Qt5.9 写的一个crc校验例子

界面如下图：

界面很简单 从网上随便找了个crc8  crc16 crc32算法直接加进去了，想实现其他算法的自己添加就可以了

main就不介绍了，界面 一个textEdit  commbox pushbutton lineEdit 就这几个控件

通过信号槽判断选中的算法然后 pushbutton按下去执行对应的算法

代码如下：

crcchecksum.h

#ifndef CRCCHECKSUM_H
#define CRCCHECKSUM_H

#include 
#include 
#include 
#include 
#include 
#include 
#include 

typedef unsigned char u8;
typedef unsigned char byte;
typedef unsigned short u16;
typedef unsigned int u32;

class crcCheckSum
{
public:
    crcCheckSum();
    quint16 crc16ForModbus(const QByteArray &data);

    quint8 Crc8(const QByteArray &data);
    quint16 Crc16(const QByteArray &data);
    u32 Crc32(byte *_pBuff, u16 _size);
};

#endif // CRCCHECKSUM_H

crcchecksum.cpp

#include "crcchecksum.h"

crcCheckSum::crcCheckSum()
{

}

// x16 x15 x2 1
quint16 crcCheckSum::crc16ForModbus(const QByteArray &data)
{
    static const quint16 crc16Table[] =
        {
            0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,
            0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,
            0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,
            0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841,
            0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40,
            0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41,
            0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641,
            0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040,
            0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240,
            0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441,
            0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41,
            0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840,
            0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41,
            0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40,
            0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640,
            0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041,
            0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240,
            0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441,
            0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41,
            0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840,
            0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41,
            0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40,
            0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640,
            0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041,
            0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241,
            0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440,
            0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40,
            0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841,
            0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40,
            0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41,
            0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641,
            0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040
        };
    quint8 buf;
    quint16 crc16 = 0xFFFF;

    for ( auto i = 0; i < data.size(); ++i )
    {
        buf = data.at( i ) ^ crc16;
        crc16 >>= 8;
        crc16 ^= crc16Table[ buf ];
    }

    return crc16;
}


static const u8 caCrc8Data[256] = {
    0x00, 0x5e, 0xbc, 0xe2, 0x61, 0x3f, 0xdd, 0x83,
    0xc2, 0x9c, 0x7e, 0x20, 0xa3, 0xfd, 0x1f, 0x41,
    0x9d, 0xc3, 0x21, 0x7f, 0xfc, 0xa2, 0x40, 0x1e,
    0x5f, 0x01, 0xe3, 0xbd, 0x3e, 0x60, 0x82, 0xdc,
    0x23, 0x7d, 0x9f, 0xc1, 0x42, 0x1c, 0xfe, 0xa0,
    0xe1, 0xbf, 0x5d, 0x03, 0x80, 0xde, 0x3c, 0x62,
    0xbe, 0xe0, 0x02, 0x5c, 0xdf, 0x81, 0x63, 0x3d,
    0x7c, 0x22, 0xc0, 0x9e, 0x1d, 0x43, 0xa1, 0xff,
    0x46, 0x18, 0xfa, 0xa4, 0x27, 0x79, 0x9b, 0xc5,
    0x84, 0xda, 0x38, 0x66, 0xe5, 0xbb, 0x59, 0x07,
    0xdb, 0x85, 0x67, 0x39, 0xba, 0xe4, 0x06, 0x58,
    0x19, 0x47, 0xa5, 0xfb, 0x78, 0x26, 0xc4, 0x9a,
    0x65, 0x3b, 0xd9, 0x87, 0x04, 0x5a, 0xb8, 0xe6,
    0xa7, 0xf9, 0x1b, 0x45, 0xc6, 0x98, 0x7a, 0x24,
    0xf8, 0xa6, 0x44, 0x1a, 0x99, 0xc7, 0x25, 0x7b,
    0x3a, 0x64, 0x86, 0xd8, 0x5b, 0x05, 0xe7, 0xb9,
    0x8c, 0xd2, 0x30, 0x6e, 0xed, 0xb3, 0x51, 0x0f,
    0x4e, 0x10, 0xf2, 0xac, 0x2f, 0x71, 0x93, 0xcd,
    0x11, 0x4f, 0xad, 0xf3, 0x70, 0x2e, 0xcc, 0x92,
    0xd3, 0x8d, 0x6f, 0x31, 0xb2, 0xec, 0x0e, 0x50,
    0xaf, 0xf1, 0x13, 0x4d, 0xce, 0x90, 0x72, 0x2c,
    0x6d, 0x33, 0xd1, 0x8f, 0x0c, 0x52, 0xb0, 0xee,
    0x32, 0x6c, 0x8e, 0xd0, 0x53, 0x0d, 0xef, 0xb1,
    0xf0, 0xae, 0x4c, 0x12, 0x91, 0xcf, 0x2d, 0x73,
    0xca, 0x94, 0x76, 0x28, 0xab, 0xf5, 0x17, 0x49,
    0x08, 0x56, 0xb4, 0xea, 0x69, 0x37, 0xd5, 0x8b,
    0x57, 0x09, 0xeb, 0xb5, 0x36, 0x68, 0x8a, 0xd4,
    0x95, 0xcb, 0x29, 0x77, 0xf4, 0xaa, 0x48, 0x16,
    0xe9, 0xb7, 0x55, 0x0b, 0x88, 0xd6, 0x34, 0x6a,
    0x2b, 0x75, 0x97, 0xc9, 0x4a, 0x14, 0xf6, 0xa8,
    0x74, 0x2a, 0xc8, 0x96, 0x15, 0x4b, 0xa9, 0xf7,
    0xb6, 0xe8, 0x0a, 0x54, 0xd7, 0x89, 0x6b, 0x35
};

quint8 crcCheckSum::Crc8(const QByteArray &data) {
//    int i;
//    u8 temp, CRC8;
//    CRC8 = 0xff;
//    for (i = 0; i < _size; i++) {
//        temp = *(_pBuff + i) ^ CRC8;
//        CRC8 = caCrc8Data[temp];
//    }
//    return (CRC8);

    quint8 buf;
    quint8 crc8 = 0xff;

    for(auto i = 0;i>= 1;
//                CRC16 ^= 0xA001;
//            } else {
//                CRC16 >>= 1;
//            }
//        }
//    }
//    CRC16 = (CRC16 >> 8) + (CRC16 << 8);
//    return (CRC16);

    quint16 c,crc16;

    crc16 = 0xFFFF;

    for(int i=0; i< data.size();i++){
        c = data.at(i) &0x00FF;
        crc16 ^= c;
        for(int j = 0; j<8; j++){
            if(crc16 & 0x0001){
                crc16 >>=1;
                crc16 ^= 0xA001;
            }else{
                crc16 >>= 1;
            }
        }
    }
    crc16 = (crc16 >>8 ) + (crc16<<8);
    return (crc16);
}

u32 crcCheckSum::Crc32(byte *_pBuff, u16 _size) {
    int i, j;
    u32 CRC32;

    CRC32 = 0xFFFFFFFF;
    for (i = 0; i < _size; i++) {
        for (j = 0; j < 8; j++) {
            if (CRC32 & 1) {
                CRC32 = (CRC32 >> 1) ^ 0xEDB88320;
            } else {
                CRC32 = (CRC32 >> 1);
            }
            if (_pBuff[i] & (1 << j)) {
                CRC32 ^= 0xEDB88320;
            }
        }
    }
    CRC32 = ~CRC32;
    return (CRC32);
}

widget.h

#ifndef WIDGET_H

#define WIDGET_H

#include 

#include 

#include 

#include "crcchecksum.h"

#include 

namespace Ui {

class Widget;

}

class Widget : public QWidget

{

    Q_OBJECT

public:

    explicit Widget(QWidget *parent = 0);

    ~Widget();

private slots:

    void on_pushButton_clicked();

    void currentIndexChanged(int);

private:

    Ui::Widget *ui;

    int comBoxIndex;

    crcCheckSum crcCheck;

};

#endif // WIDGET_H

widget.cpp

#include "widget.h"
#include "ui_widget.h"
#include "crcchecksum.h"

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    comBoxIndex = 0;
    connect(ui->comboBox, SIGNAL(currentIndexChanged(int)),this,SLOT(currentIndexChanged(int)));
}

Widget::~Widget()
{
    delete ui;
}

/*
    static u8 crc8SumTable(u8 *p, int len);
    u8 Crc8Sum(u8 *buf, int len);
    void coverHex(u8 *des,u8 *source, int len);
*/
void Widget::on_pushButton_clicked()
{
    //清除空格
    QString inputData = ui->textEdit->toPlainText();
    if(inputData.isEmpty()) return;
    auto data = QByteArray::fromHex(inputData.toLocal8Bit());
    QString str;
    quint8 crc8;
    quint16 crc16;
    quint16 crc162;
    switch(comBoxIndex){
    case 0: //crc8
    {
        crc8 = crcCheck.Crc8(data);
        str  = QString::number(crc8,16).toUpper();
        break;
    }
    case 1://crc16
    {
        crc16 = crcCheck.crc16ForModbus(data);
        str  = QString::number(crc16,16).toUpper();
        break;
    }
    case 2://crc32
    {
        crc162 = crcCheck.Crc16(data);
        str  = QString::number(crc162,16).toUpper();
        break;
    }
    case 3:
        break;
    default:
        break;
    }

    ui->lineEdit->setText(str);
}

void Widget::currentIndexChanged(int currentIndex)
{
    comBoxIndex = currentIndex;
}

main 和pro就默认的没修改。东西很简单，不懂了欢迎留言。

源码：点我下载