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Sourcecode: qt4-x11 version File versions

src.corelib.tools.qbytearray.cpp

//! [0]
        QByteArray ba("Hello");
//! [0]


//! [1]
        QByteArray ba;
        ba.resize(5);
        ba[0] = 0x3c;
        ba[1] = 0xb8;
        ba[2] = 0x64;
        ba[3] = 0x18;
        ba[4] = 0xca;
//! [1]


//! [2]
        for (int i = 0; i < ba.size(); ++i) {
            if (ba.at(i) >= 'a' && ba.at(i) <= 'f')
                cout << "Found character in range [a-f]" << endl;
        }
//! [2]


//! [3]
        QByteArray x("and");
        x.prepend("rock ");         // x == "rock and"
        x.append(" roll");          // x == "rock and roll"
        x.replace(5, 3, "&");       // x == "rock & roll"
//! [3]


//! [4]
        QByteArray ba("We must be <b>bold</b>, very <b>bold</b>");
        int j = 0;
        while ((j = ba.indexOf("<b>", j)) != -1) {
            cout << "Found <b> tag at index position " << j << endl;
            ++j;
        }
//! [4]


//! [5]
        QByteArray().isNull();          // returns true
        QByteArray().isEmpty();         // returns true

        QByteArray("").isNull();        // returns false
        QByteArray("").isEmpty();       // returns true

        QByteArray("abc").isNull();     // returns false
        QByteArray("abc").isEmpty();    // returns false
//! [5]


//! [6]
        QByteArray ba("Hello");
        int n = ba.size();          // n == 5
        ba.data()[0];               // returns 'H'
        ba.data()[4];               // returns 'o'
        ba.data()[5];               // returns '\0'
//! [6]


//! [7]
        QByteArray().isEmpty();         // returns true
        QByteArray("").isEmpty();       // returns true
        QByteArray("abc").isEmpty();    // returns false
//! [7]


//! [8]
        QByteArray ba("Hello world");
        char *data = ba.data();
        while (*data) {
            cout << "[" << *data << "]" << endl;
            ++data;
        }
//! [8]


//! [9]
        QByteArray ba;
        for (int i = 0; i < 10; ++i)
            ba[i] = 'A' + i;
        // ba == "ABCDEFGHIJ"
//! [9]


//! [10]
        QByteArray ba("Stockholm");
        ba.truncate(5);             // ba == "Stock"
//! [10]


//! [11]
        QByteArray ba("STARTTLS\r\n");
        ba.chop(2);                 // ba == "STARTTLS"
//! [11]


//! [12]
        QByteArray x("free");
        QByteArray y("dom");
        x += y;
        // x == "freedom"
//! [12]


//! [13]
        QByteArray().isNull();          // returns true
        QByteArray("").isNull();        // returns false
        QByteArray("abc").isNull();     // returns false
//! [13]


//! [14]
        QByteArray ba("Istambul");
        ba.fill('o');
        // ba == "oooooooo"

        ba.fill('X', 2);
        // ba == "XX"
//! [14]


//! [15]
        QByteArray x("ship");
        QByteArray y("air");
        x.prepend(y);
        // x == "airship"
//! [15]


//! [16]
        QByteArray x("free");
        QByteArray y("dom");
        x.append(y);
        // x == "freedom"
//! [16]


//! [17]
        QByteArray ba("Meal");
        ba.insert(1, QByteArray("ontr"));
        // ba == "Montreal"
//! [17]


//! [18]
        QByteArray ba("Montreal");
        ba.remove(1, 4);
        // ba == "Meal"
//! [18]


//! [19]
        QByteArray x("Say yes!");
        QByteArray y("no");
        x.replace(4, 3, y);
        // x == "Say no!"
//! [19]


//! [20]
        QByteArray ba("colour behaviour flavour neighbour");
        ba.replace(QByteArray("ou"), QByteArray("o"));
        // ba == "color behavior flavor neighbor"
//! [20]


//! [21]
        QByteArray x("sticky question");
        QByteArray y("sti");
        x.indexOf(y);               // returns 0
        x.indexOf(y, 1);            // returns 10
        x.indexOf(y, 10);           // returns 10
        x.indexOf(y, 11);           // returns -1
//! [21]


//! [22]
        QByteArray ba("ABCBA");
        ba.indexOf("B");            // returns 1
        ba.indexOf("B", 1);         // returns 1
        ba.indexOf("B", 2);         // returns 3
        ba.indexOf("X");            // returns -1
//! [22]


//! [23]
        QByteArray x("crazy azimuths");
        QByteArray y("azy");
        x.lastIndexOf(y);           // returns 6
        x.lastIndexOf(y, 6);        // returns 6
        x.lastIndexOf(y, 5);        // returns 2
        x.lastIndexOf(y, 1);        // returns -1
//! [23]


//! [24]
        QByteArray ba("ABCBA");
        ba.lastIndexOf("B");        // returns 3
        ba.lastIndexOf("B", 3);     // returns 3
        ba.lastIndexOf("B", 2);     // returns 1
        ba.lastIndexOf("X");        // returns -1
//! [24]


//! [25]
        QByteArray url("ftp://ftp.trolltech.com/");
        if (url.startsWith("ftp:"))
            ...
//! [25]


//! [26]
        QByteArray url("http://www.trolltech.com/index.html");
        if (url.endsWith(".html"))
            ...
//! [26]


//! [27]
        QByteArray x("Pineapple");
        QByteArray y = x.left(4);
        // y == "Pine"
//! [27]


//! [28]
        QByteArray x("Pineapple");
        QByteArray y = x.right(5);
        // y == "apple"
//! [28]


//! [29]
        QByteArray x("Five pineapples");
        QByteArray y = x.mid(5, 4);     // y == "pine"
        QByteArray z = x.mid(5);        // z == "pineapples"
//! [29]


//! [30]
        QByteArray x("TROlltECH");
        QByteArray y = x.toLower();
        // y == "trolltech"
//! [30]


//! [31]
        QByteArray x("TROlltECH");
        QByteArray y = x.toUpper();
        // y == "TROLLTECH"
//! [31]


//! [32]
        QByteArray ba("  lots\t of\nwhitespace\r\n ");
        ba = ba.simplified();
        // ba == "lots of whitespace";
//! [32]


//! [33]
        QByteArray ba("  lots\t of\nwhitespace\r\n ");
        ba = ba.trimmed();
        // ba == "lots\t of\nwhitespace";
//! [33]


//! [34]
        QByteArray x("apple");
        QByteArray y = x.leftJustified(8, '.');   // y == "apple..."
//! [34]


//! [35]
        QByteArray x("apple");
        QByteArray y = x.rightJustified(8, '.');    // y == "...apple"
//! [35]


//! [36]
        QByteArray str("FF");
        bool ok;
        int hex = str.toInt(&ok, 16);     // hex == 255, ok == true
        int dec = str.toInt(&ok, 10);     // dec == 0, ok == false
//! [36]


//! [37]
        QByteArray str("FF");
        bool ok;
        long hex = str.toLong(&ok, 16);   // hex == 255, ok == true
        long dec = str.toLong(&ok, 10);   // dec == 0, ok == false
//! [37]


//! [38]
        QByteArray string("1234.56");
        double a = string.toDouble();   // a == 1234.56
//! [38]


//! [39]
        QByteArray text("Qt is great!");
        text.toBase64();        // returns "UXQgaXMgZ3JlYXQh"
//! [39]


//! [40]
        QByteArray ba;
        int n = 63;
        ba.setNum(n);           // ba == "63"
        ba.setNum(n, 16);       // ba == "3f"
//! [40]


//! [41]
        int n = 63;
        QByteArray::number(n);              // returns "63"
        QByteArray::number(n, 16);          // returns "3f"
        QByteArray::number(n, 16).toUpper();  // returns "3F"
//! [41]


//! [42]
        QByteArray ba = QByteArray::number(12.3456, 'E', 3);
        // ba == 1.235E+01
//! [42]


//! [43]
         static const char mydata[] = {
            0x00, 0x00, 0x03, 0x84, 0x78, 0x9c, 0x3b, 0x76,
            0xec, 0x18, 0xc3, 0x31, 0x0a, 0xf1, 0xcc, 0x99,
            ...
            0x6d, 0x5b
        };

        QByteArray data = QByteArray::fromRawData(mydata, sizeof(mydata));
        QDataStream in(&data, QIODevice::ReadOnly);
        ...
//! [43]


//! [44]
        QByteArray text = QByteArray::fromBase64("UXQgaXMgZ3JlYXQh");
        text.data();            // returns "Qt is great!"
//! [44]


//! [45]
        QByteArray text = QByteArray::fromHex("517420697320677265617421");
        text.data();            // returns "Qt is great!"
//! [45]



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