I want to play background music continually in a loop until the game ends.
in the header file:
QMediaPlayer * music = new QMediaPlayer();
in the cpp file:
startGame(){
music->setMedia(QUrl("qrc:/sounds/backgroundmusic.mp3"));
music->play(); }
stopGame(){
music->stop(); }
Right now my music plays thru to the end but does not restart. How can I get it to loop over again again?
Is there a QMediaPlayer member I can use, or should I run it in a while loop, or what?
Sounds like what you want is QMediaPlaylist. QMediaPlaylist allows you to control the playback mode, and in this case you would use Loop. This approach has other advantages too, such as CurrentItemInLoop. CurrentItemInLoop will play the current playlist item in a loop, meaning that if you add more songs in the future you can select a song then loop only that track. Thus, you only need a single playlist for most needs. Below is some example code, I do not currently have a means to test it though (No Qt multimedia extensions installed on this machine). Should demonstrate the point reasonably well though.
QMediaPlaylist *playlist = new QMediaPlaylist();
playlist->addMedia(QUrl("qrc:/sounds/backgroundmusic.mp3"));
playlist->setPlaybackMode(QMediaPlaylist::Loop);
QMediaPlayer *music = new QMediaPlayer();
music->setPlaylist(playlist);
music->play();
Related
i'm trying to loop the background music and i always got this SIGSEGV problem that crashed my program. If i remove the QMediaPlaylist playback mode then the program ran just fine.
Here the github link: https://github.com/KhanhSonPham/simplePlaneShooting
QMediaPlaylist * playlist = new QMediaPlaylist();
playlist->setPlaybackMode(QMediaPlaylist::CurrentItemInLoop);
playlist->addMedia(QUrl("qrc:/sounds/engine.mp3"));
playlist->setCurrentIndex(1);
sound = new QMediaPlayer();
sound->setPlaylist(playlist);
sound->play();
error output
This line of code should change to
playlist->setCurrentIndex(0);
Actually you have one item in your playlist. So, it should be on index 0.
I assume that it's a typo but for some information about why C/C++ or many other programming languages use zero-based indices I refer you here.
I am building up a QListWidget, browsing through a directory so that every ".png" gets listed with a preview icon.
The core of my populating loop looks like this:
new QListWidgetItem( QIcon(act_fullname), act_filename);
Right after the whole list is ready, the app crashes.
The error is many times repeated and says this:
On Mac OS X, you might be loading two sets of Qt binaries into the
same process. Check that all plugins are compiled against the right Qt
binaries. Export DYLD_PRINT_LIBRARIES=1 and check that only one set of
binaries are being loaded. QObject::moveToThread: Current thread
(0x103339cb0) is not the object's thread (0x10a848670). Cannot move to
target thread (0x103339cb0)
On Mac OS X, you might be loading two sets of Qt binaries into the
same process. Check that all plugins are compiled against the right Qt
binaries. Export DYLD_PRINT_LIBRARIES=1 and check that only one set of
binaries are being loaded.
Do you have any ideas?
Thanks for your help!
EDIT:
If I skip the icons there is no problem. I have also tried going
QListWidgetItem *item = new QListWidgetItem(act_filename);
ui->listWidget->addItem(item);
item->setIcon(QIcon(act_fullname));
and got no difference.
EDIT 2:
I do not call QObject::moveToThread(QThread*) I don't even use threads (deliberately at least).
Also, the errors appear to come after the loop. I have cout-ed every iteration and the end of the loop and right after my "end loop cout msg" I see that
objc[56963]: Class QCocoaColorPanelDelegate is implemented in both
/Users/Barnabas/QtSDK/Desktop/Qt/4.8.1/gcc/lib/QtGui.framework/Versions/4/QtGui
and
/Users/Barnabas/Programming/Qt/demo_OpenCV-build-desktop-Desktop_Qt_4_8_1_for_GCC__Qt_SDK__Release/demo_OpenCV.app/Contents/MacOS/../Frameworks/QtGui.framework/Versions/4/QtGui.
One of the two will be used. Which one is undefined.
Here, too, I do not use QCocoaColorPanelDelegate. I don't even know what it is ... :(
But here is my more detailed code:
boost::filesystem::path p("/path/to/dir");
if(boost::filesystem::is_directory(p))
{
for(boost::filesystem::directory_iterator it(p); it!=boost::filesystem::directory_iterator(); ++it)
{
if(it->path().extension().string()==".png")
{
std::cout<< it->path() <<std::endl;
QString item_name( it->path.stem().c_str() );
QString screen_file( it->path.c_str() );
QListWidgetItem *item = new QListWidgetItem(item_name);
QIcon *icon = new QIcon(screen_file);
item->setIcon(*icon); // if I comment this one out, everything is fine.
ui->imageList->addItem(item);
}
}
}
I have also tested it with a single .png and the image was displayed properly in the list but crash followed with the very same messages.
I have finally found the solution: manually removed the Debug and the Release directories.
For those whose similar problem is not solved by this see: this link.
I wish to simulate a right click on a file. This is done by opening a Windows Explorer window and then right clicking on it.
The main issue is finding the location of the file in Windows Explorer. I am currently using Autoit v3.3.8.1.
My code 's first line:
RunWait (EXPLORER.EXE /n,/e,/select,<filepath>)
The next step is the problem. Finding the coordinates of the file.
After that, right clicking at that coordinates (it seems to me at this time) is not a problem....
Some background:
OS: Windows 7 64-bit
Software Languages: C#, Autoit (for scripting)
The Autoit script is called by a code similar to that below:
Process p = new Process();
p.StartInfo.FileName = "AutoItScript.exe";
p.StartInfo.UseShellExecute = false;
p.Start();
The code is compiled into a console class file which is run at startup. The autoit script runs as the explorer window opens up.
It seems as though you are taking the wrong approach to the problem, so I'll answer what you are asking and what you should be asking.
First up though, that line of code is not valid, and is not what you want either. You want to automate the explorer window, and RunWait waits for the program to finish. Furthermore you want those items to be strings, that code would never work.
Finding the item in explorer
The explorer window is just a listview, and so you can use normal listview messages to find the coordinates of an item. This is done most simply by AutoIt's GUIListView library:
#include<GUIListView.au3>
Local $filepath = "D:\test.txt"
Local $iPid = Run("explorer.exe /n,/e,/select," & $filepath)
ProcessWait($iPid)
Sleep(1000)
Local $hList = ControlGetHandle("[CLASS:CabinetWClass]", "", "[CLASS:SysListView32; INSTANCE:1]")
Local $aClient = WinGetPos($hList)
Local $aPos = _GUICtrlListView_GetItemPosition($hList, _GUICtrlListView_GetSelectedIndices($hList))
MouseClick("Right", $aClient[0] + $aPos[0] + 4, $aClient[1] + $aPos[1] + 4)
As has already been mentioned, sending the menu key is definitely a better way than having to move the mouse.
Executing a subitem directly
This is how it should be done. Ideally you should never need an explorer window open at all, and everything can be automated in the background. This should always be what you aim to achieve, as AutoIt is more than capable in most cases. It all depends on what item you want to click. If it is one of the first few items for opening the file in various programs, then it is as simple as either:
Using ShellExecute, setting the verb parameter to whatever it is you want to do.
Checking the registry to find the exact command line used by the program. For this you will need to look under HKCR\.ext where ext is the file extension, the default value will be the name of another key in HKCR which has the actions and icon associated with the filetype. This is pretty well documented online, so google it.
If the action is not one of the program actions (so is built into explorer) then it is a little more complex. Usually the best way will be to look at task manager when you start the program and see what it runs. Other things can be found online, for example (un)zipping. Actions like copy, delete, rename, create shortcut, send to... They can all be done directly from AutoIt with the various File* functions.
With more information, it would be possible to give you more specific help.
First, you might want to look at the Microsoft Active Accessibility SDK. In particular look at this interface...
http://msdn.microsoft.com/en-us/library/accessibility.iaccessible.aspx
You can use this to walk the items in the control and find the one with the file name you are looking for and its screen location.
From there, maybe try something like this for simulating the right click.
How can I use automation to right-click with a mouse in Windows 7?
Once you have done the right click, use accessibility again to find the right option on the context menu.
Maybe there's an easier way, you should be able to cobble something together like this if you don't find one. Good luck!
Suppose I have a file named test.txt on D drive. It needs to right click for opening Context Menu. To do this, the following code should work:
Local $filepath = "D:\test.txt"
Local $iPid = Run("explorer.exe /n,/e,/select," & $filepath)
ProcessWait($iPid)
Sleep(1000)
Send('+{F10}')
I need to read the dimensions of a given video file (its width and height), without constructing a video player, like Phonon, e.g. My question is which class I should use to get access to this data. I have already tried using QPixmap and QMovie, but niether of them supports *.mov.
Thank you!
Pavlo, you can try this:
QMediaContent media("myMovie.mov");
QSize resolution = media.canonicalResource().resolution();
The code uses QMediaResource class from Qt Mobility project. I haven't tried it yet and I suppose you need at least a correct backend (plugin that is capable of reading MOV format). I'm giving this answer only from API overview.
Hope this helps.
I finally solved my problem and I thought I'd share my solution with everybody else.
In the class constructor I initialize the following two variables:
media = new Phonon::MediaObject(this);
videoWidget = new Phonon::VideoWidget;
I connect a signal of media to a slot in my class:
connect(media,SIGNAL(stateChanged(Phonon::State,Phonon::State)),
this,SLOT(videoState(Phonon::State,Phonon::State)));
I let the user choose a video file:
QString filename = QFileDialog::getOpenFileName(this,tr("Choose video file"),QDir().homePath(),tr("Video files (*.mov *.mpg *.avi)"));
And apply this file to the media object:
media->setCurrentSource(filename);
Phonon::createPath(media,videoWidget);
Because media object is already connected to a slot, every change in media can be monitored with its help.
void VideoModuleDialog::videoState(Phonon::State newState, Phonon::State oldState)
{
if(newState == Phonon::PlayingState || newState == Phonon::StoppedState)
{
width->setText(QString().number(videoWidget->sizeHint().width()));
height->setText(QString().number(videoWidget->sizeHint().height()));
}
if(newState == Phonon::ErrorState)
{
QMessageBox::critical(this,tr("Video file error!"),
tr("Video file error: ") + media->errorString(),QMessageBox::Ok);
}
}
I must admit, however, that this code seems to me to be quite slow. Phonon library is used in my program only in one place, and this is here, in a dialog window where user can choose a video clip to embed, and i want the video dimensions to be read from file. It takes some time until this dialog window opens, so I guess, this solution is a bit too harsh for my problem. However, I was not able to find another solution. If there are different opinions as to the subject of this post, I'd be glad to hear them.
I'm using the VideoDisplay to play flv's, mov's, and mp4's and everything is working great. They are all being loaded via progressive download and are not being streamed. What I'd like to do is to grab a single specified frame (like whatever is being shown at the 10 second mark), convert it to a bitmap and use that bitmap as the preview image for the video. I'd like to do this at runtime so I don't have to create a preview image for every video that would be shown.
Any idea's on how to do this? I'd rather not fake it by playing it - seeking for that specific frame and then pausing it but I may have no other choice?
Ryan and James are correct -- the right way's probably to extract frames at upload/transcode-time. But if that's not an option, you could opt for using some sort of a default/placeholder image of your own (something generic or somehow suitable for all videos whose thumbs haven't yet been captured), and just use VideoDisplay's DisplayObject-ness to grab and then upload a frame to your server, e.g.:
<mx:Script>
<![CDATA[
var captured:Boolean;
private function creationCompleteHandler(event:Event):void
{
videoDisplay.source = "http://yourserver/yourvideo.flv";
}
private function videoDisplay_playheadUpdate(event:VideoEvent):void
{
if (!captured && videoDisplay.playheadTime >= 10)
capture();
}
private function capture():void
{
var bmpData:BitmapData = new BitmapData(videoDisplay.width, videoDisplay.height);
bmpData.draw(videoDisplay);
captured = true;
// Now just upload the byte array to your server for the next user
var loader:URLLoader = new URLLoader();
loader.dataFormat = URLLoaderDataFormat.BINARY;
// ... etc.
}
]]>
</mx:Script>
<mx:VideoDisplay id="videoDisplay" playheadUpdate="videoDisplay_playheadUpdate(event)" />
Again, it's perhaps not the most elegant solution, but it certainly works. This way, the first user sees the generic image, but every user thereafter gets the generated thumbnail. (Which, of course, you'll have uploaded and properly associated by then.) Make sense?
I'm pretty sure this isn't possible. It may well be... but don't think so. I think the only way to load in video is to use the NetStream and NetConnection object, which as you know just kicks off the loading of the video.
If this is user generated video i think the best bet is to have some serever side script that generates the preview image. Have no idea how this is done but think this is how most clip sites work.
If all the videos are in your control it may be possible to write a script for one of the video editing programs to automate generating the image for a specific frame from a list of files. I think this is probably your best route as alternative that you could get up and running quickly.
Sorry for the vague answer... it may point you in the right direction if you need a quick solution.
I agree with James, the only way to really do this would be to do it with a server side script and pull certain frames out of the video. Even if you could do this with flex, you really would not want to put the burden to do this (which would be processor intensive I would think) on the client machine. Not to mention it will be much more efficient to create the image before hand than to have flex determine the thumbnail to show every time it is loaded.