On non-const strings, operator() returns a reference To access the character at a particular index position, QString uses 0-based indexes, just likeĬ++ arrays. The character data, use omRawData() instead.)Īnother approach is to set the size of the string using resize() and to initialize the dataĬharacter per character. (If for performance reasons you don't want to take a deep copy of You can also provide string data as an array of QChars: static const QChar data = ĭata, so you can modify it later without experiencing side effects. Parameters, the const char * is interpreted as a classicĬ-style '\0'-terminated string. In all of the QString functions that take const char * By default, fromAscii() treats character above 128Īs Latin-1 characters, but this can be changed by calling tCodecForCStrings(). QString converts the const char * data into Unicodeįunction.
For example, the following codeĬreates a QString of size 5 containing the data "Hello": QString str = "Hello"
One way to initialize a QString is simply to pass a constĬhar * to its constructor. To store raw binary data, and when memory conservation is critical The two main cases where QByteArray is appropriate are when you need It is used throughout the QtĪPI, and the Unicode support ensures that your applications will beĮasy to translate if you want to expand your application's marketĪt some point. Traditional 8-bit '\0'-terminated strings. In addition to QString, Qt also provides the QByteArray class to store raw bytes and ThisĪlso helps reduce the inherent overhead of storing 16-bit Reduce memory usage and to avoid the needless copying of data. Is a superset of US-ASCII (ANSI X3.4-1986) and Latin-1 (ISOĨ859-1), and all the US-ASCII/Latin-1 characters are available atīehind the scenes, QString uses implicit sharing (copy-on-write) to Standard that supports most of the writing systems in use today. (Unicode characters withĬode values above 65535 are stored using surrogate pairs, i.e., two QString stores a string of 16-bit QChars, where each QCharĬorresponds one Unicode 4.0 character. The QString class provides a Unicode character string.
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