Bitwise Comparison

Dec 30, 2010

result = SendMessage(buttonhandle, BM_GETSTATE, 0, 0)
buttonChecked = (result = BST_CHECKED)

Now I want to know whether the bit for BST_CHECKED is turned on or not.

How would I do that?

I can do

buttonChecked = (result % 2 = BST_CHECKED)

Is there a better way?


Converting Bitwise And/not From C#?

Jul 21, 2011

Original Code ( curStyle = curStyle And (Not ES_NUMBER)

Changed Code (C#):
curStyle = curStyle & (!ES_NUMBER);

But it is giving me this error: Operator '!' cannot be applied to operand of type 'long'ES_NUMBER is of data type long.I tried changing it to int, string, etc. All doesn't work.

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Bitwise Shift - Getting Different Results In Vs PHP

May 15, 2011

When I run this command in PHP, I get:


The interesting thing is, that when I try to shift any number greater than int32 in .net, it yields bad results.. Every number under int32 (2147483647) yields the same results from php and or Is there a workaround for this in .net?

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Dec 29, 2010

Did anyone else read this article under Visual Basic News? I thought it was a very bad treatment of the subject. I especially don't like articles like that when the code they post relies on Option Strict Off.

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Boolean - Bitwise-AND Operation In .NET?

Oct 28, 2010

I want to perform a bitwise-AND operation in VB.NET, taking a Short (16-bit) variable and ANDing it with '0000000011111111' (thereby retaining only the least-significant byte / 8 least-significant bits).

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Logical And Bitwise Operators?

Aug 9, 2011

According to MSDN The And operator can act as a bitwise operator OR a logical operator.The only way to know if it is used as One operator or another is, If it is on the right side of an assignment operation? for example x = 3 AND 5. I cannot find any other instances where the bitwise operator would be used instead of the logical operator, are there?

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Operators - How To Bitwise Shift In .NET

Sep 13, 2009

How do I bitwise shift right/left in VB.NET? Does it even have operators for this, or do I have to use some utility method?

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Bitwise Property Values In Designer?

Aug 24, 2009

I have an abstract user control(baseModule) that has a property that I plan on using a bitwise comparison on to determine what export types are supported by that module. In the designer of a module derived from baseModule, I am presented with a combobox with the ability to just select a single value (Html, Xml, etc.) I would like to be presented with a drop-down checked listbox so I could select which values I want.How can I accomplish this inside of VS2008? I've seen other properties support this.

Public Class ExportTypes
Public Enum ExportType
Html = 1
Xml = 2[code]......

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C# - Bitwise Operations In Visual Basic .NET?

Jul 19, 2010

I'm re-writing some old application in VB.NET to C# and ASP.NET 3.5. Everything is going OK but I have this problem - and, as the database will not be changed, I must find a solution to it.The old app saves the list o desired days (from Sunday to Saturday) in a byte. This is the way it do it:

If chkDaily.Checked Then
daysBitmask = 127 ' This is for a full week


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Changing File Attributes (BitWise)?

Jun 14, 2009

m_ArchiveBoolean, m_HiddenBoolean, m_ReadOnlyBoolean, m_IndexedBoolean, m_CompressedBoolean are all form level booleans that's set from their appropriate Checkboxes on the form before this code runs in a BackgroundWorker.

Why is it that this code works:

Dim fi As New FileInfo(element)
With fi
If m_ArchiveBoolean = False Then


In this 2nd one attributes are being changed, but they're the wrong ones and I can't pinpoint it right off hand.

Edit: What the overall goal of this is that if the user has the attribute checkbox checked then the file needs to have it set, other wise the attribute (if it's present) needs to be unset.

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Bitwise Operations, Combining 3 Bytes To Long

Dec 4, 2011

I am trying to combine three Byte values to one Long value, like System.Drawing.Color.ToArgb() does.

I've looked up reference source code to find it and converted it to VB .NET:

Return CLng((CInt(red) << 16 Or CInt(green) << 8 Or blue Or CInt(alpha) << 24) And -1)

It works fine of course, but I don't really understand why alpha shifted by 24 is last, not first (so it would be in nice order 24, 16, 8). I don't really understand bitwise operations a lot. Also, this code snippet works for 4 bytes, which is redundant for me, I need just three bytes and I wonder if Long is still required when bytes are only three, wouldn't Integer do just fine in this case?

So, my question is, how do I rewrite this code to work with just 3 parameters? Do I need to use Long? And, I know this is silly, but is it possible to make byte shifting in order 16,8,0 instead of 16,8,0,24? It's really just aesthetics, but I am awful perfectionist.

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Set A Large Constant With Bitwise Operation On ULong?

Mar 1, 2010

This work nicely

Public Const test As ULong = 1 << 30
This doesn't work nicely
Public Const test As ULong = 1 << 31


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VS 2008 Bitwise Operation (Reversing Bits)?

Feb 16, 2011

I have written a simple application which saves information to an RFID tag. I am now trying to compress my data. The solution I have come up with involves bitwire operation.Basically I store 2 numbers per 1 byte (0-9, 10 being a period, 12 possibly being a negative/positive flag,13,14,15 unused as of yet).The code I am using basically shifts the byte containing a number left, 4 spaces, then 'OR's it against another number.Therefore 12 is now represented as 00010010. The problem i'm having is decompressing. Obviously getting the '1' back is easy, as I just shift right 4, then grab it. I need to append or remove the last 4 bits.My solution after many headaches was to reverse the bit order, shift left 4, then reverse, then tostring it.

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VS 2008 Changing File Attributes (BitWise)?

Jul 3, 2010

m_ArchiveBoolean, m_HiddenBoolean, m_ReadOnlyBoolean, m_IndexedBoolean, m_CompressedBoolean are all form level booleans that's set from their appropriate Checkboxes on the form before this code runs in a BackgroundWorker.

Why is it that this code works:
Dim fi As New FileInfo(element)


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C# - String Comparison In .NET?

Feb 17, 2012

What is the difference (in bref) between (.NET)

myString == otherString


myString.CopareTo(otherString) == 0

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Comparison Of VB And C# Communities?

Jan 19, 2010

read this post carfully before you dive headlong into outlining what's wrong/right with the communities.

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C# - Comparison Of Serializing Methods?

Dec 25, 2011

Possible Duplicate: Fastest serializer and deserializer with lowest memory footprint in C#?

I'm using BinaryFormatter class to serialize an structure or a class. (after serialization, I'm going to encrypt the serialized file before saving. (And of course decrypt it before deserialization))But I heard that some other serialization classes are present in .Net Framework. Like XmlSerializer, JavaScriptSerializer, DataContractSerializer and protobuf-net.I want to know, which one is best for me?Less RAM space needed for serialize/deserialize is the most important thing for me. Also speed is important.

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Comparison Syntax Between Two Datatables?

Mar 23, 2009

I am trying to compare two datatables and generate a resultant datatable of rows that do not match based on customer number.  The main table "Customers" contains all customers that have been placed in our system.  I am trying to generate a table of customers, "dtResults," that we have not ever generated an invoice from a table called "CurrentCust".I would like someone to look at the attached code and see how I can handle the 'InvalidCastException was unhandled', 'Unable to cast object of type 'System.String' to type 'CustomerDataTable' error.  Error occurs at line 43.

Option Explicit On 
Option Strict Off  


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Convert Vb Date Comparison To C#

Aug 24, 2011

I have a code in vb, and I'm trying convert it to c#.

_nextContactDate.ToShortDateString > New Date(1900, 1, 1)

This is _nexContractDate declaration:

Private _nextContactDate As DateTime

Comapre datetime to string?

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Datetimepicker Time Value Comparison?

Aug 7, 2011

im trying to compare time value of to two datetimepickers, i tried to use dt_Start.Value.TimeOfDay > dt_End.Value.TimeOfDay but it doesn't work. btw, i trying to make a scheduler. here are some of my codes:

Dim strUpdate As String
If dt_Start.Value.Date > dt_End.Value.Date Then
MsgBox("End date is earlier than Start Date. Please check.", vbExclamation, "Error!")
ElseIf dt_Start.Value.Date < Today.Date Then


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Inequality Comparison Operator In VB?

Dec 9, 2010

In C I write an if statement like:

if (a != 0)

How do I write this != operator in VB?

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IsNot For String Comparison

Oct 12, 2010

If Object.Value IsNot "Something" Then Can you do this, or are there certain cases in which it wouldn't work? Wasn't sure if this should only be used for integers and booleans.

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Make Comparison Between Pictures?

Oct 16, 2010

What code should I use to compare two pictures?

I tried those:

If PictureBox1.Image <> PictureBox2.Image then
End If
'and I tried this too:
If PictureBox1.image IsNot PictureBox2.Image then
End If
'But that all did nothing

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Use Or In Comparison Between File Attributes?

Feb 3, 2012

I have searched a lot on the web about changing file attributes in .net , it takes me a long time to get the final code but it was really good. But after all of my search I didn't know why we use "And" when we compare file attribute like this:

If (System.IO.File.GetAttributes(FilePath_txt.Text) And System.IO.FileAttributes.Hidden) = System.IO.FileAttributes.Hidden Then
MsgBox("File is hidden")
MsgBox("File isn't hidden")
End If

Otherwise when I want to set Multiple attributes for on file I have to use "Or" with it like this

System.IO.File.SetAttributes(FilePath_txt.Text, IO.FileAttributes.System Or IO.FileAttributes.Hidden Or IO.FileAttributes.ReadOnly)I know this isn't a big problem but , I can't write a code I don't know how it is actually works.

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Jul 14, 2009

I want somehow to temporarily store and compare two images capture from my web cam every 5 sec. (basically i`m going to use this as motion detection)I figure out how to perform pixel to pixel comparison but the problem is how can i store the images temporarily every 5 sec?Do i need an array?Can i avoid saving the images for the motion detection?Also is it better to convert the images into gray scale or black & white for the comparison or as they are

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Comparison Between Cell And Parameter Value - DataType

Sep 26, 2010

I want to compare between the cell value with the value (parameter) in database. As example, if my cellvalue value is 3 and my paramater(a) in my database is 5 it will be like this
if cellvalue<a then
(some code)
end if
I don't know the exact data type. The reason I need to use data type is because my data is dynamic.

Here is my
protected SubGridView1_RowDataBound(ByVal Sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowDataBound
con = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;DataSource=C:UsersmeDocumentsVisual Studio 2005WebSitesCSGCSG1.mdb")
[Code] ......

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Comparison To A File On A Different Computer On The Same Network

Jan 4, 2012

I have a computer that takes in a barcode through a Visual Basic program on one computer and I want to be able to compare that barcode as a String to data on a different computer on the same network by ethernet connection where the data is stored in an Excel 2010 file (.xlsm) in Column A in a workbook called 'Data.xlsm'.  Before the data is allowed to be saved or used further in the program on the first computer, I would like for the comparison to happen.

Some more details that you all may or may not need.

Computer 1 (where barcode is scanned): Windows 7, Office 2010

Computer 2 (where data file is stored): Windows XP, Office 2007

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Convert Images To Values For Comparison?

Nov 26, 2011

I am making a Texas hold'em poker game for my class project. I already have the cards in the game through an image list. I am now trying to compare the player cards with the flop, turn, and river card to tell the player what they have and if they have won or not. I have tried a number of different things but have come up short. This is the last thing I tried[code]...

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Dictionary Class And ContainsKey Comparison?

Mar 26, 2009

When using the Dictionary class when the key and value types are your own custom types, is it possible to specify the property of the key type object to use with the ContainsKey method? Best described with an example:

Dim dict as New Dictionary(Of CutsomType, AnotheCustomType)
Dim obj1 as CustomType ' Custom type with 3 properties ID, LastName and FirstName
Dim obj2 as AnotherCustomType


I could just omit the lines with ContainsKey but I'd prefer to know how it's making the comparison and how to change it if required. I don't want to use an integer containing the ID for the key type because I want to reference the whole object later on again.

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Excelsheet Comparison - Put All The Cells That Are Different In A New File

Apr 14, 2011

i have 2 excel sheets (file1.xls, file2.xls), both with 2 columns. the first column of both files contain keywords, (both files have the same). now i want to write code in excel that compares the 2 files and put all the cells that are different in a new file (file3.xls). i already saw an example here on the site, Excel sheet values comparison, but somehow it doesn't fit for what i need, and i don't get it to work.

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Integer Nearest Match Comparison

Jan 25, 2009

i'm building an image library and one of the things i want to do is compare the most common color in a given image to a set of established colors in rgb format the way i'll probably do this is create 3 arrays for the average r,g and b of each given image, and then compare them to my established values for r,g and b that i want to match to so if my first image has the average values of 255, 125 and 5 for r,g and b..what would be the best way to do a nearest match against my pre-established colors? (about 32 in total)

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Large Files For Data Comparison?

Sep 21, 2010

I am working on a program for a customer and am working in VB2010 in VB language. I have two rather large files that contain data. File #1 is over 300,000 lines of data. File #2 is over 100,000 lines. The files are CSV text files. On a User Form, there are two values, "StartTime" and "StopTime". This is the process I am doing:

1. Read both files into ArrayLists
2. Get item #1 of ArrayList #1 (we'll call this "A")
3. Get item #1 of ArrayList #2 (we'll call this "B")


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Objects Property Value Comparison Does Not Check For Nothing

Dec 9, 2011

I am using Entity Framwork and have an Entity Customer with a property of[code]...

However I noticed that this code does not get executed when Customer.CustomerStatus Is Nothing.

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Simple Checked List Box Comparison

Jul 27, 2009

I have a form containing a checkedlistbox, I want to be able to do a simple comparison between the checked status before and after to see if there has been any change. I have a copy of the "before" version of the checkedlist box and I thought I could just compare the two CheckedItems but it always thinks they are different, I could iterate through the entire checkedlistbox but I thought there would be an easier way.

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VS 2008 Efficiency Comparison Of Nested Ifs?

Jul 20, 2010

which is more efficient?(Assume case statements, etc., cannot be used.)

If a Then
If x Then
ElseIf y Then


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VS 2008 String Comparison Methods

Apr 27, 2009

currently I am using something like the following:[code]It seems to work fine, but I've seen posts on different blogs and stuff that say is better for some reason.Is this ok to use or should I be using

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VS 2010 - Comparison Of Dates When Value Is DBNULL?

Aug 1, 2011

I am trying to do a comparison between a date in my db and a date in a textbox.I am using the following

CDate(Me.txtVrijeDatum01.Text).Date <> CDate(reader("VrijDatumVeld01")).Date

It works pretty well except when the textbox is empty or the value in the db is NULL.

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.net - LINQ Null Date Comparison In Dataset?

Aug 26, 2011

I have a DataSet where I need to filter the collection where one of the date columns is not null.

How do you term this in LINQ?

This is what I have so far but there is a compiler error on the w.CompletedDate field in the Where clause.

Dim completed = From ins In InspectionDataset.Inspection.AsEnumerable _
Where (Function(w) w.CompletedDate IsNot Nothing) _
Order By ins.Field(Of DateTime)("UpdatedDate")

I have also tried it the below way but the compiler will not allow the DBNull comparison.

Dim completed = From ins In Inspection.AsEnumerable _
Where ins.Field(Of DateTime)("CompletedDate") <> DBNull.Value _
Order By ins.Field(Of DateTime)("UpdatedDate")

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C# - Changes Highlight In (like Beyond Compare): Text Or HTML Comparison

Mar 5, 2010

I need to highlight changes(diff) between 2 database text fields in a application. I'm used to "beyond compare" text compare, so the Ideal solution will do something like it, but if it just highlight the differences, that would be OK. [URL] The content is HTML, so if it could compare the HTML rendered text, it would be even better. So, i need a link or a control (free if possible) to do that job.

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Comparison Level How Does .NET Stack Up Against Delphi For Web Application?

Feb 8, 2011

I was surfing the next to get some of the powerful elements that .NET has over other langauges when it comes to VB.NET and I was told to learn delphi.

Since this is a VB.NET forum I was hoping you guys could tell me why I should stick with VB.NET over a language like delphi.

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