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C#创建ActiveX
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内容图文
一、目标
创建一个Demo，使用C#创建ActiveX达到屏幕截图并展示图片的效果。
二、步骤
1. 使用Visual Studio创建一个Class Libary项目
2. 向Project中Add一个New Item -> Interface，命名为IObjectSafety.cs，代码如下
namespace
IEActiveX
{
//
为了让ActiveX控件获得客户端的信任，控件类需要实现一个名为“IObjectSafety”的接口。先创建该接口（注意，不能修改该接口的GUID值）
[ComImport,Guid("CB5BDC81-93C1-11CF-8F20-00805F2CD064")]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
publicinterface IObjectSafety
{
[PreserveSig]
int GetInterfaceSafetyOptions(ref Guid riid, [MarshalAs(UnmanagedType.U4)] refint pdwSupportedOptions,
[MarshalAs(UnmanagedType.U4)] refint pdwEnabledOptions);
[PreserveSig()]
int SetInterfaceSafetyOptions(ref Guid riid, [MarshalAs(UnmanagedType.U4)] int dwOptionSetMask,
[MarshalAs(UnmanagedType.U4)] int dwEnabledOptions);
}
}
3. 向Project中Add一个User Control...,命名为ScreenCapture.cs，代码如下
注意使用Guid工具生成下面的Guid
namespace
IEActiveX
{
[Guid(
"
84F44957-3A18-4B1B-96BB-9D7D1D7B577E
")] //使用VS工具里的GUID生成器生成唯一码publicpartialclass ScreenCapture : UserControl,IObjectSafety
{
public ScreenCapture()
{
InitializeComponent();
}
#region IObjectSafety 成员
privateconststring _IID_IDispatch = "{00020400-0000-0000-C000-000000000046}";
privateconststring _IID_IDispatchEx = "{a6ef9860-c720-11d0-9337-00a0c90dcaa9}";
privateconststring _IID_IPersistStorage = "{0000010A-0000-0000-C000-000000000046}";
privateconststring _IID_IPersistStream = "{00000109-0000-0000-C000-000000000046}";
privateconststring _IID_IPersistPropertyBag = "{37D84F60-42CB-11CE-8135-00AA004BB851}";
privateconstint INTERFACESAFE_FOR_UNTRUSTED_CALLER = 0x00000001;
privateconstint INTERFACESAFE_FOR_UNTRUSTED_DATA = 0x00000002;
privateconstint S_OK = 0;
privateconstint E_FAIL = unchecked((int)0x80004005);
privateconstint E_NOINTERFACE = unchecked((int)0x80004002);
privatebool _fSafeForScripting = true;
privatebool _fSafeForInitializing = true;
publicint GetInterfaceSafetyOptions(ref Guid riid, [MarshalAs(UnmanagedType.U4)] refint pdwSupportedOptions,
[MarshalAs(UnmanagedType.U4)] refint pdwEnabledOptions)
{
int result = E_FAIL;
string strGuid = riid.ToString("B");
pdwEnabledOptions = INTERFACESAFE_FOR_UNTRUSTED_CALLER | INTERFACESAFE_FOR_UNTRUSTED_DATA;
switch (strGuid)
{
case _IID_IDispatch:
case _IID_IDispatchEx:
result = S_OK;
pdwEnabledOptions = 0;
if (_fSafeForScripting)
pdwEnabledOptions = INTERFACESAFE_FOR_UNTRUSTED_CALLER;
break;
case _IID_IPersistStorage:
case _IID_IPersistStream:
case _IID_IPersistPropertyBag:
result = S_OK;
pdwEnabledOptions = 0;
if (_fSafeForInitializing)
pdwEnabledOptions = INTERFACESAFE_FOR_UNTRUSTED_DATA;
break;
default:
result = E_NOINTERFACE;
break;
}
return result;
}
publicint SetInterfaceSafetyOptions(ref Guid riid, [MarshalAs(UnmanagedType.U4)] int dwOptionSetMask,
[MarshalAs(UnmanagedType.U4)] int dwEnabledOptions)
{
int result = E_FAIL;
string strGuid = riid.ToString("B");
switch (strGuid)
{
case _IID_IDispatch:
case _IID_IDispatchEx:
if (((dwEnabledOptions & dwOptionSetMask) == INTERFACESAFE_FOR_UNTRUSTED_CALLER) && _fSafeForScripting)
result = S_OK;
break;
default:
result = E_NOINTERFACE;
break;
}
return result;
}
#endregionpublicstring PrintScreen()
{
Image baseImage = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
Graphics g = Graphics.FromImage(baseImage);
g.CopyFromScreen(new Point(0, 0), new Point(0, 0), Screen.AllScreens[0].Bounds.Size);
g.Dispose();
baseImage.Save("D:\\screen.jpg", ImageFormat.Jpeg);
Stream file = new FileStream("D:\\screen.jpg", FileMode.Open);
BinaryReader bw = new BinaryReader(file);
var buffer = newbyte[file.Length];
bw.Read(buffer, 0, buffer.Length);
bw.Close();
string b64 = Convert.ToBase64String(buffer);
return b64;
}
}
}
4. 设置Project属性，
Application => "Make assembly COM-Visible"(使程序集COM可见)
Build =>"Register for COM interop"(为COM互操作注册)
5. 生成该解决方案，该ActiveX会注册到系统Register
6. 在Web中调用该ActiveX
注意下面的 CLASSID="clsid:84F44957-3A18-4B1B-96BB-9D7D1D7B577E"> 必须和上面自己生成的一致
<!
DOCTYPE html
>
<
html
>
<
head
>
<
title
>Testing</title><meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="this is my page"><meta http-equiv="content-type" content="text/html; charset=UTF-8"><script>function jt(){
var str="";
try
{
var obj = document.getElementById("IEActiveX");
str=obj.PrintScreen();
}
catch(e)
{
alert(e);
return;
}
var img=document.getElementById("img");
img.src="data:image/jpeg;base64,"+str;//接受base64编码后的图片 }
</script></head><body><OBJECT ID="IEActiveX" WIDTH="120" HEIGHT=20" CLASSID="clsid:84F44957-3A18-4B1B-96BB-9D7D1D7B577E"></OBJECT><input type="button" value="ScreenCapture" onclick="jt();"><Image id ="img"/></body></html>
三、运行结果
原文：http://www.cnblogs.com/Niko12230/p/5588509.html
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