gprs 自动拨号 wince ppc

来源：互联网发布：mac pro 2016 尺寸编辑：程序博客网时间：2024/05/21 11:22
因为当我们做一个http请求时ppc会自动拨号,但是如果我们使用UDP做数据传输时是不会自动拨号的,为此我曾经给windowmobile@microsoft.com发邮件询问怎样用C#实现GPRS拨号.MS告诉我可以先做一个HTTP请求.做为一个应急的方案确实可以这样做.
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using System;  
using System.Collections.Generic;  
using System.Text;  
using System.Net;  
using System.Runtime.InteropServices;  
using System.Threading;  
using System.Collections;  
namespace PPc.GPRS  
{  
    public class GPRSConnection   
    {   
        const int S_OK = 0;   
        const uint CONNMGR_PARAM_GUIDDESTNET = 0x1;   
        const uint CONNMGR_FLAG_PROXY_HTTP = 0x1;   
        const uint CONNMGR_PRIORITY_USERINTERACTIVE = 0x08000;   
        const uint INFINITE = 0xffffffff;   
        const uint CONNMGR_STATUS_CONNECTED = 0x10;   
        static Hashtable ht = new Hashtable();   
        static GPRSConnection()   
        {   
            ManualResetEvent mre = new ManualResetEvent(false);   
            mre.Handle = ConnMgrApiReadyEvent();   
            mre.WaitOne();   
            CloseHandle(mre.Handle);   
        }   
        ~GPRSConnection()   
        {   
            ReleaseAll();   
        }   
        public static bool Setup(Uri url)   
        {   
            return Setup(url.ToString());   
        }   
        public static bool Setup(string urlStr)   
        {   
            ConnectionInfo ci = new ConnectionInfo();   
            IntPtr phConnection = IntPtr.Zero;   
            uint status = 0;  
            if (ht[urlStr] != null)  
            {  
                return true;  
            }  
            if (ConnMgrMapURL(urlStr, ref ci.guidDestNet, IntPtr.Zero) != S_OK)  
            {  
                return false;  
            }  
            ci.cbSize = (uint)Marshal.SizeOf(ci);   
            ci.dwParams = CONNMGR_PARAM_GUIDDESTNET;   
            ci.dwFlags = CONNMGR_FLAG_PROXY_HTTP;   
            ci.dwPriority = CONNMGR_PRIORITY_USERINTERACTIVE;   
            ci.bExclusive = 0;   
            ci.bDisabled = 0;   
            ci.hWnd = IntPtr.Zero;   
            ci.uMsg = 0;   
            ci.lParam = 0;  
            if (ConnMgrEstablishConnectionSync(ref ci, ref phConnection, INFINITE, ref status) != S_OK && status != CONNMGR_STATUS_CONNECTED)  
            {  
                return false;  
            }  
            ht[urlStr] = phConnection;   
            return true;   
        }   
        public static bool Release(Uri url)   
        {   
            return Release(url.ToString());   
        }   
        public static bool Release(string urlStr)   
        {   
            return Release(urlStr, true);   
        }   
        private static bool Release(string urlStr, bool removeNode)   
        {   
            bool res = true;   
            IntPtr ph = IntPtr.Zero;  
            if (ht[urlStr] == null)  
            {  
                return true;  
            }  
            ph = (IntPtr)ht[urlStr];  
            if (ConnMgrReleaseConnection(ph, 1) != S_OK)  
            {  
                res = false;  
            }  
            CloseHandle(ph);  
            if (removeNode)  
            {  
                ht.Remove(urlStr);  
            }  
            return res;   
        }   
        public static void ReleaseAll()   
        {   
            foreach (DictionaryEntry de in ht)   
            {   
                Release((string)de.Key, false);   
            }   
            ht.Clear();   
        }   
        [StructLayout(LayoutKind.Sequential)]    
        public struct ConnectionInfo   
        {   
            public uint cbSize;   
            public uint dwParams;   
            public uint dwFlags;   
            public uint dwPriority;   
            public int bExclusive;   
            public int bDisabled;   
            public Guid guidDestNet;   
            public IntPtr hWnd;   
            public uint uMsg;   
            public uint lParam;   
            public uint ulMaxCost;  
            public uint ulMinRcvBw;   
            public uint ulMaxConnLatency;          
        }   
        [DllImport("cellcore.dll")]         
        private static extern int ConnMgrMapURL(string pwszURL, ref Guid pguid, IntPtr pdwIndex);   
        [DllImport("cellcore.dll")]   
        private static extern int ConnMgrEstablishConnectionSync(ref ConnectionInfo ci, ref IntPtr phConnection, uint dwTimeout, ref uint pdwStatus);   
        [DllImport("cellcore.dll")] private static extern IntPtr ConnMgrApiReadyEvent();          
        [DllImport("cellcore.dll")] private static extern int ConnMgrReleaseConnection(IntPtr hConnection, int bCache);          
        [DllImport("coredll.dll")] private static extern int CloseHandle(IntPtr hObject);      
    }  
}  
  
e.g :  
GPRSConnection .Setup("http://www.microsoft.com");  
http://blog.csdn.net/ssihc0/article/details/5058054