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.
Related
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();
I've tried the simple program for my exercise but if i compiled, it turned give a message "No Way to get the console handle" (Dev-Pascal).
Here's my code:
program square;
uses crt;
var
side,circumference,broad:real;
begin
write('Input the side value of the square: ');
readln(side);
circumference := 4 * side;
broad := side * side;
writeln('The circumference value of the square = ', circumference);
writeln('The abroad value of the square = ', broad);
writeln();
write('Press any key...');
readkey();
end.
thank you for helping and teaching me
i would appreciate
Dev-pascal comes with a 10+ years old Free Pascal version. I really have no idea. Try to run the example on the cmdline to see if dev-pascal is the cause or something else. Temporarily disable security software might also be something to try.
I suppose, you've created a Window Skeleton project.
It has it's description: A Windows skeleton application (no window).
In this case you'll get this error though you code compiles (I've got this error too with your code).
Try to create Console Application project which has it's own description: A standard console-based (MS-DOS) application (Your code has compiled and the program worked as well).
P.S. Can't say what exactly happens -- couldn't find any documentation about errors in Dev-Pas (1.9.2).
My assumption is that skeleton program doesn't imply console window for execution program while console application does.
just close the project and then re-open the pascal source file (.pas). And maybe put "readln;" just before "END.".
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'm looking for a good tutorial on how to use modeltest to test models based on QAbstractItemModel. I don't know how to interpret debug messages that are displayed.
Also I'm having trouble configuring modeltest project to work with my app in QtCreator. Including the .pri/.pro doesn't work. I get an error saying "No rule to mage target ..". After fixing paths in modeltest/modeltest.pro file it starts to compile. But i get this wierd assertion
ASSERT: "QTest::testLogger" in file c:\ndk_buildrepos\qt-desktop\src\testlib\qtestlog.cpp, line 232
Any ideas why this happens ?
My modeltest folder is located inside my project. I added following line at the end of my *.pro file
include(modeltest/modeltest.pri)
The modeltest.pri file contains the following
load(qttest_p4)
SOURCES += modeltest/modeltest.cpp modeltest/dynamictreemodel.cpp
HEADERS += modeltest/modeltest.h modeltest/dynamictreemodel.h
I modified my code to use modeltest this way
model = new TasksModel(this);
new ModelTest(model, this);
ui->treeView->setModel(model);
TasksModel is my implementation of QAbstractItemModel model.
ui->treeView is the widget that displays data.
No other modifications where made while integrating modeltest with my app.
Qt version is 4.7.
This will sound a little overgeeky - but it is, in fact, what the ModelChecker dev intended for you to do ;) When you hit one of the asserts, go to the point in the code where it is hit and read the comments which are written along with it. The entire thing is extremely heavily commented, and describes what is breaking and likely reasons why. This is by far easiest to do if you run your app through a GUI debugger, such as that included in for example KDevelop, Qt Creator or Visual Studio.
The reason you are getting this error is because you aren't actually using the ModelTest inside a proper QTestLib test case. If you take a look at /tests/auto/modeltest (where you presumably got the modeltest class in the first place), you can see how to properly construct a test case using the ModelTest.
I am trying to work with browseForOpenMultiple function inside Flex, sdk 3.5, I am trying to figure out a bug. The browseForOpenMultiple does not crash everytime, but it seems as though I can upload a file once, but when I go to upload a second file, it crashes when the browseForOpenMultiple function is called. Anyone have any ideas about possible causes?
Update:
private function browseForFiles():void
{
fileBrowser = new File();
fileBrowser.addEventListener(FileListEvent.SELECT_MULTIPLE, filesSelected);
fileBrowser.addEventListener(Event.CANCEL, fileSelectionCancelled);
fileBrowser.browseForOpenMultiple("Select Desired Media File(s)", [(mode == "Media")? MediaTypes.getFileFilter() : MediaTypes.getVideoFilter()]);
}
So the code in our array of file extensions was crashing when there were over 60 items listed in an array that gets converted into a string for the FileFilter. This may not be an Adobe limit, but I wanted to make mention that the crash is fixed, so that others who may be encountering issues with browseForOpenMultiple will know what the issue was for this problem. This is not code that I originally wrote, so I will check into it for more clues, but for the time being, too many array items being joined together into a string for FileFilter object caused the crash.
It could be how it's construct the File, without a real file reference.
Try something like this :
var fileBrowser = File.desktopDirectory