怎么用C语言编写对文件作奇偶校验的程序

neo_yl

有哪位高手知道怎么用C语言编写对文件作奇偶校验的程序？？

ksc

main()
{
int         i=0,j=0;
int         get,flag;
int         result;
int         length;
DWORD       index[5]={0,0,0,0,0};

/* 設定 com port 的初始狀態 */
result = init_com_port(com_port1);

/*** Write Buffer ***/
OutBuf[1] = 0x01;
OutBuf[2] = 0x00;
OutBuf[3] = 0x00;
OutBuf[4] = 0x01;
OutBuf[5] = 0x00;

flag=0;i=1;
while(i=1)
{  
  //First Station
  OutBuf[0] = 0x01;
  CRC16(OutBuf,6);
  // 先將要輸出的資料放在 OutBuf
  Sleep(DELAY_TINE);
  write_to_com(com_port1);
  // 讀到的資料在 InBuf
  Sleep(DELAY_TINE);
  index[0]=read_from_com(com_port1,0);

  //Second Station
  OutBuf[0] = 0x02;
  CRC16(OutBuf,6);
  // 先將要輸出的資料放在 OutBuf
  Sleep(DELAY_TINE);
  write_to_com(com_port1);
  //讀到的資料在 InBuf
  Sleep(DELAY_TINE);
  index[1]=read_from_com(com_port1,index[0]);
  
  //Third Station
  //OutBuf[0] = 0x03;
  //CRC16(OutBuf,6);
  // 先將要輸出的資料放在 OutBuf
  //Sleep(DELAY_TINE);
  //write_to_com(com_port1);
  // 讀到的資料在 InBuf
  //Sleep(DELAY_TINE);
  //index[2]=read_from_com(com_port1,index[1]);
  
  //Fourth Station
  //OutBuf[0] = 0x04;
  //CRC16(OutBuf,6);
  // 先將要輸出的資料放在 OutBuf
  //Sleep(DELAY_TINE);
  //write_to_com(com_port1);
  // 讀到的資料在 InBuf
  //Sleep(DELAY_TINE);
  //index[3]=read_from_com(com_port1,index[2]);

  //Fiveth Station
  //OutBuf[0] = 0x05;
  //CRC16(OutBuf,6);
  // 先將要輸出的資料放在 OutBuf
  //Sleep(DELAY_TINE);
  //write_to_com(com_port1);
  // 讀到的資料在 InBuf
  //Sleep(DELAY_TINE);
  //index[4]=read_from_com(com_port1,index[3]);

  //Assign Read PLC data to OldBuf
  if(flag==0)
  {
     for(j=0;j<REAL_LENGTH;j++)
             OldBuf[j]=InBuf[j];
     //Initial write read data to file
     length=index[0]+index[1]+index[2]+index[3]+index[4];
     ofstream outfile(FILE_PATH);
     for(j=0;j<length;j++)
             outfile<<InBuf[j];
          outfile.close;
     cout<<"\nWrite File To Save OK\n";
         flag++;
  }

  //if OldBuf not equail InBuf then write data to File
  WRITE_FILE_FLAG=0;
  for(j=0;j<REAL_LENGTH;j++)
          if(OldBuf[j]!=InBuf[j])
          {
         WRITE_FILE_FLAG=1;
         OldBuf[j]=InBuf[j];
      }

  //Write read data to file
  if(WRITE_FILE_FLAG==1)
  {
     length=index[0]+index[1]+index[2]+index[3]+index[4];
     ofstream outfile(FILE_PATH);
     for(j=0;j<length;j++)
             outfile<<InBuf[j];
         outfile.close;
     cout<<"\nWrite File To Save OK\n";
  }
  
  //Exit Program
  if(kbhit())
  {
         get=0;
     get=getch();
     if(get == 0)get=getch();
     if(get == ESC ) break;
  }

} // while loop

}   /*** End of main ***/


/******************************************************
*** Function Name : CRC16                          ***
*** Function Descr: Cyclic Redundancy Check        ***
*** Remark                                         ***
******************************************************/
CRC16(unsigned char buf[], int lgn)
{
unsigned char   parity_tab[8] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80};
unsigned char   bbl, ddl, bbh, ddh, tt, tt1, tt2;
int             i, j;

lgn+=2 ;
bbl = 0xff;
ddl = 0xff;
bbh = 0xff;
ddh = 0xff;

for (i = 0; i < lgn - 2; i++)
     {
      tt = buf;
      bbl = bbl ^ bbl;
      ddl = ddl ^ tt;
      tt2 = 0;
      for (j = 0; j < 8; j++)
          {
           if ((ddl &amp; parity_tab[j]) != 0)
               tt2 += 1;
          }
      if ((tt2 &amp; 0x01) != 0)
          bbl = 0x07;

      bbh = ddl;

      if ((bbl &amp; 0x01) != 0)
          tt = 1;
      else
          tt = 0;
      if ((bbh &amp; 0x01) != 0)
          tt1 = 1;
     else
          tt1 = 0;

     bbh = bbh >;>; 1;
     bbl = bbl >;>; 1;

     if (tt == 1)
         bbh = bbh | 0x80;
     if (tt1 == 1)
         bbl = bbl | 0x80;
     bbh = bbh ^ ddl;
     if ((bbl &amp; 0x01) != 0)
         tt = 1;
     else
         tt = 0;
     if ((bbh &amp; 0x01) != 0)
          tt1 = 1;
     else
          tt1 = 0;
     bbh = bbh >;>; 1;
     bbl = bbl >;>; 1;
     if (tt == 1)
         bbh = bbh | 0x80;
     if (tt1 == 1)
         bbl = bbl | 0x80;
     bbl = bbl ^ ddh;
     ddl = bbl;
     ddh = bbh;
    }
buf[lgn - 2] = ddl;
buf[lgn - 1] = ddh;
} /*** End of CRC16 ***/

陶深

文件奇偶校证 是什么意思？
本人对c程序的buffer编写不懂（如设置
/*** Write Buffer ***/
OutBuf[1] = 0x01;
OutBuf[2] = 0x00;
OutBuf[3] = 0x00;
OutBuf[4] = 0x01;
OutBuf[5] = 0x00;
）
推荐些书，或解释一下