winforms pdf 417 reader

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winforms pdf 417 reader

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In digital media processing, you can think of a sample as a discrete collection of bytes at any specific time point along the timeline over which the media plays. If you think of digital video as a collection of discrete frames, a sample for that video stream at a time point is the bitmap that represents the frame at that time point. When you are finished passing all the necessary metadata attributes, the MediaElement begins playing your media. The process of playing your media involves the MediaElement asking for samples of the media from your MediaStreamSource-derived class through the GetSampleAsync() method. The MediaElement passes the stream for which it is requesting samples using a parameter of the MediaStreamType enumerated type to the GetSampleAsync() method. Consequently, if you receive MediaStreamType.Video, the MediaElement is expecting the next sample for the video stream; MediaStreamType.Audio indicates that you need to return the next sample in the audio stream.

public void whenPopup(OpenEvent evt){ if (evt.isOpen()) { Component x = (Component) evt.getReference(); Item loc = (Item) x.getParent().getAttribute("item"); Popup popup = (Popup) evt.getTarget(); popup.getChildren().clear(); Map arg = new HashMap(1); arg.put("item", loc); Executions.createComponents("/popup.zul", popup, arg); } }

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As before, the API supports asynchronous completion. The sample request from the MediaElement can be completed by calling MediaStreamSource.ReportGetSampleCompleted(), either synchronously before returning from GetSampleAsync() or from somewhere else in your MediaStreamSource code in an asynchronous fashion. MediaStreamSource.ReportGetSampleCompleted() accepts one parameter of type MediaStreamSample. The following snippet shows the constructor for the MediaStreamSample type: public MediaStreamSample(MediaStreamDescription mediaStreamDescription, Stream stream, long offset, long count, long timestamp, IDictionary<MediaSampleAttributeKeys, string> attributes); As you can see, the first parameter is of type MediaStreamDescription. This parameter must match the MediaStreamDescription you constructed and returned in ReportOpenMediaCompleted() for the stream concerned. It does not have to be the same instance (it could be), but the MediaStreamDescription.Type property and the MediaStreamDescription.MediaAttributes collection property need to return the same values as were reported by you when the media was initialized. The parameter named stream of type Stream points to the actual data stream for the media you are sampling, the offset parameter indicates the byte offset in that stream where the MediaElement should begin reading the sample, the count parameter indicates the byte length of the sample, and the timestamp parameter is an optional timestamp for the sample in ticks. The last parameter, attributes, is a dictionary of string-formatted attribute values for the specific sample, keyed by the values in the System.Windows.Media.MediaSampleAttributeKeys enumerated type. The MediaSampleAttributeKeys enumerated type has the following values defined: MediaSampleAttributeKeys.KeyFrameFlag: If the sample you are returning represents a keyframe, then this can be set to true. MediaSampleAttributeKeys.DRMInitializationVector: This is the set of values required to decrypt a DRM-encrypted sample. MediaSampleAttributeKeys.FrameWidth: This is the width in pixels of the frame the sample represents. It applies to video samples only. MediaSampleAttributeKeys.FrameHeight: This is the height in pixels of the frame the sample represents. This applies to video samples only.

3. Or, as Alfred North Whitehead put it, It is a profoundly erroneous truism, repeated by all copy books and by eminent people when they are making speeches, that we should cultivate the habit of thinking of what we are doing. The precise opposite is the case. Civilization advances by extending the number of important operations which we can perform without thinking about them. From An Introduction to Mathematics (1911).

Based on the length of time it takes your code to extract and return the next sample, you may or may not choose to report progress. MediaStreamSource.ReportGetSampleProgress() lets you report the progress of your sample extraction effort to the MediaElement. The only parameter to ReportGetSampleProgress() is a double named bufferingProgress, which represents the percentage of the work done. This is ultimately exposed by the MediaElement.BufferingProgress property that you can display in the UI.

In this sample, you use a DataGrid bound to product data fetched from the AdventureWorks WCF service. The Product class exposes a Color property, which is defined as a String on the class. You bind the Color property to one of the DataGrid columns and thereby create a more intuitive interface where the user can actually view the color itself for both viewing and editing the Color value, as compared to the default string editing experience exposed by the DataGridTextColumn. Listing 5-10 shows the XAML. Listing 5-10. XAML for the MainPage Used to Demonstrate Custom DataGrid Column Templates <UserControl x:Class="Recipe5_6.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:data= "clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data" xmlns:local="clr-namespace:Recipe5_6" Width="800" Height="400" >

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