Windows - WM_GETICON Sometimes Returns No Icon Handle
Apr 4, 2011
I'm trying to show all window titles including the corresponding icons, much like Windows Task Manager does. This works only to a certain extent though - although I am able to get the windows' title bar texts, the icon is not always available.
For getting the icon I pass the WM_GETICON message to SendMessage (source):
Public Const WM_GETICON As UInteger = &H7F
Public Function GetWindowIcon(ByVal WindowHandle As IntPtr) As Icon
Dim IconHandle As IntPtr = SendMessage(WindowHandle, WM_GETICON, 0, 0)
[Code].....
For some windows, this returns just the correct icon. For others, it returns Nothing since IconHandle is equal to 0. In Windows Task Manager and on the taskbar they show up just fine.
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Sep 3, 2009
I am using Visual Studio 2005 and .NET 2.0 to display data pulled from a Oracle table. I am trying to display a notes column, but the column is not displaying the CRLF characters properly. The text is showing as a single line.
Private Sub BindNotesGrid()
Dim colRequestNotes As New BoundColumn()
Dim colCreatedBy As New BoundColumn()
Dim colCreatedDate As New BoundColumn()
[code]....
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Jan 2, 2008
I am using the Win32API function EnumWindows to populate a listview with the window text, handle. In this listview I would also like to populate the SmallImageList from an ImageList control of the window's small icon attribute.Now, I have the window handle for each, and I understand their is a number of ways to go about this. I have tried using SendMessage, sending the WM_GETICON value for ICON_SMALL...but that always returns zero.I've read something too about populating a WindowClass structure to get an icon for a particular window.
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Jan 7, 2010
does anyone know how to remove another application's taskbar icon from the taskbar but leaving the window still visible on the desktop for the user to use? I need to do this during runtime using the window handle if that is possible,
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Feb 1, 2009
another problem related to what I posted earlier but a different problem. I've got the open window list and all that, now I'm trying to get icons from the windows... but the only window that I can get to return an Icon is internet explorer?
[Code]...
I know all the variables are set correctly since obviously it can get Internet Explorer's icon, but I can't figure out a way to get icons from any of the other windows. I've tried ICON_SMALL BIG and SMALL2
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Jan 10, 2007
I was testing article [URL] to see if I could use this to populate a listview2 with the icons from Directory.GetFiles(apath) and getDirectories. If you go into c:windowssystem32 the program will hang for about 4 mins then if you go back to windows then back to system32 you will get the error.
win32 handle that was passed to icon is not valid or is the wrong type.
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Feb 11, 2009
This same (Identical ) code works well in another program but does not in windows service... Returns 0 for window handle ...?
Public WindowStr As String = "ImagSrvWindow"
Protected Overrides Sub OnStart(ByVal args() As String)
'necessary to get control to paint Pic&Txt boxes in stream of Browser navs
[Code].....
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May 18, 2010
I tried binding data to combobox at the runtime in the form load event. I had written the following bind function,
Private Sub BindComboBox()
Dim da As SqlDataAdapter
Dim conn As SqlConnection
Dim ds As DataSet = Nothing
[code]....
The problem is cboSubject.SelectedText is returning empty string.
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Mar 7, 2009
I need a little (good quality) version of the Windows XP help icon (blue circle with white question mark) for a contextmenustrip?
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Dec 2, 2010
I am trying to write a program which needs to interact with other programs.For this i need to find the handle of its window and have the user select the right windows. I am thinking of enumerating all windows and put the in a dropdown box. I was able to do this with visual basic but the code does not work wiht vb express. I need some pointer to find the solution.
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Dec 27, 2008
I have work on vb.net 2005, and want to create a small application for handle windows explorer by my application. In this application my needs are.Open Windows explorer on user define Root folder. For example Root Folder is D:ABC and in this root folder some sub folder are present (Number of folder depend on users). For example in under d:ABC three more subfolder are present 1.NSHARMA 2.APOORE 3.SKHANNA, name of folder is user login name in application.
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Jun 11, 2009
I have work on vb.net 2005, and want to create a small application for handle windows explorer by my application. In this application my needs are.Open Windows explorer on user define Root folder. For example Root Folder is D:ABC and in this root folder some sub folder are present (Number of folder depend on users).
For example in under d:ABC three more subfolder are present 1.NSHARMA 2.APOORE 3.SKHANNA, name of folder is user login name in application.I need when NSHARMA login in application then in D:ABC folder only show NSHARMA folder and other folder will hide, D:ABC folder are present on Common Path.In this Application one more common Subfolder under D:ABC it's Name is SharedFolder, it will Share between all user , it can access by at same time all login users and only how will be see it how is permission for it. For Example NSHARMA and APPORE have permission for this then only they will see this subfolder. Then APOORE and SKHANNA will be login in application that time APOORE will see it and SKHANNA does not see it.
[Code]...
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Aug 23, 2009
In vb.net and made a proj. in vb2005. but when i try to load a particular form(opens up in a mdi container like all others in the project) , an error-error creating windows handle pops up, the line is frmadmn(the form).show
What shall i do? i read a lil on the net about too many handles, user objects etc. but the stats of my proj. at the time of error are-handles-350,threads-17,user objects-235 gdi objects - 159. have these anything to do with the prob.. then what should i do..? i read about the dispose command also about how to use it ? what to dispose...?
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Aug 27, 2010
I get this error as below when I open my "frmAddPrivate" more than 5 times. How I can overcome it?
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Sep 21, 2011
I have created a Windows Service in VB.NET (VS2010) that executes a certain task every minute. When the service is being stopped, either manually by the user, or when the system is rebooted, what can I do to make sure the task is being finished properly before the service is actually terminated?
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Nov 6, 2009
My application uses an MDI form, and there are instances where the end user will need multiple child windows open at a time. I need an easy way for the user to switch between windows, which made me think of using tabs kinda like Firefox, or like the tabs in the Visual Studio IDE up at the top where you can switch between open forms and code files.
I'm curious if there is a control in .NET that will already do this? I would rather not re-invent the wheel if I can help it. Google has failed me thus far.
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Apr 9, 2009
The app Im working on is dunning on an embedded xp machine. It recieves input from the serial port from an industrial process, and then a backgroundworker class calculates and updates the single form GUI with the results from the process. Very simple.Now, the customer want to allow automatic download of log files by an USB memory. The process should work like this:
1)User plug in an usb memory
2)SHow a virtual keypad (touch screen) where the user enter a security code
3)If code ok, show a 3 choice screen, if not ok show error message and allow the user to try again.
4) If user choose the "export all" button, this choose form will close and i display another form with a progress bar that show how all files are copied to the usb memory. When this process is complete, I will display teh form that says "remove the usb memory and press ok to restart the application.
As you see here lots of forms are created and disposed based on user choices. My biggest issue here is that I have no clear design pattern to work from.For example.. should I have this "chain" in the main gui form, or should I let each form create the next form. For example on the "select action" form, when I press export, should this form create and show the "copy progress" form, or should all forms be created and destroyed from the main gui form?
Also, such an issue like with the password. I put it as a constant on the main form, to avoid "magic numbers" in the code. And then I ran into problem because the "keypad" form is created on another thread and I can't access the costant on the main form, so I got a cross thread exception.Everything starts when an USB memory is connected. And the OnConnected eventhandler is running on a different thread than the main UI thread. how to design this chain of window creation/deletion is greatly appreciated. I show all forms with the SHowDialog because I dont want the user to be able to close the form unless he/she presses a button. And not by accident press somewhere else.
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May 7, 2010
I have 2 buttons, one that says change icon, and one that has the icon on it. When you press 'change icon' I want you to be able to browse through windows and choose the icon for it.
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Oct 8, 2010
In my program's properties, I customized my application icon, which I also set on the main form's icon property. If I look in my bin/Release folder or if I run my program I see my customized icon. If I right-click and select Send to -> Desktop on Windows XP, I see a shortcut with my ICON on the desktop. If I do the same thing on Windows 7, I get the default ugly icon. What should I do to get my custom icon on Windows 7 when I make a shortcut from my main EXE?
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Apr 15, 2009
What is the best way to handle resolution issues on the monitor when writing a windows app from VB.Net.I developed an app on my laptop, it's widescreen and res is set to 1440 x 900. When I take my app and run it on a machine with an older Analog monitor and the res is 1024 x 768, all of the forms on the right and bottom are cut off.
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Nov 26, 2011
I have searched other forums, google, etc. and have not find a solution. I am creating a VB.NET application using Visual Studio 2010. My application runs fine inside the IDE. Outside of the IDE, it crashes immediately with an OOM exception. I have compiled the program in both VS 2010 and VS2008. The outcome is always the same. I increased my Desktop heap to 12288 meg from 3072 meg thinking that was the issue, but the outcome is the case. Although the increase does improve my response in the IDE. The error is also being reported as related to mscorlib.dll; and my version is for 2.0 framework is 2.0.50727 and for 4.0 framework is 4.0.30319. I am running Windows XP/SP3.
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Sep 17, 2009
Is it possible to send keys to a specific windows handle without having to bring that window to focus?Right now I have the following code almost doing the trick:
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Declare Function SetForegroundWindow Lib "user32" Alias "SetForegroundWindow" (ByVal hwnd As Long) As Integer
Sub SendKeysToApplication(ByVal AppTitle As String, ByVal Keys As String)
[code]....
It will bring the windows calculator window to the top and set the value "1" on it.Is it possible to send the keystroke without poping the window?
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Jan 16, 2011
For an app. I'm making I need to find all the windows that belong to a process.
From all of this windows I want to have the handle and title.
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Apr 27, 2009
I have the code below to access Folder when i right click any folder in windows explorer, it works. My question is i want to add icon to the context menu name like winzip or winrar [code]...
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Aug 16, 2010
I have added a minimize to tray function into my webbrowser and it makes use of the notify icon control. Now I know my code isn't flawed as it works in vista in xp but not in 7 (The icon simply is not in the tray).
Me.Hide()
NotifyIcon.Text = ("Xtreme Browser, Current User: " + Current_User)
NotifyIcon.Visible = True
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Aug 21, 2010
What size should an icon be in a windows forms application. the icon that appears in the upper left corner of a form.
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May 4, 2011
My form having the TitleBar , buttons are Minimize, Maximize, Close. I run the application if i click the Close button the window was closing. But i need not only for closing window i want to close the Database connection also. B`se if i close this window the debugging is not closing. The database is not close properly.
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Mar 5, 2012
how to hide assemblies default icon after running any exe in vb.net(Windows app)? in vb.net running any exe then its icon will be show in the taskbar.how to hide running exe icon using vb.net?
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Mar 5, 2012
how to hide assemblies default icon after running any exe in vb.net(Windows app)?
in vb.net running any exe then its icon will be show in the taskbar. how to hide that icon.how to hide running exe icon using vb.net?
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Feb 14, 2010
i want to design a new program that should start with windows and its icon should appear at the toolbar the idea is when i click on the icon a rectangular forum should appear. my question is that: what is the best tool or control should i use? should i use the blank project of windows application or there is special project for that.
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