C#中用SslEmptyCache系统API来清除SSL状态

如果需要编程实现IE选项中清除SSL状态的功能,可用SslEmptyCache函数,SslEmptyCache函数定义在Schannel.dll中,采用动态链接即可。

 

代码如下:

using System;
using System.Runtime.InteropServices;

namespace Demo
{
    
public class Ssl
    {
        [DllImport(
"kernel32.dll")]
        
internal static extern IntPtr LoadLibrary(String dllname);

        [DllImport(
"kernel32.dll")]
        
internal static extern IntPtr GetProcAddress(IntPtr hModule, String procname);

        
internal delegate bool SslEmptyCacheHelper(IntPtr targetName, int flags);

        
/// <summary>
        
/// UNICODE版
        
/// </summary>
        
/// <returns></returns>
        public bool SslEmptyCacheW()
        {
            IntPtr schannel 
= LoadLibrary("Schannel.dll");
            IntPtr procaddr 
= GetProcAddress(schannel, "SslEmptyCacheW");
            SslEmptyCacheHelper helper 
= (SslEmptyCacheHelper)Marshal.GetDelegateForFunctionPointer(procaddr, typeof(SslEmptyCacheHelper));
            
return helper(IntPtr.Zero, 0);
        }

        
/// <summary>
        
/// ANSI版
        
/// </summary>
        
/// <returns></returns>
        public bool SslEmptyCacheA()
        {
            IntPtr schannel 
= LoadLibrary("Schannel.dll");
            IntPtr procaddr 
= GetProcAddress(schannel, "SslEmptyCacheA");
            SslEmptyCacheHelper helper 
= (SslEmptyCacheHelper)Marshal.GetDelegateForFunctionPointer(procaddr, typeof(SslEmptyCacheHelper));
            
return helper(IntPtr.Zero, 0);
        }
    }

}

 

参考资料:

1、SslEmptyCache Function

2、.NET 2.0 中 GetDelegateForFunctionPointer 函数实现原理浅析 [草稿]

posted @ 2008-08-16 13:00  程序员海风  阅读(1224)  评论(0编辑  收藏  举报