在IE右键菜单，添加图片保存快捷方式

先用C#做一个COM

作用为下载图片和图片改名（使用GUID）

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.IO;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Threading;

[assembly: AssemblyKeyFile("gachal_d_key.snk")]
namespace PicsDown
{
[Guid("694C1820-04B6-4988-928F-FD858B95C880")]
public interface DownLoad_Interface
{
[DispId(1)]
void Down(string url, string dir);
[DispId(2)]
void SavePhotoFromUrl(string FileName, string Url);
[DispId(3)]
bool SaveBinaryFile(WebResponse response, string FileName);
}

// 事件接口Database_COMObjectEvents
[Guid("47C976E0-C208-4740-AC42-41212D3C34F0"),
InterfaceType(ComInterfaceType.InterfaceIsIDispatch)]
public interface DownLoad_Events
{
}

delegate void MyDelegate(string FileName, string Url);

[Guid("9E5E5FB2-219D-4ee7-AB27-E4DBED8E123E"),
ClassInterface(ClassInterfaceType.None),
ComSourceInterfaces(typeof(DownLoad_Events))]
public class DownLoad : DownLoad_Interface
{
public void Down(string url,string dir)
{
string FileName;
string Url;
string tempUrl = url.Substring(url.Length - 5, 5);
tempUrl = tempUrl.Substring(tempUrl.IndexOf(".", 0), 4);
if (tempUrl == ".jpe")
{
tempUrl = ".jpeg";
}
FileName = @dir + Guid.NewGuid().ToString() + tempUrl;
Url = url;

MyDelegate del = new MyDelegate(this.SavePhotoFromUrl);
IAsyncResult ar = del.BeginInvoke(FileName, Url, null, null);

//del.EndInvoke(ar);
}

/// <summary>
/// 从图片地址下载图片到本地磁盘
/// </summary>
/// <param name="ToLocalPath">图片本地磁盘地址</param>
/// <param name="Url">图片网址</param>
/// <returns></returns>
public void SavePhotoFromUrl(string FileName, string Url)
{
bool Value = false;
WebResponse response = null;
Stream stream = null;

try
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);

response = request.GetResponse();
stream = response.GetResponseStream();

if (!response.ContentType.ToLower().StartsWith("text/"))
{
Value = SaveBinaryFile(response, FileName);
}
}
catch (Exception err)
{
string aa = err.ToString();
}
}

/// <summary>
/// Save a binary file to disk.
/// </summary>
/// <param name="response">The response used to save the file</param>
// 将二进制文件保存到磁盘
public bool SaveBinaryFile(WebResponse response, string FileName)
{
bool Value = true;
byte[] buffer = new byte[1024];

try
{
if (File.Exists(FileName))
File.Delete(FileName);
Stream outStream = System.IO.File.Create(FileName);
Stream inStream = response.GetResponseStream();

int l;
do
{
l = inStream.Read(buffer, 0, buffer.Length);
if (l > 0)
outStream.Write(buffer, 0, l);
}
while (l > 0);

outStream.Close();
inStream.Close();
}
catch
{
Value = false;
}
return Value;
}
}
}

在这之前先建立snk文件，sn -k gachal_d_key.snk，在文件放在项目中

注意在VS中，项目->属性->应用程序->信息集信息 中 把程序集COM可见 选择

项目->属性->生成 为COM互操作注册 选择

这里使用了多线程运行SavePhotoFromUrl函数，保证保存图片时不会“卡卡”的

然后在注册表HKEY_CURRENT_USER/Software/Microsoft/Internet Explorer/MenuExt

上添加新项，命名为保存图片(&x)，注意X将被设为快捷键

在该项添加一个字符值，名字默认，值为c:/download.htm

再添加一个DWORD值，名字为contexts，值为十六进制的2

在c盘新建名为download.htm的文件，内容如下

<mce:script language="javascript"><!--

var objNetSamp=new ActiveXObject("PicsDown.DownLoad");//创建COM DLL对象
var srcEvent = external.menuArguments.event;
var EventElement;

if(typeof(srcEvent.clientX) == "undefined")
{
EventElement = external.menuArguments.document.elementFromPoint ( srcEvent.pointerX, srcEvent.pointerY );
}
else
{
EventElement = external.menuArguments.document.elementFromPoint ( srcEvent.clientX, srcEvent.clientY );
}

if(EventElement != null && EventElement.tagName == "IMG")
{
objNetSamp.Down(EventElement.src,"C://pics//");
}
// --></mce:script>

OK，以后在IE保存图片就直接右键然后按X就会保存到c:/pic中，要改为其他目录只要修改download.htm的文件即可。