General and Desktop

Of course a QSpinBox widget is a composition of widgets, in fact 2 widgets the spinbox and it's child the line edit) and the rule is that the upper widget get the mouse event. In case of the spinbox it's the text line widget which takes them. The buttons in contrario aren't child widgets it's just a graphical part of the spinbox. it's rendered by the style (QXxxStyle). To resume if you go on text edit the mouse messages go to it, other areas it is its parent - the combobox which gets them. Now of course you should install an event filter to the line edit but it sound all like an hack, rethink more on the way you will implement and probably there is another to handle your problem without to take the mouse events!

but this command not perform! why?

No, but the documentation contains an example on how do that.

Yes, you can read the data again using another toolkit or language. The format of the data is documented. Reading in the data may not be as easy as it would be using Qt again, though.

I think I understand what the problem was. On computers that I use some older programs are installed and they have changed during installation several system files. By default, on clean Windows everything is working fine.

If I remember correctly, you will have to build the plugins separately.

That would work, I guess... It can get pretty messy though. But I think I can make it work using a second non-recursive mutex that is only used to inter-lock my two methods, while the "global" recursive one can still be used everywhere safely... as long as one specific method (illustrated by funcB2 in the example) is not called by another locked method, which should work in my case. Thanks again; I just wanted to be sure I wasn't missing an obvious solution or something.

:) tnx rokemoon tnx to all :)

I'm using your code with just an extra ';' at the first line :P

Yes, it does! Thanks, all!

Contrast in general is not a very simple thing, please check here "Contrast in wiki":http://en.wikipedia.org/wiki/Contrast_(vision) "Histogram egalization":http://en.wikipedia.org/wiki/Histogram_equalization#Histogram_equalization_of_color_images

Or leave it as a snippet in the "wiki":/wiki/Category:Snippets for the time being :)

your welcome, please mark the thread as solved

yes and a lowercase l before the lib name right? exactly like i wrote 2 posts before is my call

You can load libraries after the program start only if the program is not "hard" linked against those and does not need them to start up. This is false for all the Qt libs, it usually works for plugins. QLibrary is just a wrapper around the native dlopen/LoadLibrary functions to ease the latter. You can do some tricks if you don't know exactly what version you are loading. Have a look at Qt's SSL support classes, they late-load the SSL libraries, as there are license issues with OpenSSL.

The drawing/handling of a QScrollBar goes always through the style. Mainly you have no chance to do anything through widget manipulation because there is no children. The only way is through the style, for this you have 2 approachs possible: like you propose using style sheet settings (in fact internally through the QStyleSheetStyle) to define you own QStyle (per ex. inherited of QWindowsStyle).

It depends. If you create an application just for your company and it is just used internally there is no need to release any source code. But if you release the source code or the product to the public you will have to release the source code under the terms of the GPL as well. IANAL.