microsoft.public.dotnet.languages.csharp Latest Posts

Connect to databace error (Login and Register)

Mon, 8 Feb 2010 21:04:33 -0500

Does any one know how to fix this error?
Validation of viewstate MAC failed. If this application is hosted by a
Web Farm or cluster, ensure that configuration specifies the
same validationKey and validation algorithm. AutoGenerate cannot be used in
a cluster.

Thanks
Nick

Re: C# Keyboard Hook Problems

Tue, 9 Feb 2010 02:05:07 +0100

Hi Daniel,

thats what a valid call looks like:

SetWindowsHookEx(WH_KEYBOARD_LL,
LowLevelKeyboardHookProc,
Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]),
0);

CallingConvention = CallingConvention.StdCall is not needed and set CharSet
to CharSet.Unicode if you strictly run on windows NT systems.

The callback delegate should look like that:

private delegate IntPtr LowLevelKeyboardProcDelegate(int nCode, int wParam,
IntPtr lParam);

Then it works fine,...

Regards

Kerem

--
-----------------------
Beste Gr|sse / Best regards / Votre bien devoue
Kerem G|mr|kc|
Latest Project: http://www.pro-it-education.de/software/deviceremover
Latest Open-Source Projects: http://entwicklung.junetz.de
-----------------------

"dsheiner" schrieb im Newsbeitrag
news:afd73d37-a909-42f0-8072-e4febb41b44e@o16g2000vbf.googlegroups.com...
> Hi,
>
> I'm trying to implement a keyboard hook that will receive all keyboard
> events within my application, and only my application, using C# .NET
> 3.5 and VS 2008.
>
> I'm using the following code:
>
> private delegate IntPtr KeyboardHookCallback(int nCode, IntPtr wParam,
> IntPtr lParam);
>
> private static KeyboardHookCallback _callback = new
> KeyboardHookCallback(HookCallback);
> private const int WH_KEYBOARD_LL = 13;
>
> private static IntPtr SetHook()
> {
> return SetWindowsHookEx(WH_KEYBOARD_LL, _callback, IntPtr.Zero,
> Thread.CurrentThread.ManagedThreadId);
> }
>
> [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true,
> CallingConvention = CallingConvention.StdCall)]
> private static extern IntPtr SetWindowsHookEx(int idHook,
> KeyboardHookCallback lpfn, IntPtr hMod, int threadId);
>
> SetWindowsHookEx is returning 0, and Marshal.GetLastWin32Error() is
> returning 87. I understand this means there's an invalid parameter,
> but that's as far as I can get. I've tried using WH_KEYBOARD (2)
> instead of WH_KEYBOARD_LL, and I've tried the deprecated
> AppDomain.GetCurrentThreadId(), but this doesn't seem to make a
> difference. Any idea where I've gone wrong?
>
> Thanks,
> Daniel Sheiner

try debugging design-time

Matthew Phillips — Mon, 08 Feb 2010 16:39:02 -0800

I recently ran into an issue where a designer exploded (thanks VS) and i had a need to debug the designer in order to find where the exception was arising. Here is a great article that explains how to debug visual studio at design time. It's actually rather simple. Perhaps this can help.

http://www.codeproject.com/KB/cs/wsod.aspx

Peter Duniho wrote:

Jeff Gaines wrote:I agree.
04-Feb-10

Jeff Gaines wrote: I agree. It sounds like you really do have a composite control, which is exactly the use case UserControl is intended for. Right?for designing purposes, the Designer needs to create the base version, and then it layers its own stuff on top. it is not actually manipulating an instance of the type being designed, so it is okay for that type to not be instantiable. It seems to me that as long as you do not find yourself in a situation where you _do_ need to design using the abstract type ? for example, you want to be able to further do design work on the derived types ? that it being abstract should not be a problem. If I understand you correctly, the only difference between the plain text and RTF versions is in fact the handling of the formatting, then presumably that means you do not need to design those type individually, and so having an abstract base class is not a problem. Pete

Previous Posts In This Thread:

Submitted via EggHeadCafe - Software Developer Portal of Choice
Using the MS Text Driver to read Delimited Files
http://www.eggheadcafe.com/tutorials/aspnet/c77b7a8d-5240-402e-b5c2-3895d1a2df28/using-the-ms-text-driver.aspx

C# Keyboard Hook Problems

Mon, 8 Feb 2010 16:19:24 -0800 (PST)

Hi,

I'm trying to implement a keyboard hook that will receive all keyboard
events within my application, and only my application, using C# .NET
3.5 and VS 2008.

I'm using the following code:

private delegate IntPtr KeyboardHookCallback(int nCode, IntPtr wParam,
IntPtr lParam);

private static KeyboardHookCallback _callback = new
KeyboardHookCallback(HookCallback);
private const int WH_KEYBOARD_LL = 13;

private static IntPtr SetHook()
{
return SetWindowsHookEx(WH_KEYBOARD_LL, _callback, IntPtr.Zero,
Thread.CurrentThread.ManagedThreadId);
}

[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true,
CallingConvention = CallingConvention.StdCall)]
private static extern IntPtr SetWindowsHookEx(int idHook,
KeyboardHookCallback lpfn, IntPtr hMod, int threadId);

SetWindowsHookEx is returning 0, and Marshal.GetLastWin32Error() is
returning 87. I understand this means there's an invalid parameter,
but that's as far as I can get. I've tried using WH_KEYBOARD (2)
instead of WH_KEYBOARD_LL, and I've tried the deprecated
AppDomain.GetCurrentThreadId(), but this doesn't seem to make a
difference. Any idea where I've gone wrong?

Thanks,
Daniel Sheiner

Re: Function Pointer in Class

Mon, 08 Feb 2010 18:35:09 -0500

Tom Shelton wrote:
> On 2010-02-08, Robert Morley wrote:
>> I'm using Visual C# Express 2008 and I'm trying to implement a function
>> pointer as a member of a class. It sounds like I'm looking for a delegate,
>> but I don't quite understand what I need to do. As you can perhaps guess,
>> I'm relatively new to both C# and .NET in general.
>>
>> The relevant function will be a void with no parameters. My current class
>> looks like this:
>>
>> public class MenuItem : Object
>> {
>> private string name;
>>
>> public string Name
>> {
>> get { return name; }
>> set { name = value; }
>> }
>>
>> //public delegate? void FunctionToCall() would go here
>>
>> public override string ToString()
>> {
>> return Name;
>> }
>> }
>>
>> Not very exciting, is it? There's no constructor because a) This is my
>> first class of any significance and I haven't looked up how to do that yet,
>> and b) I want the function as part of the constructor if possible, so
>> implementation will be dependent on the answer I get in any event. :)
>>
>> The idea is to have an easily-extensible listbox with a variety of functions
>> to call and you just double-click on whatever it is you want to do. When
>> MenuItem is instantiated, I would pass in the name of the function to
>> execute, like:
>>
>> MenuItem mi = new MenuItem("Descriptive Name", MyFunction());
>>
>> Then later in the code, I need to be able to do:
>>
>> mi.FunctionToCall();
>>
>> How do I go about doing this? Or if I'm on the wrong track, how do I do
>> something like it?
>>
>>
>> Thanks,
>> Rob
>
> using System;
> using System.Windows.Forms;
>
> namespace WindowsFormsApplication5
> {
> public partial class Form1 : Form
> {
> public Form1 ()
> {
> InitializeComponent ();
> }
>
>
> private void Form1_Load ( object sender, EventArgs e )
> {
> this.listBox1.Items.Add ( new HelloWorldFunction () );
> this.listBox1.Items.Add ( new YouSucketh () );
> }
>
> private abstract class FunctionItemBase
> {
> protected FunctionItemBase ( string name, Action function )
> {
> this.Name = name;
> this.Function = function;
> }
>
> public string Name { get; private set; }
> public Action Function { get; private set; }
>
> public override string ToString ()
> {
> return Name;
> }
> }
>
>
> private class HelloWorldFunction : FunctionItemBase
> {
> public HelloWorldFunction () : base ( "Hello World!", () => MessageBox.Show ( "Hello, World!" ) ) { }
> }
>
> private class YouSucketh : FunctionItemBase
> {
> public YouSucketh () : base ( "You Sucketh!", () => MessageBox.Show ( "You Sucketh!" ) ) { }
> }
>
> private void listBox1_DoubleClick ( object sender, EventArgs e )
> {
> FunctionItemBase function = listBox1.SelectedItem as FunctionItemBase;
> if ( function != null )
> function.Function ();
> }
>
> }
> }
>

That looks great! Thanks, Tom.

Rob

Re: Function Pointer in Class

Mon, 08 Feb 2010 15:29:58 -0800

On 2010-02-08, Robert Morley wrote:
> I'm using Visual C# Express 2008 and I'm trying to implement a function
> pointer as a member of a class. It sounds like I'm looking for a delegate,
> but I don't quite understand what I need to do. As you can perhaps guess,
> I'm relatively new to both C# and .NET in general.
>
> The relevant function will be a void with no parameters. My current class
> looks like this:
>
> public class MenuItem : Object
> {
> private string name;
>
> public string Name
> {
> get { return name; }
> set { name = value; }
> }
>
> //public delegate? void FunctionToCall() would go here
>
> public override string ToString()
> {
> return Name;
> }
> }
>
> Not very exciting, is it? There's no constructor because a) This is my
> first class of any significance and I haven't looked up how to do that yet,
> and b) I want the function as part of the constructor if possible, so
> implementation will be dependent on the answer I get in any event. :)
>
> The idea is to have an easily-extensible listbox with a variety of functions
> to call and you just double-click on whatever it is you want to do. When
> MenuItem is instantiated, I would pass in the name of the function to
> execute, like:
>
> MenuItem mi = new MenuItem("Descriptive Name", MyFunction());
>
> Then later in the code, I need to be able to do:
>
> mi.FunctionToCall();
>
> How do I go about doing this? Or if I'm on the wrong track, how do I do
> something like it?
>
>
> Thanks,
> Rob

using System;
using System.Windows.Forms;

namespace WindowsFormsApplication5
{
public partial class Form1 : Form
{
public Form1 ()
{
InitializeComponent ();
}

private void Form1_Load ( object sender, EventArgs e )
{
this.listBox1.Items.Add ( new HelloWorldFunction () );
this.listBox1.Items.Add ( new YouSucketh () );
}

private abstract class FunctionItemBase
{
protected FunctionItemBase ( string name, Action function )
{
this.Name = name;
this.Function = function;
}

public string Name { get; private set; }
public Action Function { get; private set; }

public override string ToString ()
{
return Name;
}
}

private class HelloWorldFunction : FunctionItemBase
{
public HelloWorldFunction () : base ( "Hello World!", () => MessageBox.Show ( "Hello, World!" ) ) { }
}

private class YouSucketh : FunctionItemBase
{
public YouSucketh () : base ( "You Sucketh!", () => MessageBox.Show ( "You Sucketh!" ) ) { }
}

private void listBox1_DoubleClick ( object sender, EventArgs e )
{
FunctionItemBase function = listBox1.SelectedItem as FunctionItemBase;
if ( function != null )
function.Function ();
}

}
}

--
Tom Shelton

Re: enumerator

Mon, 08 Feb 2010 15:20:00 -0800

Tony Johansson wrote:
> How can these two examples cause boxing when I use generics with T as string
> ???

Well, the first causes boxing simply by getting the enumerator.
IEnumerable is a reference type (interface) but the implementation is a
value type. Thus, it needs to be boxed.

As for the second example, it's because you are calling
Console.WriteLine(). Even though the enumerator itself doesn't need
boxing, every object enumerated does.

> One of the reasons to use generics is just that no boxing/unboxing need to
> be made.

Console.WriteLine() isn't generic. How is it going to avoid boxing?

> One more question the type that is send to WriteLine is string isn't it so
> here is just the ToString used for String because it is overridden ???

You didn't call ToString(). You are passing the object and letting the
WriteLine() method call ToString(). So the object has to be boxed.

> Now the last question if I use MSDN and lookup List this Enumerator is
> not there.

Yes, it is.

> You can look for youself ??

You can too:
http://msdn.microsoft.com/en-us/library/x854yt9s.aspx

Pete

Function Pointer in Class

Mon, 08 Feb 2010 18:16:38 -0500

I'm using Visual C# Express 2008 and I'm trying to implement a function
pointer as a member of a class. It sounds like I'm looking for a delegate,
but I don't quite understand what I need to do. As you can perhaps guess,
I'm relatively new to both C# and .NET in general.

The relevant function will be a void with no parameters. My current class
looks like this:

public class MenuItem : Object
{
private string name;

public string Name
{
get { return name; }
set { name = value; }
}

//public delegate? void FunctionToCall() would go here

public override string ToString()
{
return Name;
}
}

Not very exciting, is it? There's no constructor because a) This is my
first class of any significance and I haven't looked up how to do that yet,
and b) I want the function as part of the constructor if possible, so
implementation will be dependent on the answer I get in any event. :)

The idea is to have an easily-extensible listbox with a variety of functions
to call and you just double-click on whatever it is you want to do. When
MenuItem is instantiated, I would pass in the name of the function to
execute, like:

MenuItem mi = new MenuItem("Descriptive Name", MyFunction());

Then later in the code, I need to be able to do:

mi.FunctionToCall();

How do I go about doing this? Or if I'm on the wrong track, how do I do
something like it?

Thanks,
Rob

Re: enumerator

Mon, 8 Feb 2010 23:56:53 +0100

"Peter Duniho" skrev i meddelandet
news:%23dv2cjOqKHA.5224@TK2MSFTNGP05.phx.gbl...
> Tony Johansson wrote:
>> Hi!
>>
>> I know I can use the foreach. This is just for understanding.
>> My question is if the rows marked with 1 below is doing the exact same
>> thing as those that are marked with 2. ?
>
> Can you be more specific about what you're asking about?
>
> The two examples definitely do not do the exact same thing. But, the
> extent to which they are different may or may not be important to you. A
> couple of examples in particular:
>
> If you're just using Console.WriteLine(), which takes as the argument
> an object reference (that being the overload selected in this example),
> then the fact that you get a strongly-typed generic enumerator in the
> second example isn't helpful, because the object still winds up boxed.
>
> In the first example, the enumerator instance itself winds up boxed
> (List.Enumerator is a value type), which may or may not be important to
> you.
>
> As for your later question about finding the type in the documentation,
> I'm not sure why you were unable to find the type, but it's clearly a
> nested type in List, so you should be able to find it easily just by
> looking at the documentation for List.
>
> Pete

How can these two examples cause boxing when I use generics with T as string
???
One of the reasons to use generics is just that no boxing/unboxing need to
be made.
One more question the type that is send to WriteLine is string isn't it so
here is just the ToString used for String because it is overridden ???

Now the last question if I use MSDN and lookup List this Enumerator is
not there. You can look for youself ??

//Tony

Re: WPF - Gantt Chart

Mon, 08 Feb 2010 12:26:15 -0800

kazik wrote:
> hi,
>
> do you know, where I can find free Gantt Chart WPF libraries? I can only
> find trial versions.

What features are you looking for? It seems to me that, to implement a
basic Gantt chart, it should not take you very long just to write it
yourself, if you find the available third-party libraries outside your
budget.

Keeping in mind, of course, the need to balance the cost of your own
time against the cost of the library. Frankly, for all but the most
ridiculously over-priced library, if you actually need the feature set
of the library, you're unlikely to be able to develop a one-off solution
at lower cost than simply licensing a library.

Pete

WPF - Gantt Chart

Mon, 08 Feb 2010 21:08:08 +0100

hi,

do you know, where I can find free Gantt Chart WPF libraries? I can only
find trial versions.

regards
daniel

Re: VS2008 *.reg file

Mon, 8 Feb 2010 11:46:01 -0800

I specified as post build event (to be run on successful completion) as

C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\regasm
$(TargetDir)\$(TargetFileName) codebase /regfile:$(TargetDir)\mydll.reg

It worked! Thanks for the hint.

Re: VS2008 *.reg file

Mon, 08 Feb 2010 11:30:32 -0800

AA2e72E wrote:
> regsvr32?
>
> My experience is that you need to use
>
> regasm my.dll /codebase
>
> for the DLL (I did say COM Interop) to be available as a server.

That's fine. It's basically the same idea as regsvr32. The point being
that you can register the DLL without dealing with a .reg file.

If you want to use regasm to register your DLL, just do that as part of
your deployment.

Pete

Re: Expressions and their side effects

Mon, 08 Feb 2010 11:26:30 -0800

trubar a wrote:
> I assume that in math expressions are interpreted a bit differently?
> In other words, in math we would consider a variable x being assigned
> a value of "10" as being the main effect of the expression "x=10"?!

You can "consider" it as whatever you like. There is no concept of
"side-effect" in traditional math (though of course, mathematics
applying to algorithms would tend to use the same definition as found in
computer science), so how you describe the algebraic formula in math has
no relevance to the broader question.

I will point out, however, that in mathematics the = symbol is not an
assignment operator. It's a description of an _existing_ relationship
between the two sides of the formula. There's no "effect" at all, main
or otherwise.

> b)
>> But, the result is also not "x". The result of the expression in that
>> case is "10", regardless of the value in "x"
>>
>> The result of an expression is a value.
>
> I also assume that in math the result of the expression x=10
> wouldnt be a value of 10 ( in other words, in math our expression
> doesnt return any values ) ? Thus, in math the result of expression
> would either be x getting assigned a value or we could perhaps even
> claim that our expression doesnt have a result?!

See above. "In math", the question you are asking doesn't even make sense.

> c)
>> understand that when you write "x = 10", that's an expression, and it
>> returns a value, rather than itself).
>
> So returned value (10) is no longer an expression, but just its
> result?

In programming, expressions are what you write in code. They are part f
the static program description. The value returned by an expression is
something else entirely. It's what an expression in code causes to
happen when the code is actually executed.

So, yesit's trivially true that the "returned value is no longer an
expression", since the expression only has a value at execution time as
a consequence of evaluating it.

Pete

Re: VS2008 *.reg file

Mon, 8 Feb 2010 11:18:03 -0800

Thanks for the hint Konrad.

I've never used build events: it is time for me to learn how to use them.

"Konrad Neitzel" wrote:

> Hi!
>
>
> "AA2e72E" wrote in message
> news:D4C493A0-5F29-48E4-8774-7EDBF3BD0B82@microsoft.com...
>
> > regasm my.dll /codebase /regfile:mydll.reg
>
> > I was hoping for a way to get VS2008 to create the mydll.reg file, perhaps
> > in the release folder.
>
> Just check the Build Events options of your project. Did you try to run that
> command in the "Post-build event command line"?
>
> That way I would add special commands that I want the System to do
> automatically inside the build. And through "Edit Post-build ..." button you
> get access to the Macros (which are simply a set of predefined variables).
>
> Hope this helps a little.
>
> Konrad
>

Re: VS2008 *.reg file

Mon, 8 Feb 2010 20:02:23 +0100

Hi!

"AA2e72E" wrote in message
news:D4C493A0-5F29-48E4-8774-7EDBF3BD0B82@microsoft.com...

> regasm my.dll /codebase /regfile:mydll.reg

> I was hoping for a way to get VS2008 to create the mydll.reg file, perhaps
> in the release folder.

Just check the Build Events options of your project. Did you try to run that
command in the "Post-build event command line"?

That way I would add special commands that I want the System to do
automatically inside the build. And through "Edit Post-build ..." button you
get access to the Macros (which are simply a set of predefined variables).

Hope this helps a little.

Konrad

Re: Expressions and their side effects

Mon, 8 Feb 2010 10:58:48 -0800 (PST)

hi

On Feb 7, 11:34=A0pm, Peter Duniho
wrote:
> trubar a wrote:
> >
>

a)
> The result of an expression is a value. So "x =3D 10" cannot
> be the result of the expression (*).
>
> But, the result is also not "x". The result of the expression in that
> case is "10", regardless of the value in "x".
>
> The result of the expression (expressions always have
> a result) is simply thrown away
>
> The result of an expression is a value.

I assume that in math expressions are interpreted a bit differently?
In other words, in math we would consider a variable x being assigned
a value of "10" as being the main effect of the expression "x=3D10"?!

b)
> But, the result is also not "x". The result of the expression in that
> case is "10", regardless of the value in "x"
>
> The result of an expression is a value.

I also assume that in math the result of the expression =93x=3D10=94
wouldn=92t be a value of =9310=94 ( in other words, in math our expression
doesn=92t =93return=94 any values ) ? Thus, in math the result of expressio=
n
would either be x getting assigned a value or we could perhaps even
claim that our expression doesn=92t have a result?!

c)
> understand that when you write "x =3D 10", that's an expression, and it
> returns a value, rather than itself).

So returned value (10) is no longer an expression, but just its
result?

thank you

Re: Supporting two executables in a solution

Mon, 8 Feb 2010 10:51:22 -0800 (PST)

On Feb 6, 2:47 pm, "Morris" wrote:
> > There's no need to add the dynamically launched EXE as a reference, nor
> > would doing so help. For the Process class, you'll need the EXE to exist
> > as a file at a known location (e.g. in the same directory with the main
> > program), and pass that file path to the Process class.
>
> > Pete
>
> Dear Pete,
> Though there is no need I still think that it may be convinient to add it
> because I may need to modify the second executable along the solution
> development life time, as would be with any dll in the solution.
> Is it posible?
> Regards
> Morris

You can have both projects in the same solution, if that's what you
mean.

Chris

Re: VS2008 *.reg file

Mon, 8 Feb 2010 10:42:01 -0800

regsvr32?

My experience is that you need to use

regasm my.dll /codebase

for the DLL (I did say COM Interop) to be available as a server.

There is an option to acquire the *.reg file with

regasm my.dll /codebase /regfile:mydll.reg

I was hoping for a way to get VS2008 to create the mydll.reg file, perhaps
in the release folder.

"Peter Duniho" wrote:

> AA2e72E wrote:
> > Is there a way to make VS2008 create a *.reg file when compiling a COM
> > Interrop DLL?
>
> Not as far as I know.
>
> > The compilation process creates the *.DLL file and registers it: it would be
> > useful to have the *.reg file to see the chanhes it makes to the Registry as
> > well as for deployment purposes.
>
> The DLL can self-register with regsvr32. You shouldn't need a .reg file
> to register the DLL during deployment.
>
> Pete
> .
>

Re: Is there an escape sequence for Space char? for space delimte

Mon, 8 Feb 2010 13:40:03 -0500

"Rich" wrote in message
news:CBB30EFA-1E46-4180-B969-90E134B44C5E@microsoft.com...

> Yay! I got it work -- turns out that my text file with the 52000 rows was
> this type:
>
> "abc" "def" "ghi" "jkl"
> "abc" "def" "ghi" "jkl"
> "abc" "def" "ghi" "jkl"
> ...
>
> with double quotes surrounding the text. It must have been generated with
> VBA. Anyway, the streamreader in my original routine will read the double
> quotes OK, I was just doing a .Replace(..."\"","") for each piece of data.
> Once I understand the workings of GenericParser I could probably add a
> .Replace to it (somewhere).

parser.TextQualifier = '"' // <-- apostrophe quotation-mark apostrophe