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The ListView class encapsulates the List-View common control. Sticking to pure managed code won't accomplish what you need. You must extend the ListView control, override WndProc, and handle windows messages like you would in VC++.
There are plenty of articles here on CodeProject about this, and you should familiarize yourself with the windows messages and common controls by reading Windows Controls[^].
For one example, see a previous post about defining an event to fire when column widths change: http://www.codeproject.com/script/comments/forums.asp?msg=807702&forumid=1649#xx807702xx[^].
Another good article about handling notification messages for the List-View common control (because that's really what this all comes down to) is http://www.codeproject.com/cs/miscctrl/listviewfilter.asp[^].
In your case, since you're paining, you'll need to handle the NM_CUSTOMDRAW message (for a list-view). This will, once you've handle the right sequence of windows messages, give you an HDC (handle to a device context). You can get a Graphics object from this by using Graphics.FromHdc, but simply overriding the OnPaint method (or handlig the Paint event, which is much slower and a bad idea when done in a derived control) will not work. You must draw to the DC that the list-view is using for the list-view column header.
Microsoft MVP, Visual C#
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I want to know that wich form is running now in my project at design time.
and then, know properties and field that each form have(at runtime).
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Use reflection. Read Discovering Type Information at Runtime[^] in the .NET Framework SDK.
You can also use the ComponentModel to discover type information in a more design-time friendly way. Read about the TypeDescriptor and it's members in the .NET Framework sDK as well.
As far as which form is "running", that's entirely up to your implementation, especially since I have no idea of what you're talking about.
Microsoft MVP, Visual C#
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I'm curious to know and I hope none of you get the wrong idea. I was just wondering if this is possible it doesn't matter if its yahoo or whatever. I just use yahoo as an example. If the window is open and you see your friends names in say billy,bob,sam. Instead of taking and doing a hi pm to each and every one of them. Is there a way in c# to read the names from the other control (yahoo window) and then let you pm then all at one time? If that is too much is there a way to read text from another window into c#? If i have word open would there be a way to tell it read what is on that screen into the text box on my windows form. Just curious.
Win32newb
"Programming is like sex, make one mistake and you have to support it for a long time"
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You would probably need to use Spy++ to capture the handle of each sub-window (input textbox) for each IM window you have open. After that you would need to have your application perform a SendMessage with a WM_SETTEXT message included to apply the text you want each window to have. Make sense?
- Nick Parker
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Yeah i see what your talking about much like is done in c++. The thing is and maybe you can shed some light on the subject. How exactly do you use spy++? I'm kinda new to the programming field so I ask out of lack of knowledge. My understanding with spy is it gives me the (handle if you will) the hex or dword value of the control? I tried running it before but was lost. Is there any kinda free documentation other than the sdk and msdn. I don't mind reading those but sometimes they are too far advanced and I just shake my head and go whatever. Thanks for your information. And also i assume that if i wanted to read in the data from the control it would be ReceiveMessage?
thanks again
Nick Parker wrote:
You would probably need to use Spy++ to capture the handle of each sub-window (input textbox) for each IM window you have open. After that you would need to have your application perform a SendMessage with a WM_SETTEXT message included to apply the text you want each window to have. Make sense?
Win32newb
"Programming is like sex, make one mistake and you have to support it for a long time"
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Open it up and try it. It's a simple-to-use window style and message viewer. It's in your Start menu, under the program group for Visual Studio (whatever version)-<Tools (or something similar).
Just try it out - it's not a difficult program, and there's always the Help menu. It's how we learned.
Microsoft MVP, Visual C#
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You can do this programmatically at runtime, too, instead of using Spy++ as Nick said. You have to P/Invoke FindWindow and/or FindWindowEx, which you can search for windows using their title or class name (better using the class name since it'll never change).
Using this, you can keep calling FindWindow(Ex) using the previous found window as the parent until you get to your child (since the screen name may be in an edit control which may be in a list-box control, which may be hosted in a dialog, etc.), and then call WM_GETTEXT to get their screen name.
There's no truly generic way of doing, this, though. What Nick and I mentioned would be the closest thing to generic as possible, since you could design your recursive window finding algorithm to use heuristics to find screen names; when it does, it knows it's found the right window (that contains the screen names).
Microsoft MVP, Visual C#
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First and formost thank you as always for your help. Nick thank you as well. I like how you give me an idea and force me to run with it. In any case I have a question.
I like your method of using the FindWindow apposed to having to search in spy++ every time. I somewhat have It working but here is the deal. I have the following.
I have a little application that comes up to enter the class name and enter the window name. Here is where I run into the problem. I can see in spy++ that I have say for notepad for instance. I have classname NotePad and then a subwindow class named Edit. I have something like this
public class Win32
{
public const uint WM_SETTEXT = 0x000C;
[DllImport("user32.dll")]
public static extern int FindWindow(
string lpClassName,
string lpWindowName
);
[DllImport("user32.dll")]
public static extern long SendMessage(
int hWnd,
uint msg,
uint wparam,
string text
);
then i have in my form a button event as follows
private void button1_Click(object sender, System.EventArgs e)
{
int i=Win32.FindWindow(txtClsNm.Text ,txtWndNm.Text);
Win32.SendMessage(i,Win32.WM_SETTEXT,0,"Testing my program");
}
The trouble I'm having is this. As you stated I could call FindWindow using the previous window as the parent. I kinda see what your talking about My question though is how do I let the function know? Example, if Edit Class is a sub of NotePad what do I call in order for it to address Edit?
I tried passing with the textbox for the class name NotePad Edit but that doesn't seem to work. So basically I'm asking kick me in the arse and let me buy a clue 
If I Call NotePad and then the Window Name of Untitled The title bar changes to Testing my program so I know I'm at least on the the right track. Thanks again Hope to not be too much of a pest in my learning days 
Win32newb
"Don't Laugh, I can't help it I was born this way "
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If FindWindows returns 0 it couldn't find it....
/\ |_ E X E GG
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public const int WM_SETTEXT = 0x000C;
[DllImport("user32.dll")]
static extern int FindWindow(string lpClassName, string lpWindowName);
[DllImport("user32.dll")]
static extern int FindWindowEx(int hwndParent, int hwndChildAfter, string lpszClass, string lpszWindow);
[DllImport("user32.dll")]
static extern int SendMessage(int hWnd, int Msg, int wParam, string lParam);
int ParenthWnd;
int hWnd;
private void button1_Click(object sender, System.EventArgs e)
{
string lpszParentClass = "Notepad";
string lpszParentWindow = "Untitled - Notepad";
string lpszClass = "Edit";
ParenthWnd = FindWindow(lpszParentClass, lpszParentWindow);
if (ParenthWnd==0)
Console.WriteLine("Notepad Not Running");
else
{
hWnd = FindWindowEx(ParenthWnd,hWnd,lpszClass,"");
if (hWnd.Equals(IntPtr.Zero))
Console.WriteLine("What the F??? Notepad doesn't have an edit component ?");
else
{
MessageBox.Show("Notepad Window: " + ParenthWnd.ToString());
MessageBox.Show("Edit Control: " + hWnd.ToString());
string hi="hello";
SendMessage(hWnd, WM_SETTEXT, hi.Length, hi);
}
}
}
/\ |_ E X E GG
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eggie5 wrote:
hWnd = FindWindowEx(ParenthWnd,hWnd,lpszClass,"");
This is what I was trying to figure out and thanks. Just trying to learn this stuff. I know I crazy questions just I lack the experience that others on here have but one day I'll be able to to run with the big dogs. But by the then they will have newer toys haha. Will I ever win 
Thanks again.
tony
Win32newb
"Programming is like sex, make one mistake and you have to support it for a long time"
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Here's a better explinaion of the method...
The FindWindowEx function retrieves the handle to a window whose class name and window name match the specified strings. The function searches child windows, beginning with the one following the given child window.
If the function succeeds, the return value is the handle to the window that has the specified class and window names.
PARAMETERS
· hwndParent
Identifies the parent window whose child windows are to be searched.
If hwndParent is NULL, the function uses the desktop window as the parent window. The function searches among windows that are child windows of the desktop.
· hwndChildAfter
Identifies a child window. The search begins with the next child window in the Z order. hwndChildAfter must be a direct child window of hwndParent, not just a descendant window.
If hwndChildAfter is NULL, the search begins with the first child window of hwndParent.
Note that if both hwndParent and hwndChildAfter are NULL, the function searches all top-level windows.
· lpszClass
Points to a null-terminated string that specifies the class name or is an atom that identifies the class-name string. If this parameter is an atom, it must be a global atom created by a previous call to the GlobalAddAtom function. The atom, a 16-bit value, must be placed in the low-order word of lpszClass; the high-order word must be zero.
· lpszWindow
Points to a null-terminated string that specifies the window name (the window’s title). If this parameter is NULL, all window names match.
I don't know how much sense that makes to you but.... I dont' really know either.
/\ |_ E X E GG
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You need to P/Invoke FindWindowEx in order to specify the parent from which searching begins.
Microsoft MVP, Visual C#
My Articles
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Yeah, thanks I figured it out after i posted. I go duh wait a minute he said FindWindowEx in his post as well so I did like a good little newbie and looked it up. Then eggie posted and my code is almost identical so I'm on the right track just headed the wrong way
Anway, as always thanks again. If you are a father enjoy fathers day. If your not hope you enjoy with your father.
Win32newb
"Programming is like sex, make one mistake and you have to support it for a long time"
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I think WM_GETTEXT only returns the length of the text. Uh, is this what you meant?
Nevermind, it's just really complicated...
/\ |_ E X E GG
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Well, you are right it is complicated. However, i just take one step and time and when I figure it out and understand it I can look back laugh and go man i made this harder than it really was and wow this stuff is cool I don't know I just always wanted to know how programs controlled other programs because i remember long time back in 95 I would use I think it was macro recorder or something like that would generate task for me. Now with the help of you and others, I see where I can do this automation but in a better way. Like I use this program called Total Recorder don't know have heard of it but it lets you record streaming audio. Anway, there is a radio show that comes on called Art Bell (Coast to Coast) and most of the time I'm a sleep so I have to get up and turn the recorder on then go back to bed. Now all I will have to do is find the message handlers and pass them the wm_control command and few other things and it will do all this automatically for me by simply setting a timer in the program. And I can get one of those timers that turn the electricity on and off to my stereo. Ha sorry for the ramble just see this as fun.
Thanks again.
Win32newb
"Programming is like sex, make one mistake and you have to support it for a long time"
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Hey, I have a working sample of reading some text using the SendMessage and WM_GETTEXT. Check it out...
Add this to your class...
[DllImport("user32.dll")]
static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam,
[Out] StringBuilder lParam);
This was just on a a form with one button and a text box for the handle, here is the button click code. All it does is take the hex handler spy++ gives you and converts it to dec for the method. It removes the extea '0's at the beginning also.
private void button1_Click(object sender, System.EventArgs e)
{
char [] arr = {'0'};
string handle=this.textBox1.Text;
handle=this.textBox1.Text.TrimStart(arr);
IntPtr hWnd = new IntPtr(Convert.ToInt32(handle, 16));
MessageBox.Show(GetWindowText(hWnd));
}
Here is the method, pretty simple...
public static String GetWindowText(IntPtr hWnd)
{
IntPtr txtLength;
IntPtr retValue;
IntPtr zeroVal = new IntPtr(0);
retValue = SendMessage(hWnd,WM_GETTEXTLENGTH,zeroVal,zeroVal);
txtLength = retValue;
StringBuilder sb = new StringBuilder(txtLength.ToInt32() + 2);
retValue = SendMessage(hWnd, WM_GETTEXT, txtLength, sb);
return sb.ToString();
}
Just start spy++ and click file then find window, and then drag that little cross hair thingy over something... like ie's address bar. Then spy++ gives you the hex handle. Just paste that into the text box on the fort and the message box will show the text...
Do you know about pinvoke.net[^]? That site helped me alot alot.
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I was looking at your code and not really understanding this part. Why are you using zeroVal when its a IntPtr instead of a StringBuilder? It gives an error in the compiler as well.
c:\test\notepad writer\Form1.cs(183): Argument '4': cannot convert from 'System.IntPtr' to 'System.Text.StringBuilder'
it is in reference to:
Thanks again.
Win32newb
"Programming is like sex, make one mistake and you have to support it for a long time"
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That will do it. Thanks to pinvoke.net.
public static String GetWindowText(IntPtr hWnd)
{
IntPtr txtLength;
IntPtr retValue;
IntPtr zeroVal = new IntPtr(0);
retValue = SendMessage(hWnd,WM_GETTEXTLENGTH,zeroVal,zeroVal);
txtLength = retValue;
StringBuilder sb = new StringBuilder(txtLength.ToInt32() + 2);
retValue = SendMessage(hWnd, WM_GETTEXT, txtLength, sb);
return sb.ToString();
}
/\ |_ E X E GG
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How doo you do that? Have you add Serializable attribute to your class?
Mazy
"One who dives deep gets the pearls,the burning desire for realization brings the goal nearer." - Babuji
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I have a component that contain a collection of a struct.
I drag and drop this component on a form. than i chang it collection, i want when i close form at design time, my collection content save automatically with form(into form's code or resource).
I use this attribute :"[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]".
but this attribute can save only simle data type such "int" or "string" or ...
and not work for collection of a struct or class. my collection code is here :
using System;
using System.Collections;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Drawing;
using System.Windows.Forms;
using System.Data ;
namespace DesignerSerializationVisibilityTest
{
// The code for this user control declares a public property of type DimensionData with a DesignerSerializationVisibility
// attribute set to DesignerSerializationVisibility.Content, indicating that the properties of the object should be serialized.
// The public, not hidden properties of the object that are set at design time will be persisted in the initialization code
// for the class object. Content persistence will not work for structs without a custom TypeConverter.
public class ContentSerializationExampleControl : System.Windows.Forms.UserControl
{
private System.ComponentModel.Container components = null;
int _x ;
public int X
{
get{return _x;}
set{_x=value;}
}
[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
public DimensionData Dimensions
{
get
{
return new DimensionData(this);
}
}
[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
public FieldClollectionClass ss
{
get
{
FieldClollectionClass dd=new FieldClollectionClass() ;
FieldColumn fc=new FieldColumn() ;
fc.DisplayName="AAAAAAAAAAA" ;
fc.FieldName="BBBBBBBBBBBBBB" ;
dd.Add(fc) ;
return dd ;
}
}
#region FiledColumnClass
public class FieldColumn
{
private string m_fieldName ;
[ReadOnly(true)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
public string FieldName
{
set
{
m_fieldName=value ;
}
get
{
return m_fieldName ;
}
}
public void SetFieldName(string f)
{
m_fieldName=f ;
}
private string m_displayName ;
public string DisplayName
{
get
{
return m_displayName ;
}
set
{
m_displayName=value ;
}
}
private DataTable m_columnDataTable ;
public DataTable ColumnDataTable
{
get
{
return m_columnDataTable ;
}
set
{
m_columnDataTable=value ;
}
}
private bool m_isKey ;
public bool IsKey
{
get
{
return m_isKey ;
}
set
{
m_isKey=value ;
}
}
private string m_childTableValue ;
//[DefaultValue("code")]
public string ChildTableValue
{
get
{
return m_childTableValue ;
}
set
{
m_childTableValue=value ;
}
}
private string m_childTableName ;
//[DefaultValue("name")]
public string ChildTableName
{
get
{
return m_childTableName ;
}
set
{
m_childTableName=value ;
}
}
private int m_width ;
public int Width
{
get
{
return m_width ;
}
set
{
m_width=value ;
}
}
private bool m_visible ;
//[DefaultValue(true)]
public bool Visible
{
get
{
return m_visible ;
}
set
{
m_visible=value ;
}
}
}
#endregion
[TypeConverterAttribute(typeof(System.ComponentModel.ExpandableObjectConverter))]
public class FieldClollectionClass : CollectionBase
{
[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
public FieldColumn this[int index]
{
get
{
return( (FieldColumn) List[index] );
}
set
{
List[index] = value;
}
}
public int Add( FieldColumn value )
{
return( List.Add( value ) );
}
public int IndexOf( FieldColumn value )
{
return( List.IndexOf( value ) );
}
public void Insert( int index, FieldColumn value )
{
List.Insert( index, value );
}
public void Remove( FieldColumn value )
{
List.Remove( value );
}
public bool Contains( FieldColumn value )
{
// If value is not of type FieldColumn, this will return false.
return( List.Contains( value ) );
}
}
public ContentSerializationExampleControl()
{
InitializeComponent();
}
protected override void Dispose( bool disposing )
{
if( disposing )
{
if( components != null )
components.Dispose();
}
base.Dispose( disposing );
}
private void InitializeComponent()
{
components = new System.ComponentModel.Container();
}
}
[TypeConverterAttribute(typeof(System.ComponentModel.ExpandableObjectConverter))]
// This attribute indicates that the public properties of this object should be listed in the property grid.
public class DimensionData
{
private Control owner;
// This class reads and writes the Location and Size properties from the Control which it is initialized to.
internal DimensionData(Control owner)
{
this.owner = owner;
}
public Point Location
{
get
{
return owner.Location;
}
set
{
owner.Location = value;
}
}
public Size FormSize
{
get
{
return owner.Size;
}
set
{
owner.Size = value;
}
}
}
}
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Brand new to C# here, so thanks for bearing with me. What I want to do is probably really easy, but I sure 'nuff can't find the answer on my own.
I have an aspx page with some C# code-behind and a simple button control. I want the click event on that button to launch a new aspx page sized to about 600 x 600. Just a popup window. I've tried Response.Redirect and Server.Transfer, but neither one of them seems to do what I need. A different form in the same project uses a hyperlink formatted as follows: javascript:var w=window.open('pforms/forgotpassword.aspx','test', 'width=350,height=200,scrollbars=no,resizable=yes'). I want to do basically the same thing as that hyperlink, but in C# as a button click event. Can't use a hyperlink on my aspx page for several reasons, but mainly because the event is also running some C# code. Help? Thanks!
Joel
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The most important thing to realize is that ASP.NET is all server-side code (with the help of a couple javascript files to help with form validation). Popping up a window is completely client-side. The server can't tell the client to open a window or direct the browser to a new window - all it can do is generate and send content.
So, the server click event needs to use Page.RegisterClientScriptBlock or Page.RegisterStartupScript to register a fragment of javascript that will do this.
It's not that hard to do at all, but if you want more help, ask in the ASP.NET forum where this question should've been posted originally.
Microsoft MVP, Visual C#
My Articles
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Awesome, dude. Thanks!
Joel
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