Converting Any Data To IntPtr?
Jun 2, 2010
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 31, 2012
how to retrive the raw data of the image pointed by an intptr.The thing is the detector gives the pointer to the acquired image and I need to retrieve the image rawdata from the given intptr.
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Jun 28, 2009
What is the equivalent of IntPtr of Vb.Net in Vb6? For example what'll be the equivalent of the following 2 lines in Vb6?
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Jul 15, 2011
Im getting that error in the da.Fill(ds)
Imports System.IO Imports System.Data.SqlClient
[Code]...
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Aug 24, 2009
I see everywhere people use IntPtr, is there any reason I should use UIntPtr, instead?
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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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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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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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Nov 1, 2011
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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Jul 29, 2009
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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Nov 26, 2009
how I can convert an Integer of an object handle to an IntPtr?
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Aug 10, 2010
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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Mar 23, 2010
I need to explicitly convert my byte array into IntPtr to pass it to the third-party api. I've been looking through Runtime.InteropServices namespace but didn't find anything suitable.
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Oct 14, 2009
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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Jul 16, 2010
i need to save an array of intptrs as a part of a structure in a file, vb.net gives me "File I/O of a structure with field 'pList' of type 'IntPtr' is not valid." error, ok i figured and tried to convert them to integers and while it worked for other singular intptrs it did not for the array as it just throws me a conversion error. I then tried rebuilding the array in the new sub of the save structure and while that sorta worked(i think) it then gives a "bad size" error when saving. Im out of ideas, saving the array elements one by one would be suicide as the amount varies and is well in hundreds,
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Jun 26, 2009
We're in a strange situation with a legacy winforms VB.NET 1.1 application using ASMX web services. Trying to send a user Token from a WindowsIdentity object as a parameter to a WebMethod. I will be adding a 'HACK: comment. System.Security.Principal.WindowsIdentity.GetCurrent().Token
The token is of type IntPtr, the first problem is the WSDL being generated doesn't support IntPtr with the error of 'unsupported type'I'm aware this is a big WTF question and sounds insecure, so any simple helpful alternatives are welcome but there are a lot of constraints on how we can change this system, including complications with the hosting environment. So I would just like to get our piece of data over to the web service to save a lot of other headaches.
[Code]...
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May 20, 2011
[Code]...
How do I convert this proper? (Option Strict On)
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Jul 31, 2010
I have a SQL Server Table that contains country names. I have this table bound to a ComboBox control on one of my forms. The data itself witin the talbe is in lower case. how can I convert the data to upper case either in the table or the ComboBox?
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Oct 2, 2009
I'm trying to add data into a datagridview cell but I keep on getting a data type error.[code]Value of type 'Char' cannot be converted to 'System. Windows.Forms.DataGridViewCell'.[quote]
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Oct 15, 2009
Need to VB(QTP) Script code for converting an Excel sheet to an access database table. Is there any way to import the selected columns to in to the access database.
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May 2, 2011
I have a vb.net application. I just want to store a month as number in database. But frontend itself I want to display the month as name jan, feb ........like way in combobox. How to convert database value to month name . I am binding the data from databse to combobox.
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Jul 18, 2010
I have created an application that uses the web cam to take a photo and put it to the imgaelist. Now i would like to save this photo to SQL db by converting the photo to binary anf then storing it in Db.
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Nov 20, 2010
is it possible to communicate with a bluetooth device? I have a fairly simple heart rate monitor which has a USB stick, which connects wirelessly to the monitor.
It utilizes a serial port (COM3), where I can communicate with it. I've tried all sorts of data formats to parse the incoming bytes, from ASCII to INT32 to string... Nothing.
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Oct 17, 2011
I don't know how to convert the nvarchar value into an int, but that is the way it needs to be set up. I've found other posts about this but I don't know how to use CAST in the INSERT statement I have. All the posts I could find were about converting to int in SELECT statements. I need this statement to change the field @Duration to an int in the database. @Duration is an amount of time. (01:00, 02:00...) They will all get rounded up to the next int value. So if a user enters 0:45, it should be converted to 1. how to get this INSERT to work?
'SQL Insert: Product table
Dim sqlInsertProduct As String = "INSERT INTO Product (ProductName, Status,
CreateDate, ModifyDate, CreateUser,
[Code]....
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May 7, 2011
I'm having a bit of an issue with this program I have been working on for my class. It's a future values calculator, that takes a single data type, decimal data type and a integer data type does the formula and then spits back out the Future value. What i'm having difficulty with is converting the string over.
Public Class Form1
'Define the Module level variables
Dim FutureValueInteger As Integer
[Code]....
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Feb 26, 2009
Error converting data type varchar to datetime.rtfI am trying to learn ASP.NET using ASP.NET 1.1 with SQL Server 2000 for the database. I have created a Stored Procedure in SQL Server 2000 and the procedure to execute the Stored Procedure is in ASP.NET 1.1. The problem is that when I try to save a record, the date field returns the above error. I have ried to use the several solutions on the web without getting one to solve the problem.I am attaching the Stored Procedure as well as the ASP.NET code for some advice. I am also attached a word document containing the two procedures.
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Apr 29, 2010
When I try to close my form it gives me the following error; Error converting data type varchar to numeric. I have only one field which is numeric - ProjectID, and when I close this form sometimes this txtProjectID is empty and this calls the error. But if there is a number in the txtProjectID it closes fine.
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Aug 12, 2010
I am getting the error Error converting data type varchar to numeri when trying to save some of the information that is entered in a textbox to my sql server 2005 database. HEre is the code for my insert statement.
'declare your variables
Dim FirstName, LastName, Comments, MRN
Dim sConnString, connection, sSQL [code]......
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Sep 2, 2010
Using Vb.net/SQL Server 2000 updating a row via a gridview/sqldatasource
Stored proc:
@ISTag varchar(10),
@PCISTag varchar(10),
[Code]......
I don't understand where else it could be screwing up. I'd love to be able to keep it to a null value if it is one already, I'm just trying to get it to take anything right now and this is where I'm at.
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