记录一段计算CRC16校验码的代码
是Unicode环境运行成功的，以前那个是多字节，用起来不爽又改了一下
1 const unsigned short crc16_ccitt_table[256] = 2 { 3 0x0000, 0xc0c1, 0xc181, 0x0140, 0xc301, 0x03c0, 0x0280, 0xc241, 4 0xc601, 0x06c0, 0x0780, 0xc741, 0x0500, 0xc5c1, 0xc481, 0x0440, 5 0xcc01, 0x0cc0, 0x0d80, 0xcd41, 0x0f00, 0xcfc1, 0xce81, 0x0e40, 6 0x0a00, 0xcac1, 0xcb81, 0x0b40, 0xc901, 0x09c0, 0x0880, 0xc841, 7 0xd801, 0x18c0, 0x1980, 0xd941, 0x1b00, 0xdbc1, 0xda81, 0x1a40, 8 0x1e00, 0xdec1, 0xdf81, 0x1f40, 0xdd01, 0x1dc0, 0x1c80, 0xdc41, 9 0x1400, 0xd4c1, 0xd581, 0x1540, 0xd701, 0x17c0, 0x1680, 0xd641, 10 0xd201, 0x12c0, 0x1380, 0xd341, 0x1100, 0xd1c1, 0xd081, 0x1040, 11 0xf001, 0x30c0, 0x3180, 0xf141, 0x3300, 0xf3c1, 0xf281, 0x3240, 12 0x3600, 0xf6c1, 0xf781, 0x3740, 0xf501, 0x35c0, 0x3480, 0xf441, 13 0x3c00, 0xfcc1, 0xfd81, 0x3d40, 0xff01, 0x3fc0, 0x3e80, 0xfe41, 14 0xfa01, 0x3ac0, 0x3b80, 0xfb41, 0x3900, 0xf9c1, 0xf881, 0x3840, 15 0x2800, 0xe8c1, 0xe981, 0x2940, 0xeb01, 0x2bc0, 0x2a80, 0xea41, 16 0xee01, 0x2ec0, 0x2f80, 0xef41, 0x2d00, 0xedc1, 0xec81, 0x2c40, 17 0xe401, 0x24c0, 0x2580, 0xe541, 0x2700, 0xe7c1, 0xe681, 0x2640, 18 0x2200, 0xe2c1, 0xe381, 0x2340, 0xe101, 0x21c0, 0x2080, 0xe041, 19 0xa001, 0x60c0, 0x6180, 0xa141, 0x6300, 0xa3c1, 0xa281, 0x6240, 20 0x6600, 0xa6c1, 0xa781, 0x6740, 0xa501, 0x65c0, 0x6480, 0xa441, 21 0x6c00, 0xacc1, 0xad81, 0x6d40, 0xaf01, 0x6fc0, 0x6e80, 0xae41, 22 0xaa01, 0x6ac0, 0x6b80, 0xab41, 0x6900, 0xa9c1, 0xa881, 0x6840, 23 0x7800, 0xb8c1, 0xb981, 0x7940, 0xbb01, 0x7bc0, 0x7a80, 0xba41, 24 0xbe01, 0x7ec0, 0x7f80, 0xbf41, 0x7d00, 0xbdc1, 0xbc81, 0x7c40, 25 0xb401, 0x74c0, 0x7580, 0xb541, 0x7700, 0xb7c1, 0xb681, 0x7640, 26 0x7200, 0xb2c1, 0xb381, 0x7340, 0xb101, 0x71c0, 0x7080, 0xb041, 27 0x5000, 0x90c1, 0x9181, 0x5140, 0x9301, 0x53c0, 0x5280, 0x9241, 28 0x9601, 0x56c0, 0x5780, 0x9741, 0x5500, 0x95c1, 0x9481, 0x5440, 29 0x9c01, 0x5cc0, 0x5d80, 0x9d41, 0x5f00, 0x9fc1, 0x9e81, 0x5e40, 30 0x5a00, 0x9ac1, 0x9b81, 0x5b40, 0x9901, 0x59c0, 0x5880, 0x9841, 31 0x8801, 0x48c0, 0x4980, 0x8941, 0x4b00, 0x8bc1, 0x8a81, 0x4a40, 32 0x4e00, 0x8ec1, 0x8f81, 0x4f40, 0x8d01, 0x4dc0, 0x4c80, 0x8c41, 33 0x4400, 0x84c1, 0x8581, 0x4540, 0x8701, 0x47c0, 0x4680, 0x8641, 34 0x8201, 0x42c0, 0x4380, 0x8341, 0x4100, 0x81c1, 0x8081, 0x4040 35 }; 36 37 38 unsigned short CtcpmodbusDlg::CRC16Algorithm(unsigned char *buffer, int len)//crc函数得到10进制数 39 { 40 if (buffer && len > 0) 41 { 42 unsigned short crc_value = 0xFFFF; 43 while (len--) 44 { 45 crc_value = (crc_value >> 8) ^ crc16_ccitt_table[(crc_value ^ *buffer++) & 0xff]; 46 } 47 return (unsigned short)(crc_value); 48 } 49 return 0; 50 } 51 52 53 int CtcpmodbusDlg::Str2UnsignedChar(CString str, unsigned char *buff)//把cstring类型转换为byte[]类型 54 { 55 char arr[256]; 56 int n = str.GetLength(); //获取str的字符数 57 int len = WideCharToMultiByte(CP_ACP, 0, str, n, NULL, 0, NULL, NULL); 58 WideCharToMultiByte(CP_ACP, 0, str, n, arr, len, NULL, NULL); 59 arr[len + 1] = ' '; 60 61 int count = 0; 62 char cTemp, xTemp; 63 64 int arrLen = strlen(arr); 65 for (int i = 0; i < arrLen; i++) 66 { 67 cTemp = arr[i]; 68 if (cTemp >= '0' && cTemp <= '9') 69 { 70 xTemp = cTemp - '0'; 71 } 72 else if (cTemp >= 'a' && cTemp <= 'f') 73 { 74 xTemp = cTemp - 'a' + 10; 75 } 76 else if (cTemp >= 'A' && cTemp <= 'F') 77 { 78 xTemp = cTemp - 'A' + 10; 79 } 80 else 81 { 82 continue;//空格过滤掉 83 } 84 if (!(count % 2)) 85 { 86 buff[count / 2] = (xTemp << 4); 87 } 88 else 89 { 90 buff[count / 2] |= xTemp; 91 } 92 count++; 93 } 94 return count / 2; 95 } 96 97 //调用方法 98 CString str = _T("01 10 00 50 00 0e"); 99 CString m_crc; 100 BYTE buff[6];//一共6个数 101 Str2UnsignedChar(str, buff); 102 WORD wCRC = CRC16Algorithm(buff, 6); 103 m_crc.Format(_T("%X"), wCRC); 104 AfxMessageBox(m_crc); //DC41