Re: How to simulate 'X' (the red button at the top right corner) ? - C / C++ / MFC Discussion Boards

Re: Definition of dllimport function not allowed

Mark Salsbery10-Mar-08 7:42

10-Mar-08 7:42

steve_rm wrote:
#ifdef NATIVEDLL_EXPORTS
#define NATIVEDLL_API extern "C" __declspec(dllexport)
#else
#define NATIVEDLL_API __declspec(dllimport)
#endif

Why is export extern "C" but import not the same?

Regardless, the NATIVEDLL_API macro should be used only on the function declarations (prototypes),
not on the function definitions/implementations.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Definition of dllimport function not allowed

C^hris L^osinger10-Mar-08 7:43

C^hris L^osinger

10-Mar-08 7:43

have you #defined NATIVEDLL_EXPORTS anywhere?

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Re: Definition of dllimport function not allowed

steve_rm10-Mar-08 16:00

steve_rm

10-Mar-08 16:00

Hello,

I got it working. However, I am not totally sure why.

Why did it work when I removed the NATIVEDLL_API from the function definitions, and what are the macros for?

Can you explain the code below?

Many thanks for you help,

Steve

<br />
#ifdef NATIVEDLL_EXPORTS<br />
#define NATIVEDLL_API extern "C" __declspec(dllexport)<br />
#else<br />
#define NATIVEDLL_API __declspec(dllimport)<br />
#endif

Re: Definition of dllimport function not allowed

C^hris L^osinger11-Mar-08 0:46

C^hris L^osinger

11-Mar-08 0:46

those let you create exports and imports from the same code base. when compiling the DLL, you use the export part, but when using the DLL, you use the import part.

it's standard DLL stuff that MS automatically creates for a DLL project.

image processing toolkits | batch image processing

How to simulate 'X' (the red button at the top right corner) ?

Hanan88810-Mar-08 6:45

Hanan888

10-Mar-08 6:45

I'm developing a game in win32 c++ DirectX.

On my graphic game window I have a picture of a 'close' button. When I click on it I want it to to the same as clicking the 'X' button.

But although I tried several things:

<br />
::SendMessage(hWnd, WM_CLOSE, NULL, NULL);

::SendMessage(hWnd, WM_DESTROY, NULL, NULL);

<br />
DestroyWindow(hWnd);

I get strange bugs that won't happen when I click 'X'.

Re: How to simulate 'X' (the red button at the top right corner) ?

Randor 10-Mar-08 7:02

Randor

10-Mar-08 7:02

PostMessage(WM_SYSCOMMAND,SC_CLOSE,0);

Best Wishes,
-David Delaune

Re: How to simulate 'X' (the red button at the top right corner) ?

Hanan88810-Mar-08 7:37

Hanan888

10-Mar-08 7:37

Thank you very much.

It seems like all crazy bugs are gone.

Re: How to simulate 'X' (the red button at the top right corner) ?

Mark Salsbery10-Mar-08 7:07

Mark Salsbery

10-Mar-08 7:07

Hanan888 wrote:
::SendMessage(hWnd, WM_DESTROY, NULL, NULL);

Don't do that! That doesn't destroy a window Smile | :)

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: How to simulate 'X' (the red button at the top right corner) ?

Hanan88810-Mar-08 7:47

Hanan888

10-Mar-08 7:47

Thanks.

I Really shouldn't post
::SendMessage(hWnd, WM_DESTROY, NULL, NULL);
as a real candidate.

I was pretty desperate when I posted that message... Smile | :)

Re: How to simulate 'X' (the red button at the top right corner) ?

Mark Salsbery10-Mar-08 7:54

Mark Salsbery

10-Mar-08 7:54

hehe the last act of a desperate programmer Smile | :)

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: How to simulate 'X' (the red button at the top right corner) ?

Hanan88810-Mar-08 22:50

Hanan888

10-Mar-08 22:50

"He got sick of it. Sick of life, sick of people, sick of Win32. Desperate and dispirited, he code ::SendMessage(hWnd, WM_DESTROY, NULL, NULL);. And I can tell you this: whatever it does, it doesn't destroy a window..."

Smile | :)

Re: How to simulate 'X' (the red button at the top right corner) ?

Mark Salsbery11-Mar-08 6:18

Mark Salsbery

11-Mar-08 6:18

Excellent!

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: How to simulate 'X' (the red button at the top right corner) ?

ThatsAlok10-Mar-08 22:35

ThatsAlok

10-Mar-08 22:35

Mark Salsbery wrote:
Don't do that! That doesn't destroy a window

Opps, let me check how many windows has been destroyed by me till date!

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
Never mind - my own stupidity is the source of every "problem" - Mixture

cheers,
Alok Gupta
VC Forum Q&A :- I/IV
Support CRY- Child Relief and You/codeProject$$>

Re: How to simulate 'X' (the red button at the top right corner) ?

Mark Salsbery11-Mar-08 6:19

Mark Salsbery

11-Mar-08 6:19

Huh? What are you talking about Alok? Smile | :)

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

C++ graph library equivalent to MSAGL or GLEE?

jwalsh10-Mar-08 6:33

jwalsh

10-Mar-08 6:33

Hello

I am looking for a graphing library simalar in look/functionality to MSAGL (previously called GLEE, see:
http://research.microsoft.com/research/msagl/[^]) for a project being developed in c++.

The problem with using MSAGL/GLEE is that it is written in c# for .net and I require a native c++ library which i can link into an existing project under development (build enviroment is borland turbo c++).

Can anybody recomend anything?

Many thanks in advance

J

Re: C++ graph library equivalent to MSAGL or GLEE?

Maximilien10-Mar-08 7:11

Maximilien

10-Mar-08 7:11

on top of my head, maybe GraphViz can do that ?

Maximilien Lincourt
Your Head A Splode - Strong Bad

Restricting others to inheritance from my class?

Kishore JP10-Mar-08 5:34

Kishore JP

10-Mar-08 5:34

Hello All,
Is there any way to restricting a class to be inherited? I dont want any one to inherit my class. I feel this can be possible only by making the constructor in private. Is there any other way to do this?

Regards
Kihore

Re: Restricting others to inheritance from my class?

CPallini10-Mar-08 6:00

CPallini

10-Mar-08 6:00

I think there is no way (other to switch to .NET programming).
But do you really need such a feature?

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

Re: Restricting others to inheritance from my class?

David Crow10-Mar-08 6:07

David Crow

10-Mar-08 6:07

Kishore JP wrote:
Is there any other way to do this?

A private constructor is the only way that I know of.

"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: Restricting others to inheritance from my class?

Randor 10-Mar-08 6:16

Randor

10-Mar-08 6:16

You should research the 'Singleton' design. Which is essentially making the constructor private.

The article and code from Paul DiLascia is a great place to get started.

http://msdn2.microsoft.com/en-us/magazine/cc188779.aspx[^]

http://www.codeguru.com/Cpp/Cpp/cpp_mfc/singletons/article.php/c755[^]

-David Delaune

Re: Restricting others to inheritance from my class?

Demian Panello10-Mar-08 6:21

Demian Panello

10-Mar-08 6:21

Yep.

Only restricting access to the members using the private keyword will cause an impediment to use it as base classe because the private members of the base class are unavailable in the derivates.
There's not a sealed attribute in C++.

Demian.

"I have always wished that my computer would be as easy to use as my
telephone. My wish has come true. I no longer know how to use my telephone."
-Bjarne Stroustrup, computer science professor, designer of C++
programming language (1950- )

Re: Restricting others to inheritance from my class?

Maxwell Chen10-Mar-08 6:25

Maxwell Chen

10-Mar-08 6:25