save variable size hex string into uchar array

[amika]

Suppose that I have a number in hexadecimal notation
with size 2n, like "aa00F234AA". I want to write it in
an unsigned char array of size n ("aa" in the first
byte, "00" in the second byte, etc) . In fact I want a
function like this

void f(unsigned char* dest, QString str);

void f(unsigned char* dest, QString str);

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How can I do this?
Can I use QByteArray::fromHex()
Thanks in advance.

[ChrisW67]

Yes, use QByteArray::fromHex() and then copy QByteArray::size() bytes out of the QByteArray::constData() buffer into your (preallocated) dest buffer using memcpy() or whatever.

The question remains; do you really want to mix managed memory with the unmanaged C-style malloced blocks and pointers?