QBuffer在QByteArray的开头而不是结尾处写入字节

Question

I have the following code:

QByteArray ba; // Declare Byte array
ba.clear();    // Clear it
ba.append(80, 0x00); // Append 80 bytes of 0x00
quint32 Count = 2;   // The number we want to append to the byte array
QBuffer tempBuffer(&ba); // We use temporary buffer to conveniently put integers and floats into byte-array
tempBuffer.open(QIODevice::WriteOnly);
Count = qToLittleEndian(Count); // Make sure our number is little Endian
tempBuffer.write((char*)&Count, sizeof(quint32)); // Write the number to byte array

When I print to console the content of my byte array:

qDebug() << "ba: " << ba.toHex();

The console prints:

ba:  "0200000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"

As can be seen above, the 2 which is of type quint32 , is correctly represented by the little Endian hex value of 0x02000000 , however, it is added at the start of the byte array rather than the end. How can I append my value to the end of the byte array?

Answer 1

在追加模式而不是writeonly中打开缓冲区：

tempBuffer.open(QIODevice::Append);