String Pointers - How To Get Name Output Parameter And Work With It
Jan 27, 2011
My application uses a third party API. This API uses a few functions that returns a value by reference as one of the function parameters. Problem is according to their documentation, the value I am trying to get out of this function is a string pointer.
So if that made no sense, heres an example of the syntax of the function as shown in their documentation:
long ExampleFunction(long ID, long PropNum, char* name, long MaxStringLength)
Input Parameters: ID, PropNum
Output Parameters: name, MaxStringLength
Thats pretty much all the info I've got. Obviously they are not using VB.Net, looks like C to me. I want to get the name output parameter and work with it, but once I get this value, I cant change anything. I know this is because its a pointer (reference type?) but I am still at a loss as to what to do.
I am retrieving the scope_identity of a db entry, and I want to use that variable in a different SqlDataSource, primarily as an but I am unable to access the variable.I have the variable being displayed in a msgbox, and it is displaying properly, I am just unsure how to access it in the SqlDataSource. Here is my code;This is the datasource that inserts the first information and received the scope_identity, as well as the _inserted event; Code:
I am working on a Asp.net based project and my requiremnent is to generate a PARTNO with the combination of MaterialType+ProductID and - 4digit random number?
NOTE: ProductID is Primary key and also set it to output parameter for example If material type is 500 and product ID generated 55 and random no generated 5434, then part no become 555-5434 how could I store partno in same table, I am somewhat trying like that
Connection.Open() Dim trn As SqlClient.SqlTransaction trn = Connection.BeginTransaction Using trn
I'm creating a tool using windows form which needs to retrieve data from an Oracle database configured to use odp.net using an Oracle Stored Procedure. I'm planning to use the code below for some basic testing. The Stored Procedure is made up of a number of OUT parameters, some of which have been mapped using the datatypes available in .NET, however other parameters are defined as tables (I guess lists) and i'm not sure how to access this data
Try Dim oraConnString As String = "Data Source=*****;User Id=******;Password=******;" Dim oraConnection As New OracleConnection(oraConnString)
ALTER PROCEDURE dbo.uspGetOrderTrackingHeaderInfo @ContractID varchar(9) , @SalesRepID int , @StatusID int , @TypeID int , @StartDate datetime [Code]...
We have an c# class, say we have a following method with out parameterpublic class TestCsharpClass{ public Int32 GetNumber(out bool pbNull){ pbnull=true; return 1; }}tlb file for C# project is generated with regasm tool. The above method is called in vb6 application using callbyName Dim number as IntegerDim objTest as TestCsharpClassdim blnNull as Booleannumber = CallByName(objTest,"GetNumber",VbMethod,blnNull) return value 'Number' is fine.But 'blnNull' boolean variable is "False" always.We were unable to get the out parameter value from C# code.Function signatures are defined in the IDL file.Without changing the function signature is it possible to get the resolution/workaround solution for this issue
I am having a stored procedure in sql 2005 the procedure is to retrieve year code between two days it works correctly in sql query analyzer and it returns value [code]...
I have a sql stored procedure with an output parameter. I'm just trying to read the output parameter in my code and I just cannot get it to work. The error I get is: "Procedure or function 'GetFolderData' expects parameter '@RootName', which was not supplied."
It looks like I am supplying this but it's not working.
Here is my stored procedure:
ALTER PROCEDURE [dbo].[GetFolderData] ( @RootID int,
Here's a simple code snippet of a larger function as an example.
Using conn as New SqlConnection("conn string") Using find as new SqlCommand("ExampleProc",conn) Dim rParam as new SqlParameter("@RESULT",SqlDbType.Int)
[code]....
I know the Output parameter is returned after the SqlDataReader is closed. From what I think I know, the Using statement will call .Dispose on the SqlDataReader, so will that basically wipe out the Output parameter? If so, what is the best method to call a SqlDataReader that also contains Output parameters that closes and disposes everything correctly? Let me add that based on what I've read you only have access to the Output parameter using a SqlDataReader after you call .Close on the SqlDataReader.
When I check the value of nAmount it stil contains the original value -1 the output value didn't return from the stored procedure although the number of records updated is 0 or more. The procedure was checked, it works and there are records updated and the value of @Amount is SET to a value 0 or more. I just don't get the values back. eventough the parameter @Amount is defined as OUTPUT. I also tried with outParam.Direction = Data.ParameterDirection.InputOutput instead of outParam.Direction = Data.ParameterDirection.Output . Same result. How do I get the value back from the stored procedure?
How would I use a value from an output parameter from a stored procedure in a vb 2005 application. I would like to capture a run date from the procedure and show it on several forms in the app.
I'm in the process of switching my application from MSSQL to MYSQL. When I was using MSSQL, I retrieved the last auto increment value via
Private Sub dsImpoundInformation_Inserted(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.SqlDataSourceStatusEventArgs) Handles dsImpoundInformation.Inserted _impoundId = e.Command.Parameters("impoundId").Value End Sub
[Code]...
ultimately, I'm just trying to get the last auto increment value but there are other sections of my code in other applications that I plan on switching to MYSQL that depend on output parameters. I have't yet explored using stored procedures but at this time I would like to get this to work in a similar fashion to how I had it with MSSQL.
The mSSQL server I have a stored procedure. That does not have an output parameter.When I run it in SQL Management Studio so the procedure will output 1 cell.
Getting command parser to work. I've made a new topic for this, because the old one isn't getting much attention, but also, I wanted to refine my questions, so that they would be easier to work with..
Here's how I have this code set up in my project..
I have a function module with public functions like so..
Code:
in my public class GameWindow I have the sub for the first rooms look command..
Code:
Now everything is going to be fed through a button click. User imputs MyString, and presses button. Here's the button code.
Code:
This isn't generating any output.. not sure how to go about getting it working. ha, I'm learning though...slowly, but surely. I like the hands on approach of implementing things into my project, and working with them. I learn better that way, plus the project'll get completed eventually.
The following output produces a string with no closing xml tag. m_rFlight.Layout = m_rFlight.Layout + "<G3Grid:Spots>" + Me.gvwSpots.LayoutToString() + "</G3Grid:Spots>"
I'm new to webservices and xml.I've been given the task of creating a webservice with a method called UploadData. UploadData(Username as string, Pwd as string, XMLdata as String)The XMLData will be xml data 2-5mb.Is String the best data type?I've tried the stream datatype and that does not work as a parameter on a webservice.
I've got a simple tool written in VB in VS 2010 that has a series of command buttons which run Windows command files and the output is sent to a Rich textbox object on the main form (the comand files take awhile to run so I wanted the output to show up in the RTB as it was produced to show progress). All worked well until I made an update to the tool so that the series of buttons are no longer hard-coded, but created dynamically from information in the app.config file. To do this, I use a button
I have buttons generated through code (dynamically). I have to associate an event (the same) to them. I use AddHandler button.click, AddressOf mysub.The issue is that mysub gets a string (mysub(string)), but AddressOf doesn't accept a parameter inside the routine. How can I do this? Using also an alternative to AddressOf.
EDIT:
Public Class Form1 ... Private Sub mysub(ByVal sender As Object, ByVal e As System.EventArgs, ByVal str As String)[code]......
After having some trouble in my own code using String.Split and the Split(String(), Int32, StringSplitOptions) overload, I decided to look to the MSDN.I copied the entire VB.NET code example from this link: url...I placed it in a new class, and received the following errors (same errors as my own code example):[code]Why can my code not recogognize the string() parameter overloads to String.Split? Remember, i took the code from the MSDN link above, copied and pasted and it still did not work.I am counting on using the string() instead of char() overloads shown here: url...
Id'like to pass some variables (string and integers) to a class, and when I call a method of that class, it has to change the original variable.I know it was not impossible in C#, but I'm using VB2010, I made a C# project into my solution, but methods using pointers are hidden into VB. How can I make that kind of change?
An example:
Sub ChangeValues() Dim A As Integer = 1, Str As String = "Start String" Dim X As MyClass(A, Str) X.ChangeInt(2)
have a 2d array of structures that holds about 5 or 6 details on each cell. The array size will not be known at compile time so I am using ReDim to resize it. I also have a list (think I have it as an arraylist actually but shouldn't matter really) that I would like to hold a pointer to one of the 2d array elements (as well as some other info). The list is a much smaller subset of the 2d array. The reason I am doing this is that the list needs to be sorted based on some data in the 2d array that will be changing. I don't want to have to search through the list each time to update the values as these lists and arrays can potentially be very large.
Maybe there is a better way to handle this but even if there is I would like to know how to simulate pointers in VB.Net. I know there are IntPtr's and references that I could probably use but I have no idea how to do it with dynamic arrays of structures. I'm familair with pointers from C++ but this is the first time I have tried to use (or simulate since there seems to be no real support for them) in VB.Net.
Not sure how clear that was so here are some snippets of the data types involved and some initialization.
Code: 'structures that are in the 2d array Structure SearchNode
where i put the *'s i get the error "The parameter 'address' cannot be an empty string. Parameter name: address".
Private Sub Timer2_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer2.Tick Dim mail As New MailMessage() Dim SmtpServer As New SmtpClient
I'm looking for something similar to using vectors and pointers that I've used before in C++; unfortunately, it doesn't seem like there's an equivalent function in VB.net.What I have is a copy of the array behind a multi-line Rich Text Box, and I need to separate the words from each line (or element of the array) so I can analyze each one separately.In C++ I would do something like this, so I could continuously expand as needed:
