I have a .dll provided by a vendor and it requires me to pass a handle to the com port the device is represented as in order to access some other functions. Can I get the handle from the SerialPort object? The device I'm working with is a USB-UART converter chip with auxiliary I/O. I need to access the I/O which involves using a Visual C++ 6.0 .dll which is the one that requires the handle to the Com port.
View 2 RepliesI am following some instructions that apparently work with vb6, but as i have downloaded the lastest version of visual studio i think its up to version 10.
The code i am trying to make work is,[code..]
I searched a bit for an equivalent.
I am following some instructions that apparently work with vb6, but as i have downloaded the lastest version of visual studio i think its up to version 10.[code]The error is that hWnd is not a member of windowsapplication1.form1.
View 3 RepliesI am trying to run the function:
Code:
Private Sub port_dataReceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles port.DataReceived
from inside a while loop of a different function ie.
Code:
While A_switch = 0
System.Threading.Thread.Sleep(100) ' Sleep for .1 second
calabrate_send = calabrate_send - 5
[code]....
the real problem is that the serial call updates the value of A_switch which is need to exit the loop at the correct time?
I am writing VB.NET codes in both Window form and DLL.
In the Window form program, no problem I have. She can open serial ports, write, and handle receive interruption with the code below[code]...
I develop a simple application usiing VB.NET, VisualStudio 2008, that read input from a serial port
(from another device). I use the class SerialPort.
Using HyperTerminal I can see the input , it's fine. looks like :
S0P,A,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0 S0P,A,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
[Code]...
I am having a little trouble with the serialport object in VB2008. I have a program that will send a command to the slave device however the program will not read the data from the slave device. I know my computer is communicating with the slave device because in hypertem it has no problem. For example I send the word "AT" and I should get back a response of "OK",
View 9 RepliesI know how to handle a single objects property changed event very easily. I want to handle a objects property changed event that is part of another object.
Given Object:
[ObjectY = Y]
+ Public WithEvents X As ObjectX
I would like to do something like:
Private Sub XPropertyChanged() Handles Y.X.PropertyChanged
Right now I need to create a object that equals the object inside that object and then handle this variable pointers property changed, but that is just annoying.
Is there any way to get reference of an object by its handle that obtained through FindWindowEx API?
this object is a user control written in .net.
Is it possible to handle a property as an object?I want to reach a property as an object , not through its owner.
Dim prop as object = UNKNOWN_FUNC(btnTest.Text)
prop = "New text of btnText.Text" '
I want to modify Text property of btnTest by this way..
Is there any way to run code when COM object is about to be disconnected from RCW without implementing IDisposale interface and explicit call MyObject.Dispose in client code?
The code below is not working. When program enters Finalize sub, ExcelApplication is already disconnected from RCW, and I get error. I understand why it happens, but I want to get a solution.
I want to make it working the following way: when last managed reference is released, code from Finalize sub is executed before COM object is disconnected.
My question is - is it possible at all and if it is then how can I handle this event inside the class, without need to call Finalize explicitly from outside?
Very simple class:
Public Class ExcelRunner
Dim ExcelApplication As Excel.Application
Public Sub New()
[Code]....
how I can convert an Integer of an object handle to an IntPtr?
View 2 RepliesI have a piece of vb.net code that finds the nunit.exe process like thisDim proc2 As EnvDTE80.Process2 = dbg2.GetProcesses(trans, "myPC").Item("nunit.exe")now I'd like to press a button on the window of that process so I do thisDim ButtonHandle As IntPtr = FindWindowEx(X, 0, "Button", "Run")SendMessage(ButtonHandle, &HF5, 0, 0)
View 1 RepliesIs this class normally slow or maybe there is something in my process making it slow.I have to import 170,000 rows of data from a fixed length text file into a SQL table. It takes about 2 minutes in a DTS package on SQL server 2000. But we are migrating to a SQL 2008 server and since this code has several manual steps and does not manipulate the data I thought it would be easier to use the TextFieldParser object to handle reading in the data.
Here is the code:
CODE:
Say I have a button that creates more buttons with a random .Text property, and placed them on the form in different locations. And since these buttons are being created at runtime, I want to be able to have an event handler for all button controls on the form that makes the form's text the same as the sender's text.
View 3 RepliesI have just loaded an access 10.0 database into my VB project as a dataset.Two of the tables contain an Ole object field and an attachment field (the data in the fields are described by the field types). All of the data contained in either of these field types, when observed in the dataset, show a warning and indicate that it is unable to display that data. As might be expected, when the data is called in a gridview, anything from those fields throws errors.
I would like to know if there are any known issues with these types of fields and VB, and if so what might be done to resolve that.
I've been thinking about my options when it comes to events in vb.net.What I'd like to do is to track events that are fired in an application without explicitly declaring them with 'handles' sub. Here is a pseudo-[code]....
Yeah I know, not quite working, but is there any way of implementing something like this in vb.net? My end game is really to be able to monitor events fired in many objects from another object, isn't there a more maintainable way to do that then to add a special sub in each object that handles the event that I want to catch? I need some way to let one object handle events fired in other objects without a special sub, the AddHandler goes a long way, but I can't really use that dynamically like so:[code]....
I want to use One routine to handle multiple events & i want to give the list class object to the routine handle clause in vb.net. Is it possible? I have 100 buttons on my web page & i want to handle click event of each button. I have same coding on each button but the only difference is that, which button is calling the event handling routine. So i want to make one sub routine for handling event of all my buttons.
I can solve this by writing each button name in the handles clause like - Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ImgRCP_26.Click, ImgRCP_27.Click,. But it is so lengthy procedure. So that why i want to handle my button in the arraylist. How to do this?
I have an RDLC report that I am rendering directly to the Response Stream as PDF (rather than using the ReportViewer). In the code that renders the report, it's DataSource is bound to a List(Of ClassA) objects defined in a custom assembly. This seems to work for the most part. My problem is that I can't seem to handle the situation where a nested object is null. For example, given ClassA and ClassB (the nested object) defined as follows:
Public Class ClassA
Public Id As Integer
Public Name As String
[Code]....
the report displays "#Error" if TheNestedObject is null. If TheNestedObject is not null, it correctly displays the Name.
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?
I'm trying to obtain data from a dll, but I do not know how to do it.My code is:
'Function
Public Declare Function SET_XML_PATH Lib "EbmPapstFan.dll" (ByRef ruta As String) As Long
Public Declare Function GET_PRODUCTS Lib "EbmPapstFan.dll" (ByRef ruta As String) As Long
[code]....
This isn't a mistake with the path because Int_A is 0. In addition, GET_PRODUCTS gives me the number of products that software has.The manual say that this function also has string character output.I don't know how obtain this other string character output.
How can I obtain the first row value. ex.
Table
ID NAME AGE
1 peter 14
2 Jogn 13
3 Luke 6
If i click peter I will get 1.I can get the clicked value but I do not know how to get the first item in the selected row.
I am trying to read caller id from a internal modem. modem is caller id enable and it works in hyper terminal. but when i try from vb.net it only shows 'RING'. here is my full code
[Code]...
I am using VB 2005 and need to trap a serial port timeout. I use a standard try/catch block, but if no characters arrive the code still hangs at the ReadByte call. Here is the code:
Try
SerialPort.ReadTimeout = 200
' read timeout of 200 mSecs
thisByte = SerialPort.ReadByte()
[code]....
Recently while trying to help someone with an issue using USB SerialPort's I discovered sometheing interesting when the ports Handshake was set to RequestToSend. My setup COMx <---> BreakOutBox <---> COMy COMx and COMy are on the same PC. The breakout box is used to create a null modem, pins 2 & 3 crossed, pin 20 to pin 6.When the handshake was set to RequestToSend every Write resulted in Carrier Detect and Ring being raised. Is this just my adapter or are all USB SerialPorts like this?Serial Port Random Microsoft® Community Contributor 2011
View 2 RepliesI have wrote this program (for PDA), to connect a PDA to the PC via RS232.It only works half way.
If I send anything from the pda to the pc, I receive data correctly.If I send anything from the pc, then the pda hangs up.Can anybody tell me what I'm doing wrong?
Also, how do I make sure the port on PDA is closed when quitting the application?
[Code]...
my problem is that is have to create a program in which I enter some text in a text box and then in an other text box it will display the value store in a selected byte. I really don't know where to start. I have a form with three text box and a button. One of the text box to copy o write whatever I want, the other text box to write the number the byte I want to get the value and the last text box to display the value stored in the byte I choose. With the button I will start the function that will get me the value in the byte.
View 6 RepliesI have a general idea of what the code should look like but I can't seem to finish/put it together.I have a year's worth of data such as December 01, 2010 to December 01, 2011.The problem is that there are more than 365 points, some days for example have 3 data points and others have 4, etc..What I would like is to only have 365 points of data by averaging the data points for the days that have multiple points.
[Code]...
- So far I have another column with dates from Dec 1st 2010 to Dec 1st 2011.
- I think I'll need an IF statement for if the whole range of A column equals one of 365 days, it'll equal the average data.
- then I'll need to have a statement for x+1 date for each consequtive day.
[code]...
Is there any trick that could give me the first word of the str [code]...
Say I have a rolling collection of values where I specify the size of the collection and any time a new value is added, any old values beyond this specified size are dropped off.Obviously (and I've tested this) the best type of collection to use for this behavior is a Queue:
myQueue.Enqueue(newValue)
If myQueue.Count > specifiedSize Then myQueue.Dequeue()
[code].....