c# - 如何 Cefsharp 'callbak' 是 pause() 和 resume()？
问题描述
我想检查cefsharp chromiumbrowser 中的downloadHandler。我的目标是暂停和恢复任何下载。为此，我尝试了 downloadHandler 中callback.pause ()的callback.resume ()命令。但是我遇到了一些问题，我该如何解决呢？
问题：
- 但是在我的代码中，当我使用命令时，关闭
callback.pause()进程 和命令不起作用。给出命令 callback.pause() 后，我应该能够给出命令 callback.resume() 并从中断处继续下载。OnDownloadUpdatedcallback.resume()
视频：https ://youtu.be/3A_HHrEJfTM
工作原则：
OnBeforeDownload操作运行时，通过“mainForm”中的downloadItem“”功能添加提供下载信息和控制DownloadMenuItemADD()的“面板”。在函数“OnDownloadUpdated”中，提供下载信息和控制的“downloadItem”面板中的信息被函数“SETDownloadMenuItemADD”更新。
由于“DownloadHandler.cs”中的“布尔暂停和恢复”，执行了“callback.pause() 和 callback.resume()”事务。
截图
编码所有 DownloadHandler.cs [编辑]
using CefSharp;
using System;
using System.Windows.Forms;
namespace gencayWeb
{
public class DownloadHandler : IDownloadHandler
{
public event EventHandler<DownloadItem> OnBeforeDownloadFired;
public event EventHandler<DownloadItem> OnDownloadUpdatedFired;
Form1 mainForm;
public DownloadHandler(Form1 form)
{
mainForm = form;
}
public bool pause = false;
public bool resume = false;
public string temp="0"; //NEW
public string _Status="null";
public string _SuggestedFileName="null";
public void OnBeforeDownload(IWebBrowser chromiumWebBrowser, IBrowser browser, DownloadItem downloadItem, IBeforeDownloadCallback callback)
{
_SuggestedFileName = downloadItem.SuggestedFileName;
_Status = "Downloading...";
mainForm.DownloadMenuItemADD( _Status, _SuggestedFileName, downloadItem.OriginalUrl, downloadItem.Url, downloadItem.Id, downloadItem.FullPath, downloadItem.StartTime, HesaplaRececive(downloadItem), HesaplaTotal(downloadItem), downloadItem.PercentComplete, Convert.ToString(ConvertBytesToMegabytes(downloadItem.CurrentSpeed)));
var handler = OnBeforeDownloadFired;
if (handler != null)
{
handler(this, downloadItem);
}
if (!callback.IsDisposed)
{
using (callback)
{
callback.Continue(mainForm.FilePath + "\\" + downloadItem.SuggestedFileName, showDialog: false);
}
}
}
public void OnDownloadUpdated(IWebBrowser chromiumWebBrowser, IBrowser browser, DownloadItem downloadItem, IDownloadItemCallback callback)
{
var handler = OnDownloadUpdatedFired;
if (handler != null)
{
handler(this, downloadItem);
}
if (temp == downloadItem.Id.ToString()) //NEW
{
if (pause)
{
callback.Pause();
pause = false;
//_Status = "Paused...";
mainForm.SETDownloadMenuItemSTATUS("Paused...", downloadItem.Id); //NEW
//mainForm.SETDownloadMenuItemADD("Paused...", downloadItem.Id, HesaplaRececive(downloadItem), downloadItem.PercentComplete, Convert.ToString(ConvertBytesToMegabytes(downloadItem.CurrentSpeed)));
MessageBox.Show("CALLBACK PAUSED:", "In DownloadHandler.cs");
}
if (resume)
{
callback.Resume();
resume = false;
//_Status = "Resumed...";
mainForm.SETDownloadMenuItemSTATUS("Resumed",downloadItem.Id);
//mainForm.SETDownloadMenuItemADD("Resumed...", downloadItem.Id, HesaplaRececive(downloadItem), downloadItem.PercentComplete, Convert.ToString(ConvertBytesToMegabytes(downloadItem.CurrentSpeed)));
MessageBox.Show("CALLBACK RESUMED!", "In DownloadHandler.cs");
}
temp = "0";
}
mainForm.SETDownloadMenuItemADD(downloadItem.Id, HesaplaRececive(downloadItem), downloadItem.PercentComplete, Convert.ToString(ConvertBytesToMegabytes(downloadItem.CurrentSpeed)));
if (downloadItem.IsComplete || downloadItem.IsCancelled)
{
if (downloadItem.IsComplete)
{
//_Status = "Completed.";
mainForm.SETDownloadMenuItemSTATUS("Completed", downloadItem.Id);
// mainForm.SETDownloadMenuItemADD("Completed.", downloadItem.Id, HesaplaRececive(downloadItem), downloadItem.PercentComplete, Convert.ToString(ConvertBytesToMegabytes(downloadItem.CurrentSpeed)));
}
if (downloadItem.IsCancelled)
{
//_Status = "Cancelled.";
mainForm.SETDownloadMenuItemSTATUS("Cancelled", downloadItem.Id);
// mainForm.SETDownloadMenuItemADD("Cancelled.", downloadItem.Id, HesaplaRececive(downloadItem), downloadItem.PercentComplete, Convert.ToString(ConvertBytesToMegabytes(downloadItem.CurrentSpeed)));
}
if (downloadItem.IsComplete && downloadItem.IsCancelled)
{
//_Status = "Complete And Cancelled!, This may generate an error";
mainForm.SETDownloadMenuItemSTATUS("Complete And Cancelled!, This may generate an error", downloadItem.Id);
// mainForm.SETDownloadMenuItemADD("Complete And Cancelled!, This may generate an error...", downloadItem.Id, HesaplaRececive(downloadItem), downloadItem.PercentComplete, Convert.ToString(ConvertBytesToMegabytes(downloadItem.CurrentSpeed)));
}
}
//Converting byte type data
static double ConvertBytesToBayt(long bytes)
{
return bytes;
}
static double ConvertBytesToKilobytes(long bytes)
{
return bytes / 1024f;
}
static double ConvertBytesToMegabytes(long bytes)
{
return (bytes / 1024f) / 1024f;
}
static double ConvertBytesToCigabytes(long bytes)
{
return ((bytes / 1024f) / 1024f) / 1024f;
}
private string HesaplaTotal(DownloadItem downloadItem)
{
long bol = 1;
int turno = 0;
string tur = "";
double boyut = 0;
for (bol = 1; downloadItem.TotalBytes >= bol; bol *= 1024)
{
turno++;
}
switch (turno)
{
case 1:
tur = " Bayt";
boyut = ConvertBytesToBayt(downloadItem.TotalBytes);
break;
case 2:
tur = " KB";
boyut = ConvertBytesToKilobytes(downloadItem.TotalBytes);
break;
case 3:
tur = " MB";
boyut = ConvertBytesToMegabytes(downloadItem.TotalBytes);
break;
case 4:
tur = " GB";
boyut = ConvertBytesToCigabytes(downloadItem.TotalBytes);
break;
}
return boyut + tur;
}
private string HesaplaRececive(DownloadItem downloadItem)
{
long bol = 1;
int turno = 0;
string tur = "";
double boyut = 0;
for (bol = 1; downloadItem.ReceivedBytes >= bol; bol *= 1024)
{
turno++;
}
switch (turno)
{
case 1:
tur = " Bayt";
boyut = ConvertBytesToBayt(downloadItem.ReceivedBytes);
break;
case 2:
tur = " KB";
boyut = ConvertBytesToKilobytes(downloadItem.ReceivedBytes);
break;
case 3:
tur = " MB";
boyut = ConvertBytesToMegabytes(downloadItem.ReceivedBytes);
break;
case 4:
tur = " GB";
boyut = ConvertBytesToCigabytes(downloadItem.ReceivedBytes);
break;
}
return boyut + tur;
}
}
}
编写一点Form1.cs
using System;
using System.Drawing;
using System.Windows.Forms;
using CefSharp;
using CefSharp.WinForms;
using System.IO;
namespace gencayWeb
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
//...
}
private DownloadHandler downer;
ChromiumWebBrowser browser;
//...
private void browserButton_Click(object sender, EventArgs e)
{
//...
browser = new ChromiumWebBrowser("google.com")
{
Name = "browser" + id,
Dock = DockStyle.None,
Location = new Point(0, 40),
BackColor = Color.White,
Visible = true,
Tag = id,
Anchor = AnchorStyles.Top | AnchorStyles.Right | AnchorStyles.Left | AnchorStyles.Bottom,
};
browser.DownloadHandler = downer;
//...
this.Invoke((MethodInvoker)delegate ()
{
this.Controls.Add(browser);
});
//...
}
//...
public string FilePath = Application.StartupPath + "\\Download";
public string fileName = "";
private void ActiveDownloads_Click(object sender, EventArgs e)
{
if (downloadsMenu.Visible == false)
downloadsMenu.Visible = true;
else
downloadsMenu.Visible = false;
}
public void DownloadMenuItemADD(string Status,string SuggestedFileName, string OriginalUrl, string Url, int Id, string FullPath, DateTime? StartTime, string ReceivedBytes, string TotalBytes, int PercentComplete, string CurrentSpeed)
{
fileName = SuggestedFileName;
// MessageBox.Show("::"+"Status:"+Status+"\nDosya: "+SuggestedFileName+"\nId:"+Id+"\nBoyut:"+TotalBytes,"On before");
activeDownloads.Visible = true;
downloadsMenu.Visible = true;
downloadsMenu.BringToFront();
downloadsMenu.Size = new Size();
Panel downloadItem = new Panel()
{
Name = Id.ToString(),
Dock= DockStyle.Top,
Height=100,
AutoSize = true,
Visible = true,
};
Panel cubukUst = new Panel()
{
Name = "cubukUst",
Dock = DockStyle.Top,
Height = 3,
BackColor = Color.Blue,
};
Panel cubukAlt = new Panel()
{
Name = "cubukAlt",
Dock = DockStyle.Bottom,
Height = 3,
BackColor = Color.Blue,
};
downloadItem.Controls.Add(cubukAlt);
downloadItem.Controls.Add(cubukUst);
Label infoLbl = new Label()
{
Name = "infoLbl",
Location=new Point(3,3),
AutoSize=true,
Text="Name:"+SuggestedFileName+"\nSize:"+TotalBytes,
};
downloadItem.Controls.Add(infoLbl);
Label receivedLbl = new Label()
{
Name = "receivedLbl",
Location = new Point(3, infoLbl.Location.Y + infoLbl.Size.Height+10),
AutoSize = true,
Text = "Received: " + ReceivedBytes +"\nSpeed: "+CurrentSpeed,
};
downloadItem.Controls.Add(receivedLbl);
ProgressBar downlaodProgress = new ProgressBar()
{
Name = "downlaodProgress",
Maximum=100,
Value=PercentComplete,
Width=245,
Location=new Point(3, receivedLbl.Location.Y+ receivedLbl.Size.Height+15),
};
downloadItem.Controls.Add(downlaodProgress);
Label percentLbl = new Label()
{
Name = "percentLbl",
Location = new Point(3, downlaodProgress.Location.Y+downlaodProgress.Height+3),
AutoSize = true,
Text = "% " + PercentComplete,
};
downloadItem.Controls.Add(percentLbl);
Label statusLbl = new Label()
{
Name = "statusLbl",
Location = new Point( 70, percentLbl.Location.Y),
AutoSize = true,
Text = "Status: " + Status,
};
downloadItem.Controls.Add(statusLbl);
Button pauseBtn = new Button()
{
Name = "pauseBtn",
AutoSize=true,
Location = new Point(3,percentLbl.Location.Y+ percentLbl.Height+5),
Text="Pause",
Enabled=true,
};
downloadItem.Controls.Add(pauseBtn);
pauseBtn.Click += PauseBtn_Click;
Button resumeBtn = new Button()
{
Name = "resumeBtn",
AutoSize = true,
Location = new Point(pauseBtn.Width+pauseBtn.Location.X+5, pauseBtn.Location.Y),
Text = "Resume",
Enabled = true,
};
downloadItem.Controls.Add(resumeBtn);
resumeBtn.Click += ResumeBtn_Click;
Button openBtn = new Button()
{
Name = "openBtn",
AutoSize = true,
Location = new Point(resumeBtn.Width + resumeBtn.Location.X + 15, resumeBtn.Location.Y),
Text = "Open",
Enabled = true,
Tag = fileName,
};
downloadItem.Controls.Add(openBtn);
openBtn.Click += Open_Click;
downloadsMenu.Controls.Add(downloadItem);
}
//NEW
public void SETDownloadMenuItemSTATUS(string Status, int Id)
{
var item = downloadsMenu.Controls[Id.ToString()];
if (item != null)
{
item.Controls["statusLbl"].Text = Status;
}
}
public void SETDownloadMenuItemADD(int Id, string ReceivedBytes, int PercentComplete, string CurrentSpeed) //EDIT
{
// MessageBox.Show("Status:"+Status+" ID:"+Id+" Received:"+ReceivedBytes+" Percent:"+PercentComplete+" Current:"+CurrentSpeed,"on download");
var item = downloadsMenu.Controls[Id.ToString()];
if (item != null)
{
item.Controls["percentLbl"].Text = "% " + PercentComplete;
(item.Controls["downlaodProgress"] as ProgressBar).Value = PercentComplete;
item.Controls["receivedLbl"].Text = "Received: " + ReceivedBytes + "\nSpeed: " + CurrentSpeed;
if (PercentComplete == 100)
{
item.Controls["resumeBtn"].Enabled = false;
item.Controls["pauseBtn"].Enabled = false;
item.Controls["openBtn"].Enabled = true;
}
else
{
item.Controls["openBtn"].Enabled = false;
}
}
}
private void Open_Click(object sender, EventArgs e)
{
Button btn = (Button)sender;
string downloadFilePath = FilePath + "\\" + btn.Tag;
if (File.Exists(downloadFilePath) == true)
{
try
{
System.Diagnostics.Process.Start(downloadFilePath);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Error opening file!",MessageBoxButtons.OK,MessageBoxIcon.Error);
}
}
else
{
MessageBox.Show("Error Path: "+ downloadFilePath, "Error! File not found.",MessageBoxButtons.OK,MessageBoxIcon.Error);
}
}
private void PauseBtn_Click(object sender, EventArgs e)//EDIT
{
Button btn = (Button)sender;
downer.temp = btn.Tag.ToString(); //btn.tag, downloadItem.Id is SAME
downer.pause = true;
downer.resume = false;
}
private void ResumeBtn_Click(object sender, EventArgs e)//EDIT
{
Button btn = (Button)sender;
downer.temp = btn.Tag.ToString();
downer.resume = true;
downer.pause = false;
}
}
}
解决方案
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