QT对QBytearray的data()指针进行结构体转换时会自动字节对齐填充

1、测试代码

#include <QCoreApplication>#pragma pack(push, 1)
typedef struct
{int a;float b;char c;int *d;
}testStruct;
#pragma pack(pop)#include <QByteArray>
#include <QDebug>int main()
{testStruct structA;structA.a = 1;structA.b = 2;structA.c = 'a';structA.d = new int[10];for (int i = 0; i < 10; ++i) {structA.d[i] = i;}QByteArray arr;arr.resize(49);memcpy(arr.data(), &structA, 9);memcpy(arr.data() + 9, structA.d, 40);// testStruct *sb = reinterpret_cast<testStruct *>(arr.data());testStruct *sb = (testStruct*)arr.data();sb->d = reinterpret_cast<int *>(arr.data() + 9);;for (int i = 0; i < 10; ++i) {qDebug() << sb->d[i];}return 0;
}

2、输出结果

40642209
0
2
3
4
5
6
7
8
9

3、发现

经过调试指针转换后，发现本来设置的1字节对其变成了4字节对齐
QBytearray的data()指针被转换后会按照4字节自动对齐填充，不知为何会这样
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