Convert IntPtr To Int64?

Sep 24, 2010

How can I convert IntPtr to Int64?

vb
Convert.ToInt64(GetForegroundWindow())

error :Unable to cast object of type 'System.IntPtr' to type 'System.IConvertible'.

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how I can convert an Integer of an object handle to an IntPtr?

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I'm trying to get the window of a game (jedi academy) I keep getting this error Cannot convert type 'integer' to system.intrptr This is were its underlined in blue DirectCast(Me.hWndGame, IntPtr),

Imports Microsoft.VisualBasic.CompilerServices
Imports System
Imports System.Runtime.InteropServices

[code]....

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In working with large prime numbers, I appear to have stumbled on a problem. Powers of 2 are showing up okay, but when I try to add or subtract from them, I get erroneous results. Below are the powers of 2, minus 1, for exponents 51 through 56. Notice that, starting with exponent 54, The resulting number is even, which is obviously incorrect. I used data types INT64 and UINT64 and got the same results for each.Here is my code and a partial list of the results:

Dim i, iTest
As UInt64
rtbIsPrime.Text = ""

[code]....

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Be it in 32 or 64 bit system?

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Im reading data from a VB random file.

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Why is the int64 value not the same as the dateticks value?? How do I convert the int64 value to dateticks value?

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for example
dim h as integer
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Will that detect whether the integer should be int64 or int32? What about if we run the program twice. Once we use small numbers and latter we'll use big numbers?

Let's look at this for example: vb.net Dim vector1 As List(Of Int64)Dim vector2 As List(Of Int64) vector1.Sort()vector2.Sort(Function(x As Int64, y As Int64) As Int64Return y - x

What about if I do: vb.net vector1.Sort()vector2.Sort(Function(x As Int64, y As Int64) As Int64Return y - x

[URL]

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I see everywhere people use IntPtr, is there any reason I should use UIntPtr, instead?

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I have a function that I need to pass data to but the only type of data the function is allowed to accept as a parameter is IntPtr (yep you guessed it, Windows APIs). Would I be able to actually pass anything useful to it? In the case I'm looking at right now it would be a List(Of T) that I need to pass to the function? At the moment I'm resorting to just using a class level object that both the calling method and the function that accepts IntPtr can access, but I would like to negate the need for this if possible.

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May 27, 2009

i am using SendMessage to send a message with a LPTSTR in WPARAM from a dll to my vb.net form and i get it by overriding WndProc but the problem is when using Marshal.PtrToStringAuto on the WPARAM it doesn't work, the strange thing is that if i monitor WM_SETTEXT of the form and use PtrToStringAuto to get the string from LPARAM it works, i guess mine doesn't work that's because the dll is loaded by other application.

C++ DLL Proc
Code:
LRESULT CALLBACK CallWndProc(int nCode,WPARAM wParam,LPARAM lParam)
{

[Code]...

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Aug 2, 2011

This sounds like a silly question, and it may not even be possible, but say I have a MemoryStream in my code. Is it possible to get the IntPtr of said MemoryStream?

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Continue On An Old Respond About System.IntPtr

Oct 18, 2010

The idea with System.IntPtr is to represent an integer whose width in bits correspond to the size of a pointer in the hardware and operating system that the CLR is running in, it's platform specific in other words. It supports 32-bit and 64-bit architectures only.This is a legacy from old-style C API's where pointers and ints were frequently treated as interchangeable. The Win32 API has many such parameters, where the width varies with the underlying architecture thus the mess with porting of code from 32-bit to 64-bit (we already did this once when going from 16-bit to 32-bit, funny how we never learn...).In practice, as is mentioned in other responses, it can be used to hold unmanaged resource handles and pointers etc that stem from the underlying Win32 functions. It can also be used to hold integers of the natural size for current platform. You can also use IntPtr.Size to dtermine the size of a pointer on the current platform.SO when you explain this to a child ;) this would be used to let program's flow at the same speed at diffrent kinds of operating systems?

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Error - Value Cannot Be Converted To System.Intptr

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I am trying to setup a call back (delegate) in my code for the DirectSound.Notify so I will be called when the sound buffer reaches a certain postion druing play back. My Code is the following:

'Set up call back
Public Delegate Sub NotifyHandler()
'.....
Dim NotificationHandler As NotifyHandler

[code]....

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I need to get the address of an integer and assign it to an IntPtr to use in an API.[code]...

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Always when i want to create a Executeable and i use the CodeDom Compiler i always get the Error:

The Type IntPtr is not defined
My Compiler Options:
options.ReferencedAssemblies.Add("System.dll")

[code].....

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[Code]...

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[Code]...

How do I convert this proper? (Option Strict On)

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See where my vb.net equivalent of a working c# assignment statement is not working?

bytes(i / 2) = Convert.ToByte(hex.Substring(i, 1), 16)

Here's the c# followed by the vb.net function.

private byte[] StringToByteArray(String hex)
{
int NumberChars = hex.Length;
byte[] bytes = new byte[NumberChars / 2];

[CODE]...

And the vb.net that is throwing the error within the for loop

Private Function StringToByteArray(ByVal hex As String) As Byte()
Dim NumberChars As Int16 = CShort(hex.Length)

[CODE]...

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[Code]...

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