I can call C code from Visual Basic by compiling that C code into DLL's.
1. Does it have to built in Microsoft Visual? Or is something built with MinGW okay?
2. How do I add it into my VB project?
3. How do I actually make the function call? (given that VB and C syntax obviously have some differences)
I have a project that has some VB code in it that I'm not allowed to convert to C#. I work in C# and not very good at VB, but I am needing to modify that VB code to use some C# methods I created.
For example:
C#:
Code:
using MGCIS2.Reporting;
using CrystalDecisions.Shared;
[code]....
At this line in the VB code (Dim crv As New Tax.Reports.CrystalReportViewer(_rdbc)) it is giving me an error:Too many arguments to 'Public Sub New()'
I have to call a Javascript function that takes 2 parameters and opens a new window. I need to call this function from VB.Net code-behind and I'm not sure how to do this. I can't find any examples of how this is done. Anyone have any ideas?
View 7 RepliesWhat exactly does the "calling code" means? A method to do an action?or else.,
View 6 RepliesI need to write a DLL in C that is used a plugin for an existing application.The DLL has to be compiled by the Visual Studio 2008 compiler with the following options.[code]It's then linked to applications library's.What it actually needs to do and what's causing me the issues is that within one of the methods it needs to pull data from a sql server 2008 r2. From what I've seen today you wouldn't be able to do this directly in C as SQL Server past 2005 is designed to communicate with CLR languages( C#, C++, VB.Net).It was suggested that I handle all the database communication with a VB.Net dll and then call said function from within the C dll. Most of what I've found on the topic of calling managed dll's from unmanaged code has talked about pinvoke or com wrappers and mainly from the perspective of c++.
View 2 Repliesi used v s 2008..i create a windows form application in vb.neti want help in which .........if i exit a sub *check_fill_for_New()* using EXIT SUB then in *bt_Ok_Click* sub not fire a msgbox......but it will also EXIT at half
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I created a DatePicker user control (ASP code below, no code behind) which is simply a textbox, image button, and a sometimes visible calendar.
[Code]...
Can I somehow tie or pass the value of the TextBox as the value of the whole control to use in the calling code? EDIT: My actual goal here is to be able to tie the SelectedDate as a parameter of a database query. I was able to select values for the other parameters in a controls dropdown list in a query parameter configuration window.
I have a function that is exported by a C library with the following signature:
extern "C" BOOL Func()
The function is declared in VB.NET code like this:
<DllImport("mylib.dll", CallingConvention:=CallingConvention.Cdecl)>
Private Shared Function Func() As Boolean
End Function
The problem is that I get an ExecutionEngineException when I call the function from .NET code.
Given that BOOL is typedef'd as int in this C code, should the declaration be different? If so, how should I be declaring this? As Short or Int32? Do I need to marshal the return value?
I am pretty well a novice to Visual Basic 2010 and am trying out the VB2010 express edition. I not the the coding syntax for VB2010 is different from VB6. I'd like well documented code for opening Excel, creating/opening a Workbook, reading and writing data and closing Excel Workbook when I exit the VB2010 form.
I am developing a VB2010 application form which I'd like to work dynamically with an existing MS 2003 Excel spreadsheet that will be provided with the application . The VB2010 form provides some data input for cells in a worksheet (named "Fuels") in an existing Excel Workbook called "carbonfootprinter.xls". Based on the input data, calculations are performed and the corresponding results are output to other cells in the same "Fuels" worksheet. The results are then also graphed in the Excel Workbook. When the application form loads, I'd like VB2010 code that checks if the "carbonfootprinter.xls" exists and is open, if not then it should be opened to receive data input from the VB2010 form and to perform calculations,and finally the VB 2010 application should close the Excel spreadsheet
We have a VB.NET program that needs to periodically call a function in an external, unmanaged DLL to communicate with our legacy application. We are having a problem with the application (seemingly) randomly not being able to find the DLL with the unmanaged code. Currently we use DECLARE FUNCTION blah LIB for the unmanaged code. Would it be better/more reliable to use DllImportAttribute instead? Or am I missing something else?
View 1 RepliesI Have just been watching a video on throwing Exceptions. Are you supposed to throw System.Exceptions from within your custom classes. to the calling code, Which other way can they communicate. I have read in several places it is bad practice to throw SystemExeptions.
View 3 RepliesThis is my c# code in some Dll
using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.Win32;
[Code]...
I am extremly new to this concept of aps.net and vb. all the tutorials I see are c# based or very basic for vb. What I have is a contact forum with some basic information. I got the whole "check if the user has input information correctly down pat how ever Its this whole, connecting to a database (sdf) if in another vb file ands calling that method into aspx file and proessing forum input to say "take this, insert into bla..." I come from java, JSP and J2ee bak ground where its not that diffrent and I dont have all week to read books and take baby steps. I have until tuseday morning to finsih this. Right now I am as far as forum validation....
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I believe there wont be any diff if user clicks the button on the form and the click event is fired OR if we call the button click event / function in the code. Because in one my project, this does make diff. If I click the button on the form, the App works great but same button if I click it thru the form code, the whole process crashes. This happens in Vista / VB.net.
View 12 RepliesMy understanding is that thread.join will suspend the execution of code on the calling thread until the spawned thread finishes or is aborted...
With that in mind, I tried this:
For i = 1 to 50
threads = New Thread(AddressOf test)
threads.IsBackground = True
threads.SetApartmentState(ApartmentState.STA)
[CODE]...
However, the rest of the code runs when the loop finishes, not waiting for all the spawned threads to finish. Since the rest of the code needs the threads to finish (otherwise the rest will error).
I've read thru Iceplug's tutorial on control arrays and got it working. I tried to add a new event by basically copying his click event code and calling it a doubleclick event. I used the proper addhandler and assigned the correct name to my sub. I have the click event changing the background color to blue and the doubleclick event changing the background color to green. The background color does not change to green. Why?
Heres the tutorial with my new code encased in asterisks ...
Code:
Imports System
Imports System.Windows.Forms
Public Class form1
[CODE]...
I have some code to execute code at runtime...
Here is the main
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Try
If TextBox1.Text.Trim <> "" Then
If TextBox2.Text.Trim <> "" Then
[code]....
When the button is pressed, it all works and the following files are created: yahoo.dll and yahoo.pdb My question is this: What is the code to load the already compiled yahoo files to execute the code again, without having to recompile the code?
I have a C++ application exe that uses a C++ dll. I don't have the source of this C++ application and cannot rebuild it. But I know that it uses the traditional LoadLibrary and GetProcAddress to access individual functions in the dll.For some reasons, I want to replace the C++ dll with a VB.NET dll. The dll is not and ActiveX and is therefore not registered.I think I cannot use a class but a module since the C++ exe application does not expect any class in the dll. In all my attempts, I could not have the inner functions of the VB.NET to be called by the C++ exe.How should I write the VB.NET dll?
View 2 RepliesI do realize that a number of questions regarding calling a DLL from vb.net have been raised. I have implemented the DLL from vb.net. I would like to know if the calling procedure is correct or should I be calling the DLL in a different way?
C++ DLL prototype
extern "C" int FitCurve(int solid_or_fluid, int prop_id, int fit_id, int N_points, int N_terms, char *file, double *x_data, double *y_data)
I'm not sure whether this is a VB forum question or a C++ question, but I'll try here first. I have an API library written in C++ (including source) which compiles to several DLLs. I want to call the functions in the library from VB but I can't get the parameter passing right.
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The above example runs but returns nothing. If I change DeviceName to ByRef, I get protected memory errors.
The full library and documentation is available on the internet if anyone would like to download it and I've successfully compiled it with VS2010.
I have a dll which has one function and I want to call this function from Visual Basic 2008. I tried every solution, but I couln't get it to work,
The original declaration is the following in C++
extern "C" CSSM_API void GetOptimalCSSMShaderParams(
float* outProjMatrixArray
,float* outCtrlMatrixArray
[Code].....
I want to connect to SAP and call RFC from VB.Net 2008.I have done it with VB 6.0 But not getting success in VB.Net I used following code in VB 6.0
Set ctlLogon = CreateObject("SAP.LogonControl.1")
Set oConnection = ctlLogon.NewConnection
oConnection.User = "SIILRFC"
[code].....
I have followed instructions on Best way to use a VB.NET class library from a C++ DLL? but being new to VB I don't know if I've got the VB part right let alone the C++. here I'll correct the code below for posterity's sake!
Here they are: VB first; the project is a Class Library, all settings default except that "Register for COM interop" is switched on in the project properties.
Public Class Class1
Public Sub New()
'do stuff
[Code]....
is the VB correct? Do I need to add anything like an interface to it? Assuming I want to call it over COM not C++/CLI, how do I do that. (This seems like the logical choice as the client already calls other stuff over COM; however, I'm not sure where to get the IDispatch pointer from, in my other code it's passed to me by the client). If I went the C++/CLI route, when moving up from toy project to actual implementation, that would mean changing my existing C++ code from "no clr support" to "/clr" - is that likely to break it?
I have a C++ application exe that uses a C++ dll. For some rasons, I want to replace the C++ dll with a VB.NET dll. The dll is not and ActiveX and is therefore not registered.I cannot use a class but a module since the C++ application does not expect any class in the dll. In all my attempts, I could not have the inner functions of the VB.NET to be called by the C++ exe.How should I write the VB.NET dll?
View 4 RepliesThis code was posted in Chit Chat and everyone is saying how great it is. I just have Visual Studio 2010 and no familiarity with VB6 so I thought it would be good to convert the code to Visual Basic 2010.
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This might seem like an insanely easy question, but I cant seem to find an answer anywhere to it. I'd like to think that I am decent at VB but while I was learning javascript the other day I found something that seemed awesome and now I cant figure out how to do it in VB.in javascript it looks like this
var someValue = getThatValue()Its both calling and setting the value from the getThatValue() sub. what is the VB equivalent?
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In C# I can do this:new SomeObjectType("abc", 10);
In other words, I can call new without assigning the created instance to any variable. However, in VB.Net it seems I cannot do the same thing.New SomeObjectType("abc", 10) ' syntax error
Is there a way to do this in VB.Net?
I was using .NET for development an SAP application but recently, it always shows me the message below:
failed to call remote function module
I didn't change any setting or source code. But it still has the problem.
i have been deploy webservice in vb.net .
is there will be any problem if i will cal the webservice from c++ (version 6) or Microsoft Access VBA?
By security reason I ask this... Can .cs or .vb files to run in any way without calling those in asp.net?
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