I recently created a Class just for dynamically invoking API's and it works with system libraries (kernel32, user32, etc.) Here is the code:
NotInheritable Class DynamicAPI
#Region "API"
<Runtime.InteropServices.DllImport("kernel32.dll", SetLastError:=True)> Private Shared Function LoadLibrary(ByVal lpFileName As String) As IntPtr
[code]....
I have a function that I use quite a bit that I wrote more than 2 years ago. It works fine but recently I saw how it can use up a good deal of time under certain condition. Here's some code that uses the function SelectValue The function works so that if you had N which you plug into the function rising continuously while SelectLimit was set to 255 then SelectValue would match N until N reached 256. SelectValue would start to descend to 0 until it reached 0 and then it would again ascend to 255 and the process would repeat. So SelectValue(255, 255) would return 255 and SelectValue(256, 255) would return 254. SelectValue(257, 255) would return 253.
Option Strict On
Public Class Form1
Dim sw As Stopwatch
[code]....
The function works exactly as I want it to but if one of you knows a way to write this so that it will process faster then you can let me know. I get a result for processing time of 6.11 seconds on my computer for the above code.
The following code works great to interface *.dll that I built in Ada from VB.NET (2008) ...
Private Declare Function TestDelegate Lib "C:ABC.dll" Alias "Test" _
(ByVal A As Single, _
ByVal B As Integer, _
[code]....
... where TestType is a struct. The only problem I have with this is that the *.dll and its path has to be hard coded.
So I started looking at using LoadLibrary() and GetProcAddress(). I figured out the following interfaces ...
<DllImport("kernel32.dll", CharSet:=CharSet.Auto, SetLastError:=True)> _
Public Function LoadLibrary(<[In](), MarshalAs(UnmanagedType.LPTStr)> ByVal lpFileName As String) As IntPtr
End Function
[code]....
I check for IntPtr.Zero to make sure this all worked but now the question is how can I actually use the lFunctionHandle to call Test()?
I'm also curious what the difference is between the <DllImport("kernel32.dll" ... and something like Private Declare Function ABC Lib "kernel32" (...) As XYZ to interface a *.dll? whether it is necessary to call FreeLibrary() or whether VB will handle freeing up the memory?
I'm trying to get split to work.Here is my code
Public Sub CheckUpdate(ByVal FileURL As String)
Dim instance As WebClient = New WebClient
Dim ApplyTo As String = instance.DownloadString(FileURL)
asd = ApplyTo.Split(",")
End Sub
I use it like this
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
NewUpdate.CheckUpdate("version.txt")
Label1.Text = NewUpdate.asd(0)
End Sub
(yeah I know i use it on local txt for now!)So with asd(0) it reads the whole file. If i check asd(1) I get IndexOutOfRange . So how does Split() work?
I'm making a program that can mark my shooting cards and i have created it and it works nicely But i want to get as much speed out of it as possible so I switched my target CPU to X64 and sure enough my recursive function threw a Stack overflow exception telling me i need to make sure i don't have Infinity recursions. Strangely when I set It back to X86 the same recursive function works...
vb.net
Dim bullethole As New List(Of Point)
Function GetBulletHole(ByVal point As Point) As Point()
[Code]....
Updating the TextBox from a Thread that calls a function within a Class does not work. I'm trying to get this to work in a DLL (but I tried without as well). The DLL is accepting an Object as an argument[code]....
View 1 RepliesIn VB 2005 .Net is there a function that works like the php function "htmlentities"?
View 2 RepliesI am using vb to make a hospital system which works with a access database. i am having an issue with the updating function to the database, this time round instead of hard codding the connection i used the connection/data source wizard, in microsoft visual studio 2008 and there fore most of the code has been auto generated for me, which includes the insert, delete and update funtions from what i can find and what i have read vb is ment to also auto generate this which it is not. the funny thing is that i can close the program down and reload it (as long as i haven't opened the database) and my changes are still there but if i go and open the database and it hasn't changed. also i can change the database through the use of the Dataset connections in the datasource tab but not int he program the code ive found and believe that is meant to update the database
This is running off a couple of buttons i also have a update query but have know way of accessing it
Me.Validate()
Me.TblPatientDetailsBindingSource.EndEdit()
Me.TableAdapterManager.UpdateAll(Me.PatientInfoDataSet)
In VS2010 I'm encountering a PInvokeStackImbalance error when I call an unmanaged C function that takes a string argument. This only happens in VS2010 (works fine in earlier versions of vs). I know the MDA is more strict in VS2010 but I can't seem to figure out what the actual problem is.
[Code]...
Can I make an application that works on other OS's (e.g. Mac OS X, Linux)?
View 3 RepliesI have a code keypress that automatically input a text in a particular textbox if the text i pressed match the fields.eg. when I type 32 in the ID textbox . The name of the person whos ID is 32 will be put on the name text.it works perfectly but when I use autocomplete on the textbox it will not work anymore. is their a way or can anyone tell me why it isnt working.?eres the code for the keypress
Private Sub txtSubjectCode_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtSubjectCode.KeyPress
If e.KeyChar = Chr(Keys.Enter) And Me.txtSubjectCode.Text <> Nothing Then
[code].....
I have a code keypress that automatically input a text in a particular textbox if the text i pressed match the fields.eg. when I type 32 in the ID textbox . The name of the person whos ID is 32 will be put on the name text.it works perfectly but when I use autocomplete on the textbox it will not work anymore. is their a way or can anyone tell me why it isnt working.?
heres the code for the keypress
Private Sub txtSubjectCode_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtSubjectCode.KeyPress
If e.KeyChar = Chr(Keys.Enter) And Me.txtSubjectCode.Text <> Nothing Then
[code].....
make a search engine that works on isohunt ( This is a torrent site )Here what I need :A program to search in ( isohunt ) site View the results in a datagridview control Save the search results in any thing to load it at any time?
View 3 RepliesI have a code keypress that automatically input a text in a particular textbox if the text i pressed match the fields.eg. when I type 32 in the ID textbox . The name of the person whos ID is 32 will be put on the name text.it works perfectly but when I use autocomplete on the textbox it will not work anymore. is their a way or can anyone tell me why it isnt working.?
Private Sub txtTicketPassengerNo_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtTicketPassengerNo.KeyPress
If e.KeyChar = Chr(Keys.Enter) And Me.txtTicketPassengerNo.Text <> Nothing Then
[code].....
how do i make a program in visual studio 10 that works on older .net frameworks?
View 1 RepliesWhat is the best way to make a program that works with multiple versions of Microsoft office? I own office 2007, so my program uses the office 2007 com objects. When I try to use my application with office 2003, I get errors related to the com objects. Does Microsoft have com objects that are compatible with multiple versions of office?
View 2 Repliesi wanted to ask how to make picturebox1 ,to which functions are already assigned, perform the same function as picturebox2 ,to which no functions are assigned.For example:I have already made picturebox1 and have assigned it alot of function like when play button is pressed then picturebox1.visible = true and when we press pause button picturebox1.visible = false. So now i decided to make a theme and have to remove the picturebox1 and want to allow the picturebox2 to havefunction of picturebox1.But when i disable the theme the function of picturebox1 should go back to picturebox1.
View 6 RepliesCan I make a certian function that will fade out [make a black screen that fades out for 2 seconds], then come back? Is that possible? ON A FORM.
View 3 RepliesI've got a basic logon form where if you enter the right password/username, it redirects you to the "MainMenu" Form How can I make a function called "checkLogon" that checks the username/password text to a variable in that function?
View 3 RepliesHeres my code
Public Class Encryption
Private _cipherEngine As New Cipher
#Region " PassEncryption "
[code].....
I have a TextBox and set the MiltiLine property to true and AcceptsTab property to false.When the TextBox has focus and i press Tab it works fine and the next control get the focus, but when i press Ctrl+Tab it works as if AcceptsTab property is set to true and makes a tab character into the TextBox.The reason i press Ctrl+Tab.. when switching between forms in my MDI application.Now how to make a Ctrl+Tab when pressed works like Tab when pressed in a MultiLine TextBox?
View 1 RepliesI have a spreadsheet with this code:
'insert link
sheet1.Hyperlinks.Add(sheet1.Range("P1"), "http://http://www.vbforums.com", "")
the code of the button (ribbon)
[CODE]...
When I press the button, it connects to the web site. when the sheet1 is selected, it works, but when the sheet2 is selected, not works, why? the path is sheet1,What's wrong?
this is my code:
Dim WB As WebBrowser
WB = GetPage("http://speed.travian.ir/a2b.php?z=" + VillageID.ToString + "&c=" + Type.ToString + "&" + AttackParams)
[code].....
I have some functions in my VB.NET DLL which I can 'hide' from my VB6 app by using the following: <Runtime.InteropServices.ComVisible(False)> But is there a way to make a function ONLY visible to COM clients and not to .NET assemblies? This way I can use Shared methods for the .NET side avoiding the need for an instance declaration.
View 1 Repliesi just want to know how to make a function and someone give an example of polymorphism
View 6 Repliesif i have datagridview to have 4 columns
first col: Item Id
Second : Stock Id hint: Storage of items which we will enter it
third : Item Qty hint: Quantity of product Or Item
[code]......
I just started learning visual basic in VB 2005 express today, and the only other programming language I have used is AutoIt. Now in Autoit there is a function called "pixelsearch" where it allows you to specify a color, and coordinates left, top, right, bottom to search for a pixel that matches the specified color Example:$psearch = pixelsearch(0, 50, 100, 75, 16172309)
View 1 RepliesHow to make my own "My" librayr. I want to make exact function like in .Net
My.Resources
System.Data
that everytime i enter period on the library another sub library will come up.
Am using An inputbox in my form.If i Press OK the code is fine.When i Press cancel the Program displayin an error. Wat should i Do ?
View 3 RepliesI have a VB.Net exe application that has a function in it that contains my encryption method that is used through out my application. This function is used to generate all my encrypted passwords and files etc. therefore for obvious reasons I do not want this to be visible to end users. In my application this is fine as it is compiled as a .exe. However I want to now create a ASP.Net web based version of my application.
Now here comes the question, if I was to create a web version of my application then this function would be visible to the end users along with a large number of other functions that if edited could bypass security and license control.I would like to know what is the best way to keep my ASP.Net webbased version secure from tampering, or is ASP.Net not the best for this?