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  • How do I create an 8-bit PNG with transparency from an NSBitmapImageRep?

    - by Rob Keniger
    I have a 32-bit NSBitmapImageRep which has an alpha channel with essentially 1-bit values (the pixels are either on or off). I want to save this bitmap to an 8-bit PNG file with transparency. If I use the -representationUsingType:properties: method of NSBitmapImageRep and pass in NSPNGFileType, a 32-bit PNG is created, which is not what I want. I know that 8-bit PNGs can be read, they open in Preview with no problems, but is it possible to write this type of PNG file using any built-in Mac OS X APIs? I'm happy to drop down to Core Image or even QuickTime if necessary. A cursory examination of the CGImage docs didn't reveal anything obvious. EDIT: I've started a bounty on this question, if someone can provide working source code that takes a 32-bit NSBitmapImageRep and writes a 256-color PNG with 1-bit transparency, it's yours.

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  • is it possible to create listview inside dialog?

    - by UMMA
    dear friends, i have created a custom dialog class public class NewPost extends Dialog { // functionality } now my requirement is to create listview inside it. i know we can create textboxes,buttons,dropdown list inside it. but in order to create list view we should inherit our class from listActivity class what you suggest is it possible or not if yes then how to achieve this using any interface or what? any help would be appriciated.

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  • Databinding a StructuredPropertyEditor specific to type and target in Spring(Grails) - Selective app

    - by Colin Harrington
    Using Grails 1.2.2, I'm working on binding a structured property (CC expiration Date) to a java.util.Date but only for specific Domain and Commands objects. I've found the StructuredPropertyEditor interface, but the only way that I've found to register it is to use the PropertyEditorRegistrar and register the editor for the java.util.Date class (much like this example) I don't want all of my dates to use my custom StructuredPropertyEditor. How do I apply the StructuredPropertyEditor selectively to specific targets like certain Command & Domain Classes?

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  • How does 'binding' in JSF work?

    - by Roman
    I've created custom component which shows chart. Now I need to make binding support for this component i.e. generated chart-image should be available (as array of bytes) to backing bean via binding mechanism. I'd like to know some general info about binding implementation techniques. Any links and examples are welcome as well. Thanks in advance!

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  • Do a query only if there are no results on previous query

    - by yes123
    Hi guys: I do this query(1): (1)SELECT * FROM t1 WHERE title LIKE 'key%' LIMIT 1 I need to do a second(2) query only if this previous query has no results (2)SELECT * FROM t1 WHERE title LIKE '%key%' LIMIT 1 basically i need only 1 row who got the most close title to my key. Atm i am using an UNION query with a custom field to order it and a LIMIT 1. Problem is I don't want to do the others query if already the first made the result. Thanks

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  • Joomla Multi Vendor Addon

    - by Auxi
    Recently I searched for a free multi vendor Joomla addon for one of the projects I am working on. But I could not be able to find a one. Is there any free multi-vendor addon available or do we need to custom develop an add-on? Thanks in advance...

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  • Setting Busy cursor for the html page with iframes having flex applications

    - by Prashant Dubey
    Hi Friends, I have a html page with 4 iframes out of these 4 one is a static html page and other 3 are html generated by flex. I have a button and list in one of the flex applications and the list will be populated on click of the button. Now what I want is to have a custom busy cursor to appear on the top of the whole html page until the list gets populated. Please tell me if its possible with an example. Thanks in advance Prahsant Dubey

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  • How to extend the Eclipse Java Editor to add coloured overlays

    - by Gavin Clarke
    I have an idea for an Eclipse plugin which I've been toying with. I need to be able to extend the Eclipse Java Editor component and add coloured overlays to the code based on pluggable external metrics. Unfortunately there doesn't appear to be any kind of syntax highlighting extension point. Does anyone know how I might be able to extend the exisitng eclipse Java Editor to add custom highlighting rules? Bear in mind I'm new to Eclipse plugin programming so please give as much detail as possible.

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  • How to implement service layer in Zend Framework?

    - by takeshin
    I'm looking for some good resources to learn how to implement internal service layer in Zend Framework. This is interesting post, but with no concrete code samples. Where to put service classes (/application/modules/modulename/services/?); How to autoload them (custom autoloader?) Most common services (user, authentication, cart, cache, feed?) Sample implementations (any github repos?) Good practices?

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  • How can we set authorization for a whole area in ASP.NET MVC?

    - by CodingTales
    I've an Admin area and I want only Admins to enter the area. I considered adding the Authorized attribute to every controller in the Admin area. Isn't there an elegant solution or is this feature not there in the framework itself? EDIT: I'm sorry, I should to have mentioned this before. I'm using a custom AuthorizedAttribute derived from AuthorizeAttribute.

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  • how to extend wpf combo box to bind data?

    - by Shaihan
    i need to bind a collection of objects to a combo box which i can use in different forms. so i want create a custom control which binds the collection to the combo box? how t do it by extending combo box? also how can i define the ItemData template?

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  • Why is the setContextClassLoader() method placed on Thread ?

    - by Roman
    Why is the setContextClassLoader() method placed on thread ? What different thread have different classloaders? The question is what if i extended a classloader , loaded there some new classes. to the my custom classloader. Now , I want it to be the context classloader , so I call the method (Thread.currentThread().setContextClassLoader(loader)). Are these new classes awailable only in the context of the current Thread ? ( or how does it work ?) Thanks

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  • communication between 2 programs written in different language - Serialization ?

    - by trojanwarrior3000
    when is serialization,marshaling etc required during communication between programs residing across 2 different machines /network/Internet? Suppose I have a client program in java/flash and a server program in C. Can't I implement communication using a custom protocol of my own ? I guess so. When is serialization etc needed?I am aware Java RMI,CORBA etc have these mechanisms. But why? Is it a must? please enlighten me?

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  • why sitecolumn title is blank after feature activation....

    - by Rosh Malai
    After installing using stsadmin, and activating using site UI "Site Collection Feature" these columns shows up but no title is showing for them. So no link is attached. It looks like this. Site Column Type Source Car Custom Columns Single line of text SiteCol1 Single line of text SiteCol1 Single line of text SiteCol1 Date and Time SiteCol1 here is feature.xml here is elements.xml StaticName="Car_VinNumber" xmlns="http://schemas.microsoft.com/sharepoint/"

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  • Creating a mask from a graphics context

    - by Magic Bullet Dave
    I want to be able to create a greyscale image with no alpha from a png in the app bundle. This works, and I get an image created: // Create graphics context the size of the overlapping rectangle UIGraphicsBeginImageContext(rectangleOfOverlap.size); CGContextRef ctx = UIGraphicsGetCurrentContext(); // More stuff CGContextDrawImage(ctx, drawRect2, [UIImage imageNamed:@"Image 01.png"].CGImage); // Create the new UIImage from the context UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext(); However the resulting image is 32 bits per pixel and has an alpha channel, so when I use CGCreateImageWithMask it doesn't work. I've tried creating a bitmap context thus: CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray(); CGContextRef ctx =CGBitmapContextCreate(nil, rectangleOfOverlap.size.width, rectangleOfOverlap.size.height, 8, rectangleOfOverlap.size.width , colorSpace, kCGImageAlphaNone); UIGraphicsGetImageFromCurrentImageContext returns zero and the resulting image is not created. Am I doing something dumb here? Any help would be greatly appreciated. Regards Dave

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  • Change internet explorer security settings.

    - by Gaby
    HI, How can i change internet explorer security settings by code. i want to do the steps below but by code: Tools - Internet Options - Security tab - Custom Level - and change the logon type to Anonymous logon. I think that it can be changed from the registry file but i can't found it.

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  • How to use C# with AIR?

    - by dotnetdev
    I have some basic experience in making Flex sites, but I think I have more use for Flex in making a desktop AIR application. Anyway, I was wondering if it is at least possible to use C# alongside Actionscript/AIR? I can't find any example of this. Also, can I use custom Flash components in a Flex app? I know I can use Javascript components. Thanks

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