QByteArray data = "hello world!"; char targetChar = 'l'; int count = data.count(targetChar); // count == 3
QByteArray data = QByteArray::fromHex("48656c6c6f20776f726c6421"); QByteArray targetBytes = QByteArray::fromHex("6c6c"); int count = data.count(targetBytes); // count == 2In this example, we create a QByteArray object from the hexadecimal string "48656c6c6f20776f726c6421", which decodes to the ASCII string "Hello world!". We also create a QByteArray object containing a byte array we want to count, which is the string "ll" encoded as hexadecimal "6c6c". We then call the count() function on the data QByteArray, passing in the targetBytes QByteArray as an argument. The function returns the number of times the sequence "ll" appears in the original data, which is 2. The package library for Qt is usually defined when creating the project through CMake or QMake. The exact library being used must be properly referenced in the code for this function and many others to work correctly.