QByteArray is a class in the Qt library which is used to manipulate byte arrays. It provides various functions for reading and writing data to and from byte arrays. One of the functions provided by QByteArray is isNull().
The isNull() function returns true if the byte array is null, i.e. if it contains no data. Otherwise, it returns false.
Here are some code examples:
Example 1: Using isNull() to check if a QByteArray object is empty.
QByteArray byteArray;
if (byteArray.isNull()) {
qDebug() << "The byte array is empty";
}
Output: The byte array is empty
Example 2: Using isNull() to check if a QByteArray object contains data.
QByteArray byteArray("Hello");
if (!byteArray.isNull()) {
qDebug() << byteArray;
}
Output: Hello
In order to use QByteArray in your C++ code, you must include the Qt core library:
#include
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