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Visual C# General

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  - 1
    - difference between dates Hi, I have to calculate the differnece between the current date and a transaction date that comes from database.if the difference between two dates is grater than 90 days i have to perform some actions.How to do this in C# pls help me. Thanks, Tag: Visual C# General Make a thread Visual C#
  - 2
    - Assigning lot's of string into an array after it has been declared Thanks. I'll keep that in mind. I'm not redy for that yet I think, but I'll try to learn with time. Tag: Visual C# General Make a thread Visual C#
  - 3
    - WebCam Capturing Thanks for getting back the problem is that the source code i downloaded from the link is not working , suggest ! zubair Tag: Visual C# General Make a thread Visual C#
  - 4
    - mouse cursor position hello all, how can i get the position of a cursor on a form. using the cursor.position returns the cordinates according to the whole screen 10x Tag: Visual C# General Make a thread Visual C#
  - 5
    - Is this really that hard?? OK, some code to create a timer: Code Snippet System.Windows.Forms. Timer timer = new System.Windows.Forms. Timer (); timer.Interval = 1000 * 60 * 5; timer.Tick += new EventHandler (timer_Tick); timer.Start(); And then create an event handler: Code Snippet static void timer_Tick( object sender, EventArgs e) { // Do whatever } Tag: Visual C# General Make a thread Visual C#
  - 6
    - Convert string to operation Wow you're expert! I guess it takes an amount of infinity^2 time to get to this level of knowledge. :) Thank you for that long piece of code, though I must admit, I get lost hopelessly while interpreting it after the 5th line. :) I hope at least I can implement it into my project. It does what I want it to do in itself so far, I'll see what bugs show up with my stitched-together project. Tag: Visual C# General Make a thread Visual C#
  - 7
    - Operator overload inheritance and casting. Hi ! I am new to C# so I often encounter some rather simple problems but I sometimes don't find a simple solution... Below is my simplified context (a Quaternion that inherits from a Vector4 object). My questions are : - why does the bold code throw an InvalidCastException From what I read, I understood that this parenthesis cast (isn't it called "implicit" cast ) may be used only to "unbox" an object, like the following Unboxing example Quaternion q1 = new Quaternion( 1, 2, 3, 4 ); Vector4 q2 = new Quaternion( 1, 0, 0, 0 ); q1 = ( Quaternion ) q2; // this works nicely So if I answered my own previous question, here is the second : - what would be a nice, clean, quick, ie efficient implementation so that I can perform What I want Quaternion q1 = new Quaternion( 1, 2, 3, 4 ); Quaternion unitQuaternion = q1 * ( 1 / q1.Norm ); I can use define an explicit cast (explicit operator from Vector4 to Quaternion in Vector4 class) but is seems ugly to me. I can also define a Quaternion constructor from a Vector4 object, and in both case use it in a redefinition of operator* in Quaternion class... But damn, a Quaternion IS a Vector4, there must be something nicer than that ! I appreciate any suggestion... THX ! Zitoun ... And here is The context #region Namespace Declarations using System; using System.Collections.Generic; using System.Text; #endregion Namespace Declarations namespace TestExamples { class Program { static void Main( string[] args ) { Quaternion q1 = new Quaternion( 1, 2, 3, 4 ); Quaternion q2 = ( Quaternion ) ( q1 * ( 1 / q1.Norm ) ) ; } } public class Vector4 { #region Fields protected double _w, _x, _y, _z; #endregion Fields #region Constructors public Vector4( double w, double x, double y, double z ) { _w = w; _x = x; _y = y; _z = z; } #endregion Constructors #region Properties public double w { get { return _w; } set { _w = value; } } public double x { get { return _x; } set { _x = value; } } public double y { get { return _y; } set { _y = value; } } public double z { get { return _z; } set { _z = value; } } public double Norm { get { return Math.Sqrt( w * w + x * x + y * y + z * z ); } } #endregion Properties #region Overloaded Operators public static Vector4 operator *( Vector4 v, double scalar ) { return new Vector4( v.w * scalar, v.x * scalar, v.y * scalar, v.z * scalar ); } #endregion Overloaded Operators } public class Quaternion : Vector4 { #region Constructor public Quaternion( double w, double x, double y, double z ) : base( w, x, y, z ) { } #endregion Constructor } } Tag: Visual C# General Make a thread Visual C#
  - 8
    - Problem with Sockets Hi Peter I just tested this: Server: TcpListener tcpl = new TcpListener(IPAddress.Any, 101); public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { tcpl.Start(); tcpl.AcceptTcpClient(); } Client: TcpClient tc = new TcpClient("localhost", 101); bool x = tc.Connected; x became true (no error or something else) Could it be that you have 2 server instances running or that some other application is already running on that specific port (skype always listens at port 80 for example) Tag: Visual C# General Make a thread Visual C#
  - 9
    - readonly question But const cannot be use for run-time instantiation.. That is, you CANNOT do const Foo a = new Foo(); Tag: Visual C# General Make a thread Visual C#
  - 10
    - Passing parameter as byref, readonly Value types (structs) are passed by value and reference types (classes) are passed by reference (i.e. you can't pass a reference type by value). When you add the "ref" or "out" keyword to a parameter you're really saying pass the reference by reference, in the case of classes. "ref" on a value type works as you've described for C++. Tag: Visual C# General Make a thread Visual C#
  - 11
    - couple of questions arraylist Yakyb, as already said in this thread, ArrayLists are more or less obsolete in .NET 2.0. Another interesting feature is the list of generic methods available for Arrays (FindIndex<T>, for instance, which allows you to express complex finds quite easily). Anyway, this is just a suggestion to keep looking at all the tools that .NET makes available. To answer your question: assuming you have a class like: public class Component { public string Type; public string Name; public double Cost; ... } (yes... good practice would be to use private fields and provide public properties to access them. I'm not being sloppy, I'm just trying to keep this short). First, we need a function to locate a component with a given part in an ArrayList. public static Component FindComponentByType (ArrayList list, string type) { foreach (Component c in list) { if (c.Type == type) { return c; } } return null; } (the search is strictly linear. While it is possible to do better, it's not really worth the effort for just 10 elements) Then we need to find the lowest price across several ArrayLists. public static GetLowestPrice (ArrayList [] lists, string type) { Component result = null; foreach (ArrayList list in lists) { Component component = FindComponentByType (list, type); if (component != null) { if ((result == null) || (component.Cost < result.Cost)) { result = component; } } } return result; } Putting it all together: public static void Main (string [] args) { ArrayList part1 = new ArrayList (); ArrayList part2 = new ArrayList (); ArrayList part3 = new ArrayList (); ... fill the lists ArrayList [] lists = new ArrayList [] { part1, part2, part3 }; ArrayList cheapest = new ArrayList (); foreach (Component component in lists [0]) { // choose one of the lists, to get all the parts you need cheapest.Add (GetLowestPrice (lists, component.Type)); } } Definitely a bit messy. But it should work fine as a beginning. HTH --mc Tag: Visual C# General Make a thread Visual C#
  - 12
    - Sorting a listview by the column... How do you enable ListView sorting by clicking on the column headers Tag: Visual C# General Make a thread Visual C#
  - 13
    - how to call windows application through windows services Hai, I am currently doing windows services in this i have to create desktop alerts ,can i use windows application and call into windows services Plz any one help me. Thanks & Regards sai Tag: Visual C# General Make a thread Visual C#
  - 14
    - Certification for C# You can take any one of the below examination. The exam you will chose depend upon your skillset and expertise in Windows or Web or Distributed aplications. Have a look at the below examinations and choose any one of them which is the most suitable for you. (1) http://www.microsoft.com/learning/mcp/mcts/winapps/default.mspx (2) http://www.microsoft.com/learning/mcp/mcts/webapps/default.mspx (3) http://www.microsoft.com/learning/mcp/mcts/distapps/default.mspx Regards, Snehal Tag: Visual C# General Make a thread Visual C#
  - 15
    - Delegate signature doesn't match but can compile? Now that's a completely different scenario. What you're encountering is an overloaded ability of Delegate.CreateDelegate. In .NET 1.1 CreateDelegate only supported static members. In .NET 2.0 CreateDelegate is overloaded to support instance members if the delegate it's asked to create has a first parameter of same type as the instance you want to call it on. The method that the delegate is pointing to must have a signature with all the same parameters, except the first. What's really happening is you're creating a delegate to a hidden delegate and that delegate is calling the hidden delegate like this: hiddenDelegate(argument). Unfortunately, the Delegate class isn't designed well for delegates to instance methods outside of compilers. I'm assuming you're doing this to avoid having to create a delegate for each instance of Employee. It's not clear from you example why you're doing it that way, but you have all the information for "e.ApplyRaiseOf(10m)" instead of using delegates. Tag: Visual C# General Make a thread Visual C#
  - 16
    - user setting hi I need to set up a user config but i am using . net 1.1 so i use xml instate but how can i read & write to the following xml using the xml reader & writer or is there a better way of doing this < xml version="1.0" encoding="utf-8" > <root> <fileDesc>This Xml file contains the user setting </fileDesc> <userData desc="This section contains user define data "> <data name="source" value="C:\sdsa.xls" desc="The location of the source file" /> <data name="dest" value="C:\dsad.xls" desc="The location to save the file" /> <data name="fileName" value="best_" desc="The front name of the file" /> </userData> </root> thank you and best regards andors Tag: Visual C# General Make a thread Visual C#
- Next
  - 1
    - Please Help, Getting and Sorting Data from Strings??? It may not be important to the application killing processes. But, the other processes that are still using it, are still using it. If they encounter a corrupted file, there's not telling what will happen. (i.e. bad things). Tag: Visual C# General Make a thread Visual C#
  - 2
    - Enumerating objects by type For the where clause it isn't as simply as you suggest. In your specific example of the equivalent code your if loop is superfluous. It does nothing when you say: foreach(Ship ship in Ships) If the object returned by the enumerator is not of type Ship or a derived type then an exception will occur. It implicitly does a typecast before doing the assignment. Your if statement doesn't accomplish anything. To make the code equivalent you'd have to do this: foreach(object obj in Ships) { Ship ship = obj as Ship; if (ship != null) { ... }; } So to get the equivalent functionality with a where-type claused you'd have to do this: foreach(object obj in Ships where obj is Ship) { .. } But now obj is Object rather than Ship. I think LINQ will provide a better alternative for this case. However you can get a similar behavior today. You can do something like this: foreach(Ship ship in Ships.Where(delegate { return x is Ship; })) { ... }; It's messier but it should work (after fixing compilation errors). This is effectively how LINQs is implemented. Ultimately the delegate is really a predicate which takes an object and returns true or false. If it returns true then it is returned from the enumerator otherwise it is skipped. Of course calling a method for each object will have a detrimental impact on performance as well. Moving back to your timing. I think you are drawing a few incorrect assumptions from your data. Your data does the enumeration each time but it doesn't take into account the overhead of some operations. In general a generic type should perform the same as a non-generic type. However there is overhead the first time a generic type is used. You need to eliminate this overhead. In your tests I would have expected the non-generic and generic enumerators to perform the same AFTER the generic type is created at least once. Did you run your test through multiple iterations within the same run If not then the initial conversion from the generic type to a concrete type is going to throw off your numbers. I'm not surprised that the yield keyword takes more time. It has to save off the stack frame for later use so it will be slower than a normal iteration. I think you can optimize your concrete/generic enumerator though. Rather than having your enumerator call the underlying list's enumerator just iterate manually. This eliminates a function call or two which will increase performance slightly. All you really need to track inside your enumerator is the current index within the list. Each invocation increments the index, does the check and loops until you run out of items or find a match. As a final note be aware that the Stopwatch class was added to v2 for performance gathering. It uses QPF under the hood. You can use this in lieu of your custom implementation. Michael Taylor - 10/17/07 http://p3net.mvps.org Tag: Visual C# General Make a thread Visual C#
  - 3
    - Windows Service Install and verifying help Dear Henock, I am really sorry I am very new to .net technology in this terms. So I dont know to create an installer and eventlog using the installer. I am using visual studio 2005. I manage to locate the InstallUtil.exe but when I double click it just open and close immediately. So how to go about can you please guide me Thanks. Tag: Visual C# General Make a thread Visual C#
  - 4
    - could not find file--dll Hi , i created a dll and i'm able to add the dll thru add reference. then i created a new instance like the below dllapplication.dllprogram d = new dllapplication.dllprogram(); private void print() { d.display(); ---i'm able to select the method of the new instance. } then i build it got succeeded. but while executing i get error like , could not find file. pleae help me with this. this is the first dll i've ever created. venp-- Tag: Visual C# General Make a thread Visual C#
  - 5
    - Reading text from Java applet Hi, Is it possible to read and process the text from a Java applet If not by just streaming the text or something, then maybe somehow capturing the pixels, and by them converting it to some readable format to C# if it is possible in ANY way, then some learning material on how to do that would be nice Thank you! Tag: Visual C# General Make a thread Visual C#
  - 6
    - STA Threads and Dialogs You could use System.Diagnostics.Process.Start() to spawn a new process for the exe's. Not sure if this will fix your problem or not, but it sounds like it might... Wes http://www.21concepts.com Tag: Visual C# General Make a thread Visual C#
  - 7
    - how to convert from hex to arabic language Mark Benningfield wrote: Hello All. adorer: Well, I don't know, because I don't know what you want your ouput to look like. If you have a hex number of 1234 1234, I would think that it would look just like that in Arabic, since those are Arabic numerals. YES THIS IS ARABIC LANGUAGE CONVERTOR ... LOOK i HAVE MODEFIED THE FUNCTION AND THE OUTPUT IS DIFFERENT NOW BUT ALWAUS IT IS SOMETHING LIKE A SQUARE (YOU KNOW THESE STRANGE CHARS) THIS IS MY MODEFIED ONE ... public string Hex2Arabic( string msg) { long i; string hex=""; string c; string correct=""; hex = msg; if (((hex.Length % 4) != 0)) { MessageBox.Show("hexa to arabic bad length (it is not divided by 4","error"); } while ((hex.Length > 0)) { c = hex.Substring(0, 4); i = Convert.ToInt32(c, 16); correct =(correct+ ( char )i); hex = hex.Substring((hex.Length - (hex.Length - 4))); } return correct; } Tag: Visual C# General Make a thread Visual C#
  - 8
    - Help regarding Deployment Michael - thanks for your continued suggestions. I tried your first idea and there was no difference. Then I tried executing the application itself and it would not start. So for grins I copied the .exe into my c:\ directory and it ran. I then increased the filename length and the last filename which worked correctly was: 123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890.exe Which - if you prepend the c:\ is exactly 127 characters. As soon as I increase the length by 1 additional character the application no longer starts. So, the executable name, including the path, cannot be greater than 127 characters. - Jeff Tag: Visual C# General Make a thread Visual C#
  - 9
    - protected with internal Hi all, I need to understand the use of access modifier"protected internal". One site says that The intuitive meaning of protected internal is "access limited to this program or types derived from the containing class". My first query is that is this permission is granted using "AND" or "OR". Second,if somebody can please provide any example of its usage which can't be implemented by using protected or internal keyword individually,that would be really helpful to me. Cheers Leo Tag: Visual C# General Make a thread Visual C#
  - 10
    - Dynamic access to statics objects From the original question, it appeared the question was how to find a field by name and invoke a property on it. If I misunderstood, here is a non reflection solution. This code sample randomly accesses 3 different datetime fields based on the random number (between 1 and 3) that is genereted. Code Snippet class Program { private static DateTime dateTime1 = DateTime .Now; private static DateTime dateTime2 = DateTime .Now; private static DateTime dateTime3 = DateTime .Now; private static Random random = new Random (); static void Main( string [] args) { int r = random.Next(1, 4); if (r == 1) { // do something with dateTime1 } else if (r == 2) { // do something with dateTime2 } else { System.Diagnostics. Debug .Assert(r == 3); // do something with dateTime3 ... } } } Tag: Visual C# General Make a thread Visual C#
  - 11
    - Settings problem with whitespace Thanks for the answer. I have come up with a workaround, it's just an odd limitation. Colin. Tag: Visual C# General Make a thread Visual C#
  - 12
    - IDE Locks up/Freezes When Editing XML Code Comments Yes, that looks like it is the same issue. I am able to copy and paste into XML Code Comments that contain characters that would otherwise cause Visual Studio to locks up, but that is totally against the grain of what i normally do so I usually lose all changes up to that point. Sometimes VS2005 will recover the changes sometimes it won't. Seems that due to the potential loss of information (code), time, etc. this would be considered a serious bug with a high priority for getting it corrected and released. I write a lot of custom tasks for MSBuild and am constantly putting XML examples of the custom task in the code comments. This issue makes it very difficult to do that though. Oh and you don't have to type within the CDATA node either. If I type a < anywhere in the code comment section VS2005 locks up. Please provide the fix for this issue!! Shane Tag: Visual C# General Make a thread Visual C#
  - 13
    - Significance of @ string path = @ "c:\MyTest.txt" ; Can anybody explain me what is the significanc of '@' in the assignment Tag: Visual C# General Make a thread Visual C#
  - 14
    - Can I intercept windows messages of other applications ... Ah ... process injection. Well that definitely cannot be done in C#. Thanks for your help. Tag: Visual C# General Make a thread Visual C#
  - 15
    - enterprise library exception handling app block i m trying to use enterprise library exception handling app block for net 2.0 in my win app. I ve found a lot examples showing this code: try { // run code } catch(Exception ex) { bool rethrow = ExceptionPolicy.HandleException(ex, "General Policy"); if (rethrow) { throw; } //WHAT HAPPEN WITH THE EXCEPTION IN THIS LINE NOTHINGG //WHAT THE ExceptionPolicy.HandleException MADE WITH THE EXCEPTION //WHAT IF IS THIS PORTION OF CODE IS IN MY DATA ACCESS LAYER,HOW CAN I //SEND THIS EXCEPTION TO MY UI LAYER AND GIVE A CUSTOMIZED MESSAGE TO THE USER } I hope someone can help me whit these questions answering me with code in order to understand. Hope I m clear. Best Regards Joseph Tag: Visual C# General Make a thread Visual C#
  - 16
    - Debugging Question We just recently seperated a large scale application we are working on into two (several actually) solutions. There is a "framework" solution, that is used by all the other application solutions. So we build the framework first, then reference the dll, as opposed to including the framework project in the application solution and referencing that. Of course, when I go to debug, this causes a problem. I can set a breakpoint in the framework solution, but it doesn't fire when I run the application. Is there a way I can instruct the debugger to go ahead and break into the framework code, even though it is not part of the solution I am working on Tag: Visual C# General Make a thread Visual C#

jan1024188_1

Hello,

I have two questions:

1. How to make a thread in C# that will play a sound like DWORD WINAPI threadplaysnd(LPVOID) { PlaySound("audio.wav",NULL,SND_FILENAME | SND_ASYNC | SND_LOOP); return 0;}
CreateThread(0,0,threadplaysnd,0,0,&dwthreadplaysnd);

In Winapi.

2. How to make an application execute like ShellExecute( NULL, "open", "file.exe", NULL, "", SW_SHOW ); in Winapi.

Thanks in advance

Re: Visual C# General Make a thread

jan1024188_1

Ok, Ive managed with sound:

System.Media.SoundPlayer sp = new System.Media.SoundPlayer();
public Form1()
{
InitializeComponent();

sp.SoundLocation = AppDomain.CurrentDomain.BaseDirectory + "\\audio.wav";
sp.Load();
sp.Play();

}

and

private void button1_Click_1(object sender, EventArgs e)
{
sp.Stop();
}

What about executing a file

Re: Visual C# General Make a thread

Bruno_1

About running an application,
Process.Start("file.exe");
To create a thread and run it, you should first specify a method, that will be wraped to a delegate, then passed as a parameter to a thread constructor;
In code:

Code Snippet

public void Main()

{

Thread th = new Thread(playsound);

th.Start();

}

public void playsound()
{
// Here you play the sound
}

Re: Visual C# General Make a thread

jan1024188_1

Thanks but I get a compiler error:

Code Snippet

Error 1 The name 'Process' does not exist in the current context C:\Users\jan\Documents\Visual Studio 2005\Projects\Untitled - The game menu\Untitled - The game menu\Form1.cs 36 13 Untitled - The game menu

Re: Visual C# General Make a thread

Bruno_1

you should include the namespace where Process is located, this should notified in intellisense, however you can do it manually by:
using System.Diagnostics;

Also you can use : System.Diagnostics.Process.Start(...);

Hope this helped

Re: Visual C# General Make a thread

jan1024188_1

work as charm