demo源码：
#include <QApplication>
#include <QDebug>
#include <QByteArray>// 头
typedef struct tagEXT_HEADER
{unsigned short type = 0x5642;
}EXT_HEADER;// 数据包格式
typedef struct tagMsgFormat
{EXT_HEADER header;uint8_t msgId = 0x00;uint8_t msgNum= 0;uint16_t payloadLen = 0;// payload; // 长度不固定
}MsgFormat;int main(int argc, char *argv[])
{// 创建结构体数据EXT_HEADER header;MsgFormat format;format.msgId = 0x20;format.msgNum= 99;format.payloadLen = 16;// 直接导入QByteArray数据QByteArray data = QByteArray::fromStdString("\x01\x02\x03\x04\x05\x06");qDebug()<< "data:" << data.toHex();// 结构体转QByteArray数据QByteArray frame = QByteArray((char *)&header, sizeof(EXT_HEADER));qDebug()<< "frame:" << frame.toHex();// 修改结构体数据，然后转QByteArray数据header.type = 0x3412;QByteArray frame2 = QByteArray((char *)&header, sizeof(EXT_HEADER));qDebug()<< "frame2:" << frame2.toHex();// 嵌套式结构体转QByteArray数据QByteArray frame3 = QByteArray((char *)&format, sizeof(MsgFormat));qDebug()<< "frame3:" << frame3.toHex();// QByteArray数据转嵌套式结构体MsgFormat *cmd = (MsgFormat*)frame3.data();qDebug()<<"";qDebug()<<"frame3转为结构体之后的数据：";qDebug()<< "header:" << cmd->header.type;qDebug()<< "msgId:" << (uint8_t)(cmd->msgId);qDebug()<< "msgNum:" << cmd->msgNum;qDebug()<< "palyloadLen:" << cmd->payloadLen;// QByteArray数据只取帧头EXT_HEADER *cmdHeader = (EXT_HEADER*)frame3.data();qDebug()<< "header:" << cmdHeader->type;return 0;
}
打印结果：
data: "010203040506"
frame: "4256"
frame2: "1234"
frame3: "425620631000"frame3转为结构体之后的数据：
header: 22082
msgId: 32
msgNum: 99
palyloadLen: 16
header: 22082)
