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• Why isn't an exception thrown when the right .NET framework version is not present?

  - by Nate Heinrich

  We have a .NET application which targets .NET 3.5. Our clients run it from a shared drive (very infrequently) in order to have a central config file location. We have noticed that if a workstation accesses the shared drive and runs the program, but does not have .NET 3.5 installed, nothing happens, no error, no exception, no log entry, it just doesn't launch. Why is there no error message shown in windows by the CLR? Is there something I can put at the beginning of the code that would ensure that a proper error message is displayed? It is not an option to run an installer that would check for prereqs, as we are only installing it in one central location. Thanks.

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• Win32 api call via C# fails!

  - by user434186

  Hi. I have a C++ function exported as api like this: #define WIN322_API __declspec(dllexport) WIN322_API char* Test(LPSTR str); WIN322_API char* Test(LPSTR str) { return "hello"; } the function is exported as API correctly by the .DEF file, cause i can see it in Dependency Walker tool. Now i have a C# tester program: [DllImport("c:\\win322.dll")] public static extern string Test([MarshalAs(UnmanagedType.LPStr)] String str); private void Form1_Load(object sender, EventArgs e) { string _str = "0221"; Test(_str); // runtime error here! } on calling the Test() method i get the error: "A call to PInvoke function 'MyClient!MyClient.Form1::Test' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature." i tried many other data types and marshalings, but got nothing! plz help me!

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• Unsuccessful error detection of improperly declared method in GCC 4.2 compiler

  - by sam

  I am using C++ compiler GCC 4.2 in XCode 3.2.2. I have noted that the compiler will successfully compile a method foo even though there are no ellipses. The header and method are properly declared as foo(), but when I do a find and replace either by file or by program-wide it will miss approximately 2-3% of the changes [foo to foo(). This would not be critical if the compiler did not give an erroneous successful build. I have not found that this to occur with: foo(any parameter). Does anyone have any solution? Thank you.

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• Good programming style when handling multiple objects

  - by Glitch

  I've been programming a software version of a board game. Thus far I have written the classes which will correspond to physical objects on the game board. I'm well into writing the program logic, however I've found that many of the logic classes require access to the same objects. At first I was passing the appropriate objects to methods as they were called, but this was getting very tedious, particularly when the methods required many objects to perform their tasks. To solve this, I created a class which initialises and stores all the objects I need. This allows me to access an object from any class by calling Assets.dice(), for example. But now that I've thought about it, this doesn't seem right. This is why I'm here, I fear that I've created some sort of god class. Is this fear unfounded, or have I created a recipe for disaster?

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• Unable to install Maven: "JAVA_HOME is set to an invalid directory"

  - by hello_world_infinity

  I followed the Maven tutorial to the letter but I still can't get Maven installed. When I run the following in command prompt: E:\Documents and Settings\zach>mvn --version I get: 'mvn' is not recognized as an internal or external command, operable program or batch file. I navigated to the maven install folder and ran mvn --version and got: E:\java resources\apache-maven-2.2.0\bin>mvn --version ERROR: JAVA_HOME is set to an invalid directory. JAVA_HOME = "E:\Sun\SDK\jdk\bin" Please set the JAVA_HOME variable in your environment to match the location of your Java installation but when I run java -version I get: java version "1.6.0_14" Java(TM) SE Runtime Environment (build 1.6.0_14-b08) Java HotSpot(TM) Client VM (build 14.0-b16, mixed mode) So I do have Java installed. Anyone know what the problem is?

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• Are there any modern platforms with non-IEEE C/C++ float formats?

  - by Patrick Niedzielski

  Hi all, I am writing a video game, Humm and Strumm, which requires a network component in its game engine. I can deal with differences in endianness easily, but I have hit a wall in attempting to deal with possible float memory formats. I know that modern computers have all a standard integer format, but I have heard that they may not all use the IEEE standard for floating-point integers. Is this true? While certainly I could just output it as a character string into each packet, I would still have to convert to a "well-known format" of each client, regardless of the platform. The standard printf() and atod() would be inadequate. Please note, because this game is a Free/Open Source Software program that will run on GNU/Linux, *BSD, and Microsoft Windows, I cannot use any proprietary solutions, nor any single-platform solutions. Cheers, Patrick

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• Using Vim on the ipad... Any tips?

  - by pax1728

  I'm itching to program on my ipad. With the iSSH app I was able to log on to my university's server and even open an X server window. Unfortunately, the experience within iSSH is still rather clumsy. When using vim, the bottom line is hidden by the keyboard. Does anyone have any experience with SSH connections and the ipad or iphone? Are there better applications to use? I would prefer not to jailbreak my ipad.

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• Exit Tks mainloop in Python?

  - by Olof

  I'm writing a slideshow program with Tkinter, but I don't know how to go to the next image without binding a key. import os, sys import Tkinter import Image, ImageTk import time root = Tkinter.Tk() w, h = root.winfo_screenwidth(), root.winfo_screenheight() root.overrideredirect(1) root.geometry("%dx%d+0+0" % (w, h)) root.focus_set() root.bind("<Escape>", lambda e: e.widget.quit()) image_path = os.path.join(os.getcwd(), 'images/') dirlist = os.listdir(image_path) for f in dirlist: try: image = Image.open(image_path+f) tkpi = ImageTk.PhotoImage(image) label_image = Tkinter.Label(root, image=tkpi) # ? label_image.place(x=0,y=0,width=w,height=h) root.mainloop(0) except IOError: pass root.destroy() I would like to add a time.sleep(10) "instead" of the root.mainloop(0) so that it would go to the next image after 10s. Now it changes when I press ESC. How can I have a timer there?

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• Using java to send/receive different objects through UDP

  - by AAA

  Hello everyone, I am writing a program in Java where there are communications between two or more machines using UDP. My application sends objects after serializing them through the network to the other machine where it will be deserialized and dealt with it. I was successful in sending one kind of objects so far. My problem is that I want the sender to be able to send different kind of objects, and for the receiver to be able to receive them and cast them again to their appropriate types. However, since UDP allocates a byte buffer then receive the data into the buffer, it is impossible to cast or detect the type of the received object as different objects have different sizes. Is there is a way that I can use to send different kind of objects using UDP and then receive them at the other end? (I don't ask for code here, just some ideas) Thanks

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• How Can I Automatically Execute A Link In Internet Explorer

  - by Martin

  I am trying to create an application to print documents over the web. I have created my document, and made a web page with a meta refresh tag, along the lines of this: <meta http-equiv="refresh" content="3;http://example.com/download.epl2" /> I specify that the document has a content-type of application/x-epl2, and I have associated .epl2 files on my computer with a program that silently sends them to the printer. I have put the website into my trusted sites zone. Currently Internet Explorer pops up the "Open, Save, Cancel" dialog box with no option to automatically open the file. Is there a setting in IE6/7/8 that I can use to have IE just open the file without prompting?

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• Guaranteed COM object release?

  - by Jurily

  I wrote the following code under the assumption that Excel will die with Monkey: class ExcelMonkey { private static Excel.Application xl = new Excel.Application(); public static bool parse(string filename) { if (filename.Contains("foo")) { var workbook = xl.Workbooks.Open(filename); var sheet = workbook.Worksheets.get_Item(1); // do stuff return true; } return false; } } How do I make sure it does? Do I need to release workbook and sheet separately? I want to have Excel around for the lifetime of the program, it's a huge performance improvement.

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• Undefined Variable in Matlab

  - by OrangeRind

  The Following is the basic skeleton for my MATLAB program. Each box is a class definition. Scroll down for the error. Note: Each Class has a custom constructor which does not require an external parameter The Error Undefined function or variable 'Troom'. Error in == wallwall.wall at 31 function o = wall(Tr) Error in == mainfile at 5 w1 = wall(); This comes when I create an object of Class wall from another file "mainfile" Question Why is this happening? Am I getting wrong in the concepts of OOP for Matlab specific? How do I resolve this? Thanks in Advance!

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• How to assign permissions for Copy/Paste on windows

  - by jalchr

  Well, as everyone knows there is no way you can assign permissions for Copy/Paste of files on windows platform. I need to control the copy process from a central file server, in a way that helps me know: which user performed the copy Which files were copied where did he pasted them Total size of data copied Time of copy operation If user exceeds the allowed "Copy-Limit", a dialog box requests him to enter administrative credentials or deny him (as it would be configured) Store all this data in a file for later review or send by email. I need to collect this data by putting a utility program on the server itself, without any other installation on client computers. I know about monitoring the Clipboard, but which clipboard would it be? the user's clipboard or the server's clipboard ? And what about drag-drop operation, which doesn't even pass through the clipboard? Any knowledge of whether SystemFileWatcher is useful in such case ? Any ideas ?

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• JavaFX Threading issue - GUI freezing while method call ran.

  - by David Meadows

  Hi everyone, I hoped someone might be able to help as I'm a little stumped. I have a javafx class which runs a user interface, which includes a button to read some text out loud. When you press it, it invokes a Java object which uses the FreeTTS java speech synth to read out loud a String, which all works fine. The problem is, when the speech is being read out, the program stops completely until its completed. I'm not an expert on threaded applications, but I understand that usually if I extend the Thread class, and provided my implementation of the speech synth code inside an overridden run method, when I call start on the class it "should" create a new Thread, and run this code there, allowing the main thread which has the JavaFX GUI on to continue as normal. Any idea why this isn't the case? Thanks a lot in advance!

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• Why its not working?

  - by Andrew Hoffmann

  BinaryReader br = new BinaryReader(Console.OpenStandardInput()); BinaryWriter bw = new BinaryWriter(Console.OpenStandardOutput()); int n = br.ReadInt32(); bw.Write(n); always getting this error: Unhandled Exception: System.IO.EndOfStreamException: Failed to read past end of stream. at System.IO.BinaryReader.FillBuffer (Int32 numBytes) [0x00000] in <filename unknown>:0 at System.IO.BinaryReader.ReadInt32 () [0x00000] in <filename unknown>:0 at Program.Main () [0x00025] in /home/skydos/ACM/Csharp/Csharp/Main.cs:24 Is there any way to make reading data in C# faster from Console?

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• CFLAGS vs CPPFLAGS

  - by EB

  I understand that CFLAGS (or CXXFLAGS for C++) are for the compiler, whereas CPPFLAGS is used by the preprocessor. But I still don't understand the difference. I need to specify an include path for a header file that is included with #include -- because #include is a preprocessor directive, is the preprocessor (CPPFLAGS) the only thing I care about? Under what circumstances do I need to give the compiler an extra include path? In general, if the preprocessor finds and includes needed header files, why does it ever need to be told about extra include directories? What use is CFLAGS at all? (In my case, I actually found that BOTH of these allow me to compile my program, which adds to the confusion... I can use CFLAGS OR CPPFLAGS to accomplish my goal (in autoconf context at least). What gives?)

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• Any way to use a class extension method to support an interface method in C#?

  - by dudeNumber4

  Console app below compiles, but the interface cast fails at run time. Is there an easy way to make this work? namespace ConsoleApplication1 { class Monkey { public string Shock { get { return "Monkey has been shocked."; } } } static class MonkeyExtensionToSupportIWombat { public static string ShockTheMonkey( this Monkey m ) { return m.Shock; } } interface IWombat { string ShockTheMonkey(); } class Program { static void Main( string[] args ) { var monkey = new Monkey(); Console.WriteLine( "Shock the monkey without the interface: {0}", monkey.Shock ); IWombat wombat = monkey as IWombat; Console.WriteLine( "Shock the monkey with the interface: {0}", wombat.ShockTheMonkey() ); Console.ReadLine(); } } }

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• Using NSURLRequest+NSURLConnection seems overkill for a webcall with no data return

  - by Spectravideo328

  All, This might seems very straightforward but I have already gone through the URL loading system program guide and the various NSURL.... classes and not found my answer. I am just trying to do a simple call from the app to a website to reserve a party spot: NSString *path=[NSString stringWithFormat:@"http://www.myparty123.com/ireservedURL.asp?Nickname=%@&Seat=%i&Email=%@&Currentparty=%i",john,5432,[email protected],6598]; NSURL* reservationURL =[NSURL URLWithString:path]; NSData *call= [NSData dataWithContentsOfURL:reservationURL]; This seemed to be the simple way but I get this warning that I am not using the "call" variable. And it seems overkill to do a call using NSData where there is no data return. Yet, creating an NSURLRequest and initiating an NSURLConnection and then implementing delegates with that request seems to be overkill as well. What am I missing. Thanks KMB

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• Any simple Java way to pass parts of a hashmap to another hashmap?

  - by Arvanem

  Hi folks, For my trading program, a Merchant object has a qualities HashMap of enumerated Qualities with Boolean values. public class Merchants { private Map<Qualities, Boolean> qualities = new HashMap<Qualities, Boolean>(); I would like to give each Merchant object a further ratedQualities HashMap of True Qualities with Byte or Integer values representing the Rating of those Qualities. For example, a given Merchant could have a "1" Rating associated with their True Stockbroking Quality. The problem is Java does not let me do this easily. The following code demonstrates my intentions but doesn't compile: private Map<qualities-TRUE, Byte> ratedQualities = new HashMap<qualities-TRUE, Byte>(); According to this link text one solution is to create a Wrapper for the qualities HashMap. Is this the only solution or is there a better way? Thanks in advance for your help.

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• Getting py2exe to work

  - by Richard

  Hello all. I am following the the tutorial at http://www.py2exe.org/index.cgi/Tutorial to figure out how to use py2exe. I get down to step 3 where you are suppose to run the command: python setup.py py2exe I do that and then I get this error: 'python' is not recognized as an internal or external command, operable program or batch file. I have python 2.4 installed on my machine. any idea's? I am sure it is something simple.

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• Visual Studio 2010 SQL Server Database Project - Ignore Stored Procedures and Functions

  - by Carter

  I really like the new SQL Server Database projects in Visual Studio 2010. I also like using the "Generate DROP statements for objects that are in the target database but that are not in the database project" option in the deployment properties. However, I do not want to manage Stored Procedures and Functions using this interface; I have another tool for that. Every time I do a build and deploy, VS will drop my stored procedures that I have created with my external program. I would like to essentially "ignore" stored procedures and functions. Is there a way to ignore stored procedures and functions when building SQL Server Database projects? I won't be able to use the "Generate DROP statements..." option if I want to use my external tool for stored procedures and functions.

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• Arithmetic operator confusion

  - by Dusk

  Why I'm getting two different values while using the arithmetic operators for the same value of variables. I've just altered little bit my second program, which is resulted in giving me the different output. Could anyone please tell me why? int number=113; int rot=0; rot=number%10; rot*=100+number/10; System.out.println(rot);//333 int number=113; int rot=0; rot=number%10; rot=rot*100+number/10; System.out.println(rot);//311

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• Root view controllers and modal dialogs

  - by Tony

  In a custom UIViewController, if I have a member UINavigationController that I initialize with self as the root view, like this: navController = [[UINavigationController alloc] initWithRootViewController:self]; then presenting a modal dialog does not hide the tab bar at the bottom of the screen. The result is that if the user switches to a different tab while a modal dialog is displayed, when they pop back to the tab that was displaying a modal dialog then subsequent calls to presentModalViewController do not display a modal dialog at all, even if I call dismissModalViewControllerAnimated as a result of the tab switch. If I initialize the UINavigationController with out setting self as the root controller, navigationController = [[UINavigationController alloc] init]; then the tab bar is hidden as expected. I've changed things in my program so that this isn't really an issue for me anymore, but I'm not sure that I understand why this is happening. Is it considered bad practice to have a navigation controller with self as the root, if the nav controller is going to be displaying modal dialogs?

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• How do i get a more recent version of Java on my Mac than is showing up in software update?

  - by Bec

  I need at least Java 1.6 to run a program that someone else in my lab wrote On the Java website it tells me to update Java via apple's software update function, i've run this a few times but it only got up to Java 1.5.0_24 and it now says no more updates are available for my computer Is there another way to update Java on a Mac? Is my operating system maybe to old for Java 1.6? i'm not sure what i'm running exactly, and i can't find a list of what mac operating systems run what versions of Java because the java site just suggests using Mac's software update.

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• Need alternative field names for these reserved words

  - by MattSlay

  “type” and “class” are likely reserved or problematic words in C# and/or Ruby, two languages I may use to program against my new database schema in the future. So, in order to avoid potential conflicts with those languages, I’m looking for alternative names for these field names in my tables. In this case, it is from my Machines table, where I have: “class” field (values would be something like “manual” or “computerized”) and “type” field (values would be “lathe” or “mill”) I could call the fields “machineclass” and “machinetype”, but that is inconsistent with naming scheme in the rest of my schema (meaning, I do not re-use the table name in the field… For instance, I use Machine.name, not Machine.machinename) Any thought on this madness?

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