.net - Inconsistent Behavior From Declared DLL Function?
May 21, 2010
Why might my GetRawData declared function return a correct value when called from my VB.NET application, but return zero when called from my ASP.NET page?The code is exactly the same except for class type difference (Form / Page) and calling event handler (Form1_Load, Page_Load).
Note: In the actual code, #DLL# and #RAWDATAFILE# are both absolute filenames to my DLL and raw data file respectively.
Note: The DLL file was not created by Visual Studio.
Form1.vb
Public Class Form1
Declare Auto Function GetRawData Lib "#DLL#" (ByVal filename() As Byte, _
ByVal byteArray() As Byte, _
[code]....
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Dec 10, 2009
I have a treeview with Imagelist assigned to it. I find inconsistent behavior with the Images being displayed in treeview. When I run the app sometimes the images show up and sometimes they don't.
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Aug 15, 2009
Module Exercise
Private Function SetMembershipLevel()
Dim MemberAge
[code].....
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Jan 16, 2012
[code]...
In VB read HID, we detect the device as above successfully. (STM32L)
When sending a 8 bytes command to the device,
type Reg Value Index Length
40 48 00 00 00 00 01 00
with the nNumberOfBytesToWrite=2 (3rd paramater declared below), how to set the Buffer (2nd pramater declared below ) in the WriteFile function? Size of Buffer is within the limitation of OutputReportByteLength(=nNumberOfBytesToWrite).
[code]...
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Apr 19, 2010
I have written the following Sub in moduleFunctions to call in any form. But it gives an error: "Name 'txtVNO' is not declared" & "Name 'txtVNM' is not declared"
Public Sub txt_Clear()
txtVNO.Text = ""
txtVNM.Text = ""
End Sub
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Nov 5, 2009
I want to be able have the class autofire a function when it is first declared. In my example it would be to load from a file all the constant variables for use in the program.
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Jan 26, 2011
Yesterday I started my first DLL project which is for ArabicMessageBox that will allow arabic programmers to display there message in totally Arabic message.My project contain one Form only, and the basic code that I use is:
Public Overridable Function Show(ByVal APrompt As String) As MsgBoxResult
mLoad(APrompt, MsgBoxStyle.OkOnly, "")
Me.ShowDialog()
[code]....
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Feb 24, 2011
The following is a screenshot of the problem: What can I do?
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Sep 12, 2011
I have an application which was developed in vs2005 with numerous forms which use the combobox for selecting from lists of items. The usual setup is as follows:
Combo.Datsource = BusinessObject
Combo.DropdownStyle = DropDownList
Combo.AutoCompleteMode = SuggestAppend
Combo.AutoCompleteSource = ListItems
However, compiled under vs2005 when tabbing to a combo and typing a number of characters the combo would highlight the first matching item and on pressing tab, would select it and the user would move to next field.
With vs2008 the same item might be highlighted but pressing tab doesn't select the item unless its the only item matching the first character. The only way of selecting the item highlighted from the suggestappend is to press enter prior to the tab key.
I also noticed some users experiencing the same behaviour when the app was compiled with vs2005 on some PC's but not others as if it had something to do with the PC config.
Has anyone any ideas how to get around this as it can lead to errors in data capture.
Kind regards.
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Jul 8, 2010
Does anyone know if there's any particular reason that VB.NET construct syntax isn't consistent? For example:
If End If Select End Select You'd assume it would be for... end for, while... end while ... but instead we have:While.Wend For Next This has mildly frustrated me for a while, and I just got to wondering whether there was any conscious decision behind it. Or was it just an initial not-so-well-thought-out design decision that can no longer be changed because of backwards compatibility problems?
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Jan 18, 2012
Look at this simple bug :
<textblock (...) Width="0" />
Working great, the textBox appears to be 0px thin. Works with value like, 2, 3, 4...
Now that is NOT working :
<TextBlock (...) />
<TextBlock.Width>
<MultiBinding Converter="{StaticResource WidthConverter}">
[CODE]..................
Why can i set zero value to TextBox.Width in xaml and not in code behind ? By using a converter, when returing 0, the TextBlock.Width is not set to 0 but to "auto", i can read the text
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May 29, 2010
This works:
Dim zArray(5) As String
zArray = (From zS As String In zArray Select "HelloWorld").ToArray
This doesn't:Dim zArray(5) As String = (From zS As String In zArray Select "HelloWorld").ToArray
It seems inconsistent to me, though I may be missing a subtle difference instead of it being an IDE inconsistency?
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Apr 17, 2011
I wrote a software for auto-generating some lines of code. However when I do a copy and paste of that code in a class after reopening it again I confront an Inconsistent Line Ending Erros.[code]...
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Apr 6, 2009
I've got a contextmenustrip with a couple levels of dropdowns (submenu items). Let's say I right-click the form and show the "main" set of items, one of which is "Food". If I move the mouse over Food (not click it), a dropdown (submenu) for Food should open, which it does. But then, say, one of the food items is "Fruit". When I move the mouse over "Fruit", the Fruit submenu should open automatically - but it does not always - sometimes it does, but sometimes I have to click it to open it. Furthermore, once "Fruit" has been clicked once to open, any other dropdown items (let's say we had "Veggies" and "Meat") will automatically open as I expect; and then "Fruit" will behave as expected also.
Any ideas on how to correct this inconsistent behavior? (i.e. all sets of dropdowns associated with a contextmenuitem should open when the mouse is moved over it, a click should not be required)
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Jan 13, 2010
OVERVIEW:I am currently having an issue loading a large number of rows into Excel. I say large because the attached code in fact correctly inserts 50 rows into an Excel worksheet, however, as the number of rows increases to no more than500 rows the data is not inserted into the worksheet. No error is thrown by .net and the .xls filesize actually shows an increase in size, however, when the file is opened there are no rows in the spreadsheet..... Then, when the .xls file is closed the filesize is once again reduced.
Again, the code works for a small number of rows. Are there any known bugs with the OleDB driver for Excel?ADDITIONAL THOUGHTS:I have tried inserting rows to both Excel 2003 and 2007, same issue.I have tried closing the connection after each insert.... performance if horrible and it does not fix the problem.I have wrapped the ExecuteNonQuery in a transaction.... no go....
[code]...
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Dec 23, 2010
I'm trying to implement parallel computing using .NET 4 on an asp.net website housed on a clustered server consisting of 6-8 dual core servers. My original script contains two nested For...Next loops iterating through a range of values in a grid of x by y.
For each point in the grid (x,y), we should perform a computationally intensive subroutine called MakePartsMatrix which accesses a SQL server database with dataviews and manipulating the local variable "unfilled" which is passed in ByRef.
Without the parallel implementation, the nested for loops work fine except its slow -- taking about 60 seconds to run.
When I parallelize the outer For loop, the script is about 50% faster, completing its calculations in 20-30 seconds which is great. However, I have noticed that the parallelization causes random parts of the grid to be either completely skipped (eg, grid (1,5) is never evaluated by the MakePartsMatrix), or some points in the grid (eg, x=10 & y=5) to be evaluated multiple times, resulting in duplicate work.
When I parallelized only the inner For Loop, the script execution time also improves by 50%, but now the last row (y-1) in the grid is skipped entirely and the results in "unfilled" are completely wrong.
When I comment out the "MakePartsMatrix" subroutine, the parallellization (either inner or outer For loops) does appear to visit every point of the grid (x,y) once, and only once.
Dim ConcurrentListofResults As ConcurrentQueue(Of FindBestResults)
ConcurrentListofResults = New ConcurrentQueue(Of FindBestResults)
Dim FBSResultsItem As FindBestResults
[Code].....
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May 16, 2011
One of my unit tests seems to randomly pass or fail when I run it. The only thing that makes sense to me for why this is happening is if the data in the database is getting into a different state each time the test is ran, but I use transactions to rollback the database in each test - unless it's not working right. Here's my base unit test class and the unit test class that's having the problem. Can you see anything I might be missing or what else I should look for?
This happens with TestDriven.Net and the Visual Studio Unit Test Framework.
[Code]...
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Jan 20, 2010
I wrote a program that writes to a new created file a line of text. Anytime I try to open the new created file, I see a dialog box titled "Inconsistent Line Ending". I do understand why I receive this message. I wrote this program in VB.NET.
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Aug 2, 2011
I'm seeing a strange problem with the labels on the X axis of my charts. I've setup two chart areas and aligned them (which displays fine) and the user can manipulate the chart by selecting different date resolutions (Year, Month, Day, Week, Hour) and different time periods.
The issue I'm seeing is that if a user selects say Months as the date resolution the X axis label display is inconsistent. If a fairly broad range for the dates is selected the X axis displays absolutely fine but as the date range narrows the X axis starts to duplicate labels ( please see the attached images). The second Image had a date range of 1st of May to 1st of August and as you can see the labels are duplicated. This is my first go with the chart control so I could be missing something basic. [Code]
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Oct 22, 2009
Im simply trying to load a file on my network. The file is a database file for access.. This code opens the file on my computer. However on the four computers tested 2 of them throw an error stating that the user canceled the operation. However the user didn't do anything. The error is thrown automatically. The other two are working perfectly fine.
[Code]...
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Mar 3, 2009
I have a Visual Studio 2008 solution with project A referencing project B as a project reference. Project B references System.Data.Linq, but project A does not. Everything compiles and runs fine. I like this arrangement because avoiding a reference to System.Data.Linq in project A ensures that it uses project B methods instead of directly accessign System.Data.Linq methods, which I want to avoid.
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Oct 2, 2010
I have a class library that uses the IApplicationAssociationRegistration Interface [URL]
Heres the code:
Class Library
IApplicationAssociationRegistration Class:
Imports System.Runtime.InteropServices
[code]....
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Jun 14, 2011
How to use a .Net 3.5 Behavior in WPF .Net 4?
I get this error when I use .Net 3.5 in .Net 4:
Found conflicts between different versions of the same dependent assembly
I can solve problem with double click on that warning but it doesn't work in design view (It works for building well).
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Nov 27, 2011
A particular VB.NET project is actually throwing 'Build Failed' But when I try rebuilding again it says 'Rebuild Succeeded'. It keeps alternating this behavior. Kind of random. Any vbc.exe issue of long locking the PDB or xml files?
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Jun 29, 2011
I'm writing an in-house intranet application in ASP.NET and VB.NET. My 'customers' are beginner to medium-level users. All of our browsers are IE8 and above, standard.The application works great, except for one thing. The backspace key. When a user types an invalid number into a textbox, a RegularExpressionValidator and ValidatorCalloutExtender fire off and notify the user. Perfect. Except that, when the user closes the popup warning and notices the cursor is still flashing in the textbox, he/she feels it's time to hit the backspace key and delete that pesky field value.
Unfortunately, the browser interprets this action as a desire to go 'back' into the page history. My boss is screaming. His bosses are screaming. I have a headache.So, how can I turn off this behavior? I still need the backspace to eliminate characters in the textbox, but nothing else. Company policy here: Backspace is to delete characters from the screen. Nothing more, nothing less.
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Jul 8, 2011
Strange vb.NET application behavior/One application e.g. does some recursive operations against a ftp server as it synchronizes a local directory with a remote directory. When this part is finished, recursively I loop through the local directory to compare each individual file with a hash code table file retrieved from remote to be sure the source file and the destination file are identical. The processing speed to me during the coding was really satisfactory, but all over sudden the all over performance has been reduced by factor 3. So what happened was I closed an application named TeamSpeak. As you can guess it took me a while to figure out what was happening. This behavior is reproducible even with other applications like Outlook or Winamp?To make it short: e.g. TeamSpeak is up and running, my application runs 3 times faster than without TeamSpeak up and running ... same code - no changes !!!
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Sep 10, 2010
I have a combobox in a Windows form. I set the properties of the combobox as follow:
AutoCompleteMode: Suggest
AutoCompleteSource: ListIems
DropDownStyle: Simple
DataSource: some binding source
Problem when user enter value to the textbox and open the dropdown and filter out the dropdown list. When user mouse click an item in the dropdown list, it will not select the item and paste it to the textbox. User uses the down arrow to navigate to the item and click on the "enter" key and it will not paste the selected item to the textbox. The only way to select an item is using the down arrow key to navigate to an item and then "Tab" away and it will paste the selected item to the textbox.I want to be able to use mouse click or "enter" key to select an item from teh dropdown list.I want to set the DropDownStyle as "Simple" so user can think it is "textbox" and start entering value to it.
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Oct 15, 2009
how to negotiate a dataset via:
For Each dRow In quanDS.Tables(0).Rows
'do something to each row
Next
I now need to figure out now to loop through a subset of the records returned in the dataset - here's a VB6 example I need to convert:
strSQL = "select * from tblDQ order by xid, xcode, xDOS"
rsMaster.Open strSQL, conDB, adOpenDynamic, adLockOptimistic
rsMaster.MoveFirst
[code]....
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May 18, 2010
My program shows some browser. From a browser user can open maximized MDI form with some report. When user is closing the report, first MDI form with browser is became maximized.
2 forms have same MDI parent. Can I change this behavior to leave my first browser form without maximizing after second report closed?
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Jan 28, 2010
I have an issue where a ComboBox control will change it's Text value when it is resized. Here is some sample code that I worked up:
Option Explicit On
Option Strict On
Public Class FMain
Private Sub FMain_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
uxComboBox.DropDownStyle = ComboBoxStyle.DropDown
[Code]...
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