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]....
I developed a little app which uses SendMessage function to turn off monitor. My friend asked me whether using the app regularly will harm his monitor. He had some issues with his mother board when he used a similar app. Is there any harm (for hardware) in using the function to do things like these?
View 1 RepliesI am developing an application that inserts text into another application. No problems at all finding handles and using SendMessage to insert text into their standard edit boxes/combo boxes/etc.My problem is that when I attempt to insert text into what appears to be a masked
text
box
(e.g. a date into a box with the format __/__/____), it does so...but the application does not recognize it as valid data.How to I format my string/SendMessage to match the mask in the text box?
Private Declare Function CascadeWindowsNative Lib "user32" Alias "CascadeWindows" ( _
ByVal hwndParent As Long, _
ByVal wHow As Long, _
ByVal lpRect As Long, _
ByVal cKids As Long, _
ByVal lpkids As Long) As Integer
calling:CascadeWindowsNative(Nothing, &H4, 0, 0, 0)
I have created a webcam application in vb2010, when I run the app I get a run time error, please see below PInvokeStackImbalance was detected Message: A call to PInvoke function 'WebCam!WindowsApplication1.WebCamMainForm::SendMessage' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature.
it is coming up on this block of code'This sub will open the preview window
Private Sub OpenPrewiewWindow()
Dim iHeight As Integer = WebCamPictureBox.Height
Dim iWidth As Integer = WebCamPictureBox.Width
[code]....
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.
Get the current number of usage days, unique usage days, etc in an evaluation license using CryptoLicensing Generator.
View 1 RepliesCODE:
Whats wrong with this code? There is no error. But nothing happens when exicuted.
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View 8 RepliesI'm trying to send some words to an application I'm running (exe file, no webpage). To do this I run my vb program and minimize it, so that the application I want to send the words to have focus.Now I've tried sendkeys, but it seems sendkeys only sends my first word and does nothing with the other words. The code below is called 4 times by the main form
If i > 3 Then i = 0
i = i + 1
If i = 1 Then verhaal ="some text 1"[code]....
but this throws in a overflowexception was unhandled error at the apiSendMessage(hWnd, WM_SETTEXT, 0, "Hello") line.I've tried several things but I can't figure it out how to send multiple words to the application without problems .
I am using SendMessageTimeout to send messages (IPC) to talk between applications ... works fine in vb... but i am trying to build a vb.net implementation to talk between existing vb6 apps and .net ones...
So far i can successfully send data from vb.net to vb6 using:
vb
Dim b = System.Text.UnicodeEncoding.ASCII.GetBytes(Command)
Dim Data As New COPYDATASTRUCT
Data.dwData = New IntPtr
Data.cdData = UBound(b) + 1
[Code]...
Do you know which website that free download ebooks on API VB.net? I'm a second grad on IT programmer.
View 2 RepliesI 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]....
I would like to get the x, y position from the Params when the WM_LBUTTONDOWN is sent in vb.net.I got this to make the param but how do I get the position from it.
IntPtr lParam = (IntPtr)((y << 16) | x);
My function:
Protected Overrides Sub WndProc(ByRef m As Message)
Select Case m.Msg
Case WM_LBUTTONDOWN
[code]....
Update: I just tried this and it works perfectly.
Dim pos As New System.Drawing.Point(CInt(m.LParam))
Private Const WM_KEYDOWN = &H100
Private Const WM_KEYUP = &H101
Private Const VK_BACKSPACE = &H8
[code].....
I have this code:
Private Const MOUSEEVENTF_LEFTDOWN = &H2
Private Const MOUSEEVENTF_LEFTUP = &H4
Dim WindowHandle As Long = FindWindow(vbNullString, "Ultima Online")
SendMessage(WindowHandle, MOUSEEVENTF_LEFTDOWN, 0, 0)
SendMessage(WindowHandle, MOUSEEVENTF_LEFTUP, 0, 0)
I know it is getting the windowhandle fine, because I made a conditional statment that pops up a messagebox if windowhandle = 0 The problem is that it is not sending the mouse click to the window.
[URL]
Damned. Is there a managed code somewhere in vb.net where mortals can simulate key presses?
Is there an e-book or book somewhere about it?
I am trying to write a small plugin for eventghost for one of my software (audio player). EventGhost can send SendMessage or PostMessage messages to control other apps. How can I receive such messages in a VB.NET app?
View 1 RepliesIve been trying to figure out how to sendmessage VK_Space. i found an example and just tried it how it was, but i always get an error.My code
Public Class Form1
Private Declare Function PostMessage Lib "user32" Alias "PostMessageA" (ByVal hwnd As IntPtr, ByVal wMsg As IntPtr, ByVal wParam As Long, ByVal lParam As IntPtr) As IntPtr
[code].....
bear in mind i am pretty new to thisnow "Ultima Online" is the title of the window/game im trying to send a simple mouseclick to..
View 2 RepliesI use keybd_event and mouse_event to simulate keypresses. I want taht to still work when the user is switch (Xp supports several users as we know).
Well, it doesn't.
I've heard sendmessage is more reliable,.
I manage to simulate click easily.
SimulateClick2 = SendMessage(hwnd, BM_CLICK, 0, 0)
Now, how to do so to simulate keypresses?
Can anyone give me a SendMessage/PostMessage Example? I want to make SendMessage/PostMessage work like SendKeys, except instead of sending keys to the app in focus, it will send keys to a certain app. I've looked at a lot of examples that use notepad, but they all need to use "find" the "EDIT" thing. I dont want that. Is there any other way?
View 3 RepliesI can't seem to get my program to send anything to this text box. I am able to receive the handles of each object, but never able to send to it.
Here is my code.
vb.net
Public Const WM_SETTEXT = &HC
Public Const WM_KEYDOWN = &H100
[code]....
It wont even set focus.I have the right amount of tiers ... perhaps im in need of the use of GetControl?
I am Automating IBM iSeries Emulators using VB.net, created GUI that embeds the external iSeries Emulator Window in a WindowsForm Panel using the "SetParent" API .. To communicate with the iSeries Window I use the SendMessage API to send Key's to the Screen. I am aware of the sendkeys.keys in .net, but this way I dont have to SetForegroundWindow and reactivate my Form.
[Code]...
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.
View 11 RepliesAlright 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
View 2 RepliesWe 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?
View 3 RepliesI am launching an external that brings up a window that is split into two frames. I am able to get the handle of the frame and what I want to do is click inside the frame in a certain area.
For example, if I open "System Information" by launching msinfo32.exe, how would I click on Internet Settings in the left window pane? I don't need the exact coordinates, just an explanation of how it can be done using SendMessage or PostMessage.
I've tried things like:
PostMessage(sideWnd, WM_LBUTTONDOWN, 200, 1200)
PostMessage(sideWnd, WM_LBUTTONUP, 200, 1200)
I wasn't sure if the end two numbers would be coordinates, but if they are, I've tried different numbers and can't seem to get it to click anything other than the first item in the list of the left window frame.
I need an API for sendmessage and sendmessagetimeout for my VB .net application. I have searched quite a bit, and everything I find doesn't seem to work: either the message just doesnt seem to be sent, or the message appears to be sent with the msg parameter always 0, and the wparam setting as what I enter for the msg setting. Pinvoke's also always seems to throw an AccessViolationException for I have no idea what reason. I tried playing around with maybe just where I put the variable, but unsurprisingly, there is not a simple logical switch of the variables.I have tried pinvoke's:
<DllImport("user32.dll", SetLastError:=True)> _
Public Shared Function SendMessageTimeout(ByVal windowHandle As IntPtr, ByVal Msg As Integer, ByVal wParam As IntPtr, ByVal lParam As IntPtr, ByVal flags As
[code].....
I am currently writing a program that must extract data from the screen of another application. This application is a client side database interface. When the client retrieves data from the database it is displayed on this form. I am currently using.
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