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i get this error msg after compiling using QEMU.
,missing method expectation was unhandeled.
method not found...,system.object . system.windows.threading.dispatcher,invoke(system.delegate,system.object[])
trouble shooting tips: if a method in a class library has been removed, recompile any assemblers that referrence that library.
general help fo this exception.
why i get that msg ? thanks.
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Have you tried this?[^] It seems to be a suggestion to the same question that you asked a few hours ago. Did you follow up that suggestion? If you did, what was the outcome? If not, why not?
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I'm fairly new to C#, and have written a small app to test something I needed to do in a bigger app. The app is simple, has a single main form and the routine creates a task bar icon. The only event that is serviced is when the user doble-clicks on the icon in the tray. Double clicking will hide the main window, double clicking again will show the main window. All that I understand, but he mapping of the ShowWindow functions has me seriously confused. I kind of understand the mapping of the ShowWindow function, but the Handle argument with the call makes no sense. Handle isn't declared anywhere, isn't intialized and yet the thing works. I've included thye code below:
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
namespace Foo_Bar
{
///
/// Summary description for Form1.
///
public class Form1 : System.Windows.Forms.Form
{
private System.ComponentModel.IContainer components;
public Form1()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
}
///
/// Clean up any resources being used.
///
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows Form Designer generated code
///
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
///
private void InitializeComponent()
{
this.components = new System.ComponentModel.Container();
System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Form1));
this.notifyIcon1 = new System.Windows.Forms.NotifyIcon(this.components);
//
// notifyIcon1
//
this.notifyIcon1.Icon = ((System.Drawing.Icon)(resources.GetObject("notifyIcon1.Icon")));
this.notifyIcon1.Text = "notifyIcon1";
this.notifyIcon1.Visible = true;
this.notifyIcon1.DoubleClick += new System.EventHandler(this.notifyIcon1_DoubleClick);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(192, 110);
this.Name = "Form1";
this.Text = "Form1";
}
#endregion
///
/// The main entry point for the application.
///
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
private System.Windows.Forms.NotifyIcon notifyIcon1;
private const int SW_HIDE = 0;
private const int SW_RESTORE = 1;
private static bool VisibleBoolean = true;
[System.Runtime.InteropServices.DllImport(
"user32",
EntryPoint="ShowWindow",
ExactSpelling=true,
CharSet=System.Runtime.InteropServices.CharSet.Ansi,
SetLastError=true)]
public static extern int ShowWindow(IntPtr hWnd, int nCmdShow);
private void notifyIcon1_DoubleClick(object sender, System.EventArgs e)
{
if (VisibleBoolean)
{
ShowWindow(Handle, SW_HIDE);
VisibleBoolean = false;
}
else
{
ShowWindow(Handle, SW_RESTORE);
VisibleBoolean = true;
}
}
}
}
Help
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Handle is declared (without your knowledge). It's a property of this (the Form). 
/ravi
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Handle is inherited from the Form class (which inherits it from the Control class). It's initialized during the construction of the Form1 object.
Congrats on being new and understanding how to use DllImport to call native functions, but there's an easier way that doesn't involve any of that. The Form class also has Hide() and Show() methods that accomplish the same thing as calling ShowWindow(...), and it has a Visible property that is the same thing as your VisibleBoolean.
I suggest that you either read the docs on the Form[^] class or use the Visual Studio intellisense to see what functionality already exists.
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Yep, found them... Sorry, did an internet search for hiding main window and got a lot of "It's tough" Didn't think about a hide or show method for the form. One last question... why do you (not you personnaly) not have to (or can't) include the form name when using the hide or show methods? Like this.Form1.Hide (), or this.Form1.Visdible. Beyond the obvious it seems to me that would at least be optional. I know, beginner question...
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Form1 is the type of the object, "Form1" is the value of the Name property of the object. The Name is just a place to store a user friendly and unique identifier for an object. The programmer friendly identifier is the variable name, in this case it's this.
I'm not sure what value there would be in being able to write this.Form1.Hide(), the compiler already knows the type of the this object, and programmer must be aware of it to be using it's members.
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"Form1" is the class name. "this" refers to a specific instance of that class, an actual object.
You must use the class name when referring to static variables of that form, and you must (or can) use the instance reference when referring to instance variables.
Trying to precede the class name with the instance reference (this.Form1) is not really meaningful, and more than a bit confusing.
The "this" keyword is optional mainly because people get tired of typing it, I think. But there are cases where it must be used. When you have a class-scope variable and a method local variable with the same name, the "this" keyword specifies the class-scope variable. Otherwise, the local-scope variable is used.
Codemonkeys don't do it at all. Too busy coding.
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hello
i have an object A which is containing an object B0 = People ( abstract class)
class B1, B2, B3 are derived class from B0
i show my object A in a propertygrid and i want to select ( create instance) for property People with instance B1, B2 or B3
how can i do that with TypeConverter or something else
i already know make it with collection ( using an derived collection editor)
but for objects in property grid i do not
can somebody help me
thanks
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how do i create 9 buttons on the form create on the fly? 
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That's homework kind of question. Tell us what you have tried. 
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for i = 1 to 9
form1.addComponent(new Button)
pseudocode 
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Is this C#? I think not.
जय हिंद
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Assuming you are using Visual Studio and know how to do it with the Designer, look at the code Designer creates (it probably is in file myForm.designer.cs) and do something similar either in the form's constructor or its Load handler.
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I have VS 2008 and have 3 different versions of SQL server running in my network. I tried a sample from the MSDN documents for finding server instances running in the network.
http://msdn.microsoft.com/en-us/library/a6t1z9x2.aspx[^]
I added
using System.Data.Sql;
to a simple starter app and a datagridview to the form. In the load event I use this code..
// Retrieve the enumerator instance and then the data.
SqlDataSourceEnumerator instance =
SqlDataSourceEnumerator.Instance;
System.Data.DataTable table = instance.GetDataSources();
dataGridView1.DataSource = table;
dataGridView1.Refresh();
when the apps runs it eventually bring back the 3 db server's PC name but the rest of the data (according to the docs should be ServerName, InstanceName, IsClustered, and Version)is not returned.
Anybody know why??
tia
rafone
Statistics are like bikini's...
What they reveal is astonishing ...
But what they hide is vital ...
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I have just tried your code on my system and it works as per the documentation.
I cut and pasted your code, so provided that the posted code is accurate, I cannot help. Sorry!
Henry Minute
Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”
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Thanks Henry;
So you did get the InstanceName, IsClustered, and Version in addition to the the Server names...right?
rafone
Statistics are like bikini's...
What they reveal is astonishing ...
But what they hide is vital ...
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Yes, exactly as the documentation in the link you gave.
I would only add, that both the server instances on my system are Express versions 2005 and 2008. Don't know if that would make any difference though.
Henry Minute
Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”
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I have a main form 'frmMain' and another form for tools 'toolBox' owned by the main form. I would like these two forms to always have appearance as if their both titlebars are active simultaneously. Example of such behaviour is in MS Paint: the tools window when it's undocked and the main window. How do i accomplish this?
modified on Saturday, April 18, 2009 11:08 AM
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Have you tried setting the TopMost property of your 'toolbox' window to true?
Henry Minute
Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”
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I did try, but it's the same. When one form gains focus, other's titlebar fades. And, besides, with topmost property, the form is above all forms, even the ones from other applications, and that is unwanted sideeffect. I did find an example how this could be achieved in VB.NET: http://www.andreavb.com/forum/viewtopic_3772.html, but my attempts to convert it have failed.
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Take a look at this[^]. it uses the same techniques as the VB link you gave but it is in C#. Scroll down to the heading Painting the non-client area
Have a go at it, and come back if you get stuck.
Henry Minute
Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”
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I have the solution. Someone on MSDN forum showed me how to do it, and it's amazingly simple:
protected override void WndProc(ref Message m)
{
if (m.Msg == 0x86)
m.WParam = (IntPtr)1;
base.WndProc(ref m);
}
I just placed this function inside both forms and it works. But there is still another problem. The forms are painted as active even when i activate some other application. That is not good. It brings confusion. I need to find a way to bypass these functions in both forms if another application gets activated. Any idea?
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Have a look at this[^]. Perhaps you can make a method from the principle used and then in WndProc do something like:
if ((m.Msg == 0x86) && (this.IsActiveApplication))
{
m.WParam = (intPtr)1;
}
Hope this helps.
Henry Minute
Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”
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Im trying to extract albumart from ID3 tags using TagLib Sharp. I am able to get all other info except for the pictures, I cant seem to figure it out. Anyone have any experience with TagLib Sharp?
Heres my trouble:
Everything works fine but the pictures
private void songInfo(string url)
//Sets info for song info pane. The current URL being played
//is passed in; the labels are derived from the ID3 tags.
{
int i = 0;
TagLib.File file = TagLib.File.Create(url);
lblName.Text = file.Tag.Title;
lblArtist.Text = file.Tag.FirstPerformer;
lblAlbum.Text = file.Tag.Album;
lblYear.Text = Convert.ToString(file.Tag.Year);
foreach (TagLib.IPicture pic in file.Tag.Pictures)
{
pboxAlbumArt.Image = pic.Data;
}
}
Heres where I hit trouble, doing this gives me an error saying it cannot convert a bytevector to an image. Firts of all is this the correct way to do this nd if so, how would I go about converting a bytevector to an image?
Thanks
Jon
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