博文
C#开发多功能语言复读机 ---之--- 网页浏览器开发
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Captain Dialog 2009-11-06
1 基本的网页浏览器功能
利用C#开发网页浏览器需要用到WebBrowser控件，使用方法可以参考：Creating a simple web broswer http://www.dreamincode.net/forums/showtopic57191.htm, 的确实很简单， 下面介绍一下本项目需要使用的方法过程：
首先在窗体上添加控件WebBrowser，默认名为WebBrowser1.然后再添加一个工具栏，用于控制网页浏览器的操作。
//=====================================================================
#region "Web Broswer操作"
1.1 返回操作，调用方法GoBack()；
private void toolStripButton_Back_Click(object sender, EventArgs e)
{
webBrowser1.GoBack();
}
1.2 前进操作；
private void toolStripButton_Forward_Click(object sender, EventArgs e)
{
webBrowser1.GoForward();
}
1.3 刷新操作；
private void toolStripButton_Refresh_Click(object sender, EventArgs e)
{
webBrowser1.Refresh();
}
1.4 停止操作；
private void toolStripButton_Stop_Click(object sender, EventArgs e)
{
webBrowser1.Stop();
}
1.5 链接到主页；
private void toolStripButton_Home_Click(object sender, EventArgs e)
{
webBrowser1.GoHome();
}
1.6 链接到指定的网址；其中地址为oolStripTextBox的输入内容。
private void toolStripButton_Go_Click(object sender, EventArgs e)
{
webBrowser1.Navigate(toolStripTextBox_URL.Text);
}
增加相应键盘回车响应功能。
private void toolStripTextBox_URL_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter)
{
//触发Go按钮单击事件
webBrowser1.Navigate(toolStripTextBox_URL.Text);
}
}
1.7 相应的文档处理；增加了错误指令的控制；防止新窗口打开调用默认的浏览器，而是在本窗口直接打开。
private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
toolStripTextBox_URL.Text = e.Url.ToString();
//重新定向新连接为本窗口--------------------------
//将所有的链接的目标，指向本窗体
foreach (HtmlElement archor in this.webBrowser1.Document.Links) {
archor.SetAttribute("target", "_self");
}
//将所有的FORM的提交目标，指向本窗体
foreach (HtmlElement form in this.webBrowser1.Document.Forms) {
form.SetAttribute("target", "_self");
}
}
private void webBrowser1_Navigated(object sender, WebBrowserNavigatedEventArgs e)
{
Status.Text = e.Url.ToString();
this.Text = e.Url + " - Web Browser";
ProgressBarStatus.Visible = false;
}
private void webBrowser1_ProgressChanged(object sender, WebBrowserProgressChangedEventArgs e)
{
ProgressBarStatus.Maximum = Convert.ToInt32(e.MaximumProgress);
ProgressBarStatus.Value = Convert.ToInt32(e.CurrentProgress);
}
private void webBrowser1_Navigating(object sender, WebBrowserNavigatingEventArgs e)
{
ProgressBarStatus.Visible = true;
}
//禁用新窗口打开
private void webBrowser1_NewWindow(object sender, CancelEventArgs e) {
e.Cancel = true;
}
Appendix：由于基本的WebBrowser操作可能会在网页浏览过程中出现各种问题，所以进行了一些列的修正方法，查阅了大量的文献之后，参考了一下的一些方法：
[1] C#防止WebBrowser在新窗口中打开链接页面 http://www.zu14.cn/2009/07/31/csharp-webbrowser-avoid-to-open-link-in-new-window/ ；
[2] WebBrowser控件禁用超链接转向、脚本错误提示、默认右键菜单和快捷键 http://www.zu14.cn/2008/11/19/webbrowser/ ；
2 网页浏览器加强功能
2.1 保存网页文件
2.1.1将网页保存为Mht文件，参考 http://luoyahu.javaeye.com/blog/397159 方法后：
private void toolStripButton_Save_Click(object sender, EventArgs e)
{
using(SaveFileDialog save = new SaveFileDialog())
{
save.Filter = "MHT文件|*.mht";
if (save.ShowDialog() == DialogResult.OK)
{
string str_FilePath = save.FileName;
CDO.Message msg = new CDO.MessageClass();
CDO.Configuration cfg = new CDO.ConfigurationClass();
msg.Configuration = cfg;
msg.CreateMHTMLBody(toolStripTextBox_URL.Text, CDO.CdoMHTMLFlags.cdoSuppressAll, "", "");
msg.GetStream().SaveToFile(str_FilePath, ADODB.SaveOptionsEnum.adSaveCreateOverWrite);
// MessageBox.Show("保存成功:" + toolStripTextBox_URL.Text);
notifyIcon1.BalloonTipTitle = "信息提示";
notifyIcon1.BalloonTipText = String.Format("文件保存成功:rn{0}", toolStripTextBox_URL.Text);
notifyIcon1.ShowBalloonTip(1000);
}
}
}
2.1.2 将网页保存为Http文件；
private void toolStripButton_Save2HTTP_Click(object sender, EventArgs e)
{
using (SaveFileDialog save = new SaveFileDialog()) {
save.Filter = "HTM文件|*.htm";
if (save.ShowDialog() == DialogResult.OK) {
string str_FilePath = save.FileName;
HttpWebRequest myReq = (HttpWebRequest)WebRequest.Create(toolStripTextBox_URL.Text);
HttpWebResponse myResp = (HttpWebResponse)myReq.GetResponse();
StreamReader respStream = new StreamReader(myResp.GetResponseStream(), Encoding.Default);
string respStr = respStream.ReadToEnd();
respStream.Close();
FileStream fs = new FileStream(str_FilePath, FileMode.Create, FileAccess.Write);
StreamWriter sw = new StreamWriter(fs, Encoding.Default);
sw.Write(respStr);
sw.Close();
// MessageBox.Show("保存成功:" + toolStripTextBox_URL.Text);
notifyIcon1.BalloonTipTitle = "信息提示";
notifyIcon1.BalloonTipText = String.Format("文件保存成功:rn{0}", toolStripTextBox_URL.Text);
notifyIcon1.ShowBalloonTip(1000);
}
}
}
2.1.3 将网页保存为图片；具体方法参考了：C# 网页抓图 实现 SNAP 的效果 http://www.zu14.cn/2009/02/11/csharp-webpage-snapshot/
private void toolStripButton_Save2Pic_Click(object sender, EventArgs e) {
try {
saveFileDialog.InitialDirectory = str_Project+"\"+str_ProjectName;
saveFileDialog.FileName = str_Project + "\" + str_ProjectName;
DialogResult result = saveFileDialog.ShowDialog();
if (result == DialogResult.OK && !string.IsNullOrEmpty(saveFileDialog.FileName)) {
string filename = saveFileDialog.FileName.Trim();
ImageFormat format = ImageFormat.Jpeg;
switch (filename.ToLower()) {
case "bmp":
format = ImageFormat.Bmp;
break;
case "jpg":
case "jpeg":
format = ImageFormat.Jpeg;
break;
case "png":
default:
format = ImageFormat.Png;
break;
}
SaveImage(saveFileDialog.FileName, format);
if (MessageBox.Show("保存完成!n是否打开图片文件?", "系统提示", MessageBoxButtons.YesNo, MessageBoxIcon.Information) == DialogResult.Yes) {
System.Diagnostics.Process.Start(filename);
}
}
}
catch { }
}
//保存为图片
private void SaveImage(string path, ImageFormat format) {
int browserWidth = webBrowser1.Width;
int browserHeight = webBrowser1.Height;
Rectangle rectBody = this.webBrowser1.Document.Body.ScrollRectangle;
int width = rectBody.Width + 20;
int height = rectBody.Height;
this.webBrowser1.Width = width;
this.webBrowser1.Height = height;
try {
SnapLibrary.Snapshot snap = new SnapLibrary.Snapshot();
using (Bitmap bmp = snap.TakeSnapshot(this.webBrowser1.ActiveXInstance, new Rectangle(0, 0, width, height))) {
//this.webBrowser.DrawToBitmap(bmp, new Rectangle(0, 0, width, height));
bmp.Save(path, format);
//using (Image img = ImageHelper.GetThumbnailImage(bmp, bmp.Width, bmp.Height))
//{
// ImageHelper.SaveImage(img, path, format);
//}
}
}
catch (Exception ex) { MessageBox.Show(ex.Message); }
this.webBrowser1.Width = browserWidth;
this.webBrowser1.Height = browserHeight;
}
2.2 网页地址自动补全操作
添加一个用于存放地址的ComboBox控件，并且设置一些参数：
AutoCompletMode = SuggestAppend; AutoCompleteSource = ListItems;
定义内存上用于存储地址的变量：
//自动补全网址存储
DataTable dt_WebAddress;
窗体初始化时候设置：
//网页地址自动补全的相关操作
dt_WebAddress = new DataTable();
cbx_WebAddress.DataSource = dt_WebAddress;
dt_WebAddress.Columns.Add("Name");
dt_WebAddress.Columns.Add("VV");
cbx_WebAddress.DisplayMember = "Name";
cbx_WebAddress.ValueMember = "VV";
地址数据保存：
private void cbx_WebAddress_Leave(object sender, EventArgs e) {
//增加已经输入的地址
dt_WebAddress.Rows.Add(new string[] { cbx_WebAddress.Text, "x" });
}
//网页地址输入2
private void cbx_WebAddress_KeyDown(object sender, KeyEventArgs e) {
if (e.KeyCode == Keys.Enter) {
//触发Go按钮单击事件
webBrowser1.Navigate(cbx_WebAddress.Text);
//增加已经输入的地址
dt_WebAddress.Rows.Add(new string[] { cbx_WebAddress.Text, "x" });
}
}
#endregion
2.3 收藏夹功能实现
窗体初始化：
//收藏夹
BuildTopTree(this.treeView);
//添加链接
private void btn_AddLink_Click(object sender, EventArgs e) {
toolStripButton_AddLink_Click(sender, e);
}
#region "网页收藏夹操作"
public void BuildTopTree(TreeView tv)
{
TreeNodeCollection tnParentNodes = tv.Nodes;
TreeNode tnChildNode;
tnParentNodes.Clear();
strSQL = "select * from Favorite where parent_id=0";
DataTable dtTop = AccessDataBase.GetDataTable(strSQL);
int countTop = dtTop.Rows.Count;
for (int i = 0; i < countTop; i++)
{
tnChildNode = new TreeNode();
tnChildNode.Tag = dtTop.Rows[i]["id"].ToString();
tnChildNode.Text = dtTop.Rows[i]["title"].ToString();
tnChildNode.ContextMenuStrip = contextMenuStrip_Group;
strSQL = string.Format("select * from Favorite where parent_id={0}", tnChildNode.Tag.ToString());
DataTable dtSub = AccessDataBase.GetDataTable(strSQL);
int countSub = dtSub.Rows.Count;
for (int j = 0; j < countSub; j++)
{
TreeNode tnTempNode = new TreeNode();
tnTempNode.Tag = dtSub.Rows[j]["id"].ToString();
tnTempNode.Text = dtSub.Rows[j]["title"].ToString();
tnTempNode.ToolTipText = dtSub.Rows[j]["description"].ToString();
tnTempNode.ContextMenuStrip = contextMenuStrip_Link;
tnTempNode.ImageIndex = 2;
tnTempNode.SelectedImageIndex = 2;
tnChildNode.Nodes.Add(tnTempNode);
}
tnParentNodes.Add(tnChildNode);
}
}
private void renameToolStripMenuItem1_Click(object sender, EventArgs e)
{
tnTreeNode = treeView.SelectedNode;
if (tnTreeNode == null)
{
MessageBox.Show(this, "请选择相应的链接!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
}
id = Convert.ToInt32(tnTreeNode.Tag);
LinkForm form = new LinkForm();
form.Title = "重命名标题";
form.LinkTitle = tnTreeNode.Text;
form.EnableTitle = false;
DialogResult dr = form.ShowDialog(this);
if (dr.Equals(DialogResult.OK))
{
strSQL = string.Format("update Favorite set title='{0}' where id={1}", form.LinkTitle, id);
AccessDataBase.ExecuteSql(strSQL);
BuildTopTree(this.treeView);
}
}
private void deleteToolStripMenuItem1_Click(object sender, EventArgs e)
{
tnTreeNode = treeView.SelectedNode;
if (tnTreeNode == null)
{
MessageBox.Show(this, "请选择相应的链接!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
}
id = Convert.ToInt32(tnTreeNode.Tag);
String strMsg = String.Format("确认要删除'{0}'吗?", tnTreeNode.Text);
DialogResult dr = MessageBox.Show(this, strMsg, "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Information);
if (dr.Equals(DialogResult.OK))
{
strSQL = String.Format("delete from Favorite where id={0}", id);
AccessDataBase.ExecuteSql(strSQL);
BuildTopTree(this.treeView);
}
}
private void propertyToolStripMenuItem_Click(object sender, EventArgs e)
{
tnTreeNode = treeView.SelectedNode;
if (tnTreeNode == null)
{
MessageBox.Show(this, "请选择相应的链接!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
}
id = Convert.ToInt32(tnTreeNode.Tag);
LinkForm form = new LinkForm();
form.Title = "链接的属性";
strSQL = string.Format("select * from Favorite where id={0}", id);
DataTable dt = AccessDataBase.GetDataTable(strSQL);
form.LinkTitle = dt.Rows[0]["title"].ToString();
form.Url = dt.Rows[0]["url"].ToString();
form.Description = dt.Rows[0]["description"].ToString();
form.Parnet_Id = Convert.ToInt32(dt.Rows[0]["parent_id"]);
DialogResult dr = form.ShowDialog(this);
if (dr.Equals(DialogResult.OK))
{
strSQL = string.Format("update Favorite set title='{0}',url='{1}',description='{2}',parent_id={3} where id={4}", form.LinkTitle, form.Url, form.Description, form.Parnet_Id, id);
AccessDataBase.ExecuteSql(strSQL);
BuildTopTree(this.treeView);
}
}
//重命名组
private void renameToolStripMenuItem_Click(object sender, EventArgs e)
{
tnTreeNode = treeView.SelectedNode;
if (tnTreeNode == null)
{
MessageBox.Show(this, "请选择相应的分类!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
}
id = Convert.ToInt32(tnTreeNode.Tag);
GroupForm form = new GroupForm();
form.Title = "重命名分组";
form.GroupName = tnTreeNode.Text;
DialogResult dr = form.ShowDialog(this);
if (dr.Equals(DialogResult.OK))
{
strSQL = string.Format("update Favorite set [title]='{0}' where id={1}", form.GroupName, id);
AccessDataBase.ExecuteSql(strSQL);
BuildTopTree(this.treeView);
}
}
//删除组
private void deleteToolStripMenuItem_Click(object sender, EventArgs e)
{
tnTreeNode = treeView.SelectedNode;
if (tnTreeNode == null)
{
MessageBox.Show(this, "请选择相应的分类!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
}
id = Convert.ToInt32(tnTreeNode.Tag);
strSQL = string.Format("select * from Favorite where parent_id={0}", id);
int count = 0;
count = AccessDataBase.GetDataTable(strSQL).Rows.Count;
if (count != 0)
MessageBox.Show(this, "请先清空该组下的项!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
else
{
String strMsg = String.Format("确认要删除'{0}'吗?", tnTreeNode.Text);
DialogResult dr = MessageBox.Show(this, strMsg, "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Information);
if (dr.Equals(DialogResult.OK))
{
strSQL = String.Format("delete from Favorite where id={0}", id);
AccessDataBase.ExecuteSql(strSQL);
BuildTopTree(this.treeView);
}
}
}
private void toolStripButton_AddLink_Click(object sender, EventArgs e)
{
LinkForm form = new LinkForm();
form.Title = "添加链接";
form.textBox_Url.Text = toolStripTextBox_URL.Text;
DialogResult dr = form.ShowDialog(this);
if (dr.Equals(DialogResult.OK))
{
strSQL = String.Format("insert into Favorite(title,url,description,parent_id)values('{0}','{1}','{2}','{3}')", form.LinkTitle, form.Url, form.Description, form.Parnet_Id);
AccessDataBase.ExecuteSql(strSQL);
BuildTopTree(this.treeView);
}
}
private void btn_AddNewGroup_Click(object sender, EventArgs e)
{
soundSlide.Play();
GroupForm form = new GroupForm();
form.Title = "添加分组";
DialogResult dr = form.ShowDialog(this);
if (dr.Equals(DialogResult.OK))
{
strSQL = String.Format("insert into Favorite(title)values('{0}')", form.GroupName);
AccessDataBase.ExecuteSql(strSQL);
BuildTopTree(this.treeView);
}
}
private void treeView_MouseUp(object sender, MouseEventArgs e)
{
//当鼠标右击时,将鼠标所在的节点作为选中节点()
Point p = new Point(e.X, e.Y);
TreeNode tnTempNode = this.treeView.GetNodeAt(p);
if (tnTempNode != null && e.Button == MouseButtons.Right)
{
this.treeView.SelectedNode = tnTempNode;
}
if (tnTempNode != null && e.Button == MouseButtons.Left)
{
this.treeView.SelectedNode = tnTempNode;
if (this.treeView.SelectedNode.Nodes.Count == 0)
{
id = Convert.ToInt32(this.treeView.SelectedNode.Tag);
strSQL = string.Format("select url from Favorite where id={0}", id);
String url = AccessDataBase.GetDataTable(strSQL).Rows[0]["url"].ToString();
//CreateNewWebBrowser().Navigate(url);
webBrowser1.Navigate(url);
}
}
}
#endregion
3 讨论
还有就是现在十分流行的多页浏览的功能，需要动态操作TabPages的实现，暂时没有实现。
https://blog.sciencenet.cn/blog-244606-269045.html
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