下面是正确的java示例的代码.....
我用 2b 00 01 00 0a 去算, 得出来的算CRC的结果:D1C1
用其他算CRC16的工具算出来也是D1C1
可我在网上找的代码,算出来的结果都不对..........JAVA代码:
/**MJCOM的CRC16算法实现
* @param buf CRC16的数据源
* @return CRC16的结果(只有16位有效)
*/
public static int mjComCRC(byte buf[]) {
int len = buf.length;
int crc,chr,i,j;
crc = 0xffff;
for(j=0; j<len; ++j){
chr = buf[j] & 0xff;
crc ^= chr;
for(i=0;i<8;i++) {
if ((crc & 01)!=0)
crc = (crc>>1)^0xa001;
else
crc = crc>>1;
}
crc &= 0xffff;
}
return crc;
}要求:
在一个edit1.text内填入 2b 00 01 00 0a 算出来后在 edit2.text内显示出结果 D1C1........
急....谢谢!!!!!!
我用 2b 00 01 00 0a 去算, 得出来的算CRC的结果:D1C1
用其他算CRC16的工具算出来也是D1C1
可我在网上找的代码,算出来的结果都不对..........JAVA代码:
/**MJCOM的CRC16算法实现
* @param buf CRC16的数据源
* @return CRC16的结果(只有16位有效)
*/
public static int mjComCRC(byte buf[]) {
int len = buf.length;
int crc,chr,i,j;
crc = 0xffff;
for(j=0; j<len; ++j){
chr = buf[j] & 0xff;
crc ^= chr;
for(i=0;i<8;i++) {
if ((crc & 01)!=0)
crc = (crc>>1)^0xa001;
else
crc = crc>>1;
}
crc &= 0xffff;
}
return crc;
}要求:
在一个edit1.text内填入 2b 00 01 00 0a 算出来后在 edit2.text内显示出结果 D1C1........
急....谢谢!!!!!!
var
i,j: Integer;
chr: Word;
begin
Result := $ffff;
for j:=0 to len-1 do begin
chr := PByte(LongWord(buf)+j)^ and $ff;
Result := Result xor chr;
for i:=0 to 8 -1 do begin
if ((Result and 01)<>0) then
Result := (Result shr 1) xor $a001
else
Result := Result shr 1;
end;
Result := Result and $ffff;
end;
end;
str: String;begin
str := #$2b#$00#$01#$00#$0a;
ShowMessage(IntToHex(mjComCRC(PByte(str),Length(str)),2));
end;结果是:C1D1(Word字节序问题)uses winsock;
var
str: String;begin
str := #$2b#$00#$01#$00#$0a;
ShowMessage(IntToHex(htons(mjComCRC(PByte(str),Length(str))),2));
end;var
str: String;
Ret: Word;
begin
str := #$2b#$00#$01#$00#$0a;
Ret := mjComCRC(PByte(str),Length(str));
SetLength(Str,sizeof(Ret) * 2);
BinToHex(PChar(@Ret),PChar(Str),sizeof(ret));
ShowMessage(str);
end;
我输入 2b0001000a 得出来的结果为:38129我的代码为:procedure TForm1.Button3Click(Sender: TObject);
begin
edit6.Text:=inttostr(mjComCRC11(Pbyte(edit5.Text),Length(edit5.Text)));
end;
var
str: String;
Ret: Word;
mybyte:pchar;
begin
HexToBin(pChar(Edit5.Text),@mybyte,Length(Edit2.Text));
Ret := mjComCRC11(pbyte(mybyte),sizeof(mybyte));
GetMem(mybyte,sizeof(Ret) * 2);
BinToHex(PChar(@Ret),PChar(mybyte),sizeof(ret));
ShowMessage(mybyte);
end;我改成这样子之后,返回值变成了 D020
我就不翻成PASCAL了,留着做参考吧.(里面的代码我做过程序验证过了,能得到C1D1)
==============================================================================const BYTE chCRCHTalbe[] = // CRC 高位字节值表 CRC16计算方法1:使用2个256长度的校验表
{
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40
};const BYTE chCRCLTalbe[] = // CRC 低位字节值表
{
0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06, 0x07, 0xC7,
0x05, 0xC5, 0xC4, 0x04, 0xCC, 0x0C, 0x0D, 0xCD, 0x0F, 0xCF, 0xCE, 0x0E,
0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09, 0x08, 0xC8, 0xD8, 0x18, 0x19, 0xD9,
0x1B, 0xDB, 0xDA, 0x1A, 0x1E, 0xDE, 0xDF, 0x1F, 0xDD, 0x1D, 0x1C, 0xDC,
0x14, 0xD4, 0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6, 0xD2, 0x12, 0x13, 0xD3,
0x11, 0xD1, 0xD0, 0x10, 0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3, 0xF2, 0x32,
0x36, 0xF6, 0xF7, 0x37, 0xF5, 0x35, 0x34, 0xF4, 0x3C, 0xFC, 0xFD, 0x3D,
0xFF, 0x3F, 0x3E, 0xFE, 0xFA, 0x3A, 0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38,
0x28, 0xE8, 0xE9, 0x29, 0xEB, 0x2B, 0x2A, 0xEA, 0xEE, 0x2E, 0x2F, 0xEF,
0x2D, 0xED, 0xEC, 0x2C, 0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26,
0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0, 0xA0, 0x60, 0x61, 0xA1,
0x63, 0xA3, 0xA2, 0x62, 0x66, 0xA6, 0xA7, 0x67, 0xA5, 0x65, 0x64, 0xA4,
0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F, 0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB,
0x69, 0xA9, 0xA8, 0x68, 0x78, 0xB8, 0xB9, 0x79, 0xBB, 0x7B, 0x7A, 0xBA,
0xBE, 0x7E, 0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C, 0xB4, 0x74, 0x75, 0xB5,
0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71, 0x70, 0xB0,
0x50, 0x90, 0x91, 0x51, 0x93, 0x53, 0x52, 0x92, 0x96, 0x56, 0x57, 0x97,
0x55, 0x95, 0x94, 0x54, 0x9C, 0x5C, 0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E,
0x5A, 0x9A, 0x9B, 0x5B, 0x99, 0x59, 0x58, 0x98, 0x88, 0x48, 0x49, 0x89,
0x4B, 0x8B, 0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C,
0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42, 0x43, 0x83,
0x41, 0x81, 0x80, 0x40
};//================================
WORD CRC16(BYTE* pchMsg, WORD wDataLen)
{
BYTE chCRCHi = 0xFF; // 高CRC字节初始化
BYTE chCRCLo = 0xFF; // 低CRC字节初始化
WORD wIndex; // CRC循环中的索引 while (wDataLen--)
{
// 计算CRC
wIndex = chCRCLo ^ *pchMsg++ ;
chCRCLo = chCRCHi ^ chCRCHTalbe[wIndex];
chCRCHi = chCRCLTalbe[wIndex] ;
} return ((chCRCHi << 8) | chCRCLo) ;
}
//================================
void __fastcall TForm1::Button1Click(TObject *Sender)
{
AnsiString str;
char test[5] = {0x2b,00,01,00,0x0a};
str.sprintf("%4x\n",CRC16(test,5));
ShowMessage(str);
}
procedure TForm1.Button3Click(Sender: TObject);
var
str: String;
Ret: Word;
mybyte:pchar;
begin
HexToBin(pChar(Edit5.Text),@mybyte,Length(Edit2.Text));
Ret := mjComCRC11(pbyte(mybyte),sizeof(mybyte));
GetMem(mybyte,sizeof(Ret) * 2);
BinToHex(PChar(@Ret),PChar(mybyte),sizeof(ret));
ShowMessage(mybyte);
end; 请高再帮我看看...谢谢...
str,Str1: String;
Ret: Word;
mybyte:pchar;
i: Integer;
begin
Str1 := Edit2.Text; //假定你用Edit2输入
SetLength(Str,Length(Str1));
i := HexToBin(PChar(str1),PChar(Str),Length(Str1));
SetLength(Str,i);
Ret := mjComCRC(pbyte(Str),i);
GetMem(mybyte,sizeof(Ret) * 2);
BinToHex(PChar(@Ret),PChar(mybyte),sizeof(ret));
ShowMessage(mybyte);
end;
里面的mjcomcrc 是什么冬冬 运行会报错啊
var
str,Str1: String;
Ret: Word;
mybyte:string;
i: Integer;
begin
Str1 := Edit2.Text; //假定你用Edit2输入
SetLength(Str,Length(Str1));
i := HexToBin(PChar(str1),PChar(Str),Length(Str1));
SetLength(Str,i);
Ret := mjComCRC(pbyte(Str),i);
SetLength(mybyte,sizeof(Ret) * 2);
BinToHex(PChar(@Ret),PChar(mybyte),sizeof(ret));
ShowMessage(mybyte);
end;这样才对吧!!!故意留BUG难人的吧!嘎嘎