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?
The following code will not set focus to the ie window that I need nor will it maximize it kike its supposed to
Option Explicit On
Public Class Form1
Public Declare Auto Function ShowWindow Lib "user32" (ByVal hwnd As Long, ByVal nCmdShow As Long) As Long
[Code].....
I am writing a simple code that will hide a window, or show a window if it has been hidden. I am using showwindow() to do so.
Private Declare Function ShowWindow Lib "user32.dll" (ByVal hWnd As IntPtr, ByVal nCmdShow As SHOW_WINDOW) As Boolean
<Flags()> Private Enum SHOW_WINDOW As Integer
SW_HIDE = 0[code].....
however the above will not bring/show the window that has been hidden.I assume showwindow works differently than how I expect to make it work? what is the proper way?
1. I have an array of windows handles (list of window handles) which are windows I want to minimize when I call the ShowWindow API. But when I call it it sometimes minimizes other windows which aren't the windows I had before. I'm guessing that window handles are changed when other windows are being opened, is there is any option to detect a window in other way? like identity or something like that?
2. I'm trying to change a window size by using the SetWindowPos, but the problem is that I'm using this API while I'm dragging a window which causes the window to change the size for a sec and then go back to the same size, how can I change the window size while I'm dragging it?
3. When a left mouse button is up I want to maximize a window, but when I'm using the ShowWindow API right after the left mose button is up it causes the window to maximize for a sec and then go back I could fix that adding a delay:[code...]
4. Another question, can anyone give me an example on how to put a window right behind other window? (I guess changing something in the Z order?) I already got the two windows handles.
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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View 9 RepliesIm 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....
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.
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.
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]
View 5 RepliesOk so i have this function at beginning:
[Code]...
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]....
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?
View 1 RepliesI 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?
View 1 Repliesi 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]....
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].....
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.
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]...