Sleep in QtScript

mcosta

Hi all,

I'm developing a Scriptable Application and all works how I need.
Now I'd like to create a script that executes some steps, waits for a fixed amount of time (sleep like) and continues execution.

I don't know ECMA Script so well but I don't found a "sleep" function; at the moment the solution I tought is to implement a Q_INVOKABLE method in C++ object who performs sleep and call it from script.

Any suggestion?

Thanks in advance

andre

Yeah: don't. Just don't sleep. It is a bad idea. Really.

mcosta

Thanks for the answer,

Probably I didn't provide enough info.
My purpose is to create a software that enable user to write custom procedure (a test tool).

I'd like to provide user functionality like loop(), and sleep()/wait().
I thinking to use ECMAScript for that.

How do you propose to achieve this?

Thanks

andre

What is the purpose of introducing such a wait? What do you want the host application to do in the mean time? In what thread is the script running?

mcosta

Ok,
I provide more details.

I'm developing a message based test tool (a tool that sends a receives data from System to test);
I developed a backend that reads data structures from XML and perform validation of received data.

I'd like to create a script engine that allows user to write our test procedure;

one example could be

Send MessageA;
Receive MessageB with fieldA=X, fieldB=Y, .....

Anoter example could be

Send MessageA
Wait 5 seconds
Send MessageB
Receive MessageC

Is this feasible with QtScript?
This is why I thought to sleep() function

Thanks in advance

andre

You're not answering the question. What is the rest of your code supposed to do in the mean time?

mcosta

HI,

I'm thinking to launch script evaluation in separate thread

andre

Really? So... how do you give access to your applications objects then?

The only thing I can come up with for a sleep function usuable from scripts but not completely blocking your application, is to create and expose a C++ method like this:
@
void sleep(uint milliseconds) {
QEventLoop loop;
QTimer timer;
timer.setTimeout(milliseconds);
connect(&timer, SIGNAL(timeout()), &loop, SLOT(quit()));
timer.start();
loop.exec();
}
@

mcosta

Ok,

at the moment it's only an idea. I think I need to develop something in order to try the right way to do this.
When I have something working I post new questions.

Thanks a lot for suggestions

Max

Flinco

I am returning to this old topic because I have a similar need.
I use the Qt Installer Framework to install my Qt application written in C++.
I should point out that with the Qt Installer Framework, you can create two types of installers: “online”, which downloads what it needs to install from a remote repository, and “offline”, which contains everything it needs.
Offline installers have one drawback: they do not allow you to “update” from an older version to a newer one. As a result, if the software is already installed, you have to uninstall the previous version before installing a new one.
At the moment, I cannot create an “online” installer (which would solve the problem), so I have come up with a workaround for the “offline” installer which, thanks to a Qt script, silently uninstalls the old version.

Now, I need to insert a few seconds of “sleep” into the Qt script to give the uninstaller, which runs in the background, time to do its job. This is because users (including myself) are often a little too quick to move forward with the installation process and are told that “the destination folder is already in use” even though, when they try again a moment later, it is free and available for installation.