本文整理汇总了C++中QBuffer::ungetChar方法的典型用法代码示例。如果您正苦于以下问题：C++ QBuffer::ungetChar方法的具体用法？C++ QBuffer::ungetChar怎么用？C++ QBuffer::ungetChar使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类QBuffer的用法示例。
在下文中一共展示了QBuffer::ungetChar方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: unget
//--------------------------------------------------------------------
void tst_QIODevice::unget()
{
#if defined(Q_OS_WINCE) && defined(WINCE_EMULATOR_TEST)
QSKIP("Networking tests in a WinCE emulator are unstable", SkipAll);
#endif
QBuffer buffer;
buffer.open(QBuffer::ReadWrite);
buffer.write("ZXCV");
buffer.seek(0);
QCOMPARE(buffer.read(4), QByteArray("ZXCV"));
QCOMPARE(buffer.pos(), qint64(4));
buffer.ungetChar('a');
buffer.ungetChar('b');
buffer.ungetChar('c');
buffer.ungetChar('d');
QCOMPARE(buffer.pos(), qint64(0));
char buf[6];
QCOMPARE(buffer.readLine(buf, 5), qint64(4));
QCOMPARE(buffer.pos(), qint64(4));
QCOMPARE(static_cast<const char*>(buf), "dcba");
buffer.ungetChar('a');
buffer.ungetChar('b');
buffer.ungetChar('c');
buffer.ungetChar('d');
QCOMPARE(buffer.pos(), qint64(0));
for (int i = 0; i < 5; ++i) {
buf[0] = '@';
buf[1] = '@';
QTest::ignoreMessage(QtWarningMsg,
"QIODevice::readLine: Called with maxSize < 2");
QCOMPARE(buffer.readLine(buf, 1), qint64(-1));
QCOMPARE(buffer.readLine(buf, 2), qint64(i < 4 ? 1 : -1));
switch (i) {
case 0:
QCOMPARE(buf[0], 'd');
break;
case 1:
QCOMPARE(buf[0], 'c');
break;
case 2:
QCOMPARE(buf[0], 'b');
break;
case 3:
QCOMPARE(buf[0], 'a');
break;
case 4:
QCOMPARE(buf[0], '\0');
break;
}
QCOMPARE(buf[1], i < 4 ? '\0' : '@');
}
buffer.ungetChar('\n');
QCOMPARE(buffer.readLine(), QByteArray("\n"));
buffer.seek(1);
buffer.readLine(buf, 3);
QCOMPARE(static_cast<const char*>(buf), "XC");
buffer.seek(4);
buffer.ungetChar('Q');
QCOMPARE(buffer.readLine(buf, 3), qint64(1));
for (int i = 0; i < 2; ++i) {
QTcpSocket socket;
QIODevice *dev;
QByteArray result;
const char *lineResult;
if (i == 0) {
dev = &buffer;
result = QByteArray("ZXCV");
lineResult = "ZXCV";
} else {
socket.connectToHost(QtNetworkSettings::serverName(), 80);
socket.write("GET / HTTP/1.0\r\n\r\n");
QVERIFY(socket.waitForReadyRead());
dev = &socket;
result = QByteArray("HTTP");
lineResult = "Date";
}
char ch, ch2;
dev->seek(0);
dev->getChar(&ch);
dev->ungetChar(ch);
QCOMPARE(dev->peek(4), result);
dev->getChar(&ch);
dev->getChar(&ch2);
dev->ungetChar(ch2);
dev->ungetChar(ch);
QCOMPARE(dev->read(1), result.left(1));
QCOMPARE(dev->read(3), result.right(3));
if (i == 0)
//.........这里部分代码省略.........