Obsolete Members for QByteArray
The following members of class QByteArray are deprecated. They are provided to keep old source code working. We strongly advise against using them in new code.
Public Functions
(deprecated in 6.4) qsizetype | count() const |
Related Non-Members
(deprecated in 6.9) int | qsnprintf(char *str, size_t n, const char *fmt, ...) |
(deprecated in 6.9) int | qvsnprintf(char *str, size_t n, const char *fmt, va_list ap) |
(since 6.2, deprecated in 6.8) QByteArray | operator""_qba(const char *str, size_t size) |
Member Function Documentation
[noexcept, deprecated in 6.4] qsizetype QByteArray::count() const
This function is deprecated since 6.4. We strongly advise against using it in new code.
Use size() or length() instead.
This is an overloaded function.
Same as size().
Related Non-Members
[deprecated in 6.9] int qsnprintf(char *str, size_t n, const char *fmt, ...)
This function is deprecated since 6.9. We strongly advise against using it in new code.
Use C++11's std::snprintf() from <cstdio> instead.
A portable snprintf() function, calls qvsnprintf.
fmt is the printf() format string. The result is put into str, which is a buffer of at least n bytes.
Warning: Call this function only when you know what you are doing since it shows different behavior on certain platforms. Use QString::asprintf() to format a string instead.
See also qvsnprintf() and QString::asprintf().
[deprecated in 6.9] int qvsnprintf(char *str, size_t n, const char *fmt, va_list ap)
This function is deprecated since 6.9. We strongly advise against using it in new code.
Use C++11's std::vsnprintf() from <cstdio> instead.
A portable vsnprintf() function. Will call ::vsnprintf(), ::_vsnprintf(), or ::vsnprintf_s depending on the system, or fall back to an internal version.
fmt is the printf() format string. The result is put into str, which is a buffer of at least n bytes.
The caller is responsible to call va_end() on ap.
Warning: Since vsnprintf() shows different behavior on certain platforms, you should not rely on the return value or on the fact that you will always get a 0 terminated string back. There are also differences in how %a (hex floats) and %ls (wide strings) are handled on WebAssembly and Android.
Ideally, you should never call this function but use QString::asprintf() instead.
See also qsnprintf() and QString::asprintf().
[noexcept, since 6.2, deprecated in 6.8] QByteArray operator""_qba(const char *str, size_t size)
This function is deprecated since 6.8. We strongly advise against using it in new code.
Use _ba from Qt::StringLiterals namespace instead.
Literal operator that creates a QByteArray out of the first size characters in the char string literal str.
The QByteArray is created at compile time, and the generated string data is stored in the read-only segment of the compiled object file. Duplicate literals may share the same read-only memory. This functionality is interchangeable with QByteArrayLiteral, but saves typing when many string literals are present in the code.
The following code creates a QByteArray:
auto str = "hello"_qba;
This function was introduced in Qt 6.2.
See also QByteArrayLiteral and QtLiterals::operator""_qs(const char16_t *str, size_t size).
© 2024 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.
