.NET (Core and Framework)

Luc Pattyn14-Sep-10 12:00

14-Sep-10 12:00

Ray Cassick wrote:
I am lazy right now

I'm not in a habit of answering lazy questions, I'll keep it short: nothing is guaranteed. A managed thread is as much as "a job that could be executed independently of other jobs within the same process", which means it needs synchronization if other threads are to produce data it needs or consume data it generates, and which also means it does not even have to map onto a "physical" thread. Yes, a new Thread instance may or may not imply a new thread (at least so says the doc, I haven't ever noticed any of this).

And unmanaged threads will be scheduled by the (Windows) kernel as it sees fit, based on CPU activity, thread readiness, thread priority, some fairness measures, and the like. And particularly in Windows with a minimum of guarantees. Starting a thread is like double-clicking an EXE file: it will eventually cause something to happen.

There clearly must be a more overall question, however you forgot to ask it I'm afraid.

Smile | :)

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The Man from U.N.C.L.E.14-Sep-10 12:37

The Man from U.N.C.L.E.

14-Sep-10 12:37

It probably gets even crazier in .Net 3 and above as managed threads are generally serviced by a central threadPool, and you just get the next one to stick up it's hand and admit to not doing any work at the moment. It will then start when it is ready. If the pool is empty the framework just extends the pool, calls a party and a whole load more threads become available... Not unlike the highfliers of the hollywood party scene.

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Luc Pattyn14-Sep-10 13:47

14-Sep-10 13:47

Did that actually happen in 3.0? I was under the impression 3.0 and 3.5 didn't change anything to what already existed in 2.0, it just added functionality. It would be more likely to hold true since 4.0 but I haven't observed (nor tested or analyzed) these aspects, I just have known all along it was going to happen someday, as it is in MSDN doc since day 1.

Smile | :)

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The Man from U.N.C.L.E.14-Sep-10 22:28

The Man from U.N.C.L.E.

14-Sep-10 22:28

Depends.

3.0 introduced the ThreadPool but you could still do it the same old way if you wanted. Not sure about 4.0.

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Ennis Ray Lynch, Jr.15-Sep-10 4:20

Ennis Ray Lynch, Jr.

15-Sep-10 4:20

Threads can be expected to start and threads can be expected to stop(maybe). All other assumptions are not thread safe.

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Loading of the image from a TIFF-file compressed by a JPEG algorithm

Ray Cassick15-Sep-10 5:19

Ray Cassick

15-Sep-10 5:19

Yeah, I figured... and honestly I am not surprised, especially now days with the progression from simple clock allocation over to physical core style allocation.

Just makes me wonder if REAL multi-threading, outside of the typical ‘I just want to be able to do a few things at a time to help increase efficiency’ is really used today except for some very time-critical systems.

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Degun14-Sep-10 3:35

Degun

14-Sep-10 3:35

.NET 3.5
At loading of the map of a TIFF-file compressed by a JPEG algorithm in class Bitmap according to a code:

<br />
//the File path <br />
string sFileName = "C:\Test.tif"; <br />
//workflow Creation <br />
FileStream m_WorkFileStream = new FileStream (sFileName, FileMode. Open, FileAccess. Read, FileShare. ReadWrite | FileShare. Delete); <br />
//to Load the map <br />
Bitmap m_pBitMap = new Bitmap (m_WorkFileStream);<br />

There is an elimination on the last line «Parameter is not valid». How it is necessary to load the map from a TIFF-file contracted by a JPEG-compression?

File example on http://ifolder.ru/19301311

Re: Loading of the image from a TIFF-file compressed by a JPEG algorithm

Dave Kreskowiak14-Sep-10 4:07

Dave Kreskowiak

14-Sep-10 4:07

GDI+ doesn't support JPEG compressed (LZW) TIFF files.

You'll have to use a third party library to handles images of this type.

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Problems with embed windows media player in VB.net form

ocabrera7013-Sep-10 14:11

ocabrera70

13-Sep-10 14:11

Hi. I'm using an embed windows media player in a windows form in vb.net.

The Media Player has the uiMode = none. The Media Player Control has a fixede size of width = 480 and height =320

The videos plays fine, but when i pause a video(with a button of my form) the windows media player change its size without any reason. it happens sometimes when the video starts too. Does Anybody know why this is happening and how can i fix it?.

Please forgive my english. I need help. Any suggestions or article you know about this topic.

Thanks.

Theory and practice of XML layout?

Gregory Gadow13-Sep-10 10:39

13-Sep-10 10:39

For a side project I am working on, I want to write a layout engine for a very simplified, light-weight mark-up language that will be used for writing hypernovels, also known as interactive fiction (read a page, click on one of the links on the page, and follow the story depending on where the link leads.) For flexibility, I would rather try and write my own engine rather than rely on HTML or XSL transformation.

The mark-up of the page text has <p>, <strong>, <em> and <hr/> tags, which work just like HTML. I am also adding a <high> (highlight) tag which will normally underline text, and a <link> tag to replace the HTML <a> tag (to avoid confusion over very different attributes.) Right now, I am only interested in finding a technique for doing the layout, but eventually the reader will be able to set preferences such as font family, font size and color.

The approach I am working on now is to parse the text into blocks with various rendering styles, use DrawString to write the blocks onto a custom control out one by one, then make a note as to the location of where the last block ended to be the starting location of the next block. The pages would be pre-validated before the book file is created, so I don't need to worry about missing or misaligned tags.

I have tracked down some open source materials, such as the Gecko engine used in Firefox. Unfortunately, the source code has all been complete browser implementations, and I don't really have the time to go through and try to separate the layout engine from JavaScript support, managing plug-ins and gracefully handling cantankerous web servers that have been running for 20 years. What can I say, I'm lazy like that.

Any suggestions as to technique, books, web sites, etc. that present the theory and practice of laying out and rendering marked-up text would be much appreciated. I have a strong preference for VB.Net or C# code, but anything that I can translate into .Net will be welcome, as would materials discussing the theory without the practice.

PIEBALDconsult13-Sep-10 17:39

PIEBALDconsult

13-Sep-10 17:39

Gregory.Gadow wrote:
use DrawString to write the blocks onto a custom control out one by one

I would try a RichTextBox first --

Gregory.Gadow wrote:
I'm lazy like that

Gregory Gadow14-Sep-10 5:06

14-Sep-10 5:06

I have considered using a RichTextBox, but I figured that would mean translating the page into RTF first, which paints me into a corner I would rather avoid.

Luc Pattyn14-Sep-10 5:17

14-Sep-10 5:17

Creating an HTML document and feeding it to a WebBrowser would be easier than creating RTF.

Smile | :)

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Gregory Gadow15-Sep-10 3:50

15-Sep-10 3:50

That may be what I end up doing. I was particularly keen on creating a custom link tag; if I write the project in HTML then I will have to have each and every page -- potentially hundreds of them for a full novel -- as separate page files, and managing the network of links becomes unwieldy. My own mark-up would let me design a tag that could pull a page out of a compiled data store, and other tags to efficiently encode meta-data.

Luc Pattyn15-Sep-10 5:41

15-Sep-10 5:41

You could have virtual HTML pages by using an embedded web server; in such scheme your browser gets a page from the built-in server, which does whatever it takes to generate the HTML page on the spot; there is no need to have all the HTML pages ready beforehand.

I've done this, based on the ideas from a CodeProject article, unfortunately the link does no longer work: http://www.codeproject.com/KB/IP/CSHTTPServer.asxp[^]. Search for embedded HTTP server I'd say.

Smile | :)

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Gregory Gadow15-Sep-10 6:02

15-Sep-10 6:02

The ultimate idea is to have a single desktop or mobile application and a library of hypernovel files, much like a ebook reader and a collection of .epub files. The challenge I am looking to solve is that readers load the entire file, while I want to load a single arbitrary page. If there is a server, it would be built into the reader app.

The virtual HTML idea sounds promising, though; I will do some research in that direction. Thanks.

PIEBALDconsult14-Sep-10 17:59

PIEBALDconsult

14-Sep-10 17:59

The control does that for you.

(Easier than trying to draw on something.)

Gregory Gadow15-Sep-10 3:46