Getting Handle Using Win32 Api?
Jan 24, 2012
I am trying to create a small utility that tracks desktop usage in detail, to the level of individual text boxes etc.... in other applications. However, it is proving quite tricky. I thought I had it nailed using the Windows api. The below code is just a snipet of the code but essentially it provides me the handle of the control that the mouse is over. I thought from here, it would be easy to to the same thing but to provide the handle of the control that the cursor was actually clicked on, for example, if someone is filling in a text box in an application, they would not necessarily move the mouse to get to the text box, they may tab to it. Does anyone know if there is a way to get the handle of the control that is in use?
Private Sub Timer1_Tick(sender As Object, e As System.EventArgs) Handles Timer1.Tick
Dim ptx As Integer = Cursor.Position.X
Dim pty As Integer = Cursor.Position.Y
[code]....
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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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Apr 18, 2012
I was scripting a very basic process manager, with a ListView component, and it was working fine for many days, up until now.Here is the code for getting processes:
Dim Process As New Process()
Dim Count As Integer = 0
ListView1.Items.Clear()[code].....
The line of code where I put "*WIN32 EXCEPTION LINE* keeps running into an error(Win32 Exception was unhandled; Access is denied). Here is the full error description:
System.ComponentModel.Win32Exception was unhandled
ErrorCode=-2147467259
Message=Access is denied[code]....
As I said before, this had been working for several days, up until now.
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Sep 15, 2009
Do you know which website that free download ebooks on API VB.net? I'm a second grad on IT programmer.
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Mar 23, 2009
I wrote an application to handle a joystick with directinput. It works fine if it uses the handle of the main window but it doesnt happen the same if the handle is the one of the component that contains the joystick's operation.
I mean:
main form handle: 15
component handle (which is inside the window and the joystick needs the focus of this component to work): 25
It always work if the handle i initilizate the device is the main form (15).How can i use only the handle of the component?
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Feb 29, 2012
Does anyone know of a good 3rd party reference for Win32 API for .Net where VB.Net is the target language Most API references target C as the language of choice. Frankly, I hate C and all C like languages.
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Aug 20, 2009
Alright today im going to make a chat program in C++ and VB.net VB.net will be the server and C++ will be the chat room. Im doing this becuase some people dont have .net and the program fails so im trying this so then everyone can use it. How would i do this? Like C++ sending information to VB.net and printing it out on a textbox
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May 28, 2010
We have a .NET app that needs to examine a folder that may contain COM libraries (DLL and OCX.) When we do encounter a COM library one thing we need to accomplish is to extract the GUID from the COM DLL or OCX.Is there a straightforward way to do this with .NET without using 3rd party libraries?
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May 7, 2009
I read in msdn that registrykey class is found in Microsoft.win32 namespace.But when I try to add a reference to my project, I couldn't find Microsoft.win32 in the list.
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Oct 1, 2009
I have installed VB6 and Visual studio 2005. when i am opening the VB6 files getting this error.
Visual Studio Just in time debugger
An unhandled win32 exception occurred in VB6.EXE
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Jan 5, 2011
Long story short, code that used to work on my 32 bit computer doesn't work on my 64 bit computer. Does 64 bit require something like changing Integers -> IntPtrs?
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Sep 23, 2011
I have a Delphi program that communicates with a vb.net dll that I created. The vb.net dll communicates with a Fluke scope meter via an RS232 connection. I have created a program that communicates correctly via RS232, giving me the anticipated value. Though, when I package this up as a dll and access the dll from my Delphi program I always receive a value of "1", rather than the value I was expecting (most cases a value in and around 240).I know that my delphi program is definitely communicating correctly with the dll and that my dll is definitely communicating with the scope meter
Here is my vb.net code:
Public Interface IFlukeComm
Function GetReading(ByVal Command As String, ByVal PortNum As Integer) As String
[code].....
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Mar 11, 2011
I am trying to extract icons to use them in a listview. I have use similar code in VB6 but in Dot Net I am getting an error, eventhough the icons are loaded. "An unhandled exception of type 'System.ExecutionEngineException' occurred in System.Windows.Forms.dll"
I am not sure what is the correct way making this work in windows forms. Please any help is greatly appreciated. here is the code I am using to load the smallicons imagelist of a listview.
Imports System.Windows.Forms
Imports System.Drawing
Module ExtractFileIcons
[code]....
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Sep 16, 2011
A DLL file contains some images inside PNG resource type.
I can view the PNG images in softwares like Resource Hacker, Anolis Resourcer & Resource Tuner. Check this screenshot of Anolis Resourcer for more details:
how do I get the PNG image no. 5220 from the DLL file and put it inside a PictureBox? I don't think APIs like LoadImage or LoadBitmap will work.
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Aug 1, 2011
I have a requirement of changing the cursor from normal arrow to hourglass in my application. I am using the SetSystemCursor Win32 API to do so. But, it does not seem to be behaving correctly. Below is the sample code that I developed to demonstrate the problem -
Imports System.Runtime.InteropServices
Module Module1
Sub Main()
[code]....
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Jan 20, 2011
I want to retrieve all the files on the local machine to take a look at their attributes.I tried it with io.directory as: [code]From their I need the logics to retrieve the list again and again to get all the directories on the machine, to check later on for their files. [code]The problem is, that I only got file information from my startup path of the application, but I want to retrieve all files on the local machine.
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Aug 21, 2011
I have this window with hwnd = 132240. I am trying to use WIN32 API's SendMessage function to send a WM_SETEXT message to the window.Code that I have written
Const wm_settext As Long = &HC
'sendmessage(66824
Dim rc As Long
[code]....
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Nov 25, 2010
How do I use DeviceIoControl Win32 API and the IOCTL in VB oder C#/C+/C++ to power down a USB port?
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May 14, 2009
I'm running into is some of the namespaces aren't being recognized. After searching the internet it seems I am supposed to have more than just System.Management.Instrumentation available to Import/Reference.However, that is all I can access.I need System. Management. ConnectionOptions and a few others, but don't know how to get these.Do I need to install the WMI SDK, or maybe the WMI Win32 Classes?
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Jun 12, 2009
I need to develop a voice recorder application using Win32 Waveform Audio API interface in C# or VB.NET ..
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Aug 27, 2010
Win32 resoruces updating , modification is quite toughest task there are very few tutorials.I am aiming to start a committe group for providing proper documentation of resource updating deleting etc
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Jan 9, 2009
I would like to mix C++ Win32 DLL with VB in the same solution such as: [URL] It's just that I would like to reference the DLL with VB. In the example above:
[Code]...
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Jul 24, 2010
Is there a .net namespace or similar/simpler way to get text from windows and child classes (controls) other than using a Win32 API messages?I think there is a way to get the handle of the active window in .net without WinAPI. Anyone know what namespace/class does that?
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May 20, 2010
Iam using GetKeyboardState API in my application for getting keyboard state . it was working fine for win32 applicati9on. When I moved to 64 bit application gets crahes without popping any exception message.my sample code is as given below:
Private Declare Sub keybd_event Lib "user32" (ByVal bVk As Byte, ByVal bScan As Byte, ByVal dwFlags As Integer, ByVal dwExtraInfo As Integer)
Private Declare Function GetKeyboardState Lib "user32" (ByRef pbKeyState As Byte) As Integer
[code].....
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Jun 19, 2012
I'm trying to convert some VB.net code into C# and having issues trying to convert this one line. VB.NET Dim myreg As Microsoft.Win32.Registry I know it's a static so I can't create an instance but when I tried a VB.NET converter to C# the website gives me this: Microsoft.Win32.Registry myreg = null; And gives me an error message: 'Microsoft.Win32.Registry' is a 'type' but is used like a 'variable' In the last part of the Function in VB.NET, myreg is used:
[Code]...
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Mar 12, 2010
I am refactoring a large and complicated code base in .NET that makes heavy use of P/Invoke to Win32 APIs. The structure of the project is not the greatest and I am finding DllImport statements all over the place, very often duplicated for the same function, and also declared in a variety of ways:The import directives and methods are sometimes declared as public, sometimes private, sometimes as static and sometimes as instance methods. My worry is that refactoring may have unintended consequences but this might be unavoidable.
My instict is to organize a static/shared Win32 P/Invoke API class that lists all of these methods and associated constants in one file... EDIT There are over 70 imports to the user32 DLL.(The code base is made up of over 20 projects with a lot of windows message passing and cross-thread calls. It's also a VB.NET project upgraded from VB6 if that makes a difference.)
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Aug 30, 2010
I try to change some printer settings using the win32 api OpenPrinter,GetPrinter and SetPrinter in VB.Net application.I copied most of the code from this or related newsgroups. However, OpenPrinter, GetPrinter and ClosePrinter works so far but I cannot change the printer settings. SetPrinter returns the error code ACCESS DENIED. I know I have to deal with the desired access mask in the _DEFAULT_PRINTER structure when calling OpenPrinter. Unfortunaltely the declaration of the DEFAULT_PRINTER structure or class I found on the internet doesn't work with the OpenPrinter function.
Public Structure DEVMODE
Public dmDeviceName As String
Dim dmSpecVersion As Short[code]]..........
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Jun 9, 2010
I am using Microsoft Visual Basic 2008 Express Edition on an Acer Aspire 3810T running 64bit Windows Vista Home Premium (Intel GMA 4500). No matter what Code I write concerning DirectX, I get a White Form with a huge Red X when I run the PROGRAM. I also get the error: not a valid Win32 Application. This is the last Code I used:
[Code]...
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Oct 7, 2009
can anyone tell me if this option is available in VB.NET 05/08, I want to add Win32 resource file (.res) to project but i can't find any option to do that, and the option was in C#. This not a regular resource, it was created using native resources template. Below are the screenshots of Application tab in project property from C# and VB IDE. The option that im looking for is in red box on C# screenshot
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Apr 12, 2007
i'm writing an application where error messages are written into a text file.
text file is created using win32API createfile() function.
after that everytime an error occurs the message is written into the text file with writefile() API.
but whenever a new message is written the old text in the file is getting overwritten.
i want to append the new message at the end of the text already in the file.
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