gprs 自动拨号 wince ppc

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.

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");