How To Use The Lib User32

Sep 21, 2010

I am working in VB.Net.Can some one provide me the documentation of Lib "User32". I want to know that Lib User32 is used for what purposes Or which functions it can perform?

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User32.dll SendMessageA Function

Sep 20, 2009

Im working on the Hyvar.NET project, and I've just started sandboxing browser tabs. Im using the sendmessage function of win32 to manipulate each tab, but i need to send things like Webbrowser.Navigate(URL) in the sendmessage function.

So far i have this:

<DllImport("user32.dll", SetLastError:=True, CharSet:=CharSet.Auto)> _
Public Shared Function SetParent(ByVal hWndChild As IntPtr, ByVal hWndNewParent As IntPtr) As IntPtr
End Function

[CODE]................

I somehow need to send the navigation methods etc using sendmessage....

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Get Size And Location Of Childwindow With User32?

Sep 5, 2009

If I know the hwnd of a window, could I get it's position and location based on my screen size. (I mean, size and location in pixels)

What I want to do is capture the screen, but only capture the handle's area.

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Capturing And Saving Video It With  Avicap32.dll And User32.dll?

Jun 15, 2009

I have a web cam  connected through USB,I capturing and saving video it with  avicap32.dll and user32.dll.But in the same time I need to starting other hardware and working with it trough COM port during capturing. And here appearing a problem, because then I send a command for start video capturing:

SendMessage(hWnd, WM_CAP_SEQUENCE, 0, 0) ' start video capture 

the executing code stops at this line until I click to stop to capture. But in the capturing time I need to work with my hardware, to obtain the data from it, and after that to stop capturing.To make to work simultaneous video capturing and my hardware or its impossible to do that with avicap32.dll and user32.dll.

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Difference Between These Two Declarations For PInvoking A User32.dll Function? 

Oct 15, 2011

What's the difference between these two declarations for PInvoking a user32.dll function?The first way, which I've commented out since it gets an error (Type DllImport is not defined"), the second way works. [code]

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GetProcessbyid() - Using User32.dll (Active Foreground Window)

Oct 3, 2011

Ok so i have this function at beginning:

[Code]...

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IDE :: WS_THICKFRAME (user32.dll) Doesn't Work With New Process

Jul 18, 2009

When I try to execute my code, the new process in my panel will act weird and crashes. That's my code:

'API Functions
Public Const GWL_STYLE As Long = (-16)
Public Const WM_SYSCOMMAND As Integer = 274
Public Const SC_MAXIMIZE As Integer = 61488

[code]....

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Retrieve The User32.dll Getlastinputtime From A System Service

Jun 9, 2011

I am trying to write a system service that can detect whether the user is active and then launch a process if not. I am using a service because I want this to work if the user is logged in or not. I have been trying to hook into the user32.dll API and retrieve the time since last user input. However the integer being returned is always 0 so I don't think it is working correctly. Is this not possible when running as a system service?

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Windows - Enable Control Of Another Application With User32

Sep 5, 2009

I was wondering if there was a function in user32 that could enable a hwnd control if it is disabled (grayed out) If I know the handle then can I do this? Also, if it is a menuitem, can it be done too?

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Unable To Find An Entry Point Named 'GetForegroundwindow' In DLL 'User32.dll'

Apr 22, 2010

i don't know why I got the error.

Code:
EntryPointNotFoundException was unhandled by user code

Code:
Private Declare Function SetForegroundwindow Lib "User32" (ByVal hwnd As IntPtr) As IntPtr
Private Declare Function GetForegroundwindow Lib "User32.dll" () As IntPtr
Private Declare Function SetActiveWindow Lib "user32" Alias "SetActiveWindow" (ByVal hwnd As Long) As Long

[code]....

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Read A Message Box Content Text Using The "user32.dll" Functions?

Apr 28, 2012

I need a simple win api inside c# / vb.net, to read a text out of a message box. I have a function to read a message box title, but i have no idea how to get the content text.The messagebox title function is:

' Function to retrieve the popup window associated with the form, as well as to
' find the child windows of the popup...
Private Declare Auto Function GetWindow Lib "user32.dll" ( _

[code].....

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Private Declare Function BlockInput Lib "user32" (ByVal FBlock As Long) As Long?

Dec 26, 2009

In Visual Studio 2008 I am using :Private Declare Function BlockInput Lib "user32" (ByVal fBlock As Long) As Long To stop input from occuring during a search-replace operation.

BlockInput(True) ' do not allow input during search and destroy
Dim cursorIcon As Cursor
cursorIcon = Cursor
Cursor.Current = Cursors.WaitCursor

Then setting it to false at the end of the operation. It did not work, so I thought maybe it was because I was calling it from a child window, so I created a function in the mainwindow, and ran it like this:

FrmMain.BlockFrmMainInput()With these functions is the Main window:

[Code]...

It did not solve the problem. I thought maybe it was because I was running under the debugger, so I tried compiling and running it debugger-free, but that did not do any better. I am still getting input when I double-click the mouse on either form.

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User32.dll + SendKeys - Windows 7 Vs Windows Xp

Jun 20, 2012

I have a small application I have developed to just put in some text into another applications input box, and it works perfectly!..... On windows 7. When I try to run the application the exact same way on windows xp the entire computer freezes for a little bit of time, then after it continues to run my application it doesn't insert any text to the applications textbox. I am not sure entierly what could cause this. Both are 32-bit and are running the same version of visual studio. Here is the code that I use. modApi.vb

[Code]...

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What Is "ShowWindow Lib "user32" " About

Jun 24, 2009

I was looking over some code that another developer wrote and found this:

Private Declare Function ShowWindow Lib "user32" (ByVal handle As IntPtr, ByVal nCmdShow As Integer) As Integer Private Declare Function SetForegroundWindow Lib "user32" (ByVal handle As IntPtr) As Integer

What does it do and what is it for?

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