Solved

Unmanaged DLL: C# variable for C++ char**

Posted on 2009-07-13
2
399 Views
Last Modified: 2012-05-07
Hello.

I'm making an application that works with buffers. I have to call some C++ functions with data pointers as arguments. I'm trying to not use unsafe code.
One of the functions have two parameters of type char*. I've defined on C# two buffers:

byte[] Buffer1 = new byte[SIZE];
byte[] Buffer1 = new byte[SIZE];

On the dllimport I use marshaling:
....
[MarshalAs(UnmanagedType.LPArray)] byte[] buffer1,
[MarshalAs(UnmanagedType.LPArray)] byte[] buffer2,
....

These two buffers are filled by the C++ function.
Two retrieve the data of the buffers, I use another C++ function. This function returns in a parameter the last buffer filled:

void FillBuff(char **Pbuff);

Pbuff is a pointer to one of the byte[] buffers defined above.
The problem is that I don't know how to define a C# to assign the pointer returned by the C++ function and accessing to the buffer's content. I've tried several thigs with no success, some of them dying at compilation time, others at execution time.

Any suggestion?

Thanks in advance
0
Comment
Question by:xmasdeu
2 Comments
 
LVL 41

Accepted Solution

by:
graye earned 250 total points
ID: 24859078
0

Featured Post

Courses: Start Training Online With Pros, Today

Brush up on the basics or master the advanced techniques required to earn essential industry certifications, with Courses. Enroll in a course and start learning today. Training topics range from Android App Dev to the Xen Virtualization Platform.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
What .NET URL re-routing tool did I use? 2 54
System.Security 2 27
Simple Injector with Web Service 4 39
Programmatically storing deadlock graphs with SQL Server 6 40
Calculating holidays and working days is a function that is often needed yet it is not one found within the Framework. This article presents one approach to building a working-day calculator for use in .NET.
Performance in games development is paramount: every microsecond counts to be able to do everything in less than 33ms (aiming at 16ms). C# foreach statement is one of the worst performance killers, and here I explain why.
Along with being a a promotional video for my three-day Annielytics Dashboard Seminor, this Micro Tutorial is an intro to Google Analytics API data.
Two types of users will appreciate AOMEI Backupper Pro: 1 - Those with PCIe drives (and haven't found cloning software that works on them). 2 - Those who want a fast clone of their boot drive (no re-boots needed) and it can clone your drive wh…

808 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question