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궁금이 님이 쓰신 글 :
: 자료실에서 소스를 받아서
: ==================================================== 헤더 파일에 넣은부분입니다
: extern const unsigned long Crc32Table[256];
:
: #define _EXTERN extern "C"
:
: #endif
:
: #define UPDC32(octet,crc) (Crc32Table[((crc) ^ (octet)) & 0xff] ^ ((crc) >> 8))
:
: _EXTERN unsigned long Crc32(unsigned char *Data, unsigned long Len);
:
: ===================================================== Cpp 파일에 넣은 부분입니다.
: const unsigned long Crc32Table[256] = {
: 0x00000000UL, 0x77073096UL, 0xee0e612cUL, 0x990951baUL, 0x076dc419UL, 0x706af48fUL, 0xe963a535UL, 0x9e6495a3UL,
: 0x0edb8832UL, 0x79dcb8a4UL, 0xe0d5e91eUL, 0x97d2d988UL, 0x09b64c2bUL, 0x7eb17cbdUL, 0xe7b82d07UL, 0x90bf1d91UL,
: 0x1db71064UL, 0x6ab020f2UL, 0xf3b97148UL, 0x84be41deUL, 0x1adad47dUL, 0x6ddde4ebUL, 0xf4d4b551UL, 0x83d385c7UL,
: 0x136c9856UL, 0x646ba8c0UL, 0xfd62f97aUL, 0x8a65c9ecUL, 0x14015c4fUL, 0x63066cd9UL, 0xfa0f3d63UL, 0x8d080df5UL,
: 0x3b6e20c8UL, 0x4c69105eUL, 0xd56041e4UL, 0xa2677172UL, 0x3c03e4d1UL, 0x4b04d447UL, 0xd20d85fdUL, 0xa50ab56bUL,
: 0x35b5a8faUL, 0x42b2986cUL, 0xdbbbc9d6UL, 0xacbcf940UL, 0x32d86ce3UL, 0x45df5c75UL, 0xdcd60dcfUL, 0xabd13d59UL,
: 0x26d930acUL, 0x51de003aUL, 0xc8d75180UL, 0xbfd06116UL, 0x21b4f4b5UL, 0x56b3c423UL, 0xcfba9599UL, 0xb8bda50fUL,
: 0x2802b89eUL, 0x5f058808UL, 0xc60cd9b2UL, 0xb10be924UL, 0x2f6f7c87UL, 0x58684c11UL, 0xc1611dabUL, 0xb6662d3dUL,
: 0x76dc4190UL, 0x01db7106UL, 0x98d220bcUL, 0xefd5102aUL, 0x71b18589UL, 0x06b6b51fUL, 0x9fbfe4a5UL, 0xe8b8d433UL,
: 0x7807c9a2UL, 0x0f00f934UL, 0x9609a88eUL, 0xe10e9818UL, 0x7f6a0dbbUL, 0x086d3d2dUL, 0x91646c97UL, 0xe6635c01UL,
: 0x6b6b51f4UL, 0x1c6c6162UL, 0x856530d8UL, 0xf262004eUL, 0x6c0695edUL, 0x1b01a57bUL, 0x8208f4c1UL, 0xf50fc457UL,
: 0x65b0d9c6UL, 0x12b7e950UL, 0x8bbeb8eaUL, 0xfcb9887cUL, 0x62dd1ddfUL, 0x15da2d49UL, 0x8cd37cf3UL, 0xfbd44c65UL,
: 0x4db26158UL, 0x3ab551ceUL, 0xa3bc0074UL, 0xd4bb30e2UL, 0x4adfa541UL, 0x3dd895d7UL, 0xa4d1c46dUL, 0xd3d6f4fbUL,
: 0x4369e96aUL, 0x346ed9fcUL, 0xad678846UL, 0xda60b8d0UL, 0x44042d73UL, 0x33031de5UL, 0xaa0a4c5fUL, 0xdd0d7cc9UL,
: 0x5005713cUL, 0x270241aaUL, 0xbe0b1010UL, 0xc90c2086UL, 0x5768b525UL, 0x206f85b3UL, 0xb966d409UL, 0xce61e49fUL,
: 0x5edef90eUL, 0x29d9c998UL, 0xb0d09822UL, 0xc7d7a8b4UL, 0x59b33d17UL, 0x2eb40d81UL, 0xb7bd5c3bUL, 0xc0ba6cadUL,
: 0xedb88320UL, 0x9abfb3b6UL, 0x03b6e20cUL, 0x74b1d29aUL, 0xead54739UL, 0x9dd277afUL, 0x04db2615UL, 0x73dc1683UL,
: 0xe3630b12UL, 0x94643b84UL, 0x0d6d6a3eUL, 0x7a6a5aa8UL, 0xe40ecf0bUL, 0x9309ff9dUL, 0x0a00ae27UL, 0x7d079eb1UL,
: 0xf00f9344UL, 0x8708a3d2UL, 0x1e01f268UL, 0x6906c2feUL, 0xf762575dUL, 0x806567cbUL, 0x196c3671UL, 0x6e6b06e7UL,
: 0xfed41b76UL, 0x89d32be0UL, 0x10da7a5aUL, 0x67dd4accUL, 0xf9b9df6fUL, 0x8ebeeff9UL, 0x17b7be43UL, 0x60b08ed5UL,
: 0xd6d6a3e8UL, 0xa1d1937eUL, 0x38d8c2c4UL, 0x4fdff252UL, 0xd1bb67f1UL, 0xa6bc5767UL, 0x3fb506ddUL, 0x48b2364bUL,
: 0xd80d2bdaUL, 0xaf0a1b4cUL, 0x36034af6UL, 0x41047a60UL, 0xdf60efc3UL, 0xa867df55UL, 0x316e8eefUL, 0x4669be79UL,
: 0xcb61b38cUL, 0xbc66831aUL, 0x256fd2a0UL, 0x5268e236UL, 0xcc0c7795UL, 0xbb0b4703UL, 0x220216b9UL, 0x5505262fUL,
: 0xc5ba3bbeUL, 0xb2bd0b28UL, 0x2bb45a92UL, 0x5cb36a04UL, 0xc2d7ffa7UL, 0xb5d0cf31UL, 0x2cd99e8bUL, 0x5bdeae1dUL,
: 0x9b64c2b0UL, 0xec63f226UL, 0x756aa39cUL, 0x026d930aUL, 0x9c0906a9UL, 0xeb0e363fUL, 0x72076785UL, 0x05005713UL,
: 0x95bf4a82UL, 0xe2b87a14UL, 0x7bb12baeUL, 0x0cb61b38UL, 0x92d28e9bUL, 0xe5d5be0dUL, 0x7cdcefb7UL, 0x0bdbdf21UL,
: 0x86d3d2d4UL, 0xf1d4e242UL, 0x68ddb3f8UL, 0x1fda836eUL, 0x81be16cdUL, 0xf6b9265bUL, 0x6fb077e1UL, 0x18b74777UL,
: 0x88085ae6UL, 0xff0f6a70UL, 0x66063bcaUL, 0x11010b5cUL, 0x8f659effUL, 0xf862ae69UL, 0x616bffd3UL, 0x166ccf45UL,
: 0xa00ae278UL, 0xd70dd2eeUL, 0x4e048354UL, 0x3903b3c2UL, 0xa7672661UL, 0xd06016f7UL, 0x4969474dUL, 0x3e6e77dbUL,
: 0xaed16a4aUL, 0xd9d65adcUL, 0x40df0b66UL, 0x37d83bf0UL, 0xa9bcae53UL, 0xdebb9ec5UL, 0x47b2cf7fUL, 0x30b5ffe9UL,
: 0xbdbdf21cUL, 0xcabac28aUL, 0x53b39330UL, 0x24b4a3a6UL, 0xbad03605UL, 0xcdd70693UL, 0x54de5729UL, 0x23d967bfUL,
: 0xb3667a2eUL, 0xc4614ab8UL, 0x5d681b02UL, 0x2a6f2b94UL, 0xb40bbe37UL, 0xc30c8ea1UL, 0x5a05df1bUL, 0x2d02ef8dUL
: };
:
:
:
: //==============================================================================
: unsigned long Crc32(unsigned char *Data, unsigned long Len)
: {
: register unsigned long crc32 = 0xFFFFFFFFUL;
: while(Len--) {
: crc32 = UPDC32(*Data,crc32);
: Data++;
: }
: return(~crc32);
: } // Crc32()
: //---------------------------------------------------------------------------
: void __fastcall TDataModuleComm::SendAVMtxCmd(TMedia Media, int InNo, int OutNo)
: {
: TProtocolFrame Frame;
:
: // AC 56 78 AB 01 00 02 00 00 E5 68 1D A8
: AnsiString Str;
: unsigned char buff [20];
: unsigned long CRC = 0;
:
: buff[0] = Char(0xAC);
: buff[1] += Char(0x56);
: buff[2] += Char(0x78);
: buff[3] += Char(0xAB);
: buff[4] += Char(0x01);
: buff[5] += Char(0x00);
: buff[6] += Char(0x02);
: buff[7] += Char(InNo-1);
: buff[8] += Char(OutNo-1);
:
: CRC = Crc32(buff, 9);
:
: Str = Char(0xAC);
: Str += Char(0x56);
: Str += Char(0x78);
: Str += Char(0xAB);
: Str += Char(0x01);
: Str += Char(0x00);
: Str += Char(0x02);
: Str += Char(InNo-1);
: Str += Char(OutNo-1);
:
: Str += CRC;
:
: Frame.SetCmd((BYTE *)Str.c_str(), Str.Length());
: // Frame.SetCmd(buff, 13);
: SendCmd(adrAVMtx, Frame, true, 300);
: SendDelay(adrAVMtx, 300);
: }
:
: 이렇게 했는데요... crc 가 이상하게 나와요,,, ㅠㅠ
:
: AC 56 78 AB 01 00 02 00 00 <-- 이렇게 헥사값을 넣으면 CRC 가 E5 68 1D A8 이렇게 4 바이트가 나와야하는데요...
: 이상한 값이 4바이트 더 붙어서 8바이트나 나오는데 값도 이상하고 제가 형 변환을 제대로 못해서 그런걸까요?? ㅠㅠ 도와주세요~
:
:
답변:
buff 가 스텍에서 0으로 초기화 되어있지 않은 가베지 값들인데, 무턱대고 buff[] += value 로 합니까
BYTE buff [20];
unsigned long CRC = 0;
buff[0] = 0xAC;
buff[1] = 0x56;
buff[2] = 0x78;
buff[3] = 0xAB;
buff[4] = 0x01;
buff[5] = 0x00;
buff[6] = 0x02;
buff[7] = 0; //InNo;
buff[8] = 0; //OutNo;
CRC = Crc32(buff, 9);
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