alex s - Page 61 - Developer IT

List of known bugs in C# compiler

- by Alex Yakunin

Is there such a list? I don't expect to get a complete one, but the list of most well-known ones must be enough.

Forcing Arrange in a Custom WPF Canvas

Hello, I'm working on a project that involves creating a custom graphical editor. The graphical editor has multiple tabs, and I want to create a preview function that will show a popup with Bitmap previews of the content of each of the tabs. However, the problem I'm running into is that the content for each of the tabs must be arranged before a proper preview can be generated for it. This means going into each of the tabs to ensure that they're rendered and arranged. Then, and only then, do the previews get properly generated, otherwise the previews have a size of 0x0. Does anybody know how to force an arrange of a content control so that I can get a properly sized preview generated ?

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How to map code points to unicode characters depending on the font used?

- by Alex Schröder

The client prints labels and has been using a set of symbolic (?) fonts to do this. The application uses a single byte database (Oracle with Latin-1). The old application I am replacing was not Unicode aware. It somehow did OK. The replacement application I am writing is supposed to handle the old data. The symbols picked from the charmap application often map to particular Unicode characters, but sometimes they don't. What looks like the Moon using the LAB3 font, for example, is in fact U+2014 (EM DASH). When users paste this character into a Swing text field, the character has the code point 8212. It was "moved" into the Private Use Area (by Windows? Java?). When saving this character to the database, Oracle decides that it cannot be safely encoded and replaces it with the dreaded ¿. Thus, I started shifting the characters by 8000: -= 8000 when saving, += 8000 when displaying the field. Unfortunately I discovered that other characters were not shifted by the same amount. In one particular font, for example, ž has the code point 382, so I shifted it by +/-256 to "fix" it. By now I'm dreading the discovery of more strange offsets and I wonder: Can I get at this mapping using Java? Perhaps the TTF font has a list of the 255 glyphs it encodes and what Unicode characters those correspond to and I can do it "right"? Right now I'm using the following kludge: static String fromDatabase(String str, String fontFamily) { if (str != null && fontFamily != null) { Font font = new Font(fontFamily, Font.PLAIN, 1); boolean changed = false; char[] chars = str.toCharArray(); for (int i = 0; i < chars.length; i++) { if (font.canDisplay(chars[i] + 0xF000)) { // WE8MSWIN1252 + WinXP chars[i] += 0xF000; changed = true; } else if (chars[i] >= 128 && font.canDisplay(chars[i] + 8000)) { // WE8ISO8859P1 + WinXP chars[i] += 8000; changed = true; } else if (font.canDisplay(chars[i] + 256)) { // ž in LAB1 Eastern = 382 chars[i] += 256; changed = true; } } if (changed) str = new String(chars); } return str; } static String toDatabase(String str, String fontFamily) { if (str != null && fontFamily != null) { boolean changed = false; char[] chars = str.toCharArray(); for (int i = 0; i < chars.length; i++) { int chr = chars[i]; if (chars[i] > 0xF000) { // WE8MSWIN1252 + WinXP chars[i] -= 0xF000; changed = true; } else if (chars[i] > 8000) { // WE8ISO8859P1 + WinXP chars[i] = (char) (chars[i] - 8000); changed = true; } else if (chars[i] > 256) { // ž in LAB1 Eastern = 382 chars[i] = (char) (chars[i] - 256); changed = true; } } if (changed) return new String(chars); } return str; }

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XNA .FBX Vertex Color Missing

- by Alex

When I vertex paint and export my models from Blender (or Maya) for use in my XNA 4.0 project, I somehow lose the vertex color channel for the model. I use no custom model object or content pipelines and my own shader throws me the error: The current vertex declaration does not include all the elements required by the current vertex shader. Color0 is missing. I tryed to reopen the model in other modeling tools and the vertex colors are there. What could cause the vertex color channel to not get loaded in XNA 4.0? Here's a temporary link to the FBX file(server refuses to send a fbx, so rename the .jpg file to .fbx after downloading) http://resources.gamestack.org/BananaBush.jpg

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How to automatically re-run deadlocked transaction? (ASP.NET MVC/MS SQL)

- by Alex

I have a very popular site in ASP.NET MVC/MS SQL, and unfortunately a lot of deadlocks occur. While I'm trying to figure out why they occur via the SQL profiler, I wonder how I can change the default behavior of MS SQL Server when doing the deadlocks. Is it possible to re-run the transaction(s) that caused problems instead of showing the error screen?

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Google Maps custom marker - can the iframe accept one like the static maps?

- by alex

I was reading the static maps API, and it says you can include a custom marker in the GET params. You simply link to an image file. I now have a second Google Map within an iframe, and was wondering if you can attach custom markers via the GET params to it? Here is the src attribute of the iframe currently. http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=111+Fake+Street+Noosaville+Queensland+Australia&ie=UTF8&output=embed I can't seem to find the documentation on how to do this, if possible. Is this possible?

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How do I write this URL in Django?

- by alex

(r'^/(?P<the_param>[a-zA-z0-9_-]+)/$','myproject.myapp.views.myview'), How can I change this so that "the_param" accepts a URL(encoded) as a parameter? So, I want to pass a URL to it. mydomain.com/http%3A//google.com

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'How decode my encode xml data?

- by Alex

Hi <% 'Stage 1 datas=Server.URLencode("<PaginationData currentPage=""1"" totalPages=""9""/>") response.write "Encode = " datas &"</br></br>" 'Stage 2 response.write "Decode = " 'How i again decode my encode data? %> In the "Stage 1" , i encode my xml data In the "Stage 2", How i decode the "Stage 1" Encode data? hoping your support

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Round bottom corners on Android Bitmap?

- by alex

Hey all, what would be best practice for clipping the bottom borders of a Bitmap? Just manipulate the Bitmap itself or overlay an alpha mask drawable or ...? The whole story: I've a Listview which looks like the iPhone's grouped UITableView style. I would like to display a Bitmap in the last row, but for now the Bitmap overlaps my custom background drawable of the Listview cell. Thx in advance!

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Straight Java/Groovy versus ETL tool (Talend/etc) - what libraries would you use?

- by Alex R

Assume you have a small project which on the surface looks like a good match for an ETL tool like Talend. But assume further, that you have never used Talend and furthermore, you do not trust "visual programming" tools in general and would rather code everything the old fashioned way (text on a nice IDE!) with the help of an appropriate language & support libraries. What are some language patterns & support libraries that could help you stay away from the ETL tool temptation/trap?

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How do I make PyScripter work? Says it cant find python26.dll

- by Alex

I installed PyScript to try it out but it just wont start. It only gives me the error: "Error126: Could not open Dll "python26.dll" followed by: "Python could not be properly initialized. We must quit." I think this may have something to do with the PYTHONPATH but since I'm a newbie and dont know what it is or exactly what to put in the PYTHONPATH, after some googling, I ask here. Also, when I tried to install wxPython it was impossible becouse the PYTHONPATH could not be found.(Just a side note) I have installed ActivePython 2.6 and the PATH is set so I can access python in cmd.

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Force close when starting new activity

- by Alex

I'm trying to launch a new activity from my main activity, but I just get error codes all the time. Heres my main activity; public class gunstats extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Button button4 = (Button)findViewById(R.id.button4); button4.setOnClickListener(new Button.OnClickListener() { public void onClick(View v) { Intent intent = new Intent(gunstats.this, more.class); startActivity(intent); } }); } } and the activity that is being called from my main class; public class more extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); final MediaPlayer mp = MediaPlayer.create(this, R.raw.deagle); Button buttonm1 = (Button)this.findViewById(R.id.buttonm1); buttonm1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { mp.start(); } }); } } And there's nothing wrong in the manifest Heres my logcat: 01-08 16:33:17.647: ERROR/AndroidRuntime(552): Uncaught handler: thread main exiting due to uncaught exception 01-08 16:33:17.676: ERROR/AndroidRuntime(552): android.content.ActivityNotFoundException: Unable to find explicit activity class {com.gunstats/com.gunstats.more}; have you declared this activity in your AndroidManifest.xml? 01-08 16:33:17.676: ERROR/AndroidRuntime(552): at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1480) 01-08 16:33:17.676: ERROR/AndroidRuntime(552): at android.app.Instrumentation.execStartActivity(Instrumentation.java:1454) 01-08 16:33:17.676: ERROR/AndroidRuntime(552): at android.app.Activity.startActivityForResult(Activity.java:2660) 01-08 16:33:17.676: ERROR/AndroidRuntime(552): at android.app.Activity.startActivity(Activity.java:2704) 01-08 16:33:17.676: ERROR/AndroidRuntime(552): at com.gunstats.gunstats$4.onClick(gunstats.java:64) 01-08 16:33:17.676: ERROR/AndroidRuntime(552): at android.view.View.performClick(View.java:2344) 01-08 16:33:17.676: ERROR/AndroidRuntime(552): at android.view.View.onTouchEvent(View.java:4133) 01-08 16:33:17.676: ERROR/AndroidRuntime(552): at android.widget.TextView.onTouchEvent(TextView.java:6504) 01-08 16:33:17.676: ERROR/AndroidRuntime(552): at android.view.View.dispatchTouchEvent(View.java:3672) 01-08 16:33:17.676: ERROR/AndroidRuntime(552): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882) 01-08 16:33:17.676: ERROR/AndroidRuntime(552): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882) 01-08 16:33:17.676: ERROR/AndroidRuntime(552): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882) 01-08 16:33:17.676: ERROR/AndroidRuntime(552): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882) 01-08 16:33:17.676: ERROR/AndroidRuntime(552): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1712) 01-08 16:33:17.676: ERROR/AndroidRuntime(552): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1202) 01-08 16:33:17.676: ERROR/AndroidRuntime(552): at android.app.Activity.dispatchTouchEvent(Activity.java:1987) 01-08 16:33:17.676: ERROR/AndroidRuntime(552): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1696) 01-08 16:33:17.676: ERROR/AndroidRuntime(552): at android.view.ViewRoot.handleMessage(ViewRoot.java:1658) 01-08 16:33:17.676: ERROR/AndroidRuntime(552): at android.os.Handler.dispatchMessage(Handler.java:99) 01-08 16:33:17.676: ERROR/AndroidRuntime(552): at android.os.Looper.loop(Looper.java:123) 01-08 16:33:17.676: ERROR/AndroidRuntime(552): at android.app.ActivityThread.main(ActivityThread.java:4203) 01-08 16:33:17.676: ERROR/AndroidRuntime(552): at java.lang.reflect.Method.invokeNative(Native Method) 01-08 16:33:17.676: ERROR/AndroidRuntime(552): at java.lang.reflect.Method.invoke(Method.java:521) 01-08 16:33:17.676: ERROR/AndroidRuntime(552): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791) 01-08 16:33:17.676: ERROR/AndroidRuntime(552): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549) 01-08 16:33:17.676: ERROR/AndroidRuntime(552): at dalvik.system.NativeStart.main(Native Method) What is causing this force close?

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Data loss between conversion

- by Alex Brooks

Why is it that I loose data between the conversions below even though both types take up the same amount of space? If the conversion was done bitwise, it should be true that x = z unless data is being stripped during the conversion, right? Is there a way to do the two conversions without losing data (i.e. so that x = z)? main.cpp: #include <stdio.h> #include <stdint.h> int main() { double x = 5.5; uint64_t y = static_cast<uint64_t>(x); double z = static_cast<double>(y) // Desire : z = 5.5; printf("Size of double: %lu\nSize of uint64_t: %lu\n", sizeof(double), sizeof(uint64_t)); printf("%f\n%lu\n%f\n", x, y, z); } Results: Size of double: 8 Size of uint64_t: 8 5.500000 5 5.000000

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Strange behavior of DDD debugger in Ubuntu

- by Alex Farber

I installed DDD debugger in Ubuntu and trying to work with it. It looks like DDD UI doesn't work properly with Ubuntu desktop environment. Edit boxes are almost unusable: sometimes they accept keyboard input, most of times input is ignored. Internal resizing panes are not working. Is there some way to get DDD UI working properly? The same behavior is in Ubuntu 9.10 32 bit, and 10.4 64 bit, so this is not Ubuntu version issue.

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How do I check if a given datetime object is "between" two datetimes?

- by alex

my_event = Event.objects.get(id=4) current_time = datetime.datetime.now() How do I do check if my current time is between them? my_event.start_time < current_time < my_event.end_time

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Simplest way to print an array in Java

- by Alex Spurling

What's the simplest way of printing an array of primitives or of objects in Java? Here are some example inputs and outputs: int[] intArray = new int[] {1, 2, 3, 4, 5}; //output: [1, 2, 3, 4, 5] String[] strArray = new String[] {"John", "Mary", "Bob"}; //output: [John, Mary, Bob]

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In SVN, how do I revert ONE file back to a certain revision?

- by alex

Just one file, not the entire directory. Thanks.

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What database field should this be?

- by alex

I have a table called "Event". A column has "duration"--which is...how long that event lasts. What database type should this be? Integer? (in seconds)? In the future, I will do statements such as: If now() > event.duration THEN don't display the event.

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class inheretence of a attribute which is itself a class

- by alex

i have a class which inherets a attribute from a super-class. this attribute is a class itself. class classA(superClass): def func(self,x): if self.attributeB is None: do somthing and in the other class i have class superClass: self.attributB = classB() i get the error AttributeError: class classA has no attribute 'attributeB' when i access the attribute like i showed but if on command line i can see it works, x = classA() x.attributeB is None True so the test works. whats going on in the above code?

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How do I load a sql.gz file to my database? (importing)

- by alex

is this right? mysql -uroot -ppassword mydb > myfile.sql.gz

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Can you make a PHP function recursive without repeating it's name?

- by alex

It's always bugged me a recursive function needs to name itself, when a instantiated class can use $this and a static method can use self etc. Is there a similar way to do this in a recursive function without naming it again (just to cut down on maintenance)? Obviously I could use call_user_func or the __FUNCTION__ constant but I would prefer something less ugly. Update Thanks for your answers. I might stick to including the function name for simple functions, and make take the other approaches for anything more complicated.

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I DISTINCTly hate MySQL (help building a query)

- by Alex Mcp

This is staight forward I believe: I have a table with 30,000 rows. When I SELECT DISTINCT 'location' FROM myTable it returns 21,000 rows, about what I'd expect, but it only returns that one column. What I want is to move those to a new table, but the whole row for each match. My best guess is something like SELECT * from (SELECT DISTINCT 'location' FROM myTable) or something like that, but it says I have a vague syntax error. Is there a good way to grab the rest of each DISTINCT row and move it to a new table all in one go?

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Is there an easy (idiomatic) way to convert a java.lang.reflect.Method to a Scala Function Value?

- by Alex R

Can I retrieve a Method via reflection, somehow combine it with a target object, and pass it around as a first-class Scala function value? The argument list is variable.

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Why can't RB-Tree be a list?

- by Alex

Hey everyone. I have a problem with the rb-trees. according to wikipedia, rb-tree needs to follow the following: A node is either red or black. The root is black. (This rule is used in some definitions and not others. Since the root can always be changed from red to black but not necessarily vice-versa this rule has little effect on analysis.) All leaves are black. Both children of every red node are black. Every simple path from a given node to any of its descendant leaves contains the same number of black nodes. As we know, an rb-tree needs to be balanced and has the height of O(log(n)). But, if we insert an increasing series of numbers (1,2,3,4,5...) and theoretically we will get a tree that will look like a list and will have the height of O(n) with all its nodes black, which doesn't contradict the rb-tree properties mentioned above. So, where am I wrong?? thanks.

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