FindWindow API Not Working?
Mar 2, 2011
Am trying to detect if a window is running, the result always returns a rather large number instead of 0 and I'm not sure why. All documentation I've read states this is right.
Private Declare Function FindWindow Lib "user32.dll" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Dim ClassName As String = vbNullString
Dim WindowName As String = "some fake window"
[code]....
but is there a way to search for a single process without using a For statement?
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Aug 11, 2009
I've been using the FindWindow API for some time now, and it seems as if the function opts for an Windows Explorer window before any other window with the same window title.
For example, if you have a folder named Calulator open, along with the Calculator application built into Windows, FindWindow will return the handle to the folder every time.
I just thought this was an interesting occurrence, and I was wondering whether anyone knew if this is the case every time (an Explorer window over any other window) when using the FindWindow API.
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Nov 9, 2009
I've been trying to use the FindWindowA api and also the FindWindowEx api in a little VB.NET 3.5 app and it doesn't appear to work. I get a positive long value returned whether I have an open window with the correct title or not. Anyone else noticed this?
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Aug 5, 2009
I just can't seem to get this right, what I'm trying to do is use FindWindow to find the windows of more than one window. Here is the code:
app_hwnd = FindWindow(vbNullString, CheckedListBox.CheckedItems)The thing is, if I use .SelectedItem, it only finds one window and if i use CheckedItems/SelectedItems it gives me an error: "Value of type 'System.Windows.Forms.ListBox.SelectedObjectCollection' cannot be converted to 'String'."
So right now, I'm confined to using FindWindow for only one window--when I want to do it for more than one window.
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Jul 3, 2010
Im trying to make findwindow but it dosent work for me why ?
If FindWindow("NOTEPAD") Then
MsgBox("The window does not exist.")
Else
[code].....
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Apr 27, 2010
Does anybody know what is the equivalent of findwindow or findwindex in vb.net. Here is what I am trying to do. I am reading a Real Time Adherence window that is dynamic(assumption) and is constantly refreshing. I have tried Findwindow and Findwindowex although I am able to get to the MDIclient and then to the window there is no "edit" field for me to read off. I have tried Spy++ and it also sees it but it does not have an available control for me to read the information.
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May 15, 2009
I am developing an application that reads an MDI applications child window and grabs the information from a control such as a textbox or listbox. I have tried to use Findwindow in order to accomplish this. I have gotten all the way to the control, but once I get there it returns blank. Can anyone point me in the right direction to accomplish this.I am able to read the window title and get the control title but when I send a message to the window it returns 0. Now I am just experimenting so I have no concrete code, but here is a snippet.
Some of the code I have gotten online.
[code]...
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Nov 17, 2006
I need to send two keys (" " and {Enter}) to a security warning in an Acrobat Window from a VB.NET application. Here is the function I use :
Private Sub SendAcroKey()
Dim HWND As IntPtr
HWND = FindWindow("Adobe Acrobat", vbNullString)
[Code]....
But I can't get FindWindow() to work properly, it always returns "0". I guess I'm not giving the good parameters, lpClassName and lpWindowName, but I dont now how to get the right ones. So here is the question : How can I know the lpClassName and lpWindowName of a security warning in Adobe Acrobat 7 professional ???
I really have to work this out but theres not much information on the web about those function, even on MSDN.
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Apr 22, 2010
use API return a handle by FindWindow
Public Class Form1
Private Shared Function FindWindow( _
ByVal lpClassName As String, _
ByVal lpWindowName As String) As IntPtr
End Function
'....
End Class
My question, what value should be passed into Function FindWindow(lpClassName, vbnullstring)? Can I use "Form1"?
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Mar 22, 2009
i searched all over this forum , and everywhere its the same, [code]i keep getting "found" even when the calculator is off!
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Mar 19, 2010
If i use this, it will give me the handle of the window "Test Window 1.0"
[Code]....
but what if the caption of the window changes? how do you find it? If it change to "Test Window 2.0" ? Program like Explorer caption always changes.
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Dec 29, 2009
I supposed they should return the same values but oddly when I tried it I am getting different results?
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Oct 11, 2010
i am trying to figure out how to go about finding this window's label when the control name is the same as all the other labels on the program.
WindowsForms10.STATIC.app.0.378734a
WindowsForms10.STATIC.app.0.378734a
WindowsForms10.STATIC.app.0.378734a
[code].....
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Mar 28, 2011
How would I use FindWindow to get the handle to a textbox on my form?
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Nov 20, 2009
I have spent the last 3 hours trying to figure this out with no success:The WIndows XP phone dialer has a "Hide Calls" available from the context menu, can someone run Spy++ (or similar) over it and let me know what message i should be looking out for to fire the "hide calls" option. Also, do i send it to the child ("Preview") or the parent ("Phone Dialer")
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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 13, 2011
I am using VB Express 2008, on Windows XP Pro. I have written a programme which tests another programme which compares prices and terms from several vendors. This Bid Tabulation programme, compares prices and terms of up to 10 Bidders and 500 line items in mixed currencies.The testing programme, initially, would not work and I discovered that I needed to introduce a delay in order for it to run the Bid Tabulation programme. So my initial code, using the delay, was:
[code]...
And the button was clicked, and the Bid Tabulation programme started and ran successfully, as long as the number of vendors was 5 and the number of line items was 5. when I tried to increase the number of vendors to 10, the programme failed.I then discovered that at the point of failure, when the particular ParentHWND=0, if I introduced:
[code]...
Does anyone know what I am doing wrong, or whether there is another way to assure that ParentHWND will not equal zero without using a time delay?
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Dec 4, 2006
I just bought a nice G15 Gaming Keyboard. It has a nice LCD screen with media keys (Play, Stop, Next, Previous etc,).Anyway, I managed to intercept the original functions to WMP of it (By Global Hotkeying them).Now, I have to send mouse clicks to my own Music Player (Playa!TraX, it isn't my creation) on a specific coord.This is the code i have, it finds the window, and says it clicks, but nothing happens, what am I doing wrong?
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal Hwnd As IntPtr, ByVal wMsg As Integer, ByVal wParam As Integer, ByVal lParam As Integer) As Integer
[code].....
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Oct 11, 2010
i am trying to figure out how to go about finding this window's label when the control name is the same as all the other labels on the program.
WindowsForms10.STATIC.app.0.378734a
WindowsForms10.STATIC.app.0.378734a
WindowsForms10.STATIC.app.0.378734a
All 3 labels are named the same. The one i am most interested in is a progress % counter (1%, 2%, 3%, etc..)How can i get the value (using a timer of course) from that label without knowing the caption of it at any given time?
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Nov 24, 2009
Is it possible to use a "FindProcess" instead of FindWindow?
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Sep 3, 2009
I found on msdn samples and modified (add Thread.GetDomaind.UnhandledException)
<SecurityPermission(SecurityAction.Demand, Flags:=SecurityPermissionFlag.ControlAppDomain)> _
Public Sub Main()
' Add the event handler for handling UI thread exceptions to the event.[code].....
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Jun 18, 2009
It appears that my favorite thing in the world is tackling projects that are beyond my current knowledge and abilities. I have a little project that I am working on which is a simple image viewer stocked with (upon completion) your standard Load..., Next/Previous, Zoom In/Out, Actual Size, and Full Screen capabilities. However, I am running into a few snags:
(1) I've been able to get my "Load..." button to display a file dialog box, but I cannot seem to get a working filter (with which only image file types are allowed to be selected) in working order.
(2) I have a PictureBox object (entitled PictureBox1) that displays the image selected via the file dialog box, but it loads images in their full size (1:1/100% zoomed) state without scrollbars, etc. to allow me to navigate the loaded image. I would like to have it load the image, initially, to fit within the dimensions of PictureBox1 and from there be able to zoom in/out via my "Zoom In/Out" and "Actual Size" buttons and be able to scroll if the zoom level is beyond the dimensions of PictureBox1.
(3) It dawned on me that I haven't the faintest idea how to get my "Next/Previous" buttons to allow the user (me) to navigate, in succession, the images contained in the folder in which the currently loaded image is stored. [code]
If it is deemed that this thread is inappropriately requesting help, I ask that it be locked/deleted quickly as I recognize that this is a large community with many discussions going without need of unwelcome posts.
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Jan 19, 2012
I'm using loop to read data from sql and then make some calculations then save it again to another table but when application loop for 3 or 4 times it's freeze but the job is done but if loop = 10 or more then it is freeze and hangup for long time .i need to learn how to make my application working better and never freeze and make application working with any count for loop without freeze .
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Jul 14, 2010
I can't understand why this is not working.
[code]...
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Mar 28, 2009
I am moving over to vb.NET and am experiencing the learning curve. Am learning quickly, but I do have a question for anyone who can respond. vb6 could be made to run much faster by going after the GDI API directly, rather than going through vb6's standard wrapped functions like Line(), and Circle(). Now that I am working with vb.NET and GDI+, as far as I can tell there is no wrapper anymore and you hit GDI+ directly "right out of the box". Is this true? It looks like trying to phenagle the old vb6 API code can't work because .NET does not use GDI anymore...it uses GDI+ via the System.Drawing namespace.
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May 19, 2012
I'm developing application using RS485.
Which is working fine when i debug from project itself but when i run after building .exe it is not getting any reply back.
After some try and error i found that RTS(Request to Send) is the reason behind this problem.
Port.RtsEnable = True
Port.Write(DATA)
Port.RtsEnable = False
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Jul 31, 2010
I added FileSystemWatcher in Form1_Load like this -
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
....................
[code]....
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Apr 26, 2010
I can't figure out why my addhandler is not firing?In the Sub "CreateTagStyle" the AddHandler is not firing when the LinkButton is clicked Is there some reason that addhandlers can't be added at certain points of the page lifecycle?
<%@ Page Title="" Language="VB" MasterPageFile="~/_Common/Admin.master" %>
<script runat="server">
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
[code]....
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Oct 4, 2011
I am using the CustomValidator for the first time but it doesn't seem to be firing DateExpireRequired_ServerValidate and just runs the code in the Click action.Been bugging me for a couple hours now! can anyone see a problem with what im doing?The DropDownList in my code below is populated using Roles.GetAllRoles()
ASP.NET
<asp:Label ID="lUserRole" runat="server" AssociatedControlID="tUserRole">User Role:</asp:Label>
<asp:DropDownList ID="tUserRole" runat="server" CausesValidation="True">
</asp:DropDownList>
[code]....
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Apr 6, 2010
I'm trying to get get the short filename from a long filename but I'm having problem in c# code. VB.Net code is:
Declare Function GetShortPathName Lib "kernel32" _
Alias "GetShortPathNameA" (ByVal lpszLongPath As String, _
ByVal lpszShortPath As String, ByVal cchBuffer As Long) As Long
[Code]....
But I cant get the c# version work. Am I missing something or what is wrong?
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