class1.cs

windows mobile 系统上GPRS连接的创建和删除等功能的演示代码

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.Collections;
using System.Threading;

namespace GPRSState
{
	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);    
	}
}