How to expose std::vector in C Sharp - C# Discussion Boards

Re: Space Key problem

Justin Perez2-Oct-07 2:35

Justin Perez

2-Oct-07 2:35

SendKeys.Send(Keys.Space);

I get all the news I need from the weather report - Paul Simon (from "The Only Living Boy in New York")

Re: Space Key problem

mihksoft2-Oct-07 2:37

mihksoft

2-Oct-07 2:37

Doesn't work. The SendKey.Send receive a string parameter not a Keys

Re: Space Key problem

Pete O'Hanlon2-Oct-07 2:39

Pete O'Hanlon

2-Oct-07 2:39

In that case, how about SendKeys.Send(" ");?

Deja View - the feeling that you've seen this post before.

Re: Space Key problem

Justin Perez2-Oct-07 2:41

Justin Perez

2-Oct-07 2:41

My bad. Tack a ToString() to the end of that

I get all the news I need from the weather report - Paul Simon (from "The Only Living Boy in New York")

Re: Space Key problem

mihksoft2-Oct-07 2:45

mihksoft

2-Oct-07 2:45

Doesn't work.
If I put SendKey.Send(" ") it put me more than one space and the application freeze for few moments.
If I put SendKey.Send(Keys.Space.ToString()) it put me many SpaceSpaceSapce and the program will not stop

Re: Space Key problem

Justin Perez2-Oct-07 2:49

Justin Perez

2-Oct-07 2:49

try SendKeys.Send("{SPACE}");

I get all the news I need from the weather report - Paul Simon (from "The Only Living Boy in New York")

Re: Space Key problem

leppie2-Oct-07 4:50

leppie

2-Oct-07 4:50

mihksoft wrote:
If I put SendKey.Send(Keys.Space.ToString()) it put me many SpaceSpaceSapce and the program will not stop

It's pretty clear you doing it 3 times then! So use SendKey.Send(" ") and make sure it happens only once (which it is not doing).

xacc.ide-0.2.0.77 - now with C# 3.5 support and Navigation Bar!^
New xacc.ide release RSS feed^

How to expose std::vector in C Sharp

Dhanesh Nair2-Oct-07 0:35

Dhanesh Nair

2-Oct-07 0:35

I have created a COM server in which a collection of vectors need to be exposed to C# sharp client .

Each vector contains a array of structures and this vector need to be embedded inside a container, say another vector or list.

Code:
typedef struct
{
std::string name;
std::string type;

} STAGE_INFO;

std::vector<stage_info> m_stages;

m_stages.push_back(current_stage)

Since STL classes are not accessible in C#, I used a SAFEARRAY and VARIANT for exposing them. But I am not successful because of the following reason .

1) I am not able to create a VARIANT array of structures.
2) I created a SAFEARRAY of structures and included it in a VARIANT, but when accessed in C# as Object, I am not able to get the structure. Though I am able to typecast it into a Object array , but if accessed in separte gives exception.
3) I am able to access the members of the structure as they are string but not a STRUCTURE as a whole.
4) I tried containing a VARIANT of SAFEARRAY'S in another VARIANT, but it gives a casting error.
5) CComVariant cannot have USD's and VARIANT if used has some problem of Memory Leaks.

Please let me know if you have expertise in COM and C#.Net Interoperability.
or
Even if you have some alternate solution for this problem?

Thanks In Advance .. expecting your earliest reply.

_________________
Life Rocks,

$dhanu's$

Re: How to expose std::vector in C Sharp

Judah Gabriel Himango2-Oct-07 4:21

Judah Gabriel Himango

2-Oct-07 4:21

This is going to be very difficult because C# has no knowledge of std::vector, your STAGE_INFO struct, and to worsen things, your struct has std:string objects in it, which C# also has no knowledge of.

Instead of trying to make C# see all this stuff, could you instead expose functions that get data from the vector and return it in a C# friendly way? This could be done either using standard exported C functions or by using a C++/CLI wrapper which is then available to the managed world.

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: 3 years of marriage
The apostle Paul, modernly speaking: Epistles of Paul

Judah Himango

Class with symbol [modified]

N a v a n e e t h2-Oct-07 0:24

N a v a n e e t h

2-Oct-07 0:24

Hello,

Recently I came up with seeing a class some thing like this

public class Stack<T> : IEnumerable<T>, ICollection, IEnumerable
{
}

Could any one tell me what is <T> means ? Why it has to be given like this ? Any ideas ?

-- modified at 6:50 Tuesday 2nd October, 2007

HTML tag next to class was not visible

My Website | Ask smart questions

Re: Class with symbol

Christian Graus2-Oct-07 0:32

Christian Graus

2-Oct-07 0:32

The reason I despair for the future of this industry, is the large number of people who are scared of google.

The Stack class impliments three interfaces. It does this so that differing objects can share a common interface, when used for the same purpose.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Re: Class with symbol

Jens Meyer2-Oct-07 0:42

Jens Meyer

2-Oct-07 0:42

I think what Navaneeth tried to ask is, why is the Stack class implementing the IEnumerable Interface twice?!? Honestly I dont know either...

Re: Class with symbol

J4amieC2-Oct-07 0:47

J4amieC

2-Oct-07 0:47

It probably didn't, it probably implemented

IEnumerable

and

IEnumerable<T>

---

How to get answers to your questions[^]

Re: Class with symbol

N a v a n e e t h2-Oct-07 0:48

N a v a n e e t h

2-Oct-07 0:48

Christian Graus wrote:
The Stack class impliments three interfaces. It does this so that differing objects can share a common interface, when used for the same purpose.

You are mistaken me, I am not asking anything related to stack class. I was asking why <T> is used after class name ?

My Website | Ask smart questions

Re: Class with symbol

Pete O'Hanlon2-Oct-07 0:56

Pete O'Hanlon

2-Oct-07 0:56

Because you can use it with a generic. It's one of those new fangled .NET 2 things that's only been around since 2005 - I'm not surprised you haven't heard of it.

Deja View - the feeling that you've seen this post before.

Re: Class with symbol

N a v a n e e t h2-Oct-07 0:59

N a v a n e e t h

2-Oct-07 0:59

Pete O`Hanlon wrote:
Because you can use it with a generic

Thanks, But I am not clear on this ? What do you mean ? And what will be difference like giving normal class declaration ?

My Website | Ask smart questions

Re: Class with symbol

Pete O'Hanlon2-Oct-07 1:21

Pete O'Hanlon

2-Oct-07 1:21

It means that you can use the Stack class with a generic and it will use the generic IEnumerable interface. In other words, you can create a class as Stack<MyClass> and then rely on the fact that you have the IEnumerable<T> implementation to use.

Deja View - the feeling that you've seen this post before.

Re: Class with symbol

Judah Gabriel Himango2-Oct-07 4:15

Judah Gabriel Himango

2-Oct-07 4:15

The <T> means you can put whatever type you want in it. The T is short for Type. For example:

Stack<int> myStackOfIntegers = new Stack<int>();
Stack<string> stackOfStrings = new Stack<string();
Stack<MyFooType> stackOfFoos = new Stack<MyFooType>();

myStackOfIntegers.Push(5); // this works, because it's a stack of integers
myStackOfIntegers.Push("hello"); // Compiler error! you pushed a string on a stack of integers. This won't build.

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: 3 years of marriage
The apostle Paul, modernly speaking: Epistles of Paul

Judah Himango

Re: Class with symbol

DavidNohejl2-Oct-07 1:04

DavidNohejl

2-Oct-07 1:04

Clearer now. You are missing <T> at the first IEnumerable. Google for Generics, its "new" feature in C# 2.0

[My Blog]
"Visual studio desperately needs some performance improvements. It is sometimes almost as slow as eclipse." - Rüdiger Klaehn
"Real men use mspaint for writing code and notepad for designing graphics." - Anna-Jayne Metcalfe

Re: Class with symbol

N a v a n e e t h2-Oct-07 1:08

N a v a n e e t h

2-Oct-07 1:08

dnh wrote:
Google for Generics, its "new" feature in C# 2.0

Thanks. Now it's becoming clearer

My Website | Ask smart questions

Visual C# Button Link to website

Benjamin Dodd2-Oct-07 0:16

Benjamin Dodd

2-Oct-07 0:16

Hey

I have recently started C# programming
and was wondering, when i create a button i can make it display a message box however i want to know how this same button can also open a website URL.

Thanks in advance

Benjamin Dodd

Re: Visual C# Button Link to website

N a v a n e e t h2-Oct-07 0:26

N a v a n e e t h

2-Oct-07 0:26

Benjamin Dodd wrote:
how this same button can also open a website URL.

Create a new website url shortcut file. Open that file using Process.Start() method

My Website | Ask smart questions

Re: Visual C# Button Link to website

Benjamin Dodd2-Oct-07 1:15

Benjamin Dodd

2-Oct-07 1:15

Thanks for your help.

N a v a n e e t h wrote:
Open that file using Process.Start() method

so, example - Process.Start(C:\Documents and Settings\stc12191\My Documents)

is that right :s

i saved a webpage in my documents, so if i use the code:

Process.Start(C:\Documents and Settings\stc12191\My Documents)

will that open the web page

Smile | :)

thanks

Benjamin Dodd

Re: Visual C# Button Link to website

N a v a n e e t h2-Oct-07 1:26

N a v a n e e t h

2-Oct-07 1:26

You could look here[^] to get started with this.

My Website | Ask smart questions

Re: Visual C# Button Link to website

Christian Graus2-Oct-07 1:30

Christian Graus

2-Oct-07 1:30

Benjamin Dodd wrote:
i saved a webpage in my documents, so if i use the code:

Process.Start(C:\Documents and Settings\stc12191\My Documents)

will that open the web page

No.

1 - you didn't put the string in quotes
2 - if you have 20 web pages in this folder, how would you expect windows to just pick one, or even know you wanted to open a web page ? Process.Start starts a program, and if you give it a file, it tries to open it with the default program. So, if you put the name of the htm file at the end of that path, that will work.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.