Unsigned 64 Bit Number To String
Apr 17, 2010Why does this not work ?
[code...]
I get "tostring cant be called without a narrowing conversion"
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VS 2010 - Unsigned 128 Bit Number - Min / Max
Nov 7, 2010I am trying to create a UInt128 structure, based on some C code I found. The 128 bit number is stored as two UInt64's. All was going well until:1. I tried to define MaxValue and MinValue. The code I found was
[code]...
VS 2010 Unsigned 128 Bit Number
Nov 7, 2010I am trying to create a UInt128 structure, based on some C code I found. The 128 bit number is stored as two UInt64's. All was going well until:
1.I tried to define MaxValue and MinValue.[code]
2. I tried to add. Apparently in C if you do the equivalent of this:[code]you do not get an overflow, the result "wraps".
Unsigned Long Random Number?
Jul 19, 2011I'm trying to generate random dates in between two dates that are selected with a date and time selection control.Ideally, I would like to get the 'ticks' of each date, generate a random number between those, and then convert that back into a date.However I'm getting arithmetic overflow errors when I try to generate a random number from the between the ticks. I've tried many approaches - directly seeding with both the low and high date ticks, as well as subtracting.
Private Function randomDate() As ULong
Dim rand As New Random(Date.Now.Ticks Mod Integer.MaxValue)
Dim holder As ULong = DateTimePicker2.Value.Ticks - DateTimePicker1.Value.Ticks
[code].....
Number Beside The String And The Number Will Increment Which Time The Button Is Clicked?
Jan 31, 2009I created a listbox using VB.NET. When the user select an item (it is a string format) in the listbox and click on a button, there will be a number beside the string and the number will increment which time the button is clicked. Anyone know how to do it...?Below is the coding I'd done, but I don't know how to do the increment part. Anyone know what coding I need to add?
Dim no As Integer = 0
listBox.Items.Add(listBox.SelectedItem & no)
Use An Unsigned 32 Bit Integer?
Sep 29, 2011i want to use an unsigned 32 bit integer. According to [URL]the rage of that type is
UInteger
UInt32
4 bytes
0 through 4,294,967,295 (unsigned)
[code].....
How To Handle 'unsigned Char *msg' Par
Sep 17, 2010I am trying to write a VB.NET program that will call a function in an unmanaged C DLL passing the structure like this:[code]What I have not been able to figure out is how to handle the "unsigned char *msg" part. How would you define this in the VB.NET Structure?
View 2 RepliesConverting To/from Signed/Unsigned Integers?
Jun 23, 2009I'm working with byte arrays and building and disassembling Int16/UInt16 and Int32/UInt32 from them. I'd like to not worry about the Sign bit until I return the final value and just have the code return the appropriate value for the data type that was requested to be converted to/from the byte array
View 3 RepliesHow To Pass Integer As Unsigned Parameter In .Net
Jul 16, 2010I'm new to VB.Net. I'm using a library call setInstance(ByVal instance As UInteger) in my VB.Net code. The parameter I need to pass is an Integer. Is there anything I need to do to convert the integer parameter to an unsigned integer? The number is garunteed to be positive and less than 10.
View 3 RepliesConvert A String Containing A Binary, Octal And Hex Number Into A Decimal String?
Jun 7, 2009I'd like to convert a string which contains a decimal number into string that contains the binary value, the octal and the hexadecimal value of that decimal number.Afterwards I also like to convert a string containing a binary, octal and hexd. number into a decimal string.Basically I'm looking for the functions:
dec2bin
dec2oct
dec2hex
bin2dec
oct2dec
hex2dec
I'd not prefer to rewrite a function, I'm sure the framework must have these functions already.
Converting A Number Into Number String?
Aug 28, 2010How can I do for converting 3 in "three". Or converting for example 153 in "one hundred fifthy tree"
View 7 RepliesGet A Number Into A Cell But As A String Not A Number?
Oct 1, 2009I am trying to get a number into a cell but as a string not a number. For example if I have the number as '12345678901234' instead of putting that exact number in it changes it to ' 1.23457E+13 '. How do I get it to read it as a string and not an integer? Here is the code that I am using.
Dim
num As String
If pRow.IsProjectNumNull = False Then
[Code].....
Implementing Two's Complement On Unsigned Integer Types?
Jun 24, 2011How can I implement a two's complement in VB.NET using unsigned integer types such as Byte, UShort, UInteger and ULong? Can I cast a UInteger to an Integer?
View 1 RepliesMimic C Behavior :: Adding Unsigned Integers?
Nov 7, 2010In VB .Net this code:
Dim t As UInt64
t = UInt64.MaxValue
t += 2UL
causes an overflow. It is my understanding that in C it "wraps". Assuming that is true, is there a way to mimic this in VB? I need this for an implementation of UInt128 I am trying to write.
Count The Number Of Times That A String Appears In Another String?
Jul 15, 2009How do I count the number of times that a string appears in another string. I know this code:
If odocument.ToString.Contains("window.alert") Then
pops = pops + 1
End If
But that will just see if the desired string contains "window.Alert" once, rather than how many times it does contain it.
64 Bit Unsigned Integer Overflow - In VB 2010 Express Edition ?
Jul 25, 2011I have an application that deals with some rather large number values. I wanted the values to allow a roll over so I compiled the program with Remove Integer Overflow Checks turned on. The 32 bit numbers roll over just fine but the 64 bit unsigned integers still throw an over flow exception. Is this a bug in the compiler?
View 7 RepliesC# - How To Properly Read 16 Byte Unsigned Integer With BinaryReader
Jun 9, 2010I need to parse a binary stream in .NET to convert a 16 byte unsigned integer. I would like to use the BinaryReader.ReadUIntXX() functions but there isn't a BinaryReader.ReadUInt128() function available. I assume I will have to roll my own function using the ReadByte function and build an array but I don't know if this is the most efficient method?
View 3 RepliesPulling Unsigned Left Shift Using Option Strict?
Dec 23, 2010How do I pull off an unsigned left shift in VB.Net while using Option Strict? Maybe I am doing it wrong, but while trying to implement my own IP2Long function (I have my reasons), I'm testing things to make sure I have my head wrapped around the conversion process properly. Tried a few tests, all seem to cause errors.
Dim a As Int32
a = CUint(172 << 24) 'Constant expression not representable in type 'UInteger'
a = DirectCast((172 << 24), UInt32) 'Value of type 'Integer' cannot be converted to 'UInteger'
a = Convert.ToUInt32(172 << 24) 'Compiles, but throws an OverflowException
The last one is especially befuddling. 172 << 24 is a mere 2,885,681,152, well under the limit imposed by the UInt32 data type. My assumption is .NET is doing the left-shift in signed mode, then tries to convert, to unsigned, and this tosses up some kind of error. Basically, my question boils down to this: why do unsigned numeric have to act like such hacks to the .NET framework at times? Is it really that hard for Microsoft to make Unsigned data types intrinsic to the framework?
Unmanaged DLL Structure Conversion (unsigned Char Pointer)
Oct 28, 2009I'm making a "wrapper" for an unmanaged DLL (written, I'm fairly certain in C). I have a c++ "wrapper" that I'm trying to convert to VB.net. I've got most of the program working, but I've hit a brick wall.
I'm trying to convert the following two structures from their c++ versions to their vb.net versions. I cannot be sure which is the problem because both must be passed at the same time. The error I am getting is thrown by the object and indicates "Invalid structure size specified". I can cause this error on other objects when I either don't set the dwSize variable, leave off a parameter or change the parameter type incorrectly. Note that the dwSize parameter is supposed to contain the size of each structure. I'm successfully calculating that for my other structures and I'm using the same method on these and the results appear correct, so I do not believe the problem is found there. The object uses a lot of structures and the rest of them are working. These two are the only ones with a) an unsigned character pointer b) an unsigned long array and c) doubles.
C++ versions:
CODE:
I don't think I'm missing any parameters - the help file seems to agree with me on this, but it's theoretically possible that there is something missing (though I don't think so for other reasons as well). My suspicion is that it's dwPalette, pImageData or pMaskData with (in my uninformed opinion) more suspicion on the pImageData and pMaskData.
Reading Signed And Unsigned Values From A Stream In Both Byte Orders?
May 23, 2011I need to read signed and unsigned 8 bit, 16 bit and 32 bit values from a file stream which may be little-endian or big-endian (it happens to be a tiff file which carries the byte order indicator at the start).I initially started by writing my own functions to read the values and was able to do so for unsigned values. e.g.
Public Function ReadUInt32() As UInt32
Dim b(4) As Byte
input.Read(b, 0, 4)
[code]....
But then I started looking at signed values and my brain broke.As an alternative, I found the IO.BinaryReader which will let me read signed values directly but doesn't seem to have any way to indicate that the data is big-endian or little-endian.Is there a nice way of handling this? Failing that, can someone tell me how to convert multiple bytes into signed values (in both byte orders)?
VS 2010 Signed And Unsigned Integer NOT: For Hex File Checksum Computation?
Feb 22, 2012I have been trying to compute the checksum for a line of hex code. This is to create a hex file which will be loaded onto an embedded micro.Some of you guys may not know how this is done so very briefly:
a line of hex bytes:
: 10 01 00 00 21 46 01 36 01 21 47 01 36 00 7E FE 09 D2 19 01 40
The underlined bytes are taken and summed. (in this case the decimal 960). and the bold is the checksum Only the 8LSB (or single least significant byte) is needed to compute the checksum... which in this case, 960 = 03C0 in hex, so only C0 is needed.Two's complement is then taken:
step 1) logical not of C0 which is
step 2) add one (integer)
BIN...........DEC...HEX
[code]....
So here is the code I have been using: (quick mention that in the string passed, the hex bytes are all grouped together, there are no space characters)
Public Sub CreateLine(ByVal Data As String)
'Dim BDataArray(DataLength) As Byte
Dim IDataArray(Data.Length) As Integer
[code]....
where i get into trouble is where i commented 'i get into trouble'. My code works, but it's rather crude Now, in that line i first convert the hex value (string) "SChecksum" into an integer. I want to NOT this, so I get my step 2 from my explanation. However, the results appears to be a signed logical NOT. which gives me the wrong answer. My hashed togther version simply subtracts 256 before the not, in order to give me the correct answer.
Basically, I would love for someone to chime in and point out the flaws in my function, and push me towards figuring out the 'proper' way of doing this. Also I can't quite wrap my head around what would happen in the case a string were passed to my function that is over 16 bits, but I imagine I would have to subtract a larger value than 256, before doing the NOT in this case?(whilst we're on the subject of functions, I've used a 'sub', in which case should I used a sub, and which case should I use a function?).
Convert A Byte From The Rs232 Port To Unsigned Char Or Any Other Variable To Process It?
Mar 24, 2010how can i, for example add a datum from the rs232 with other variable here is my code:
Dim ii As Byte
Dim c(100) As Char
c = Me.SerialPort1.ReadExisting()
[Code]....
Convert Positive And Negative Math.Sin (waveform Output Values) Into (unsigned) Byte Array?
Apr 19, 2011I'm creating an emulator for a device to simulate wave forms. My challenge is that when I try to convert the output of the following code, I can't convert the Math.Sin's double output into byte values that lend themselves to the byte array format required by an existing graphing control as listed at bottom below. I''m not sure how to handle this when the sin function creates negative values but the byte values will need to be positive and basically 'shifted up' so that anything over 127 is negative. (0 - 255) unsigned. BitConverter.GetBytes has been suggested but THIS is the result of that attempt.
[Code]....
How To Get Number From A String
Feb 8, 2010I would like to get number from a string eg: My123number gives 123Similarly varchar(32) gives 32 etc
View 5 RepliesHow To Get Number From String
Aug 7, 2009i 1 2 get number from string.
Ex: gsgfsg23sd ==> 23
sdfgdsf23dsf432 ==> 23432
.net - Get Line Number That Contains A String?
Mar 30, 2012How to get a line number that contains a specified string in a text file?
Example text file contains:
Red
White
Yellow
Green
How to get "Yellow" line number? and can i write a string in a specified line, lets say i want to write a string in line 2?
Add A Number To A String Cell?
Oct 18, 2010Sub adddashes()
Dim j As String
For u = 1 To 10
dashnumber = 1001
Range("D" & u).Text = Range("D" & u).Text + dashnumber
dashnumber = dashnumber + 1
Next u
End Sub
Ok on my sub, i have a list of names and i want to add a sequential dash number
NAME-1001
NAME-1002
NAME-1003..
etc....
However, i just straight up can't find the code to 'join' two variables or add a variable to an existing cell.....
Check For A Number In A String?
Jun 21, 2010I'm reading data in from a comma-separated text file and storing the data in an array for later use. Some of the values are to remain as strings, and I need to convert some to integers, for which I was trying to use, for example, integer.parse(ar(0)).
My problem is that the string values are randomly distributed through the text file, so I need to be able to test whether the string can be converted at all before doing the conversion.
Check If A String Is A Number?
Feb 5, 2006How do you check to see if a string is a numberic value?
View 7 RepliesComparing Number To String
Apr 11, 2011i am trying to compare user input number to with strings. i want the users to only input numeric values in a text box. but if they input a string i want an error message to go inform then to input numbers. this is the code i have:[code]
View 8 Replies