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• Rendering WPF DrawingGroup to single ImageSource

  - by Xander

  Currently I'm using a System.Windows.Media.DrawingGroup to store some tiled images (ImageDrawing) inside the Children-DrawingCollection property. Well the problem is now, this method gets really slow if you display the entire DrawingGroup in an Image control, because my DrawingGroup can contain hundreds or even thousands of small images it can really mess up the performance. So my first thought was to somehow render a single image from all the small ones inside the DrawingGroup and then only display that image, that would be much faster. But as you might have figured out I haven't found any solution so simply combine several images with WPF Imaging. It would really be great if someone could help with this problem or tell me how i can improve the performance with the DrawingGroup or even use another approach. One last thing, currently I'm using a RenderTargetBitmap to generate a single BitmapSource from the DrawingGroup, this approach isn't really faster, but it makes the scrolling and working on the Image control at least a little smoother.

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• Learning WPF and MVVM - best approach for learning from scratch

  - by bplus

  Hello, I've got about three years c# experience. I'd like to learn some WPF and the MVVM pattern. There are a lot of links to articles on this site but I'm getting a little overwhelmed. Would a sensible approach for a begginer to be forget mvvm for a while and just quickly learn a bit a of WPF, then come back to MVVM? I had a leaf through this book in work today, it doesn't seem to mention MVVM (at least not in the index). I was pretty surprised by this as I thought MVVM was supposed to be the "lingua franca" of WPF? Also I've just started working at a new company and they are using MVVM with WinForms, has anyone come across this before? Can anyone recommend a book that will teach me both WPF and MVVM?

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• How to convert CFDataRef data to UIImage / NSData - Iphone

  - by sagar

  Hello ! every one. I am having a little query regarding CFData in Objective C / iPhone Development. See, Apple documentation has following method for CGPDFStream CGPDFStreamCopyData(<#CGPDFStreamRef stream#>, <#CGPDFDataFormat *format#>) Above method return type is CGDataRef. I have data as stream. Now I wish to convert in image. & For that I think I should follow this way. CGPDFDataFormat t=CGPDFDataFormatJPEG2000; CFDataRef data = CGPDFStreamCopyData (stream, &t); After executing above statements - I have some reference in data variable. Now my Query is - How to convert this CFData to NSData or UIImage ? I have gone through the documentation of apple - But I am failure to find it. Thanks in advance for sharing your knowledge. Sagar

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• How to display custom view in UIActionSheet?

  - by 4thSpace

  I have a UIView with a date picker that I'd like to display in an action sheet. I'm using the following code: -(IBAction) button_click:(id)sender{ //UIActionSheet *sheet = [[UIActionSheet alloc] initWithTitle:@"the title" delegate:nil cancelButtonTitle:@"Cancel" destructiveButtonTitle:@"Destructive" otherButtonTitles:@"other", nil]; UIActionSheet *sheet = [[UIActionSheet alloc] init]; ActionSheetController *actionSheet = [[ActionSheetController alloc] initWithNibName:@"ActionSheetView" bundle:nil]; [sheet addSubview:actionSheet.view]; [sheet showInView:self.view]; } What I get is a little bit of the top part of the new view coming up from the bottom and that's it. If I comment the two middle lines of code and uncomment the top part to display a regular action sheet, it works fine. Any ideas what I might be doing wrong?

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• Running Xcode Applications without installing Xcode

  - by Cawas

  I know nothing about Xcode, except it's a Developer interface from Apple that actually comes on OSX CD and it's used to create iPhone apps as well. I also know it have a Applications folder, filled with little utilities, that are indeed quite useful. I tried grabbing one of them and running, without installing Xcode but it doesn't work. It brings an error and a Problem Report from which I believe the relevant part is this: Dyld Error Message: Library not loaded: @rpath/DevToolsInterface.framework/Versions/A/DevToolsInterface I've tried, of course, locating that "framework", with no success. Well... I guess it's probably possible to install Xcode, get that utility source, if it exists somewhere, and compile for stand-alone. But that goes beyond my point. I just want to know if there's somewhere I can get those utilities and/or make them run without needing to install Xcode at all.

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• Why is it 8 here,understanding buffer overflow

  - by Mask

  void function(int a, int b, int c) { char buffer1[5]; char buffer2[10]; int *ret; ret = buffer1 + 12; (*ret) += 8;//why is it 8?? } void main() { int x; x = 0; function(1,2,3); x = 1; printf("%d\n",x); } The above demo is from here: http://insecure.org/stf/smashstack.html But it's not working here: D:\test>gcc -Wall -Wextra hw.cpp && a.exe hw.cpp: In function `void function(int, int, int)': hw.cpp:6: warning: unused variable 'buffer2' hw.cpp: At global scope: hw.cpp:4: warning: unused parameter 'a' hw.cpp:4: warning: unused parameter 'b' hw.cpp:4: warning: unused parameter 'c' 1 And I don't understand why it's 8 though the author thinks: A little math tells us the distance is 8 bytes.

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• SQL Server 2005 - Syncing development/production databases

  - by hamlin11

  I've got a rather large SQL Server 2005 database that is under constant development. Every so often, I either get a new developer or need to deploy wide-scale schema changes to the production server. My main concern is deploying schema + data updates to developer machines from the "master" development copy. Is there some built-in functionality or tools for publishing schema + data in such a fashion? I'd like it to take as little time as possible. Can it be done from within SSMS? Thanks in advance for your time

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• Which datagrid to use for ASP.NET MVC2 project?

  - by Nick

  Hi, I am developing a commercial MVC2 app that requires a grid that has callback update in some form to support 10,000+ rows. It should also support relatively rich content (icons, multiline descriptions etc). Although it requires the usual paging/scrolling/sorting features it does not need support for grouping. So nothing that special. The commercial grids I looked at were Component Art (http://www.componentart.com/products/aspnetmvc/datagrid/) and Telerik (http://www.telerik.com/products/aspnet-mvc/grid.aspx) which both look pretty good but may be a little OTT for what I need. They are also $800 and $999 respectively (1 developer). I've also looked at jqGrid (http://www.trirand.net/download.aspx) and the grid from MvcContrib. These appear ok but for a commercial app I am concerned that these may be risky options - though could be wrong there. I'd really appreciate any views/exprience on either the above grids or perhaps you can suggest a better option/approach. FYI I am using EF4 and C#. Cheers

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• Populating Tcl Treeview with Sqlite Data

  - by DFM

  Hello: I am building a Tcl application that reads off of a Sqlite Db. Currently, I can enter data into the database using the Tcl frontend. Now, I am trying to figure out how to display the data within the Sqlite Db from the Tcl frontend. After a little bit of research, I found that the treeview widget would work well for my needs. I now have the following code: set z1 [ttk::treeview .c1.t1 -columns {1 2} -show headings] $z1 heading #1 -text "First Name" $z1 heading #2 -text "Last Name" proc Srch {} {global z1 sqlite3 db test.db pack $z1 db close } When the "Srch" procedure is executed (button event), the treeview (z1) appears with the headings First Name and Last Name. Additionally, the Sqlite Db gets connected, then closes. I wanted to add code that would populate the treeview from the Sqlite Db between connecting to the Db and packing the treeview (z1). Does anyone know the correct syntax to populate a Tcl treeview with data from Sqlite? Thank you everyone in advance, DFM

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• How do I surpress maven assembly plugin skipping files that are already added? Or allow overwrite?

  - by gmale

  Hello, For weeks, I've been wrestling with maven, getting it to deploy our project "properly." I'm almost done but I have one stubborn little problem: When I use the maven assembly plugin with the "directory" goal as in mvn assembly:directory I get LOTS of console output like the following: [INFO] tomcat/conf already added, skipping  [INFO] tomcat/conf/Catalina already added, skipping  [INFO] tomcat/conf/Catalina/localhost already added, skipping  [INFO] tomcat/webapps already added, skipping I've written my own assembly descriptor that basically copies several FileSets into various sub-directories within our deploy directory. Messages like the ones above appear whenever a file from one FileSet is being copied to a location in which another FileSet has already created the basic directory structure (and some "default" files that can be overwritten). So, I'm having a hard time figuring out: How do I either 1) Suppress these messages (but only the "already added" messages) or 2) allow for overwrite?

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• Refresh DOM with jquery after AJAX call

  - by Pim

  I'm working on a new project http://www.hotwirerevealed.com which reveals / identifies hotels on hotwire.com. After inputting a state and a destination I have a javascript functions that uses jquery's .post method to post. The post request goes to an php page which outputs html, I se jquery's html method to place the content on the page. like so function post(){ $.post("lookup.php", {action: "find", area: area, stars: stars, amenities: amenities, state: $('#state').val()}, function(data){ $("#details").html(data); }); } I have hyperlinks to hotels which I like to use in a light box <a class="hotel" href="http://google.com/search?btnI=1&amp;q=Amerisuites+Northeast+Orlando+(Airport+MCO)">Amerisuites Northeast</a> im trying to use jquery's fancy box but fancy box $(document).ready(function(){ $(".hotel").fancybox({ 'width' : '75%', 'height' : '75%', 'type' : 'iframe' }); }); but it doesn't seem to work, im guessing because jquery doesn't know the element it there? I've tried to use jquery live() method with little success, any help would be appreciated, thanks ahead of time

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• Jquery JQGrid - How to set alignment of grid header cells?

  - by JK

  Is it possible to align grid column headers in jqgrid? eg align left right or center? In the jqrid documents http://www.trirand.com/jqgridwiki/doku.php?id=wiki:colmodel_options it says: align: Defines the alignment of the cell in the Body layer, not in header cell. Possible values: left, center, right. Note that it says "not in the header cell". How can I do this for the header cell (grid title cell)? The documentation fails to mention this little detail....

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• Missing IUSR account on Windows Server 2008 R2 / IIS7.5

  - by Thomas Wright

  Ok, I'm stumped. I've been given the job of installing PHP5.4 on this machine. One of the manual installation steps is to configure the IUSR account to have specific permissions. The problem is, I see the IIS_IUSRS group, but no IUSR account. The only users listed are the Admin user, a Guest account, and a user for the security software. I'm not really the Windows server type, more of a *NIX guy - so this is getting a little frustrating. I've searched everywhere and haven't found a suitable answer, but I have learned a lot about IIS7.5 - so it hasn't been a total waste of time. I've tried several recommendations and found several similar problems, but nothing has worked so far. I've also just tried making the IUSR account myself, but to no avail. If anyone knows how to get this going, I will be ever so grateful.

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• customizing webmail cpanel login area with php

  - by Coolate

  I have webmail setup similar to what hostgator has (I host with them and looks like they use their own system). I'm trying to customize the login page of webmail, but am a little stuck. When you go to webmail page/port below, you get a popup login form, not a web login form. If you hit cancel, it finally loads the web login form. http://www.hostgator.com/webmail/ Note that I'm using hostgator's webmail link just as an example because they use the same script. Is there a way through php (or any other way) to prevent the popup login form and go straight to the web login form? The next step would be to theme it, etc. etc. Any ideas or tutorials on how this script works?

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• tcpdump on dd-wrt router

  - by Senica Gonzalez

  I'm trying to capture packets from two devices on my network. I have tcpdump installed on my dd-wrt router and working correctly. However, the only packets I capture are broadcast packets when using a tcpdump statement that states only those two devices ./tcpdump -w /tmp/capture.pcap dst 192.168.3.105 or src 192.168.3.105 or dst 192.168.3.136 or src 192.168.3.136 I'm capturing on intefface br0. Is that correct? Both devices are plugged in directly to the ports 1 and 2 with ip addresses 192.168.3.105 and 192.168.3.136 respectively. Do I need to set br0 in promiscuous mode? A little stuck. Thanks.

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• Android Permission Issue android.permission.READ_CONTACTS

  - by jkmcgee

  Hello, All I am trying to do is read a contact off of my emulator and display it to the screen. I can't seem to resolve this error. Both of my packages (com.msi.ibm.tutorial and .MobileServiceCallContacts) have the permission READ_CONTACTS set in their manifest xml files. So any ideas as to what I've got wrong ? Here is the error message from eclipse console if it helps, it's not helping me, but I'm a little rusty at this and completely new to Android development. MobileServiceCallContacts]Starting activity com.msi.ibm.tutorial.MobileServiceCallContacts on device MobileServiceCallContacts]ActivityManager: Starting: Intent { cmp=com.msi.ibm.tutorial/.MobileServiceCallContacts } MobileServiceCallContacts]ActivityManager: java.lang.SecurityException: Permission Denial: starting Intent { flg=0x10000000 cmp=com.msi.ibm.tutorial/.MobileServiceCallContacts } from null (pid=-1, uid=-1) requires android.permission.READ_CONTACTS

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• C# Implementing a custom stream writer-esque class

  - by Luke

  How would I go about writing my own stream manipulator class? Basically what I'm trying to wrap my head around is storing the reference to the underlying stream in the writer. For example, when writing to a memory stream using a StreamWriter, when a Write() is made, the underlying memory stream is written to. Can I store the reference to an underlying stream without using pointers or unsafe code? Even if it was just a string I wanted to "write" to. Really this has little to do with stream writers, and I'm just wondering how I could store references in a class. The StreamWriter was the best example I could come up with for this.

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• Deserializing JSON into an object with Json.NET

  - by hmemcpy

  Hello. I'm playing a little bit with the new StackOverflow API. Unfortunately, my JSON is a bit weak, so I need some help. I'm trying to deserialize this JSON of a User: {"user":{ "user_id": 1, "user_type": "moderator", "creation_date": 1217514151, "display_name": "Jeff Atwood", ... "accept_rate": 100 }} into an object which I've decorated with JsonProperty attributes: [JsonObject(MemberSerialization.OptIn)] public class User { [JsonProperty("user_id", Required = Required.Always)] public virtual long UserId { get; set; } [JsonProperty("display_name", Required = Required.Always)] public virtual string Name { get; set; } ... } I get the following exception: Newtonsoft.Json.JsonSerializationException: Required property 'user_id' not found in JSON. Is this because the JSON object is an array? If so, how can I deserialize it to the one User object? Thanks in advance!

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• Fortran arrays and subroutines (sub arrays)

  - by ccook

  I'm going through a Fortran code, and one bit has me a little puzzled. There is a subroutine, say SUBROUTINE SSUB(X,...) REAL*8 X(0:N1,1:N2,0:N3-1),... ... RETURN END Which is called in another subroutine by: CALL SSUB(W(0,1,0,1),...) where W is a 'working array'. It appears that a specific value from W is passed to the X, however, X is dimensioned as an array. What's going on?

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• C#/.NET: WinForms - "KeyPress" event for textbox is missing?

  - by eibhrum

  Hi, I am trying to add an "KeyPress" event in a textbox (WinForm) this.textBox1.KeyPress += new System.Windows.Forms.KeyPressEventHandler(CheckKeys); and here's inside the 'CheckKeys': private void CheckKeys(object sender, System.Windows.Forms.KeyPressEventArgs e) { if (e.KeyChar == (char)13) { // Enter is pressed - do something } } The idea here is that once a textbox is in focus and the 'Enter' button was pressed, something will happen... However, my machine cannot find the 'KeyPress' event. Is there something wrong with my codes? I need a little help on this one. Thanks.

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• Pass Dictionary of routeValues to ActionLink

  - by Graham

  All, Getting to grips with ASP.NET MVC. So far, so good, but this one is a little nuts. I have a view model that contains a dictionary of attributes for a hyperlink, used like this: menu = model variable Html.ActionLink(Html.Encode(menu.Name), Html.Encode(menu.Action), Html.Encode(menu.Controller), menu.Attributes, null) The problem is the position of "menu.Attributes" expects an object in the form: new { Name = "Fred", Age=24 } From what I can tell, this anonymous object is actually converted to a dictionary via reflection anyway BUT you can't pass a dictionary to it in the first place!!! The Html generated for the link simply shows the dictionary type. How on earth do I get round this? The whole point is that its general and the controller can have set the menu.Attributes previously....

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• Change UIImageView Center - iPhone

  - by CccTrash

  I am trying to make a little ball that rolls around based on the accelerometer values in the iPhone. This code will not build: -(void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration { if(difficulty == @"easy") { CGFloat newX = (CGFloat)(ball.center.x + (CGFloat)acceleration.x); CGFloat newY = (CGFloat)(ball.center.y + (CGFloat)acceleration.y); ball.center.x = newX; ball.center.y = newY; } } It gives me an lvalue required as left operand of assignment error. I've tried 100 different things and I fail every time...This is just the latest failure. Anyone have any insight?

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• Performance implications of Synchronous Sockets vs Asynchronous Sockets

  - by Akash Kava

  We are trying to build an SMTP Server to receive mail notifications from various clients over internet. As each of the communication will be longer and it needs to log everything, doing this Asynchronous way is little challenging as well as by using Socket's Asynchronous methods we are not sure of how flow of control and error handling happens. Previously we wrote lot of server/client apps but we always used Synchronous sockets, reason being they are longer sessions and each session also has lot of local data to manage and parsing messages etc. Does anyone have any experience over real performance differences between these two methods? Async calls use ThreadPool which we have experienced many times to just die for no reason. And we fail to restart threadpool etc. In one way Request-Response protocol of HTTP, Async Sockets makes sense, but SMTP/IMAP etc protocols are longer and they have interleaved messages plus state machine of server. So Async methods are really complicated to program. However if anyone can share the performance of Sockets, it will be helpful.

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• Unexpected resume of "package name" while already resumed in ''package name" Error in Android

  - by Janusz

  If changing the orientation of my phone or the emulator I get the following output in LogCat: 04-09 11:55:26.290: INFO/WindowManager(52): Setting rotation to 1, animFlags=0 04-09 11:55:26.300: INFO/ActivityManager(52): Config changed: { scale=1.0 imsi=310/260 loc=en_US touch=3 keys=2/1/1 nav=3/1 orien=2 layout=18} 04-09 11:55:26.460: INFO/UsageStats(52): Unexpected resume of client while already resumed in client 04-09 11:55:26.579: INFO/SearchPosition(807): Activity is paused 04-09 11:55:26.689: INFO/SearchPosition(807): Activity is resuming SearchPosition is the activity that is displayed. Activity is paused is written in the onPause Method and Activity is resuming in the onResume method of the activity. I googled a little bit for the error message but I don't fully understand the meaning of it. I think it could mean that the old Activity is not properly destroyed after changing the screen orientation. Is this correct? If yes what causes the error? If this is not correct? What is the meaning of this output?

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• Load balancing and sessions

  - by vtortola

  Hi there, What is the better approach for load balancing on web servers? My services run in .NET and Mono, so they could be hosted on IIS or Apache2, and the will have to provide SSL connection. I've read two main approaches, store the state in a common server and use sticky sessions, there is any other else? I've read 3 diffent things about sticky sessions: 1)the load balancing device will know with which server did you start the connection and all the further connections from that host will be routed to the same server. 2)the load balancing devide read a cookie named: JSESSIONID 3)the load balancing devide read a cookie named: ASPSESSIONID I'm a little bit confused, what will happen exactly? As the connections will be SSL there is not a chance for the load balancing devide of read the cookies, so then what? About store the estate in a common server, what solutions do you know? I've read memcache is a good solution but is there any other else? Cheers.

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