unit1.cpp

C++ BUILDER 写的CRC校验码程序！CRCC（X16+X12+X5+1）

//---------------------------------------------------------------------------

#include <vcl.h>
#pragma hdrstop

#include "Unit1.h"
#include "stdio.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
#define INIT 0x0000
#define POLINOMIAL 0x1021

unsigned short calc_crc(unsigned short crc,unsigned short ch);
unsigned short GetCRC(unsigned char *p,unsigned short n);

unsigned short calc_crc(unsigned short crc,unsigned short ch)
{
unsigned short i;
ch<<=8;
for(i=8;i>0;i--){

 if ((ch ^crc)&0x8000){
  crc=(crc<<1)^POLINOMIAL;
  }
else  {
  crc<<=1;
}
ch<<=1;
}
return crc;
}

unsigned short GetCRC(unsigned char *p,unsigned short n)
{
unsigned char ch;
unsigned short i;
unsigned short crc=INIT;
for(i=0;i<n;i++){
ch=*p++;
crc=calc_crc(crc,(unsigned short)ch);

}
return crc;
}

TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------

  void __fastcall TForm1::Button1Click(TObject *Sender)
  {
  /*
  stx:f2h
  len:00 08h;
  text(C0032400)
  */
  
  //AnsiString str =Edit1->Text;
  //0xF2,0x00,0x08,0x43,0x30,0x30,0x33,0x32,0x34,0x30,0x30,0x00,0x00
 // unsigned char TransCommand[13]={0xF2,0x00,0x08,0x43,0x30,0x30,0x33,0x32,0x34,0x30,0x30,0x00,0x00};
 // unsigned char TransCommand[13]={0xF2,0x00,0x08,0x43,0x32,0x30,0x00,0x00,0x00,0x00,0x00};
 // unsigned char TransCommand[13]={0xF2,0x00,0x08,0x43,0x41,0x30,0x00,0x00,0x00,0x00,0x00};

  unsigned char TransCommand[6]={0xF2,0x00,0x03,0x43,0x49,0x42};
  unsigned short TextLength =6 ;
  unsigned short crc;
  crc=GetCRC(TransCommand,TextLength);
  TransCommand[4]=(crc>>8)&0xFF;
  TransCommand[5]=crc&0xFF;

//  unsigned char TransCommand[7]={0xF2,0x00,0x04,0x43,0x49,0x40,0x36};
//  unsigned short TextLength = 7;
//  unsigned short crc;
//  crc=GetCRC(TransCommand,TextLength);
//  TransCommand[5]=(crc>>8)&0xFF;
//  TransCommand[6]=crc&0xFF;

  Edit2->Text=crc;
  return ;
  }
//---------------------------------------------------------------------------