473,668 Members | 2,508 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

Run-time error '424' Object required

38 New Member
I'm invoking COM dll method from VB program.
COM interface method takes one of the parameter as IUnknown as below

HRESULT SetMethod([in] long samNumber, [in] IUnknown* List);

When i try to call this method from VB by passing "null" as the second parameter i get error "424 Object required."
I dont want to create a new object. Why can't i pass null as the parameter? Is there any other way without creating object? Please help
Apr 1 '08 #1
1 3705
tristanlbailey
31 New Member
Although I don't know of the procedure you are trying to call, since there are only two parameters in it, it is probably going to need data sent to both.

Objects are usually sent to external DLL procedures in the form of a Long data type. This is a variable that holds a unique handle number to the object, which can be retrieved from another DLL procedure.

How do you know the procedure requires an object? Do you have documentation on the procedure? Perhaps a better question; what is it that you are trying to achieve, exactly?
Apr 2 '08 #2

Sign in to post your reply or Sign up for a free account.

Similar topics

3
4923
by: leroybt.rm | last post by:
Can someone tell me how to run a script from a interactive shell I type the following: >>>python filename >>>python filename.py >>>run filename >>>run filename.py >>>/run filename >>>/run filename.py
4
3214
by: Ed | last post by:
Hello, I took a course in asp about 2 years ago and I was practicing with IIS 5.0. Then I put it down for a while. Now trying to get back to it. I can't run asp files from subdirectories of my root directory, but I can run asp files from the root directory of my website and I can run htm files from the subdirectories. If I run localhost/mytest.asp
15
4279
by: mg | last post by:
How can I run an .exe using C# from within the code behind of a WebForm app?
6
20069
by: orekin | last post by:
Hi There I have been trying to come to grips with Application.Run(), Application.Exit() and the Message Pump and I would really appreciate some feedback on the following questions .. There are quite a few words in this post but the questions are actually quite similar and should be fairly quick to answer ... (1) What is Happening with the Threads
9
19715
by: shank | last post by:
What is the proper syntax to run this command line in ASP? wzzip.exe File.zip File.txt thanks
6
2007
by: Joel | last post by:
2 Questions: (1) The documentation says application.run() creates a standard message loop on the current thread and "optionally" shows a form. This is really confusing because I was of the understanding that application.run() creates a message loop for the form and passes all messages to it. If showing the form is optional, and I want to to display 2 forms, which form will application.run() pass the windows messages to?
7
2939
by: Lee Crabtree | last post by:
I remember when I was first getting into .NET Forms programming that there was a rather emphatic rule about not constructing a form before calling Application.Run with it. So this: Application.Run(new Form1()); was okay, but this: Form1 form = new Form1();
8
3006
by: David Thielen | last post by:
Hi; In our setup program how do I determine if I need to run "aspnet_regiis –i" and if so, is there an API I can calll rather than finding that program on the user's disk and calling it? -- thanks - dave david_at_windward_dot_net http://www.windwardreports.com
26
2298
by: Chief | last post by:
Hello i would like to know which syntax do i have to use in order to make a program run other *.exe program and also how to put inputs in it for example i want to to make a program that run other file call try.exe and save all the stdout into a file thanx
7
11741
by: mxdevit | last post by:
Task: run application from ASP.NET for example, you have a button on ASP.NET page, when press this button - one application is invoked. the code to run application (for example, notepad) is (on C#) System.Diagnostics.Process.Start("notepad");
0
8378
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it. First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
0
8890
Oralloy
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed. This is as boiled down as I can make it. Here is my compilation command: g++-12 -std=c++20 -Wnarrowing bit_field.cpp Here is the code in...
0
8653
tracyyun
by: tracyyun | last post by:
Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
0
7398
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own.... Now, this would greatly impact the work of software developers. The idea...
1
6206
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules. He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms. Adolph will...
0
5677
by: conductexam | last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one. At the time of converting from word file to html my equations which are in the word document file was convert into image. Globals.ThisAddIn.Application.ActiveDocument.Select();...
1
2786
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
2
2018
muto222
by: muto222 | last post by:
How can i add a mobile payment intergratation into php mysql website.
2
1783
bsmnconsultancy
by: bsmnconsultancy | last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.