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A slider is used in exactly the same way as a spin box: to enable the user to pick a value within a given range. The QSlider class also uses the minimum and maximum properties to control the range of the control, as well as the setRange method to change both properties at once. When it comes to the size of each change, the slider is different. The user can make either big changes or small changes; they are controlled by the singleStep and pageStep properties. When the user clicks on either side of the slider position indicator, a page step is made. To take

For example, here are two ways that you might try binding to localhost: >>> getaddrinfo('127001', 'smtp', 0, socketSOCK_STREAM, 0) [(2, 1, 6, '', ('127001', 25))] >>> getaddrinfo('localhost', 'smtp', 0, socketSOCK_STREAM, 0) [(10, 1, 6, '', ('::1', 25, 0, 0)), (2, 1, 6, '', ('127001', 25))] You can see that supplying the IPv4 address for the localhost locks you down to receiving connections only over IPv4, while using the symbolic name localhost (at least on my Linux laptop, with a well-configured /etc/hosts file) makes available both the IPv4 and IPv6 local names for the machine.

a single step, the user must click the slider to give it focus and then use the arrow keys of the keyboard. Just as with the step size of the spin box, the user can still reach values between the single steps by dragging the position indication into place. To detect value changes, connect to the valueChanged(int) signal.

Summary

Note Use valueChanged to avoid missing changes by keyboard, dragging, or clicking. The valueChanged

One question that you might already be asking at this point, by the way, is what on earth you are supposed to do when you assert that you want to supply a basic service and getaddrinfo() goes and gives you several addresses to use you certainly cannot create a single socket and bind() it to more than one address! In 7, we will tackle the techniques that you can use if you are writing server code and want to have several sockets going at once..

In Designer, the slider widget shows up as two widgets: horizontal slider and vertical slider. You can control the orientation of the widget between Horizontal and Vertical by using the orientation property. A very similar widget is the QScrollBar, which tells the user that the widget not only picks a value but also picks a range of values indicated by the size of the slider. The pageStep property indicates how large the slider is and tells the user how much of the range is selected.

Except for the use shown in the previous section, all other uses of getaddrinfo() are outward-looking, and generate information suitable for connecting you to other applications. In all such cases, you can either use an empty string to indicate that you want to connect back to the localhost using the loopback interface, or provide a string giving an IPv4 address, IPv6 address, or hostname to name your destination. The usual use of getaddrinfo() in all other cases which, basically, is when you are preparing to connect() or sendto() is to specify the AI_ADDRCONFIG flag, which filters out any addresses that are

Sliders, scroll bars, and spin boxes are all useful for letting the user pick a value, but the progress bar can be used to show a value in a read-only form You can customize the range of a progress bar using the minimum and maximum properties (yes, there is a setRange(int, int) method as well) If you set both minimum and maximum to zero, you get an activity bar going around and around without a defined end, which is great for showing that you are doing something when performing long tasks that you cannot judge the length of in advance The actual progress is set using the setValue(int) method, and you can return the progress bar to zero using the reset() method.

impossible for your computer to reach For example, an organization might have both an IPv4 and an IPv6 range of IP addresses; but if your particular host supports only IPv4, then you will want the results filtered to include only addresses in that family In case the local machine has only an IPv6 network interface but the service you are connecting to is supporting only IPv4, the AI_V4MAPPED will return you those IPv4 addresses re-encoded as IPv6 addresses that you can actually use So you will usually use getaddrinfo() this way when connecting: >>> getaddrinfo('ftpkernelorg', 'ftp', 0, socketSOCK_STREAM, 0, .. socketAI_ADDRCONFIG | socketAI_V4MAPPED) [(2, 1, 6, '', ('20415219137', 21)), (2, 1, 6, '', ('1492020133', 21))] And we have gotten exactly what we wanted: every way to connect to a host named ftpkernel.

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