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  • [WPF] The calling thread cannot access this object because a different thread owns it.

    - by zunyite
    Why I can't create CroppedBitmap in the following code ? I got an exception : The calling thread cannot access this object because a different thread owns it. public MainWindow() { InitializeComponent(); ThreadPool.QueueUserWorkItem((o) => { //load a large image file var bf = BitmapFrame.Create( new Uri("D:\\1172735642.jpg"), BitmapCreateOptions.DelayCreation | BitmapCreateOptions.IgnoreColorProfile, BitmapCacheOption.None); bf.Freeze(); Dispatcher.BeginInvoke( new Action(() => { CroppedBitmap cb = new CroppedBitmap(bf, new Int32Rect(1,1,5,5)); cb.Freeze(); //set Image's source to cb.... }), System.Windows.Threading.DispatcherPriority.ApplicationIdle); } ); }

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  • Getting camera preview data without using a preview callback

    - by velocipedestrian
    I have an app that does some processing to camera preview frames before displaying them to the user. I'm currently using preview callbacks to access the image data, but the problem I have is that the onPreviewFrame() function stops getting called if you start recording video using a MediaRecorder, and I want the processing to continue when video is being recorded. I've tried doing the following: public static Bitmap convertViewToBitmap(View view) { Bitmap bitmap = Bitmap.createBitmap(view.getWidth(),view.getHeight(), Bitmap.Config.ARGB_8888); view.draw(new Canvas(bitmap)); return bitmap; } to convert the preview surface to a bitmap, but when I pass the preview SurfaceView to the function it returns an all-black bitmap (it works when I test it on normal views though). Is there any other way I can access the image data if preview callbacks are not available?

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  • jquery / javascript for a user to select 1 of n images

    - by TesterTurnedDeveloper
    I want to display a few images (probably 5 max) and have a user click to select one. First thing I tried was radio buttons and putting the images inside labels. <input type="radio" name="BackgroundId" id="BackgroundId" value="1" /> <label for="BackgroundId"><img src="../../Content/images/thumb_1.jpg" /></label> Firefox will select the radio button when the user clicks the image, but IE doesn't. Is there a jquery plugin that will make the images clickable? Fancy-form looks like something I could use, but it isn't jquery and I've already got jquery in my project. Or can someone point me to a better way of selecting a single image?

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  • Hide partial background repeat

    - by ComFreek
    Consider these simple CSS rules: jsFiddle div#container { width: 50%; height: 260px; background-image: url('Image.png'); background-repeat: repeat-x; }? The problem is that I only want full images. If there is not enough space for another duplicate, it should NOT be shown. I've never heard that CSS provides a rule for it. So how can I achieve it in JavaScript (jQuery already included)?

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  • Serving CSS from a static domain

    - by Saif Bechan
    I want to serve my css and images from a static cookieless domain. Now my problem is how to point to the images from within my css files. I don't want to program my domain hard within the css file, for example: http://static.com/image.png I would rather have a variable pointing to the the image, so it works for every static domain i use. What is the best way for achieving this. Should i run the whole css file trough php and add the static domain in front of all the png references. A downside in this is that i have to place the whole css in html. Or is there another more optimized way of doing this.

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  • jquery tabs changing on change?

    - by Steven
    Hello, I have two tabs each with different styles and different text. One recent posts and one recent comments the css for each are below with the ones I need to have when they are selected. So pretty much when a user selects the recent comments it will change the entire block to the second one (2). Pretty much changing width, and swapping the css for both tabs. I am currently using idtabs http://www.sunsean.com/idTabs/ My question: How can I have it change the tab css and width for both when the right tab is selected and then back again when the left tab is selected. CSS sideboxtopleft { float: left; width: 121px; height:20px; background-image: url(images/categorysplitter.gif); background-position:top right; background-repeat:no-repeat; text-align: center; padding-top: 10px; margin: 0; } sideboxtopleft2 { float: left; width: 173px; height:20px; background-image: url(images/categorysplitter.gif); background-position:top right; background-repeat:no-repeat; text-align: center; padding-top: 10px; margin: 0; } sideboxtopright { float: right; width: 173px; height: 20px; background-image:url(images/categorybg.gif); text-align: center; padding-top: 10px; margin: 0; } sideboxtopright2 { float: right; width: 121px; height: 20px; background-image:url(images/categorybg.gif); text-align: center; padding-top: 10px; margin: 0; } HTML <div id="sidebox" style="padding: 0px; width:294px;"> <div class="idTabs"> <div id="sideboxtopleft"> <a href="#post"><h3>RECENT POSTS <img src="images/arrow.gif" width="9" height="5" alt="v" border="0" /></h3></a> </div> <div id="sideboxtopright"> <a href="#comments"><h3>RECENT COMMENTS <img src="images/arrow2.gif" width="6" height="9" alt=">" border="0" /></h3></a> </div> </div> <div style="padding: 10px;"> <div id="post"> SUP? </div> <div id="comments"> SUP?>>!?>!! </div> </div> </div> <div id="sidebox" style="padding: 0px; width:294px;"> <div class="idTabs"> <div id="sideboxtopleft2"> <a href="#post2"><h3>RECENT COMMENTS <img src="images/arrow.gif" width="9" height="5" alt="v" border="0" /></h3></a> </div> <div id="sideboxtopright2"> <a href="#comments2"><h3>RECENT POSTS <img src="images/arrow2.gif" width="6" height="9" alt=">" border="0" /></h3></a> </div> </div> <div style="padding: 10px;"> <div id="post2"> SUP? </div> <div id="comments2"> SUP?>>!?>!! </div> </div> </div>

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  • My own HtmlHelper don't work in Asp.Net MVC 2

    - by name1ess0ne
    I have HtmlHelper in ASP.NET MVC 1. Now I wont to migrate to ASP.NET MVC 2, but this helper don't work =( public static string Image(this HtmlHelper helper, string url, string alt) { return string.Format("<img src=\"{0}\" alt=\"{1}\" />", url, alt); } public static string ImageLink<T>(this HtmlHelper helper, Expression<Action<T>> linkUrlAction, string imageUrlPath, string altText) where T : Controller { string linkUrl = helper.BuildUrlFromExpression(linkUrlAction);//compile time error string img = helper.Image(imageUrlPath, altText); string outputUrl = string.Format(@"<a href='{0}'>{1}</a>", linkUrl, img); return outputUrl; } Error: 'System.Web.Mvc.HtmlHelper' does not contain a definition for 'BuildUrlFromExpression' How I can fix this error?

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  • PHP FTP Upload thousands of files

    - by user275074
    Hi, I've written a small FTP class which I used to move files from a local server to a remote server. It does this by checking an array of local files with an array of files on the remote server. If the file exists on the remote server, it won't bother uploading it. The script works fine for small amounts of files, but I've noticed that the local server can have as many as 3000+ image files to transfer, this seems to cause the script to flop and only transfer a 100 or so. How can I modify the script to handle potentially thousands of image transfer files?

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  • How to store images efficiently (memory-wise) while still being able to process them

    - by Sheeo
    I'm working on a silverlight project where users get to create their own Collages. The problem When loading images into memory, I'm using BitmapImage so that they can be displayed directly with the Image control--but they're locked in afterwards. So I've tried storing them seperately aswell, but that just sucks up huge amounts of RAM. So in short, is there a class that'll let me store JPEG images, be able to show them with the image control, and still be able to export it afterwards? All this needs to be efficient--i.e. I'd rather not want any copying to ARGB arrays or use the WriteableBitmap to copy them over. I require to work with large collections of images, up to 300 at most. Any help apreciated!

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  • iPhone + selecting a portion of UIImage using some rectangular frame and than cropping it

    - by pratik
    Hello, I have requirement of selecting a portion of UIImage displayed on iPhone screen (for e.g. selecting the face from the image of some human being) using some rectangular type of frame. It means a rectangular type of frame can be moved across the image to place it at portion that we want. After placing it, I need to resize the frame in order to have that portion completely fit in the frame. Finally, the UIImage should be cropped so that I have a UIImage only displaying the portion that I selected using the frame. Please help me. Regards, Pratik

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  • In an online questionnaire, what is a best way to design a database for keeping track of users all attempts?

    - by user1990525
    We have a web app where users can take online exams. Exam admin will create a questionnaire. A questionnaire can have many Questions. Each question is a multiple choice question (MCQ). Lets say an admin creates a questionnaire with 10 questions. Users attempt those questions. Now, unlike real exams users can attempt single questionnaire multiple times. And we have to keep track of his all attempts. e.g. User_id Questionnaire_id question_id answer attempt_date attempt_no 1 1 1 a 1 June 2013 1 1 1 2 b 1 June 2013 1 1 1 1 c 2 June 2013 2 1 1 2 d 2 June 2013 2 Now it can also happen that after user has attempted same questionnare twice, admin can delete a question from same questionnaire, but users attempt history should still have reference to that so that user can see his that question in his attempt history in spite of admin deleting that question. If user now attempts this changed questionnaire he should see only 1 question. User_id Questionnaire_id question_id answer attempt_date attempt_no 1 1 1 a 3 June 2013 3 Also, after this user modified some part of question, users attempt history should show question before modification while any new attempt should show modified question. How do we manage this at the database level? My first gut feeling was that, For deletes, do not do physical delete, just make a question inactive so that history can still keep track of users attempt. For modifications, create versions for questions and each new attempt refres to latest version of each question and history keeping reference to version of question at attempt time.

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  • How can I suspend \ resume the video caputre operation in v4l2 ?

    - by Ita
    Hi, I use the v4l2 api for video capture and image applying image processing algo' on each frame. I wish to be able to suspend the video capture. I see that there are 2 options for ioctling (new verb, its gonna catch) the stream. VIDIOC_STREAMON, VIDIOC_STREAMOFF will start and stop the stream. Is there a way to suspend \ resume it? Is this even necessary, or can I just use the start and stop controls with no extra processing time spent on creating the stream all over again ? Thank you for your time, Itamar

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  • IE - Color transparent not working

    - by poru
    Hello, I have a problem with the IE (what else?): I generate content with CSS which has also a background-image. I looks like that: #nav ul li:after { content: "--"; position: relative; z-index: 99; background: transparent url(image.png); color: transparent; } The text color is in non-IE-browsers transparent, but in all IE browsers it's black and you could see it. How could I make the text transparent/unvisible? I tried already: visibility - opacity - filter - text-indent ... But none did his job right, either it disappears (with it background which I need) or the attribute doesn't apply.

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  • Permission errors when cropping after taking a photo

    - by CGM
    Hello everybody, I want to take a photo with an Intent on android.provider.MediaStore.ACTION_IMAGE_CAPTURE, next crop the result with: Intent intent = new Intent("com.android.camera.action.CROP"); intent.setClassName("com.android.camera", "com.android.camera.CropImage"); I follow the sugestions made at: Android: Crop an Image after Taking it With Camera with a Fixed Aspect Ratio However when calling the crop activity I get (already checked the LogCat output) a permission error, saying something like: Permission denial on a Intent to access the temporary image created by the camera activity on my SDcard. Can you please suggest a solution for Android 2.2 ? Thank you

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  • Gluing tiles together using imagemagick's montage command

    - by AP257
    This seems like it might be a reasonably common question, so I'm going to ask it using as many keywords as I can think of! I have a bunch of (well, nine) tile jpegs, with standard tile filenames. Each jpeg is 220x175 pixels: (top row) tile_1_0_0.jpg tile_1_1_0.jpg tile_1_2_0.jpg (middle row) tile_1_0_1.jpg tile_1_1_1.jpg tile_1_2_1.jpg (bottom row) tile_1_0_2.jpg tile_1_1_2.jpg tile_1_2_2.jpg How can I use imagemagick/montage to 'glue' or join them all together to make a single, coherent image? I don't want to resize them at all, so I guess the final image should be 660x525. That would be montage with no framing, shadowing, bordering, etc - just the nine original images, glued together to make a single jpeg. I know it should be something along these lines, but I'm struggling with getting the order and sizing right: montage +frame +shadow +label -tile 3x3 -geometry <options> *.jpg joined.jpg

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  • ArrayAdapter Help?

    - by ramsbh
    Hi i want to display a list view in my application. Each row should contains a text and an image. i have used ArrayAdapter to display this, but how to insert an image after the text.Please help ? String lvr[]={"Android","iPhone","BlackBerry","AndroidPeople"}; super.onCreate(savedInstanceState); setContentView(R.layout.main); list1 = (ListView) findViewById(R.id.cg_listview1); list1.setAdapter(new ArrayAdapter<String>(this,R.layout.alerts , lvr)); Here alerts is my layout contains only textView.

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  • dragging components in flex

    - by SuperString
    so I am trying to drag around some images in a canvas. I am adding eventlisteners to the components and calling startDrag() and stopDrag() to pick them up and stuff: component.addEventListener(MouseEvent.MOUSE_DOWN, component.startDrag) The problem is that it is selecting the image at its (0,0) location and not where I initially click on it. So there's a sudden "jump" when I click on the image. It is not smooth. I noticed that startDrag() has two default parameters, one of them is lockCenter and it is default to false. Maybe do I set it equal to true somehow? (I don't know how to pass arguments to my second parameter in addeventlistener) Another question: if I want to add more conditions to it, like make a new function that uses component.startDrag(), how do I pass the component to this function while adding event listener to it at the same time? for example: I want to do: component.addEventListener(MouseEvent.MOUSE_DOWN, some_other_function); where some_other_function uses component.startDrag(); Thanks!

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  • WP7/silverlight Images does not stay within a grid/stackpanel when using the toolkit to provide gesture support

    - by gforg
    I have few buttons and below that I am displaying an image and have used the WP7/Silverlight toolkit to provide support for Gestures. Everything works fine, until i do gestures like pinch and then moving it up/down. Both these gestures work fine but they do not seem to respect the stackpanel/grid the image is present in and they go over that and on top of the buttons. Do u know how to restrict these? I see the following function when gestures are called. private void OnPinchStarted(object sender, PinchStartedGestureEventArgs e) { initialAngle = ImageScaling.Rotation; initialScale = ImageScaling.ScaleX; } private void OnPinchDelta(object sender, PinchGestureEventArgs e) { ImageScaling.Rotation = initialAngle + e.TotalAngleDelta; ImageScaling.ScaleX = ImageScaling.ScaleY = initialScale * e.DistanceRatio; } private void OnDragDelta(object sender, DragDeltaGestureEventArgs e) { ImageScaling.TranslateX += e.HorizontalChange; ImageScaling.TranslateY += e.VerticalChange; }

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  • Is it possible to serve an ASPX page without it setting a cookie on your browser?

    - by Django Reinhardt
    Hi, we're in the process of trying to speed up the performance of our website by serving static content from a cookieless domain. That seems to be going well, but I have a new question: I know that it's "static content" that we're talking about when serving it from a cookieless domain, but we also have static content being served by ASPX pages, specifically images. For example: domain.com/resizeImages.aspx?src=images/image123.jpg&width=400&height=400 Pretty standard stuff, and although it's being served by managed code, it's still a static image. So my question is: Is it ok to serve the resizeImages.aspx image from our cookieless/static domain? And if so, how do I go about stopping ASP.NET from setting a ANONYMOUSASPX cookie every time I try? Thanks for any help!

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  • Webserver for publishing adjusted images

    - by Petr Prikryl
    I want to create webserver which will be receiving data (images probably) from webclients who will be uploading these photos. And then the webserver must execute some graphic programs (client select whichone) to modify the image(s). After the graphic program is done, the results (output image(s)) will be uploaded to the web temp database (by webserver) to publish results of graphic programs. I found the C++ web toolkit (http://www.webtoolkit.eu), but I'm not sure if this is a suitable C/C++ library for me because I haven't any experiences with making C/C++ web apps/servers. Can someone tell me some advice please? The webserver should have some SDK too, for adding next graphic programs. I'm searching only for any C/C++ tools/libraries/etc.

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  • Documents stored in SQL table

    - by vradenburg
    I have a legacy FoxPro application which stores documents in an SQL table in a field with the image datatype. FoxPro accesses the image datatype as a "General" field which can be used to store various files. I have a FoxPro control which interfaces with the General field for modifying/viewing the document that was stored. I need to migrate this control to .NET and make it easy for users to view/modify documents of various types. Does anyone have any suggestions on some ways to go about this or know of things that I'll need to consider for the migration to .NET? I'm pretty sure that I'll need to migrate the field to either a varbinary(max) or FileStream data type.

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  • ScrollTo and toggle div

    - by user1466260
    I'm a big fan ov 8020.com and my goal is to create a porfolio with the same functionality like the one they have. Here is my markup This section should be hidden <section id="work-container"> <div id="work-list-51" class="work-details"> <h1> <div class="close-project"> </div> <div id="work-list-52" class="work-details"> <h1> <div class="close-project"> </div> <div id="work-list-53" class="work-details"> <h1> <div class="close-project"> </div> </section> This section will hold the thumbnails. When you click a thumbnail you will scroll to the top and the div will slidetoggle. <ul id="work-list"> <li id="work-list-51"><a data-page="51" href="#work-list-51"> <img width="230" height="230" alt="Mariann Rosa" src="sites/default/files/styles/square_thumbnail/public/field/image/mariann.jpg"> </a></li> <li id="work-list-52"><a data-page="52" href="#work-list-52"> <img width="230" height="230" alt="Mariann Rosa" src="sites/default/files/styles/square_thumbnail/public/field/image/mariann.jpg"> </a></li> <li id="work-list-53"><a data-page="53" href="#work-list-53"> <img width="230" height="230" alt="Mariann Rosa" src="sites/default/files/styles/square_thumbnail/public/field/image/mariann.jpg"> </a></li> </ul> I have come this far: $(document).ready(function(){ $("#work-list a").click(function(event){ event.preventDefault(); $('html, body').animate ( {scrollTop: $('#top').offset().top}, 800 ); }); $('#work-list a').click(function(e) { $('#work-container > div').hide(); $(this.hash).slideToggle(1600); }); }); It scrolls to top and the div becomes visible but it does not work correctly :)

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