How to convert std::vector<uint8_t> to QByteArray?

Question

I am trying to create QByteArray from std::vector.. I tried;

std::vector<uint8_t> buf;
QByteArray img = new QByteArray(reinterpret_cast<const char>(buf), buf.size());

However it gives error;

error: invalid cast from type 'std::vector<unsigned char, std::allocator<unsigned char> >' to type 'const char'

Solution

You need to cast buf.data() instead of buf:

QByteArray* img = new QByteArray(reinterpret_cast<const char*>(buf.data()), buf.size());

Comments

[johimi]

Note .data() is only available in C++11 and later. If your compiler doesn't support this, use &buf[0].

[goGud]

when I use buf.data() it says error: cast from 'unsigned char*' to 'const char' loses precision

[goGud]

ohh.. my mistake, I didnt use char pointer.. thank you very much

[akira hinoshiro]

I personally do avoid new and delete wherever I can. You can do on modern compilers like this: [auto img = QByteArray(reinterpret_cast<const char*>(buf.data()), buf.size());]