Crossover From Vb6 - Rtlmovememory - Copy Bytes Of Integer To A Variable
May 9, 2010
I am a .net beginner trying to make a crossover from vb6. I am trying to copy bytes of integer to a variable but I am getting this error msg. PInvokeStackImbalance was detected
A call to PInvoke function 'Tutorial_Class Dog!WindowsApplication1.ModAPIFunc::CopyMemory' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature.
Module ModAPIFunc
Public Declare Sub CopyMemory Lib "kernel32" Alias _
"RtlMoveMemory" (ByVal Destination As Long, ByVal _
Source As Byte, ByVal Length As Integer)
Ive got a few strings stored inside a string array, and i need to copy each string element into the integer variable on each iteration.how i would convert it? tried
I have query that involves a cross-language operation, namely converting 4 SBytes to a signed integer. The source language for this operation is Java, which utilizes the ByteBuffer in order to extract a signed integer from the data stream. The inner workings of ByteBuffer are at best a black box to me, as I haven't been able to find any hints to what actually goes on when Java extracts the integer. [Code]
unfortunately I cannot resort to C# in my current project, so I'll have to solve this without the unsafe keyword.I've got a bitmap, and I need to access the pixels and channel values directly. I'd like to go beyond Marshal.ReadByte() and Marshal.WriteByte() (and definitely beyond GetPixel and SetPixel).Is there a way to put all the pixel data of the bitmap into a Byte array that works on both 32 and 64 bit systems? I want the exact same layout as the original bitmap, so the padding for each row (if it exists) also needs to be included.Marshal doesn't seem to have something akin to:
byte[] ReadBytes(IntPtr start, int offset, int count) Unless I totally missed it..
In a current project I have to transfer big amounts of memory between separate programs in memory (average 10k/sec, sometimes 100k/sec).
I came up with shared memory (aka memory mapped files) as a solution. TCP is surely too slow and has far too much overhead.It works great in VB6 (in which one program is written) - very fast, few lines of code.One program has to be written in VB.net because it must interface to a library that does not support VB6. Unfortunately I cannot find a way to transfer the working code completely to VB.net.
In VB.net I can get a handle to the memory mapped file (created and written to by the VB6 program), a pointer to the memory but good old "rtlMoveMemory" does not give me access to the data as expected from VB6.The data stored in the memory mapped file does not arrive in the variable (stays 0). No error messages.
Private Const PAGE_READWRITE As Long = &H4 Private Const FILE_MAP_WRITE As Long = &H2 Private Const STANDARD_RIGHTS_REQUIRED As Long = &HF0000
I am using filesystemwatcher and im watching printer spool activities: Private Sub fsw_Changed(ByVal sender As Object, ByVal e As System.IO.FileSystemEventArgs) Handles fsw.Changed copyfile???? End Sub But, while printers status is spooling the files and size also changing, how can I copy file bytes by bytes?
Something like this: Dim a As ByteDim b As ArrayList Private Sub fsw_Changed(ByVal sender As Object, ByVal e As System.IO.FileSystemEventArgs) Handles fsw.Changed '+++++++++++++++++++++++++++++++++ get all new bytes and added to arraylist
After the arraylist gathered all bytes, I want to copy back to its original state of files to other location.... +++++++++++++++++++++++++++++++++++++++++++++ End Sub
Since I like to use the ReadAllBytes and WriteAllBytes methods to save my variables to disk, I have had no troubles thus far with Integers.It has been easy to convert a short integer into a string of two bytes to save them using WriteAllBytes as following example:-
ReDimxji(0 To 601) For I% = 0 To 300 J% = hbs(I%)
[code].....
But now I want to store some Single variables using WriteAllBytes, so I need to convert my single variables to a string of four bytes for each.
How can I get access in a fast way to the single bytes that form a double variable?
In pseudo-code I want to do something like this:
Dim myDouble as Double Dim myArray(7) as Byte myArray = myDouble
'continue doing things with the single bytes
The code is meant for use in a I/O-handler. The double-variables have to be sent / received via TCP. For this purpose they shall be put into / assembled from I/O-buffers.
I just need some syntax that will tell if a variable is an integer or not. I want to do something like this (i know this isn't correct syntax but this is the general idea):[code]
sgBox("********" + Microsoft.VisualBasic.Right(f, Len(f) - Len(vFilepath)) + " | File so ignored | " + i) where i is an integer, f and vFilepath are strings but I get the following message:Conversion from string "********~$SwitchSellReport - 230" to type 'Double' is not valid.All I want to do is put the number that is in i on the end of the string.
I want it to do is that you input a string, then you select an algorithm (Theres only going to be one RijnDael) then you input a key, then the Initialization Vector comes from "txtIV.text" then you select the key bytes and the block bytes from the numeric up/down, then you either encrypt or decrypt.
Ok i am having some issues designing a base-class to handle generics.Caveat is i need to restrict the type put in as a Numeric type, specifically Int16, Int32, or Int64 (Short or Long).I know you can do Of T as {Structure} but i dont want to select the key bytes and the block bytes from the numeric up/down.
Doing a calculation, variable is stored as an integer.It got too 2,147,483,647 before giving me an arithmetic overflow. Anyway i can increase the number it can hold?
I don't think I fully understand passing values from a sub to a module. Here is what I'm trying to do (problem is at the '****):
[Code]...
I think I've seen something like this before - where the actual function returns a value. Is this possible? Or would I have to pass an integer variable from the sub to the function, and then return it back to the sub?
I keep getting a ProtocolViolationException "Bytes to be written to the stream exceed the Content-Length bytes size specified." on the following code.I've tried setting Content-Length numerous ways with no success.
Dim url = "https://domain.com" Dim req As WebRequest = WebRequest.Create(url) req.Method = "POST" req.ContentType = "application/xml"
Does it read the entire message string sent by the client? I have a line to write to the stream later in the code and that does not seem to be sending anything back to the client, although the code around is excuting.
i = stream.Read(bytes, 0, bytes.Length) While (i <> 0) Try ' Translate data bytes to a ASCII string.
I have a problem when debugging a code. On top of class I declare an array, and the length of array is an integer variable which is applied value below declaration of array.
E.g. class declaration Dim array1 (2, integer) as string Public Sub integer = 5 End Sub
So basically, array is created with integer being 0 or whatever, because it is declared before integer was assigned a value. But the problem is, I need it to be declared at class variable so I can use array in different subs.
Is there anyway to customize a variable to use both an integer and a boolean value?For example. I am kind of making a simulation engine and using GDI as a visual aid, I am generating a grid of tiles for objects to be displayed, but I do NOT want to repaint all the tiles just the ones that have changed, so that I can save fps.So I thought if I could set a variable for the "tile number", "how many objects there are on a tile", and a boolean value for whether or not the tile needs repainted.[code]
I want to assign the value of the integer returned from the InStr method to a variable. So, If TextBox2.Text = "The Apple Pie" And TextBox1.Text = "App", I want the integer returned, which in this case would be 5, put into a variable, lets say its called 'VarString'. So VarString (would) = 5.
I am currently looking into the conversion of a string value to an integer. Obviously I will need to do some validation as to whether the passed value is in fact convertible to an integer.
At the heart of my question is this: the users' local is nl-BE (dutch (Belgium)), which means that we use a comma as decimal sign (and points as thousands separator); e.g. 123.456,78 would be a valid nl-BE number. Now, when using the numeric keypad, the decimal key will yield a point, not a comma (weird huh!). So many user will enter 123456.12 and when converted to an Int, this should yield 123456.
The thing is that I want to cover all possible angles; both points and commas may be used as decimal sign by the users. So I wondering if anyone has written some code that deals with such a situation. I was thinking of an extension method that makes the conversion based on whether a point or a comma is last used in the passed string (since no thousands separators should occur after the decimal sign).
