
{
m_DropNetClient = null;
}
}
}