C / C++ / MFC

Calling .NET DLL from MFC App

16-Apr-08 2:39

Oh really I used of google for that search .

Shivarudrayya H15-Apr-08 19:55

15-Apr-08 19:55

Hi Friends,

I want to develop a dll in .Net to send email (using namespace System.Web.Mail),then i want to call it in MFC application.

So i want to know whether is it possible to call .Net dll in MFC App??

If yes,let me know in detail.

Thanx in advance..

Reagards
Shiva

Saurabh.Garg15-Apr-08 22:54

Saurabh.Garg

15-Apr-08 22:54

Google search for calling managed dll from native[^] gives this http://support.microsoft.com/kb/828736[^]

-Saurabh

Shivarudrayya H15-Apr-08 23:02

15-Apr-08 23:02

True, But I am using MS Visual Studio 6.0.
How to do it in that? any idea..?

Reagards
Shiva

Saurabh.Garg15-Apr-08 23:10

Saurabh.Garg

15-Apr-08 23:10

Well you cannot create a managed dll in VC++ 6.0 so you have to use at least VC 2002 for that purpose. Once you create a managed dll it can consumed from any COM compatible language. So you can call it from VC++ 6.0.

-Saurabh

Javed Akhtar Ansari15-Apr-08 23:10

Javed Akhtar Ansari

15-Apr-08 23:10

You can do this.
you just need to add a reference to the dll in the Proect\Property window under the COmmon Property\Refernece link.
Click to the add new reference button and browse to the you .net dll.

You can now use your dll in MFC. You should use gcnew insteasd of new for creating an object to a managed class.

Javed A Ansari
Software Developer
Hyderabad, India

Shivarudrayya H15-Apr-08 23:18

15-Apr-08 23:18

I am using MS Visual Studio 6.0. There is no such options?

Reagards
Shiva

jhwurmbach15-Apr-08 23:58

jhwurmbach

15-Apr-08 23:58

Shivarudrayya H wrote:
So i want to know whether is it possible to call .Net dll in MFC App??

If yes,let me know in detail.

Yes, it is.
See here[^]

Let's think the unthinkable, let's do the undoable, let's prepare to grapple with the ineffable itself, and see if we may not eff it after all.
Douglas Adams, "Dirk Gently's Holistic Detective Agency"

Hamid_RT16-Apr-08 0:47

16-Apr-08 0:47

See this[^] thread.

Shivarudrayya H16-Apr-08 1:07

Job Interview Question: How can I play a movie using Visual Studio

16-Apr-08 1:07

I am using Visual Studio VC++ 6.0.
But that artical is specific to Visual Studio 2005..!!

Reagards
Shiva

kanekcwu15-Apr-08 19:37

kanekcwu

15-Apr-08 19:37

I recently got offered a job by this entrepreneur. He basically knew that I was a programmer and wanted to hire me but he had one condition: By tomorrow I am suppose to create a Visual C++ program in Visual Studio 2008 that is able to play movies and through the code chose what position (what time) of the movie to start. He doesn't care how I do it or who I ask, he just want it done.

Since I have no Visual Studio experience, (I program in Java and a little C) I tried looking around at the different options I have. I came up with 4.

1. I can use a command line through C to call window media player but then I would not be able to chose what position of the movie to start playing
2. I can use MCI but when I tried dragging the code in http://msdn2.microsoft.com/en-us/library/ms712870(VS.85).aspx on to my program I got compiling errors.
3. I can try using the Window Media Player 10 SDK but that seems really compilcated and I don't have the time to learn all that in a day.
4. I can try using some other open source programs or thir-party program like VLC and hope it would run.

I basically tried each of those options and I always run into compiling problems, I think I am the closest with MCI but I am not sure. I am jsut very stump right now as I realize if only I have time to learn VIsual Stuido 2008, how easy and fun it would be to make Windows program. Can anyone give me any hints or advice on how to solve this problem? I would be very grateful.

Thanks

PS: I use Windows XP

Re: Job Interview Question: How can I play a movie using Visual Studio

Mukesh Kumar15-Apr-08 19:55

Mukesh Kumar

15-Apr-08 19:55

Option 2 is best for you.

USE MCI to solve your problem....
and read these articles:
1. http://www.codeproject.com/KB/audio-video/hmediaplayer.aspx[^]

2.http://www.codeproject.com/KB/audio-video/moemeka7.aspx[^]

3.http://www.codeproject.com/KB/cpp/media_player.aspx[^]

Mukesh Kumar
Software Engineer

Re: Job Interview Question: How can I play a movie using Visual Studio

rjkg15-Apr-08 23:05

rjkg

15-Apr-08 23:05

use DirectShow it is very easy to learn and in couple of hours
you will be able to play the movies on window platform

Rajesh

Re: Job Interview Question: How can I play a movie using Visual Studio

Hamid_RT16-Apr-08 0:36

16-Apr-08 0:36

You can use of MCI function,they can show video files.

dll problem

trioum15-Apr-08 19:12

trioum

15-Apr-08 19:12

how to get the import library from the .dll file
actually I dnot have the source code of the .dll file

Trioum

Hamid_RT15-Apr-08 19:45

15-Apr-08 19:45

Where was this dll,it doesnt have any Readme?

trioum15-Apr-08 19:55

trioum

15-Apr-08 19:55

actually it is third party dll . they send me the sample application
that use run time loading of .dll i.e. using getprocaddress ()etc.
that is very hard I donot want to use this. thats why I am asking for
import libary .

Trioum

Stephen Hewitt15-Apr-08 20:17

Stephen Hewitt

15-Apr-08 20:17

Ask the third party instead. It will save everybody involved a lot of pain.

Steve

WaitForSingleObject problem [modified]

GDavy15-Apr-08 21:03

GDavy

15-Apr-08 21:03

It's not really that hard loading a dll at run time.
Just make sure your function-pointers are correct, and since they provided a sample application you can basically copy-paste the loading of the dll and functions you require. This will save you headaches if they ever send an improved dll, you will not need to rebuild your own application then.

Regards,
Davy

followait15-Apr-08 19:07

followait

15-Apr-08 19:07

There is a wnd with a list ctrl.
And I create a thread (referenced by h) to fill the list ctrl.
And I wrote this:

CMyWnd::OnDestroy()
{
  CWnd::OnDestroy();
  WaitForSingleObject(h,INFINITE);        //blocked here if the list ctrl 
                                          //filling thread is not completed yet.
}

I think CListCtrl uses its owner message loop to do InsertItem, so there should be no problem to block the main wnd's msg loop. Why does it block here?

modified on Wednesday, April 16, 2008 1:56 AM

Stephen Hewitt15-Apr-08 19:16

Stephen Hewitt

15-Apr-08 19:16

Short answer: Because h never becomes signaled.
Longer anwser: You haven't mentioned what h is! Give us a chance!

Steve

Rajkumar R15-Apr-08 19:36

Rajkumar R

15-Apr-08 19:36

followait wrote:
WaitForSingleObject(h,INFINITE);

Assuming h is the handle to the thread that is filling the List items.

followait wrote:
I think CListCtrl uses its owner message loop to do InsertItem

The message loop is in the same thread where the OnDestroy Message is queue as the list control is created in that thread.

followait wrote:
Why does it block here?

It is actually a deadlock as InsertItem sends the message to the List View control and waiting for the message to be processed while the message loop which processes the WM_DESTROY message from the same message queue waiting for the thread that send the message.

followait15-Apr-08 19:56

followait

15-Apr-08 19:56

Thanks, it's helpful.

Could you tell me how to solve the problem?

followait15-Apr-08 20:14

followait

15-Apr-08 20:14

I used the code below instead of WaitForSingleObject, but block when calling WaitForSingleObject

while(TRUE) {
	DWORD result; 
	MSG msg;
	
	result = MsgWaitForMultipleObjects(cnt,h, 
		TRUE,INFINITE,QS_ALLINPUT); 
	
	if (result==(WAIT_OBJECT_0)) {                  //never get here
		break;
	} else if (result=WAIT_OBJECT_0+cnt) { 
		PeekMessage(&msg, NULL,0,0,PM_REMOVE);
		DispatchMessage(&msg); 
	} 
}

How to sovle it?