SNTP客户端VC源程序，基于PJ Naughter

/* Module : SNTP.CPP Purpose: implementation for a MFC class to encapsulate the SNTP protocol Created: PJN / 05-08-1998 History: PJN / 16-11-1998 1. m_nOriginateTime was getting set incorrectly in the SNTP response 2. GetLastError now works when a timeout occurs. Copyright (c) 1998 by PJ Naughter. All rights reserved. */ ///////////////////////////////// Includes ////////////////////////////////// #include "stdafx.h" #include <math.h> #include "sntp.h" ///////////////////////////////// Macros / Locals /////////////////////////// #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif const double NTP_FRACTIONAL_TO_MS = (((double)1000.0)/0xFFFFFFFF); const double NTP_TO_SECOND = (((double)1.0)/0xFFFFFFFF); const long JAN_1ST_1900 = 2415021; //Lookup table to convert from Milliseconds (hence 1000 Entries) //to fractions of a second expressed as a DWORD DWORD CNtpTime::m_MsToNTP[1000] = { 0x00000000, 0x00418937, 0x0083126f, 0x00c49ba6, 0x010624dd, 0x0147ae14, 0x0189374c, 0x01cac083, 0x020c49ba, 0x024dd2f2, 0x028f5c29, 0x02d0e560, 0x03126e98, 0x0353f7cf, 0x03958106, 0x03d70a3d, 0x04189375, 0x045a1cac, 0x049ba5e3, 0x04dd2f1b, 0x051eb852, 0x05604189, 0x05a1cac1, 0x05e353f8, 0x0624dd2f, 0x06666666, 0x06a7ef9e, 0x06e978d5, 0x072b020c, 0x076c8b44, 0x07ae147b, 0x07ef9db2, 0x083126e9, 0x0872b021, 0x08b43958, 0x08f5c28f, 0x09374bc7, 0x0978d4fe, 0x09ba5e35, 0x09fbe76d, 0x0a3d70a4, 0x0a7ef9db, 0x0ac08312, 0x0b020c4a, 0x0b439581, 0x0b851eb8, 0x0bc6a7f0, 0x0c083127, 0x0c49ba5e, 0x0c8b4396, 0x0ccccccd, 0x0d0e5604, 0x0d4fdf3b, 0x0d916873, 0x0dd2f1aa, 0x0e147ae1, 0x0e560419, 0x0e978d50, 0x0ed91687, 0x0f1a9fbe, 0x0f5c28f6, 0x0f9db22d, 0x0fdf3b64, 0x1020c49c, 0x10624dd3, 0x10a3d70a, 0x10e56042, 0x1126e979, 0x116872b0, 0x11a9fbe7, 0x11eb851f, 0x122d0e56, 0x126e978d, 0x12b020c5, 0x12f1a9fc, 0x13333333, 0x1374bc6a, 0x13b645a2, 0x13f7ced9, 0x14395810, 0x147ae148, 0x14bc6a7f, 0x14fdf3b6, 0x153f7cee, 0x15810625, 0x15c28f5c, 0x16041893, 0x1645a1cb, 0x16872b02, 0x16c8b439, 0x170a3d71, 0x174bc6a8, 0x178d4fdf, 0x17ced917, 0x1810624e, 0x1851eb85, 0x189374bc, 0x18d4fdf4, 0x1916872b, 0x19581062, 0x1999999a, 0x19db22d1, 0x1a1cac08, 0x1a5e353f, 0x1a9fbe77, 0x1ae147ae, 0x1b22d0e5, 0x1b645a1d, 0x1ba5e354, 0x1be76c8b, 0x1c28f5c3, 0x1c6a7efa, 0x1cac0831, 0x1ced9168, 0x1d2f1aa0, 0x1d70a3d7, 0x1db22d0e, 0x1df3b646, 0x1e353f7d, 0x1e76c8b4, 0x1eb851ec, 0x1ef9db23, 0x1f3b645a, 0x1f7ced91, 0x1fbe76c9, 0x20000000, 0x20418937, 0x2083126f, 0x20c49ba6, 0x210624dd, 0x2147ae14, 0x2189374c, 0x21cac083, 0x220c49ba, 0x224dd2f2, 0x228f5c29, 0x22d0e560, 0x23126e98, 0x2353f7cf, 0x23958106, 0x23d70a3d, 0x24189375, 0x245a1cac, 0x249ba5e3, 0x24dd2f1b, 0x251eb852, 0x25604189, 0x25a1cac1, 0x25e353f8, 0x2624dd2f, 0x26666666, 0x26a7ef9e, 0x26e978d5, 0x272b020c, 0x276c8b44, 0x27ae147b, 0x27ef9db2, 0x283126e9, 0x2872b021, 0x28b43958, 0x28f5c28f, 0x29374bc7, 0x2978d4fe, 0x29ba5e35, 0x29fbe76d, 0x2a3d70a4, 0x2a7ef9db, 0x2ac08312, 0x2b020c4a, 0x2b439581, 0x2b851eb8, 0x2bc6a7f0, 0x2c083127, 0x2c49ba5e, 0x2c8b4396, 0x2ccccccd, 0x2d0e5604, 0x2d4fdf3b, 0x2d916873, 0x2dd2f1aa, 0x2e147ae1, 0x2e560419, 0x2e978d50, 0x2ed91687, 0x2f1a9fbe, 0x2f5c28f6, 0x2f9db22d, 0x2fdf3b64, 0x3020c49c, 0x30624dd3, 0x30a3d70a, 0x30e56042, 0x3126e979, 0x316872b0, 0x31a9fbe7, 0x31eb851f, 0x322d0e56, 0x326e978d, 0x32b020c5, 0x32f1a9fc, 0x33333333, 0x3374bc6a, 0x33b645a2, 0x33f7ced9, 0x34395810, 0x347ae148, 0x34bc6a7f, 0x34fdf3b6, 0x353f7cee, 0x35810625, 0x35c28f5c, 0x36041893, 0x3645a1cb, 0x36872b02, 0x36c8b439, 0x370a3d71, 0x374bc6a8, 0x378d4fdf, 0x37ced917, 0x3810624e, 0x3851eb85, 0x389374bc, 0x38d4fdf4, 0x3916872b, 0x39581062, 0x3999999a, 0x39db22d1, 0x3a1cac08, 0x3a5e353f, 0x3a9fbe77, 0x3ae147ae, 0x3b22d0e5, 0x3b645a1d, 0x3ba5e354, 0x3be76c8b, 0x3c28f5c3, 0x3c6a7efa, 0x3cac0831, 0x3ced9168, 0x3d2f1aa0, 0x3d70a3d7, 0x3db22d0e, 0x3df3b646, 0x3e353f7d, 0x3e76c8b4, 0x3eb851ec, 0x3ef9db23, 0x3f3b645a, 0x3f7ced91, 0x3fbe76c9, 0x40000000, 0x40418937, 0x4083126f, 0x40c49ba6, 0x410624dd, 0x4147ae14, 0x4189374c, 0x41cac083, 0x420c49ba, 0x424dd2f2, 0x428f5c29, 0x42d0e560, 0x43126e98, 0x4353f7cf, 0x43958106, 0x43d70a3d, 0x44189375, 0x445a1cac, 0x449ba5e3, 0x44dd2f1b, 0x451eb852, 0x45604189, 0x45a1cac1, 0x45e353f8, 0x4624dd2f, 0x46666666, 0x46a7ef9e, 0x46e978d5, 0x472b020c, 0x476c8b44, 0x47ae147b, 0x47ef9db2, 0x483126e9, 0x4872b021, 0x48b43958, 0x48f5c28f, 0x49374bc7, 0x4978d4fe, 0x49ba5e35, 0x49fbe76d, 0x4a3d70a4, 0x4a7ef9db, 0x4ac08312, 0x4b020c4a, 0x4b439581, 0x4b851eb8, 0x4bc6a7f0, 0x4c083127, 0x4c49ba5e, 0x4c8b4396, 0x4ccccccd, 0x4d0e5604, 0x4d4fdf3b, 0x4d916873, 0x4dd2f1aa, 0x4e147ae1, 0x4e560419, 0x4e978d50, 0x4ed91687, 0x4f1a9fbe, 0x4f5c28f6, 0x4f9db22d, 0x4fdf3b64, 0x5020c49c, 0x50624dd3, 0x50a3d70a, 0x50e56042, 0x5126e979, 0x516872b0, 0x51a9fbe7, 0x51eb851f, 0x522d0e56, 0x526e978d, 0x52b020c5, 0x52f1a9fc, 0x53333333, 0x5374bc6a, 0x53b645a2, 0x53f7ced9, 0x54395810, 0x547ae148, 0x54bc6a7f, 0x54fdf3b6, 0x553f7cee, 0x55810625, 0x55c28f5c, 0x56041893, 0x5645a1cb, 0x56872b02, 0x56c8b439, 0x570a3d71, 0x574bc6a8, 0x578d4fdf, 0x57ced917, 0x5810624e, 0x5851eb85, 0x589374bc, 0x58d4fdf4, 0x5916872b, 0x59581062, 0x5999999a, 0x59db22d1, 0x5a1cac08, 0x5a5e353f, 0x5a9fbe77, 0x5ae147ae, 0x5b22d0e5, 0x5b645a1d, 0x5ba5e354, 0x5be76c8b, 0x5c28f5c3, 0x5c6a7efa, 0x5cac0831, 0x5ced9168, 0x5d2f1aa0, 0x5d70a3d7, 0x5db22d0e, 0x5df3b646, 0x5e353f7d, 0x5e76c8b4, 0x5eb851ec, 0x5ef9db23, 0x5f3b645a, 0x5f7ced91, 0x5fbe76c9, 0x60000000, 0x60418937, 0x6083126f, 0x60c49ba6, 0x610624dd, 0x6147ae14, 0x6189374c, 0x61cac083, 0x620c49ba, 0x624dd2f2, 0x628f5c29, 0x62d0e560, 0x63126e98, 0x6353f7cf, 0x63958106, 0x63d70a3d, 0x64189375, 0x645a1cac, 0x649ba5e3, 0x64dd2f1b, 0x651eb852, 0x65604189, 0x65a1cac1, 0x65e353f8, 0x6624dd2f, 0x66666666, 0x66a7ef9e, 0x66e978d5, 0x672b020c, 0x676c8b44, 0x67ae147b, 0x67ef9db2, 0x683126e9, 0x6872b021, 0x68b43958, 0x68f5c28f, 0x69374bc7, 0x6978d4fe, 0x69ba5e35, 0x69fbe76d, 0x6a3d70a4, 0x6a7ef9db, 0x6ac08312, 0x6b020c4a, 0x6b439581, 0x6b851eb8, 0x6bc6a7f0, 0x6c083127, 0x6c49ba5e, 0x6c8b4396, 0x6ccccccd, 0x6d0e5604, 0x6d4fdf3b, 0x6d916873, 0x6dd2f1aa, 0x6e147ae1, 0x6e560419, 0x6e978d50, 0x6ed91687, 0x6f1a9fbe, 0x6f5c28f6, 0x6f9db22d, 0x6fdf3b64, 0x7020c49c, 0x70624dd3, 0x70a3d70a, 0x70e56042, 0x7126e979, 0x716872b0, 0x71a9fbe7, 0x71eb851f, 0x722d0e56, 0x726e978d, 0x72b020c5, 0x72f1a9fc, 0x73333333, 0x7374bc6a, 0x73b645a2, 0x73f7ced9, 0x74395810, 0x747ae148, 0x74bc6a7f, 0x74fdf3b6, 0x753f7cee, 0x75810625, 0x75c28f5c, 0x76041893, 0x7645a1cb, 0x76872b02, 0x76c8b439, 0x770a3d71, 0x774bc6a8, 0x778d4fdf, 0x77ced917, 0x7810624e, 0x7851eb85, 0x789374bc, 0x78d4fdf4, 0x7916872b, 0x79581062, 0x7999999a, 0x79db22d1, 0x7a1cac08, 0x7a5e353f, 0x7a9fbe77, 0x7ae147ae, 0x7b22d0e5, 0x7b645a1d, 0x7ba5e354, 0x7be76c8b, 0x7c28f5c3, 0x7c6a7efa, 0x7cac0831, 0x7ced9168, 0x7d2f1aa0, 0x7d70a3d7, 0x7db22d0e, 0x7df3b646, 0x7e353f7d, 0x7e76c8b4, 0x7eb851ec, 0x7ef9db23, 0x7f3b645a, 0x7f7ced91, 0x7fbe76c9, 0x80000000, 0x80418937, 0x8083126f, 0x80c49ba6, 0x810624dd, 0x8147ae14, 0x8189374c, 0x81cac083, 0x820c49ba, 0x824dd2f2, 0x828f5c29, 0x82d0e560, 0x83126e98, 0x8353f7cf, 0x83958106, 0x83d70a3d, 0x84189375, 0x845a1cac, 0x849ba5e3, 0x84dd2f1b, 0x851eb852, 0x85604189, 0x85a1cac1, 0x85e353f8, 0x8624dd2f, 0x86666666, 0x86a7ef9e, 0x86e978d5, 0x872b020c, 0x876c8b44, 0x87ae147b, 0x87ef9db2, 0x883126e9, 0x8872b021, 0x88b43958, 0x88f5c28f, 0x89374bc7, 0x8978d4fe, 0x89ba5e35, 0x89fbe76d, 0x8a3d70a4, 0x8a7ef9db, 0x8ac08312, 0x8b020c4a, 0x8b439581, 0x8b851eb8, 0x8bc6a7f0, 0x8c083127, 0x8c49ba5e, 0x8c8b4396, 0x8ccccccd, 0x8d0e5604, 0x8d4fdf3b, 0x8d916873, 0x8dd2f1aa, 0x8e147ae1, 0x8e560419, 0x8e978d50, 0x8ed916