Is there a quick way to convert a float value to a byte wise (hex) representation in a QByteArray?

Have done similar with memcpy() before using arrays, but this doesn't seem to work too well with QByteArray.

For example:

memcpy(&byteArrayData,&floatData,sizeof(float));

Can go the other way just fine using:

float *value= (float *)byteArrayData.data();

Am I just implementing this wrong or is there a better way to do it using Qt?

Thanks