MFC读写普通文件

    char read[256]={0};     char write[256]={0};        int line = 0, spxLen, onePiece, i;    long poscode = 0;     CFile fileR("D:\\123.txt" ,CFile::modeRead);    CFile fileW("D:\\456.txt" , CFile::modeCreate | CFile::modeWrite);      spxLen = fileR.GetLength();    fileW.Seek(0, CFile::begin);    fileR.Read(read,10);     for (i=0 ;i<8; i++ ){        if (read[2+i]>= 'A')            read[2+i] = read[2+i] -'A' + 10;        else            read[2+i] = read[2+i] -'0';        poscode = (poscode<<4) + read[2+i];    }    memset(write,0, sizeof(write));    sprintf_s(write, "设备:0-74,区域:0,终端编号:0x00%08x,开始地址:0x00000000,结束地址:0x%08x,目录长度:0x00000000",        poscode,spxLen/2);       i = strlen(write);    write[i] = 0xA;        fileW.Write(write, (i+1));      while(spxLen > 0)    {        fileR.Seek(line*2*0x40,CFile::begin);        //fileW.Seek((line*0x80+12),CFile::current);        if (spxLen >= 0x80){            onePiece = 0x80;            spxLen -= 0x80;        }        else{                                    onePiece = spxLen;            spxLen = 0;        }        sprintf_s(write, "0x%08x", line*0x40);        write[10] = ':';        fileR.Read(read,onePiece);        memcpy(write+11, read, onePiece);        write[11+onePiece] = 0xA;        line ++;        fileW.Write(write, (11+onePiece+1));    }     fileW.Close();