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  • Trying to make a plugin system in C++/Qt

    - by Pirate for Profit
    I'm making a task-based program that needs to have plugins. Tasks need to have properties which can be easily edited, I think this can be done with Qt's Meta-Object Compiler reflection capabilities (I could be wrong, but I should be able to stick this in a QtPropertyBrowser?) So here's the base: class Task : public QObject { Q_OBJECT public: explicit Task(QObject *parent = 0) : QObject(parent){} virtual void run() = 0; signals: void taskFinished(bool success = true); } Then a plugin might have this task: class PrinterTask : public Task { Q_OBJECT public: explicit PrinterTask(QObject *parent = 0) : Task(parent) {} void run() { Printer::getInstance()->Print(this->getData()); // fictional emit taskFinished(true); } inline const QString &getData() const; inline void setData(QString data); Q_PROPERTY(QString data READ getData WRITE setData) // for reflection } In a nutshell, here's what I want to do: // load plugin // find all the Tasks interface implementations in it // have user able to choose a Task and edit its specific Q_PROPERTY's // run the TASK It's important that one .dll has multiple tasks, because I want them to be associated by their module. For instance, "FileTasks.dll" could have tasks for deleting files, making files, etc. The only problem with Qt's plugin setup is I want to store X amount of Tasks in one .dll module. As far as I can tell, you can only load one interface per plugin (I could be wrong?). If so, the only possible way to do accomplish what I want is to create a FactoryInterface with string based keys which return the objects (as in Qt's Plug-And-Paint example), which is a terrible boilerplate that I would like to avoid. Anyone know a cleaner C++ plugin architecture than Qt's to do what I want? Also, am I safely assuming Qt's reflection capabilities will do what I want (i.e. able to edit an unknown dynamically loaded tasks' properties with the QtPropertyBrowser before dispatching)?

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  • Warning: pointer of type 'void *' used in subtraction

    - by idealistikz
    Although it runs correctly, the following results in the aforementioned compiler warning: return ((item - (my->items))/(my->itemSize)); 'item' is a 'void *'; 'my-items' is a 'void *'; 'my-itemSize' is an 'int' Casting 'item' and 'my-items' as an 'int *' caused the program to run improperly. What is the best way to remove the warning?

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  • WP7 - correctly timeing out an observable?

    - by Gaz83
    WP7 APP Using an observable from event, I download the lateset weather from a web service. I tested this out on the phone and emulator at home and it works fine. I brought the project with me to work and ran it using the emulator there. Now i'm not sure it its a firewall or what but it doesn't seem to get the weather, it just sits there for ever trying. So it got me thinking that if there was ever to happen on a phone then I need some kind of timeout in that if it can't get the weather in say 10 - 15 seconds then just give up. Here is the example code so far IObservable<IEvent<MyWeather.GetWeatherCompletedEventArgs>> observable = Observable.FromEvent<MyWeather.GetWeatherCompletedEventArgs>(Global.WeatherService, "MyWeather.GetWeatherCompleted").Take(1); observable.Subscribe(w => { if (w.EventArgs.Error == null) { // Do something with the weather } }); Global.WeatherService.GetWeatherAsync(location); How can I get this to time out safely after a given time if nothing is happening?

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  • removing contents of div using Jquery "empty" doesn't work

    - by Andrew
    I'm trying to remove contents of particular div which are basically list items and a heading by using jquery empty so that I could replace with new contents. What happens when I run the code is, the whole div element blinked and flash the replaced content and then the old one reappear. Can anyone tell me what am I doing wrong? Here's an excerpt of my code - <pre> $("#msg_tab").bind("click",function(){ $("#sidebar1").remove(); var html="<ul><li><h2>test</h2><ul><li><a href='#'>Compose New Message</a></li><li><a href='#'>Inbox</a></li><li><a href='#'>Outbox</a></li><li><a href='#'>Unread</a></li><li><a href='#'>Archive</a></li></ul></li></ul>"; $("#sidebar1").append(html); }); <div id="sidebar1" class="sidebar"> <ul> <li> <h2>Messages</h2> <ul> <li><a href="#">Compose New Message</a></li> <li><a href="#">Inbox</a></li> <li><a href="#">Outbox</a></li> <li><a href="#">Unread</a></li> <li><a href="#">Archive</a></li> </ul> </li> </ul> </div> Another question is, how do I write multiple line html code string in javascript so that java would recognize as a string value? Placing forward slash at the end is ok when the string is not a html code but, in html code, I can't figure out how to escape forward slash from ending tags.I've tried escaping it with backward slash but doesn't work. I would be appreciated if anyone could shed a light on this matter as well.

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  • problem with Infopath web services

    - by AB
    I want to have some url for my infopath form and give that link to user instead of going to form library and click new...how is it possible? Also when I created Infopath form I have given some text fields and button, I don't want the Infopath services buttons(Save,save as...) how I cna remove those? Any suggestions would really be appreciated...Thanks

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  • Whats wrong with this line

    - by Andeeh
    I am trying to remove all the " from a string called s1, I have this line s1=replace (s1, """, "") But i get a complile error saying it is expecting a list seperator or ) How can i fix it? Thanks in advance

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  • Removing the Google Maps API Premier Terms-of-Use/Logo/etc. links?

    - by appr3ntice
    Hi, is it legal to remove the logo/terms of use link displayed on my integrated google map (google maps premier)? The problem is that when I zoom into the map, the link tends to get longer and loger and overlays the whole website which is pretty ugly. Of course it is possible to give the div container a "overflow: hidden;" flag which helps a little. But it is still not satisfying. Thx

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  • When I add meta:resourcekey to LinkButton it hides label contained in link button.

    - by Vinay Pandey
    For the code below:- <asp:LinkButton ID="lbtnTest" runat="server" CssClass="toolbar" CommandArgument="Test" meta:resourcekey="lbtnTest1" OnCommand="ChangeText"> <asp:Literal ID="litTest" Text="My Text" runat="server" meta:resourcekey="litTest" /> </asp:LinkButton> When I remove meta:resourcekey="lbtnTest1" from the link button then litTest is rendered properly whereas if I have meta:resourcekey="lbtnTest1" in link button it doesn't display text for litTest. Any idea what I am doing wrong here?

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  • Setting CPU target to x86 on .NET 2.0 project adds .NET 3.5 dependencies.

    - by AngryHacker
    I have a project in VS2008 that targets .NET 2.0 framework. It was original set to build for AnyCPU. I changed it to x86 and for whatever reason, VS adds the following lines to .csproj: <ItemGroup> <BootstrapperPackage Include="Microsoft.Net.Client.3.5"> <Visible>False</Visible> <ProductName>.NET Framework Client Profile</ProductName> <Install>false</Install> </BootstrapperPackage> ... ... <BootstrapperPackage Include="Microsoft.Net.Framework.3.5.SP1"> <Visible>False</Visible> <ProductName>.NET Framework 3.5 SP1</ProductName> <Install>false</Install> </BootstrapperPackage> </ItemGroup> Can someone explain as to why this is being added and whether I can safely remove it, as I still have to target the .NET 2.0 framework. Thanks.

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  • To Make an item wiggle and delete

    - by gbf.sara
    I need to delete/remove an item in my Iphone application. For that i should make tat item wiggle(shake) when i give long press. And then it should ask for an alert to delete or not??? Can anyone guide me plz??? It ll be more helpful if u help me with a source code Tanx in advance

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  • JFrame does not refresh after deleting an image

    - by dajackal
    Hi! I'm working for the first time with images in a JFrame, and I have some problems. I succeeded in putting an image on my JFrame, and now i want after 2 seconds to remove my image from the JFrame. But after 2 seconds, the image does not disappear, unless I resize the frame or i minimize and after that maximize the frame. Help me if you can. Thanks. Here is the code: File f = new File("2.jpg"); System.out.println("Picture " + f.getAbsolutePath()); BufferedImage image = ImageIO.read(f); MyBufferedImage img = new MyBufferedImage(image); img.resize(400, 300); img.setSize(400, 300); img.setLocation(50, 50); getContentPane().add(img); this.setSize(600, 400); this.setLocationRelativeTo(null); this.setVisible(true); Thread.sleep(2000); System.out.println("2 seconds over"); getContentPane().remove(img); Here is the MyBufferedImage class: public class MyBufferedImage extends JComponent{ private BufferedImage image; private int nPaint; private int avgTime; private long previousSecondsTime; public MyBufferedImage(BufferedImage b) { super(); this.image = b; this.nPaint = 0; this.avgTime = 0; this.previousSecondsTime = System.currentTimeMillis(); } @Override public void paintComponent(Graphics g) { Graphics2D g2D = (Graphics2D) g; g2D.setColor(Color.BLACK); g2D.fillRect(0, 0, this.getWidth(), this.getHeight()); long currentTimeA = System.currentTimeMillis(); //g2D.drawImage(this.image, 320, 0, 0, 240, 0, 0, 640, 480, null); g2D.drawImage(image, 0,0, null); long currentTimeB = System.currentTimeMillis(); this.avgTime += currentTimeB - currentTimeA; this.nPaint++; if (currentTimeB - this.previousSecondsTime > 1000) { System.out.format("Drawn FPS: %d\n", nPaint++); System.out.format("Average time of drawings in the last sec.: %.1f ms\n", (double) this.avgTime / this.nPaint++); this.previousSecondsTime = currentTimeB; this.avgTime = 0; this.nPaint = 0; } } }

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  • Why would an error get thrown inside my try-catch?

    - by George Johnston
    Why would my try-catch block still be throwing an error when it's handled? Exception Details: System.NullReferenceException: Object reference not set to an instance of an object. Try Here >> : _MemoryStream.Seek(6 * StartOffset, 0) _MemoryStream.Read(_Buffer, 0, 6) Catch ex As IOException // Handle Error End Try Edit: Cleaned the question up to remove the extraneous information.

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  • Prototype Add Class to Class

    - by a1anm
    I have a few div's like this in my page: <div class="listing-type-list catalog-listing"> I would like to append a class to the div when I hover over it then remove it when I mouseout? How can this be done with prototype?

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  • change process windows style

    - by Suriyan Suresh
    I start IE as a process and then i would like to change the following properties of a process. remove title bar, toolbar of a process (if IE) set top,left location and size through c# prevent process from minimizing , i have used the following code but had no luck(find the handle of the process and then pass it to below function) public void SetFormOnDesktop(int hwnd) { int hwndf = hwnd; IntPtr hwndParent = FindWindow("ProgMan", null); SetParent(hwndf, hwndParent); }

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  • Sanitising user input using Python

    - by Steve
    What's the best way to sanitise user input for a Python-based web application? Is there a single function to remove HTML characters and any other necessary characters combinations to ensure that an XSS or SQL injection attack isn't possible?

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  • <a> </a> in blue print

    - by Alexandr
    If i include blueprint all my link in page looks like (if it was link on google.com) google(http://google.com)+ all unerline but but if i remove blue print links looks fine without brackets ? what it can be ??

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  • how to set objectForKey to UISwitch to access switch for save selected option

    - by Rkm
    SystemUIViewcontroller has button event. Tap on Button fire InfoTableviewController. InfoTableview has UISwitch. How to set objectForKey to Info to access UIswitch ViewDidload of System... - (void)viewDidLoad { [super viewDidLoad]; self.Infoarray = [NSMutableArray array]; Info *info = [[Info alloc]initWithNibName:@"Info" bundle:nil]; [self.Infoarray addObject:[NSDictionary dictionaryWithObjectsAndKeys:info, @"viewController", nil]]; } SystemUIviewcontroller button event... -(IBAction) Info_Button_Clicked:(id) sender { Info *info = [[Info alloc]initWithNibName:@"Info" bundle:[NSBundle mainBundle]]; [self.navigationController pushViewController:info animated:YES]; [info release]; } Here for Info TableviewController... - (void)viewDidLoad { [super viewDidLoad]; self.Soundarray = [NSArray arrayWithObjects: [NSDictionary dictionaryWithObjectsAndKeys: @"Sounds", @"labelKey", self.SoundsswitchCtl, @"viewKey", nil],nil]; } // Customize the appearance of table view cells. - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { UITableViewCell *cell = nil; if ([indexPath section] == 0) { static NSString *kDisplayCell_ID = @"DisplayCellID"; cell = [self.tableView dequeueReusableCellWithIdentifier: kDisplayCell_ID]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier: kDisplayCell_ID] autorelease]; cell.selectionStyle = UITableViewCellSelectionStyleNone; } else { // the cell is being recycled, remove old embedded controls UIView *viewToRemove = nil; viewToRemove = [cell.contentView viewWithTag:1]; if (viewToRemove) [viewToRemove removeFromSuperview]; } cell.textLabel.text = [[self.Soundarray objectAtIndex: indexPath.row] valueForKey:@"labelKey"]; UIControl *control = [[self.Soundarray objectAtIndex: indexPath.row] valueForKey:@"viewKey"]; [cell.contentView addSubview:control]; return cell; } } - (UISwitch *)SoundsswitchCtl { if (SoundsswitchCtl == nil) { CGRect frame = CGRectMake(198.0, 12.0, 94.0, 27.0); SoundsswitchCtl = [[UISwitch alloc] initWithFrame:frame]; [SoundsswitchCtl addTarget:self action:@selector(switch_Sounds:) forControlEvents:UIControlEventValueChanged]; // in case the parent view draws with a custom color or gradient, use a transparent color SoundsswitchCtl.backgroundColor = [UIColor clearColor]; [SoundsswitchCtl setAccessibilityLabel:NSLocalizedString(@"StandardSwitch", @"")]; SoundsswitchCtl.tag = 1; // tag this view for later so we can remove it from recycled table cells } return SoundsswitchCtl; }

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  • Unit Test Event Handler

    - by Thomas Tran
    I got this event handle and how can I do unit test for this public class MyLearningEvent { private event EventHandler _Closed; public event EventHandler Closed { add { _Closed -= value; _Closed += value; } remove { _Closed -= value; } } public void OnClosed() { if (_Closed != null) _Closed(this, EventArgs.Empty); } } Just modified code so that much clear Thanks

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