Question

我为这个问题道歉（全新手），USPS网站提供以下功能来生成条形码。文档显示： USPS_MSB_Math_CRC11GenerateFrameCheckSequence（016907B2A24ABC16A2E5C004B1（HEX））= 751（HEX）

我已经尝试了很多东西（传递十六进制，将0x放在前面，传递二进制）但我可以得到正确的结果，我如何将十六进制值传递给函数？任何想法/建议/更正请...非常感谢你！

/*Inputs: ByteArrayPtr is the address of a 13 byte array holding 102 bits which
 are right justified - ie: the leftmost 2 bits of the first byte do not
 hold data and must be set to zero.

 Outputs: Outputs:return unsigned short - 11 bit Frame Check Sequence (right justified)
*/

extern unsigned short
USPS_MSB_Math_CRC11GenerateFrameCheckSequence( unsigned char *ByteArrayPtr )
{
unsigned short  GeneratorPolynomial = 0x0F35;
unsigned short  FrameCheckSequence  = 0x07FF;
unsigned short  Data;
int             ByteIndex,Bit;

/* Do most significant byte skipping the 2 most significant bits */
Data = *ByteArrayPtr << 5;
ByteArrayPtr++;

for ( Bit = 2; Bit < 8; Bit++ ) {
    if ( (FrameCheckSequence ^ Data) & 0x400 )
        FrameCheckSequence = (FrameCheckSequence << 1) ^ GeneratorPolynomial;
    else
        FrameCheckSequence = (FrameCheckSequence << 1);
    FrameCheckSequence &= 0x7FF;
    Data <<= 1;
}

/* Do rest of the bytes */
for ( ByteIndex = 1; ByteIndex < 13; ByteIndex++ ) {
    Data = *ByteArrayPtr << 3;
    ByteArrayPtr++;
    for ( Bit = 0; Bit < 8; Bit++ ) {
        if ( (FrameCheckSequence ^ Data) & 0x0400 )
            FrameCheckSequence = (FrameCheckSequence << 1) ^ GeneratorPolynomial;
        else
            FrameCheckSequence = (FrameCheckSequence << 1);

        FrameCheckSequence &= 0x7FF;
        Data <<= 1;
    }
}

return FrameCheckSequence;
}

Answer 1

你应该制作一个数组，然后传入它 - 就像那里的评论一样。

对于你的例子：

unsigned char array[] = { 0x01, 0x69, 0x07, 0xB2, 0xA2, 0x4A, 0xBC, 
                          0x16, 0xA2, 0xE5, 0xC0, 0x04, 0xB1 
                        };
unsigned short myCRC = USPS_MSB_Math_CRC11GenerateFrameCheckSequence(array);

将字节数组传递给函数

1 个答案: