Update Shorthand? - C# Discussion Boards

First Prev Next

Re: OO Design for Specifc Problem

KeithF30-Jul-13 22:49

KeithF

30-Jul-13 22:49

Folks,

Question about my design so far, I am wondering if i am going about this the right way?

I have a COM Library created in C#, with COMVisible set to true. This library talks to a 3rd party WebService calling various methods depending on the task at hand. For each Request / Response class exposed by the 3rd party DLL I have a Request / Response Pair (Class and Interface) to Marshal variables specifically for a VC6 application.

Mainly using:

MarshalAs(UnmanagedType.LPStr)]

So with that in my i have added a C# project to the solution to test this code, see test method below:

static void Main(string[] args)
        {
            ICOMReq iReq = new CCOMReq();
            ICOMRsp iRsp = new CCOMRsp();
            Link l = new Link();

            iReq.Date_Time = DateTime.UtcNow;
            iReq.Var2 = "1023758145865";
            
            l.DoMethod1(iReq, out iRsp);

            //Handle COM Response here
        }

The link class looks like so at the moment be but will have all the methods created once the design is correct:

public class Link
    {
        public bool DoMethod1(ICOMReq _COMReq, out ICOMRsp COMRsp)
        {
            Method1 WebServiceMethod = new Method1(new Method1Request(), new Method1Response(), (CCOMReq)_COMReq, new CCOMRsp());
            WebServiceMethod.Process();

            //Just test code at the moment
            COMRsp = null;
            return true;
        }
    }

Each DoMethod(N) that will be in the link class will look the same performing its task with identical code to the other DoMethods. The key differences between the methods is the Param Types Passed in and the Method1 (Method1Request/Method1Response) type will vary depending on the webmethod to be called.

Class Method1 (There will be one of these for every method I need to implement on the WebService) looks like so:

public class Method1 : WebServiceInterfaceBridge<Method1Request, Method1Response, ICOMReq, ICOMRsp>
{
    public Method1(Method1Request WEB_Req, Method1Response WEB_Rsp, CCOMReq COM_Req, ICOMRsp COM_Rsp)
        : base(WEB_Req, WEB_Rsp, CBE_Req, CBE_Rsp)
    {
        WEB_Req.SOME_DATE_TIME = COM_Req.Date_Time;
    }

    public new void Process()
    {
        base.Process();
    }

    public override void LOG()
    {
        Console.WriteLine(this.WebMethod_Request.MEMBER_VAR_HERE);
    }

    //There will be additional methods here in the end as well as a mapping method to convert the WEBMethodResponse to a COMResponse and pass it back to the caller
}

The class (WebServiceInterfaceBridge) that all Method(N) classes will inherit from is shown below:

public abstract class WebServiceInterfaceBridge <T,U,V,W> : WebServiceInterface
    where T : class
    where U : class
    where V : class
    where W : class
{
    protected T WebMethod_Request;
    protected U WebMethod_Response;
    protected V COM_Request;
    protected W COM_Response;

    public WebServiceInterfaceBridge(T tPHSReq, U uPHSRsp, V vCBEReq, W wCBERsp)
    {
        WebMethod_Request = tPHSReq;
        WebMethod_Response = uPHSRsp;
        COM_Request = vCBEReq;
        COM_Response = wCBERsp;
    }

    public abstract void LOG();

    public void CallWebServiceMethod()
    {
        WebMethod_Response = CallWebMethod<T, U>(WebMethod_Request);
    }

    public void Process()
    {
        LOG();
        CallWebServiceMethod();
    }
}

And finally here is the class that actually calls the Web service that the WebServiceBridge Class inherits from:

public class WebServiceInterface
    {
        private ServiceClient WEBSVC = new ServiceClient();

        public U CallWebMethod<T, U>(T tRequest) 
            where T:class 
            where U:class
        {
            if (tRequest.GetType() == typeof(Method2Request))
            {
                Method2Request Req = (Method2Request)(object)tRequest;
                Method2Response Rsp = WEBSVC.Method2(Req);
                return (U)(object)Rsp;
            }
            else if (tRequest.GetType() == typeof(Method1Request))
            {
                Method1Request Req = (Method1Request)(object)tRequest;
                Method1Response Rsp = WEBSVC.Method1(Req);
                return (U)(object)Rsp;
            }
            else
            {
                throw new NullReferenceException();
            }
        }
    }

I have left out my internal classes for marshaling the Req/Rsp's, they are just classes with Member Vars and Get/Set's.

So basically before i carry on with my design I am wondering from an OO point of view if I am approaching this task in the right way or if what I am doing is overkill and could be greatly simplified?

TIA

Microsoft Expression Encoder with IIS Live Smooth Streaming Issue

Member 1003572121-Jul-13 21:46

Member 10035721

21-Jul-13 21:46

Hi All,
I have used this sample as reference How to use a web cam in C# with .NET Framework 4.0 and Microsoft Expression Encoder 4[^]
and managed to modify the files to stream to my IIS . I have no issue streaming towards my own IP address . However , problem arises when i try to stream it to another IP address . It disconnected after few minutes of streaming but strangely at times it works fine(Not most of the time) . Asked at Microsoft Expression Encoder Forum and no one dares to answer me . I hope here are brave programmers here which can help me solve this particular issue . Do request me if you need to take a look at my codes .
Thanks ,
Daniel

Re: Microsoft Expression Encoder with IIS Live Smooth Streaming Issue

Dave Kreskowiak22-Jul-13 1:46

Dave Kreskowiak

22-Jul-13 1:46

What does this have to do with C#?? A dropped connection doesn't have anything to do with your code. Once the connection starts it's up to Encoder and the client to keep it going. Your code has nothing to do with it.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

GetGuiThreadInfo can not get the caret's position

goldli8820-Jul-13 23:12

goldli88

20-Jul-13 23:12

I want to get the caret position with my C# application.but in some cases ,GetGuiThreadInfo does not work creectly.

it works well on

1. notepad
2. ie
3. explorer
4. word

and works bad on (hwndCaret will be 0)

1. Visual Studio
2. Firefox
3. Sublime Text 2

Anyone who can helps me?

public partial class Form1 : Form
        {
    
            [DllImport("user32.dll")]
            public static extern IntPtr GetForegroundWindow();
    
            [DllImport("user32.dll", CharSet = CharSet.Auto)]
            public static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);
            
            [DllImport("user32.dll")]
            static extern uint GetWindowThreadProcessId(IntPtr hWnd, IntPtr ProcessId);
    
            [DllImport("user32.dll")]
            static extern bool GetGUIThreadInfo(uint idThread, ref GUITHREADINFO lpgui);
    
    
            [StructLayout(LayoutKind.Sequential)]
            public struct GUITHREADINFO
            {
                public int cbSize;
                public int flags;
                public IntPtr hwndActive;
                public IntPtr hwndFocus;
                public IntPtr hwndCapture;
                public IntPtr hwndMenuOwner;
                public IntPtr hwndMoveSize;
                public IntPtr hwndCaret;
                public Rectangle rectCaret;
            }
    
            public  GUITHREADINFO? GetGuiThreadInfo(IntPtr hwnd)
            {
                if (hwnd != IntPtr.Zero)
                {
                    uint threadId = GetWindowThreadProcessId(hwnd, IntPtr.Zero);
    
                    GUITHREADINFO guiThreadInfo = new GUITHREADINFO();
                    guiThreadInfo.cbSize = Marshal.SizeOf(guiThreadInfo);
    
                    if (GetGUIThreadInfo(threadId, ref guiThreadInfo) == false)
                        return null;
                    return guiThreadInfo;
                }
                return null;
            }
    
            public void SendText(string text)
            {
                IntPtr hwnd = GetForegroundWindow();
                if (String.IsNullOrEmpty(text))
                    return;
                GUITHREADINFO? guiInfo = GetGuiThreadInfo(hwnd);
                AddMessage("go");
                if (guiInfo != null)
                {
                    IntPtr ptr = (IntPtr)guiInfo.Value.hwndCaret;
                    AddMessage("hwndCaret = " + ptr.ToInt32());
                    if (ptr != IntPtr.Zero)
                    {
                        AddMessage("Left = " + guiInfo.Value.rectCaret.Left);
                        for (int i = 0; i < text.Length; i++)
                        {
                            SendMessage(ptr, 0x102, (IntPtr)(int)text[i], IntPtr.Zero);
                        }
                    }
                }
            }
    
            public Form1()
            {
                InitializeComponent();
            }
    
            private void AddMessage(string message)
            {
                var i = listBox1.Items.Add(message);
                listBox1.SelectedIndex = i;
            }
    
            private void button1_Click(object sender, EventArgs e)
            {
                Thread.Sleep(2000);
                //textBox1.Focus();
                SendText("Abcdefg");
                AddMessage("------------");
            }
        }

How to Create Dynamic Buttons With Students Roll No. on It From Database

jackspero1820-Jul-13 1:38

jackspero18

20-Jul-13 1:38

hey Friends....

I have a Table with Name (Student_Table)
fields(Stdid, StdRollNo, StuName)
with 5 records

And A windows Form With Name Form1

Now, My question is..
I want Dynamic Buttons equals to students records ie.. 5 buttons,
on That Buttons i want Student Roll No.

please guys help me

Jack_Spero

Re: How to Create Dynamic Buttons With Students Roll No. on It From Database

Garth J Lancaster20-Jul-13 2:05

Garth J Lancaster

20-Jul-13 2:05

your question has been answered in the other forum you asked it in - a friendly bit of advice - please dont cross post - pick the best forum, post the question once !

'g'

C# unmanage DLL export

hijeenu19-Jul-13 10:32

hijeenu

19-Jul-13 10:32

Hello
I have been trying to export a string array from my C# unmanged DLL export to metatrader , but can not do that , please need you expert suggestion ..

[DllExport("_CheckStringArray", CallingConvention = CallingConvention.StdCall)]
        public static void _CheckStringArray([In, Out, MarshalAs(UnmanagedType.LPStr)]              StringBuilder []  str)
        {
         try
            {
                str[0].Append("hello");
            }
            catch (Exception e)
            {
                MessageBox.Show(e.ToString());
            }
        }

#import "CyboMySqlRead.dll"
   void  _CheckStringArray(string  s[]);

   //-- import end

   string array [3] ;

   //-- calling dll method , should update first index with "hello"
    _CheckStringArray(array)

   Print(array[0]);  // nothing is printed here...

Update Shorthand?

eddieangel19-Jul-13 8:37

eddieangel

19-Jul-13 8:37

Is there a shorthand for updating an object? Something like an initializer?

var item = new FooViewModel { id = "test", name = "test" };

Something like that but instead:

Record myRecord = Context.RecordRepository.GetById(1234);

myRecord {
id = 123,
name = "blah"
}

Cheers, --EA

Re: Update Shorthand?

Dave Kreskowiak19-Jul-13 9:50

Dave Kreskowiak

19-Jul-13 9:50

No, there isn't.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

Re: Update Shorthand?

Abhinav S19-Jul-13 18:48

Abhinav S

19-Jul-13 18:48

The best you can do is try and using LINQ to fetch and update records in the same line.

However, what you are tyring to do is not directly possible.

Apps - Color Analyzer | Arctic | XKCD | Sound Meter | Speed Dial

Re: Update Shorthand?

Jean A Brandelero22-Jul-13 3:59

Jean A Brandelero

22-Jul-13 3:59

In VB.net its called "WITH"
C# dont have this trick... But, you can use this:

/// <summary>
/// C# implementation of Visual Basics With statement
/// </summary>
public static void With<T>(this T _object, Action<T> _action)
{
    _action(_object);
}

Usage:

LongInstanceOfPersonVariableName.With(x => {
     x.AgeIntVar = 21;
     x.NameStrVar = "John";
     x.NameStrVar += " Smith";
     //etc..
});

from http://stackoverflow.com/a/5964848[^]
I dont think its the best solution... But... It may work.

modified 24-Jul-13 7:36am.

Calling VB 6 OCX from C# EXE

matinon2219-Jul-13 2:18

matinon22

19-Jul-13 2:18

I have C# MDI Form EXE as a framework. In which I have to deployed my VB 6 OCX, and also calls another VB 6 OCX from displayed OCX events.

Is this possbile? where I have to make changes C# or VB 6.0?
Does anyone has made similar kind of project before?

Any link?

Thanks in Advance

Re: Calling VB 6 OCX from C# EXE

Dave Kreskowiak19-Jul-13 2:21

Dave Kreskowiak

19-Jul-13 2:21

It's just a COM component. You just add a reference to it and use it like any other class.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

Re: Calling VB 6 OCX from C# EXE

matinon2223-Jul-13 22:18

matinon22

23-Jul-13 22:18

Thanks Dave,

fisrt COM component loaded fine in C#.net exe framework. My problem is to load another COM component into same C#.net exe framework, and this second COM component will be called from first COM component.

Hope you understand my problem.

Any idea?

Re: Calling VB 6 OCX from C# EXE

Dave Kreskowiak24-Jul-13 3:52

Dave Kreskowiak

24-Jul-13 3:52

Exactly the same as before. You add a reference to it.

You're problem is that your COM componets should not be calling into each other. That would be a hard-code tie where you couldn't use one component without the other. That's just a bad design.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

Generic collections

PozzaVecia19-Jul-13 0:09

PozzaVecia

19-Jul-13 0:09

I need to use a generic collection of keyvalue pair. I need thr folloeing:

1) should be generic because my values are a customized class
2) iterating should keep the order in which I added Items
3) I should be able to find the index of the element
4) I need access via Key

A dictionary is ok for 1,2,4 but not for 3
SortedList and SortedDictionary are ok for 1, 3, 4 but not for 2.
If I create a

List<keyvaluepair>

it is ok for 1,2,3 but not for 4 ( I mean not directly)

//Dictionary<string, double> d = new Dictionary<string, double>();
SortedList<string, double> d = new SortedList<string, double>();
            d.Add("z", 1);
            d.Add("a", 2);
            d.Add("c", 3);
            d.Add("b", 4);

            foreach (KeyValuePair<string,double> k in d)
            {
                Console.WriteLine(k.Key + " " + k.Value);
            }

// output: a 2  b 4 c 3 z 1
// but i need to preserve the order in whicth I added.
// I need output: z 1 a 2 c 3 b 4
// using Dictionary I preserve the order but how can select item using an index?

KeyValuePair<string, double> i_item = d.ElementAt(2); // if d is a Dictionary it is not possible

Any suggestion?
Thanks for your time

Re: Generic collections

Nicholas Marty19-Jul-13 0:41

Nicholas Marty

19-Jul-13 0:41

If I change your code to use a Dictionary it works for me... Confused | :confused:

If you directly want to access a value you can also do this:

var value = d["c"];

whil returns the value 3 in this case.

What error do you get when using the Dictionary class?

Re: Generic collections

PozzaVecia19-Jul-13 1:12

PozzaVecia

19-Jul-13 1:12

KeyValuePair<string, double> i_item = d.ElementAt(2); // if d is a Dictionary it is not possible

may be I was not clear I can't get item from index value. For example I need the second element How can I ask the Dictionary the second element?
The dictionary is an unsorted collection

Re: Generic collections

Nicholas Marty19-Jul-13 1:17

Nicholas Marty

19-Jul-13 1:17

An unsorted collection is what you're looking for if you want to prevent the order in which the items were added.

And I don't know what error you're getting when calling

KeyValuePair<string, double> i_item = d.ElementAt(2);

as this works just fine for me with a dictionary

Re: Generic collections

PozzaVecia19-Jul-13 1:26

PozzaVecia

19-Jul-13 1:26

thanks you are right sorry. Basically I need to find the index from the key and viceversa.

How can I find the index related to the key "3", from the dictionary. It should be 2

Re: Generic collections

Nicholas Marty19-Jul-13 2:07

Nicholas Marty

19-Jul-13 2:07

Why do you need to be able to get the index of a KeyValuePair if you already got the key? Confused | :confused:

Maybe take a look at the hint from Keith.

Note: As I just saw after a bit of researching, the Dictionary uses some hashing of the keys to create some order which means it does not necessarily return the items in the order in which they were added

Source: http://msdn.microsoft.com/en-us/library/xfhwa508.aspx[^]

Quote:
For purposes of enumeration, each item in the dictionary is treated as a KeyValuePair<tkey, tvalue=""> structure representing a value and its key. The order in which the items are returned is undefined.

Re: Generic collections

Keith Barrow19-Jul-13 1:04

Keith Barrow

19-Jul-13 1:04