One letter string into char and then bit-wise comparing
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Hello,
first thanks to the community to have helped me with qtcpserver, qtcpclient and sockets ....
now what i want do:
from the robot i send strings via tcpip to my qt-gui-program, and in some of those strings i have one statusbyte at the end:
qstring statusbyte = line.right(1)in this byte, 6 bits tells me about robots status, so what i want to do after i got this byte, is to check it bitwise with the if-operator, and then i want to make signals to the gui, so the woman (in or company a lot of woman work at the machines... ) can see in gui about robots status.
how do i convert the one sign qstring in a byte and then how do i check its bits in qt-style?
thanks a lot and nice weekend
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Hi. You can send QByteArray insted of QString.
@
QByteArray data = QString("data that you want to transfer").toAscii();
QByteArray statusbyte = line.right(1);
QByteArray pack = data+statusbyte;// and now to convert
QBitArray = pack.right(1);
QString data = pack.left( pack.size()-1 ); // without statusbyte@
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You can use at() or constData() to get array elements from a QString or QByteArray.
e.g.
QByteArray data("test stringX");
char status = data.at(data.length() - 1);
// status == 'X'You can use QFlags or just the C++ integer & operator to test bits in the status byte.
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hi,
thanks for the advices,
now i have one char or qbytearray of dimension 1.how do i check now if bit 3 is 0 or 1?
i would like to get a bool with testflag but it doesnt work fore me yet.
i dont unterstand exactly how to do it with qflags,
can s.o. give me an advice?
Q_DECLARE_OPERATORS_FOR_FLAGS(?)thanks
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Did you actually create a QFlags type with the relevant enum?
Something like:@
enum RobotStatusFlag {
StatusOne = 0x1,
StatusTwo = 0x2,
StatusThree = 0x4,
StatusFoo = 0x8,
StatusBar = 0x10
}
Q_DECLARE_FLAGS(RobotStatusFlag, RobotStatusFlags);Q_DECLARE_OPERTORS_FOR_FLAGS(RobotStatusFlags);
@That would allow you to do something like:
@
RobotStatusFlags status(data.at(data.length() -1);
if (status.testFlag(StatusFoo)) {
// do something foo-like
}
@ -
thanks, that helped a lot!