Byte型CRC8校验算法使用
//******************************************************************************************* /* CRC余式表 */ const static crc_ta_Array[]={0x0, 0x0, 0x10, 0x21, 0x20, 0x42, 0x30, 0x63, 0x40, 0x84, 0x50, 0xA5, 0x60, 0xC6, 0x70, 0xE7, 0x81, 0x8, 0x91, 0x29, 0xA1, 0x4A, 0xB1, 0x6B, 0xC1, 0x8C, 0xD1, 0xAD, 0xE1, 0xCE, 0xF1, 0xEF, 0x12, 0x31, 0x2, 0x10, 0x32, 0x73, 0x22, 0x52, 0x52, 0xB5, 0x42, 0x94, 0x72, 0xF7, 0x62, 0xD6, 0x93, 0x39, 0x83, 0x18, 0xB3, 0x7B, 0xA3, 0x5A, 0xD3, 0xBD, 0xC3, 0x9C, 0xF3, 0xFF, 0xE3, 0xDE, 0x24, 0x62, 0x34, 0x43, 0x4, 0x20, 0x14, 0x1, 0x64, 0xE6, 0x74, 0xC7, 0x44, 0xA4, 0x54, 0x85, 0xA5, 0x6A, 0xB5, 0x4B, 0x85, 0x28, 0x95, 0x9, 0xE5, 0xEE, 0xF5, 0xCF, 0xC5, 0xAC, 0xD5, 0x8D, 0x36, 0x53, 0x26, 0x72, 0x16, 0x11, 0x6, 0x30, 0x76, 0xD7, 0x66, 0xF6, 0x56, 0x95, 0x46, 0xB4, 0xB7, 0x5B, 0xA7, 0x7A, 0x97, 0x19, 0x87, 0x38, 0xF7, 0xDF, 0xE7, 0xFE, 0xD7, 0x9D, 0xC7, 0xBC, 0x48, 0xC4, 0x58, 0xE5, 0x68, 0x86, 0x78, 0xA7, 0x8, 0x40, 0x18, 0x61, 0x28, 0x2, 0x38, 0x23, 0xC9, 0xCC, 0xD9, 0xED, 0xE9, 0x8E, 0xF9, 0xAF, 0x89, 0x48, 0x99, 0x69, 0xA9, 0xA, 0xB9, 0x2B, 0x5A, 0xF5, 0x4A, 0xD4, 0x7A, 0xB7, 0x6A, 0x96, 0x1A, 0x71, 0xA, 0x50, 0x3A, 0x33, 0x2A, 0x12, 0xDB, 0xFD, 0xCB, 0xDC, 0xFB, 0xBF, 0xEB, 0x9E, 0x9B, 0x79, 0x8B, 0x58, 0xBB, 0x3B, 0xAB, 0x1A, 0x6C, 0xA6, 0x7C, 0x87, 0x4C, 0xE4, 0x5C, 0xC5, 0x2C, 0x22, 0x3C, 0x3, 0xC, 0x60, 0x1C, 0x41, 0xED, 0xAE, 0xFD, 0x8F, 0xCD, 0xEC, 0xDD, 0xCD, 0xAD, 0x2A, 0xBD, 0xB, 0x8D, 0x68, 0x9D, 0x49, 0x7E, 0x97, 0x6E, 0xB6, 0x5E, 0xD5, 0x4E, 0xF4, 0x3E, 0x13, 0x2E, 0x32, 0x1E, 0x51, 0xE, 0x70, 0xFF, 0x9F, 0xEF, 0xBE, 0xDF, 0xDD, 0xCF, 0xFC, 0xBF, 0x1B, 0xAF, 0x3A, 0x9F, 0x59, 0x8F, 0x78, 0x91, 0x88, 0x81, 0xA9, 0xB1, 0xCA, 0xA1, 0xEB, 0xD1, 0xC, 0xC1, 0x2D, 0xF1, 0x4E, 0xE1, 0x6F, 0x10, 0x80, 0x0, 0xA1, 0x30, 0xC2, 0x20, 0xE3, 0x50, 0x4, 0x40, 0x25, 0x70, 0x46, 0x60, 0x67, 0x83, 0xB9, 0x93, 0x98, 0xA3, 0xFB, 0xB3, 0xDA, 0xC3, 0x3D, 0xD3, 0x1C, 0xE3, 0x7F, 0xF3, 0x5E, 0x2, 0xB1, 0x12, 0x90, 0x22, 0xF3, 0x32, 0xD2, 0x42, 0x35, 0x52, 0x14, 0x62, 0x77, 0x72, 0x56, 0xB5, 0xEA, 0xA5, 0xCB, 0x95, 0xA8, 0x85, 0x89, 0xF5, 0x6E, 0xE5, 0x4F, 0xD5, 0x2C, 0xC5, 0xD, 0x34, 0xE2, 0x24, 0xC3, 0x14, 0xA0, 0x4, 0x81, 0x74, 0x66, 0x64, 0x47, 0x54, 0x24, 0x44, 0x5, 0xA7, 0xDB, 0xB7, 0xFA, 0x87, 0x99, 0x97, 0xB8, 0xE7, 0x5F, 0xF7, 0x7E, 0xC7, 0x1D, 0xD7, 0x3C, 0x26, 0xD3, 0x36, 0xF2, 0x6, 0x91, 0x16, 0xB0, 0x66, 0x57, 0x76, 0x76, 0x46, 0x15, 0x56, 0x34, 0xD9, 0x4C, 0xC9, 0x6D, 0xF9, 0xE, 0xE9, 0x2F, 0x99, 0xC8, 0x89, 0xE9, 0xB9, 0x8A, 0xA9, 0xAB, 0x58, 0x44, 0x48, 0x65, 0x78, 0x6, 0x68, 0x27, 0x18, 0xC0, 0x8, 0xE1, 0x38, 0x82, 0x28, 0xA3, 0xCB, 0x7D, 0xDB, 0x5C, 0xEB, 0x3F, 0xFB, 0x1E, 0x8B, 0xF9, 0x9B, 0xD8, 0xAB, 0xBB, 0xBB, 0x9A, 0x4A, 0x75, 0x5A, 0x54, 0x6A, 0x37, 0x7A, 0x16, 0xA, 0xF1, 0x1A, 0xD0, 0x2A, 0xB3, 0x3A, 0x92, 0xFD, 0x2E, 0xED, 0xF, 0xDD, 0x6C, 0xCD, 0x4D, 0xBD, 0xAA, 0xAD, 0x8B, 0x9D, 0xE8, 0x8D, 0xC9, 0x7C, 0x26, 0x6C, 0x7, 0x5C, 0x64, 0x4C, 0x45, 0x3C, 0xA2, 0x2C, 0x83, 0x1C, 0xE0, 0xC, 0xC1, 0xEF, 0x1F, 0xFF, 0x3E, 0xCF, 0x5D, 0xDF, 0x7C, 0xAF, 0x9B, 0xBF, 0xBA, 0x8F, 0xD9, 0x9F, 0xF8, 0x6E, 0x17, 0x7E, 0x36, 0x4E, 0x55, 0x5E, 0x74, 0x2E, 0x93, 0x3E, 0xB2, 0xE, 0xD1, 0x1E, 0xF0}; //******************************************************************************************* //---------------------------------------------------------------------------- //计算长度为bytelength的byte型数组CRCBytes()的CRC long yb_crc(BYTE* CRCBytes,int bytelength ) { //BYTE crc_ta[512]; BYTE crc[2]; int i, j, k ; i = j = k = 0; crc[0] = 0; crc[1] = 0; j = 0; while (bytelength != 0) { bytelength--; k = crc[0]; crc[0] = crc[1]; crc[1] = 0; i = k ^ CRCBytes[j]; crc[0] = crc[0] ^ crc_ta_Array[i * 2]; crc[1] = crc_ta_Array[i * 2 + 1]; j = j + 1; } return crc[0] * 256 + crc[1]; } int main(int argc, char* argv[]) { LPBYTE lpGISBuff = NULL; int nBuffLen=512; lpGISBuff = new BYTE[nBuffLen]; memset(lpGISBuff,1,nBuffLen); //假设要发送的lpGISBuff内容为fwq123 memcpy(lpGISBuff,"fwq123",6); //求lpGISBuff的CRC码 long crc_code; crc_code = yb_crc(lpGISBuff,6); printf("The crc of lpGISBuff is %d/n", crc_code); //将CRC码放在要发送信息之后 //可以在此处加入便于于接收方识别的帧尾 sprintf((char*)(lpGISBuff+6),"%d",crc_code); printf("before add head lpGISBuff : %s/n", lpGISBuff); //计算加入CRC码后lpGISBuff的长度 for(int i=0;lpGISBuff[i]!=NULL;i++); printf("The len of lpGISBuff is %d /n", i); //为加入CRC码后字符串增加一个帧头，用于接收方识别。 memcpy(g_GisData,"SKGIS:",6);//加入帧头 memcpy(g_GisData+6,lpGISBuff,i+1); printf("The g_GisData is %s/n", g_GisData); printf("Hello World!/n"); return 0; }