473,326 Members | 2,136 Online
Bytes | Software Development & Data Engineering Community
Post Job

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 473,326 software developers and data experts.

calling c++-exported dll functions from vb.net

hi all,

I have the following function defined in the header-file of a c++ project
struct DataType
{
...
};

long __stdcall my_func(DataType** ptr);

Now we have a double pointer (this has something to do with hidden
data-types, so this is un-avoidable). My question is, how would i go about
calling this function from a visual basic project (complete with marshaling
code).

Any help would be greatly appreciated !

richard


Nov 22 '05 #1
1 1091
Now we have a double pointer (this has something to do with hidden
data-types, so this is un-avoidable). My question is, how would i go about
calling this function from a visual basic project (complete with marshaling
code).


It depends on if the double indirection is there because you're
supposed to pass in an array of DataType pointers, or if the function
returns a DataType pointer to you. One of these should hopefully work

Declare Function my_func Lib "your.dll" (ByRef ptr As IntPtr) As
Integer

Declare Function my_func Lib "your.dll" (ByVal ptr() As IntPtr) As
Integer

Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.
Nov 22 '05 #2

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

2
by: Shailan | last post by:
Hi Im having trouble with the following code that seems to be behave differently when called from the browser as opposed to the command line. The calling script is a cgi that forks, with the...
4
by: Paul | last post by:
Hi, In SQL Books Online in the section on @@Error it gives the following example: -- Execute the INSERT statement. INSERT INTO authors (au_id, au_lname, au_fname, phone, address, city,...
8
by: Vinod | last post by:
Hi, I have a problem, i am calling an exe from asp program. Its not working fine. When i execute the exe through the dos program directly i get the desired result. My exe will convert files in...
7
by: Klaus Friese | last post by:
Hi, i'm currently working on a plugin for Adobe InDesign and i have some problems with that. I'm not really a c++ guru, maybe somebody here has an idea how to solve this. The plugin is...
17
by: Bill Grigg | last post by:
I have been successfully calling DLL's using VC++ 6.0 and also using VC++7.1 (.NET). I only mention this because I have never felt comfortable with the process, but nonetheless it did work....
5
by: Nick Flandry | last post by:
I'm running into an Invalid Cast Exception on an ASP.NET application that runs fine in my development environment (Win2K server running IIS 5) and a test environment (also Win2K server running IIS...
3
by: Mike | last post by:
Timeout Calling Web Service I am calling a .NET 1.1 web service from an aspx page. The web service can take several minutes to complete its tasks before returning a message to the aspx page. ...
7
by: =?Utf-8?B?UVNJRGV2ZWxvcGVy?= | last post by:
I have a C# logging assembly with a static constructor and methods that is called from another C# Assembly that is used as a COM interface for a VB6 Application. Ideally I need to build a file...
10
by: sulekhasweety | last post by:
Hi, the following is the definition for calling convention ,which I have seen in a text book, can anyone give a more detailed explanation in terms of ANSI - C "the requirements that a...
0
isladogs
by: isladogs | last post by:
The next Access Europe meeting will be on Wednesday 6 Mar 2024 starting at 18:00 UK time (6PM UTC) and finishing at about 19:15 (7.15PM). In this month's session, we are pleased to welcome back...
1
isladogs
by: isladogs | last post by:
The next Access Europe meeting will be on Wednesday 6 Mar 2024 starting at 18:00 UK time (6PM UTC) and finishing at about 19:15 (7.15PM). In this month's session, we are pleased to welcome back...
0
by: ArrayDB | last post by:
The error message I've encountered is; ERROR:root:Error generating model response: exception: access violation writing 0x0000000000005140, which seems to be indicative of an access violation...
1
by: PapaRatzi | last post by:
Hello, I am teaching myself MS Access forms design and Visual Basic. I've created a table to capture a list of Top 30 singles and forms to capture new entries. The final step is a form (unbound)...
1
by: CloudSolutions | last post by:
Introduction: For many beginners and individual users, requiring a credit card and email registration may pose a barrier when starting to use cloud servers. However, some cloud server providers now...
1
by: Defcon1945 | last post by:
I'm trying to learn Python using Pycharm but import shutil doesn't work
0
by: af34tf | last post by:
Hi Guys, I have a domain whose name is BytesLimited.com, and I want to sell it. Does anyone know about platforms that allow me to list my domain in auction for free. Thank you
0
by: Faith0G | last post by:
I am starting a new it consulting business and it's been a while since I setup a new website. Is wordpress still the best web based software for hosting a 5 page website? The webpages will be...
0
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 3 Apr 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 former...

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.