I am creating a project with a maximized per-pixel alpha form. However, the normal input events (MouseDown, MouseWheel, KeyPress, etc) are never raised. I've been able to create some bare-bones functionality by overriding the WndProc method, but some things elude me. For example, I want to detect mouse wheel scrolling. When I check for the mouse wheel message, it works fine. Then I try to use the GetLParam function to get a MSLLMOUSESTRUCT with the scroll data. However, when I try to use it, I always get an error:"Attempted to read or write protected memory. This is often an indication that other memory is corrupt." What can I do?-Must Program! Error: Not enough time to program
I'm trying to create a program using Visual Basic .NET 2010 that alters the use of my media keys - Volume up, Volume down, Play, etc. All of the example I have found don't seem to compile quite correctly in 2010. Don't get me wrong they run fine and look exactly as specified but the problem is that the form cannot be edited because it claims the designer code is ill-formatted or something along the lines of that.
Can anybody possibly spare a project or form that has perpixel alpha transperancy?The only thing i want to do is show an overlayed png that has an alpha channel, on the desktop. The form border style will most certainly be "NoBorder"
I am going to blend two images together using multiply blending, and will iterate through all pixels. I have search in wikipedia that the calculation of multiply blending is:
resultRGB= src * dst / 255
but it didn't mention about alpha, how does alpha affect the result?
For y = 0 To fsrc.Height - 1 For x = 0 To fsrc.Width - 1 Dim d As Color = fdst.GetPixel(x, y) Dim da = d.A / 255, dr = d.R / 255, dg = d.G / 255, db = d.B / 255
I am writing a calculator app in VB Express 2008. I'm trying to get the app to accept numeric and operator input while ignoring all the alpha input. In other words taking input from the numeric keypad and the top of the keyboard and ignoring all the letters.
Here's the block of code I have so far:
Private Sub TextBox1_KeyDown(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles TextBox1.KeyDown If (e.KeyCode >= Keys.D0 OrElse e.KeyCode >= Keys.NumPad0) And (e.KeyCode <= Keys.D9 OrElse e.KeyCode <= Keys.NumPad9) Then Select Case e.KeyCode
[code]....
I can't get vb to recognize the above code it seems to skip right over it. BTW, is 'Keys.Crsel' the same as the caret '^' symbol?
I've been playing with VB.NET for a couple days now, and I was looking into key input controls, now I've managed to have it react to keyboard buttons being pushed inside the main form (wasn't hard), where it counts total amount of keys pushed, not what keys are pushed etc.
What I'm having a harder time is finding a way to have this same functionality even if the form isn't active (for example when minimized to the system tray). I did find a similar question on these boards, but it was regarding hotkeys and that user was just referenced to the hotkey API, which is not what I am aiming for.
I want to handle the events of my serial input buffer. I've seen the following article:
[URL]
My programming skills are not really that great so I've got a question:How can I trigger a sub (for example: ArduinoSerialInput) as soon as this event is handled?
Code:
Public Delegate Sub SerialDataReceivedEventHandler(ByVal sender As Object, ByVal e As SerialDataReceivedEventArgs) Dim SerialBufferIn As SerialDataReceivedEventHandler = AddressOf ArduinoSerialInput Public Sub ArduinoSerialInput() MsgBox("test") End Sub
I use a piece of hardware to send data to my COM port, but nothing happens.
I wish to use raw input on an application that i know accepts it and simulate ondevicearrival events for a physical hardware device so i dont have to plug it in to test on device arrival. I can find the pid and other hardware specific numbers if needed for the simulation but im really just wanting to simlulate multiple mice for ondevicearrival.
Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth. - "Sherlock holmes" "speak softly and carry a big stick" - theodore roosevelt.
I'm working on a project where I need a timeline similar to what you would see within a video editing program. Picture of my timeline - [URL]
So far, I've designed the timeline using nested pictureboxes. The main area of the timeline is a picturebox, and each track (marker and test) are children pictureboxes contained within the first. The marker dots are custom controls that are children of the marker picturebox. The idea will be for the slider to control zooming of the information in the timeline and the scrollbar to control panning of the timeline. Live data will be added to the timeline. This live data will include the marker dots and painting on the bitmap contained within the test picturebox.
I've got portions of the timeline functioning, but I'm stuck on how I should go about panning and zooming. I would like the timeline to update every second and advance the blue bar by 1 pixel every second. The problem starts when the blue line reaches the end of the timeline. Once the blue line reaches the end, I want everything on the timeline to start scrolling off the left side. What would be the best way to go about doing this and still be able to maintain the data written to the timeline? This could be a lot of data if the program runs for several hours.
I have googled high and low to find an answer to this but I must be searching wrong.I have an application which has a listview displaying some items that are stored in a SQL Compact database. I am using a second form to add new items to this list directly into the database.When the second form closes I want to call the sub in my first form to refresh the list from the database.
How can I get it to fire the form1 sub routine on the close event of form2
I would like to load a GIF file, and start with the first pixel and check to see if that pixel color is closer to Black, Red, Green or Yellow, then take what ever color it closest matched to and output that color as a number, 0, 1, 2 or 3. So just for a small example a 5x4 GIF would be converted to something like this: 0112223322220111332?
How do i determine the pixel width and pixel height of the largest image i can paint onto the graphics object of a printer while inside a printpage event?
I want to handle the events of my serial input buffer. [code] My programming skills are not really that great so I've got a question:How can I trigger a sub (for example: ArduinoSerialInput) as soon as this event is handled? I've tried some code but without success, that's why I decided to post on the forum [code] I use a piece of hardware to send data to my COM port, but nothing happens.
I currently have a working program that creates one colored pixel in a Bitmap, displays the bitmap in a pictureBox, and "jiggles" the pixel by making it move in a random direction by 1 pixel every time a button is clicked. I want to make the pixel move automatically until a Stop button is pressed.
I'm using VB 2010 and need to multiply 2 user input numbers in forms, so basically: TextBox5 = TextBox2 * TextBox3 That obviously didn't work but it shows what I want it to do.
during the development of my project, i've fall in the need to change the position of some forms, pixel by pixel using a timer.Now, i've checked that the movement is very fluid when form is not very heavy, when it contains few elements, but when it has a lot of elements inside, the movement becames nervous and not fluid, the movement becomes jerky.
How can I find out the pixel colour of a certain point on a web browser. For instance,WebBrowser1.getPixelColor(0,0) would get the rgb colour value of pixel 0, 0.It doesn't have to be rgb it might be hsl or whatever.The web browser is showing a local web page that is hosted on a network. If there is an error then the screen goes all grey. What I want to do is, if this does happen, display an alert message like - "An error has occurred
I have an empty picture box with the background colour set to the transparancy colour. How can i get the colour of the pixels within the transparant picture box so that i can create a bitmap of the transparant section of the form?
i am using an unbound datagridview so i can dynamiclly add rows. all that is working fine. but the grid is not is the location i have coded.. i am using the defualt form as a base then coding the unbound stuff in.. should i just create a blank class file and do everything? the only problem i am having is the grid must bees in the correct location according to the pixel point that i have given it. Right now it is placing the grid at point (0,0) no matter what point is entered on the line for location. so what am i missing??????
I am bringing back here the subject of the communication between forms. The reason for this is that in a recent discussion in this forum it was conclude that using the events for communication between forms was a good practice. In a first time, I want to say, and everybody should agree with this that no form should never access directly any value or control values that belong to another form. There are many reasons for this but the principal one can be seen in this example
IN FORM1: TextBox1.Text="CrazyPennie" Dim MyNane as string = Textbox1.text With this code, Form1 will expect "MyName" to have the value "CrazyPennie".
But, if Form2 does access the directly the controls of Form1, it is possible for the value of MyName to be set to something else since Form2 can have changed the value of TextBox1.Text before the assignment by Form1 to MyName. Now, what is wrong about using the events for the communication? The problem is that an event is broadcasted throughout the entire application, so the conversations in between two forms are not private.
Look at this scenario: You have 3 forms in an application that communicate with each other with events. It is then possible for Form3 to listen to a communication between Form1 and Form2. It is also possible for Form3 to make the error to believe that the message send by Form1 to Form2 was address to itself. In this case, Form3, following this message may take some action that should not have been done and that result in some undesirable repercussion throughout the application.
This code keep the communication in between 2 forms private so no other forms or class in the application can listen at it and accidentally take an undesirable action due to a mistake. Option Strict On Public Class Form1 Delegate Sub MessageDelegate(ByVal sender As Object, ByVal Message As String) Dim Form2 As New Frm2 Private Sub Form1_Load(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles MyBase.Load [Code] .....
I have a form set up that allows the user to do many things to manipulate items. One of the things they can do is replace an item with another. To do so, what I have them do is click the Replace button on the main form. This calls the show of a choose replacement form where there is a grid view containing the replacement options and a Replace and Cancel button. When the user selects a product from the grid, and clicks the replace button, I want the item's ID to be sent back to the main form to be used in the replacement sub.This is what I have:
I have a tabbed webbrowser I want to add an event to it to make it so IE doesn't pop up when I click a link, with a normal webrowser that is easy but I guess I have to do a handler with the tabs being part of the browser and all. I have little experience with handlers. [Code]
I declared a browser in my VB.NET project (Dim browse as new WebBrowser). How am I supposed to get to the events (browse_NewWindow) of the declared thing?Oh yeah, my code for my browser is CType(TabControl1.SelectedTab.WebBrowser(1))
How can i code my application so that it can handle two sets of key events at the same time? For example, if I was making a game where one player used the WASD, and the other the arrow keys for moving, how can i make it so that both can move at the same time? The code I used only allows one to move at a time.. (key press event, If e.KeyData = Windows.Forms.Keys.down then.... etc)
i'm making a astoroids clone and i use pointF to store units position, but they lost y value on events like form.losefocus(i think)Is there any ways to prevent this?
I have a form with 2 contols that I with to connect by drawing a "wire" on the screen. It goes like this: you mouse down on the first control then move the mouse while holding the mouse button down. When the mouse is over the 2nd control the mouse button is released and the controls are wired.
So I am playing with mouseup, down, move, etc. When the mouse is over the first control I get mouse moves from that control, but when it moves off the events stop, and I get no events from the form even though the mouse is there.
Is there a way to do this? I have seen it done in a Java app. I could brute force it and just draw a box on the form instead of a control, but that sounds like a step back.
I have form 1 which will raise an event for form2 after doing some calculations. I know how to raise an event in form2 and then write the sub in form1 but i cannot do the reverse... how can I do this in reverse??? I cannot raise the event sub in form2 is not responding.
Example: Form1: Code: Public Class Form1 Event test() RaiseEvent test() [Code] .....
Is it possible to have multiple click events for a button based on the button text? In other words, if I change the button text can i create a new click event based on that text but use the same button?
for example:
button1.text starts as "steel" button2.text starts as "brass"
If I click button1 again a string would then be added to a textbox and the process would start over again. can I have a different click event or would I need to put an If/Then or Select/Case in the sub to handle this? I have 10 buttons I would need to do this with and each needing at least 3 different choices for each depending on the previous button press.
