C / C++ / MFC

1-Apr-09 5:22

When I export a class in a DLL, I'm not actually dealing with dllmain or those DLL_PROCESS_ATTACH , DETACH thing. I just simply export it as a class. Then how things work without implementing these?

led mike1-Apr-09 5:27

1-Apr-09 5:27

grassrootkit wrote:
Then how things work without implementing these?

That depends. If, for example, your DLL was using COM and your host wasn't, it wouldn't work if you didn't handle the thread attach event and initialize COM. All the COM calls would fail because that's how COM works. So it depends on what you are doing in your DLL. In other words all DLL's are not equal.

grassrootkit1-Apr-09 5:35

1-Apr-09 5:35

So it should concern us only if we are dealing with COM?

led mike1-Apr-09 5:43

1-Apr-09 5:43

Really? That's your interpretation of my post?

good luck

grassrootkit1-Apr-09 6:15

1-Apr-09 6:15

your DLL was using COM and your host wasn't, it wouldn't work if you didn't handle the thread attach event and initialize COM.

You mean "if my DLL is a COM dll" and the hosting application not using COM? Confused | :confused:

I'm really not able to follow you. Can you explain a bit more without taking out the stick?

led mike1-Apr-09 7:33

1-Apr-09 7:33

grassrootkit wrote:
Can you explain a bit more

Um I already did explain more, maybe you missed those parts?

led mike wrote:
That depends.

led mike wrote:
If, for example, your DLL was using COM

led mike wrote:
because that's how COM works.

led mike wrote:
So it depends on what you are doing in your DLL.

led mike wrote:
In other words all DLL's are not equal.

By the way, that's not a stick, that's just quoting what I already posted.

grassrootkit1-Apr-09 8:25

1-Apr-09 8:25

led mike wrote:
In other words all DLL's are not equal.

I just asked I should take care of dllmain when I'm writing a simple C++ exported class. And you replied with reference to COM! That was little vague or may be I couldn't follow your language. That's why I asked the question again but anyway Cedric moonen got it quite right.

led mike1-Apr-09 9:31

1-Apr-09 9:31

grassrootkit wrote:
Cedric moonen got it quite right.

Cedric Moonen wrote:
But for a plain dll (not COM), you don't have to do anything in them

No, that is not correct.

In a "not COM" DLL you don't have to initialize COM, but you may need to do something else, DEPENDING ON WHAT THE FRACK YOU ARE DOING IN YOUR DLL!!!!

There is no way to make that point more clear. If you can't understand it, you should change careers.

BTW, I find your refusal to read what I post in reply to your question, very rude. Therefore I don't give a rats ass what you think is rude. Get it? Got it? Good.

bulg1-Apr-09 10:48

bulg

1-Apr-09 10:48

Having a bad day?

led mike1-Apr-09 11:12

1-Apr-09 11:12

Was I talking to you? Well now I am so f*** off a**hole

CPallini1-Apr-09 11:13

CPallini

1-Apr-09 11:13

Actually he was pretty nice today. Never heard about 'Terrible Led Mike' before?
Smile | :)

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

[My articles]

Cedric Moonen1-Apr-09 20:19

Cedric Moonen

1-Apr-09 20:19

led mike wrote:
No, that is not correct.

In a "not COM" DLL you don't have to initialize COM, but you may need to do something else, DEPENDING ON WHAT THE FRACK YOU ARE DOING IN YOUR DLL!!!!

That's what I was saying in my second sentence: you might want to initialize stuff depending on what your dll is doing Smile | :)

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

led mike2-Apr-09 5:34

2-Apr-09 5:34

I know that but the monkey can't seem to understand it.

Changing subjects, the voting in this thread is a perfect example of how off it can be, my actual (and correct) answer to the question get's no votes but my post flaming someone else get's a '5' Laugh | :laugh:

CPallini1-Apr-09 7:52

CPallini

1-Apr-09 7:52

led mike wrote:
Really? That's your interpretation of my post?

Wonderful. Big Grin | :-D

grassrootkit1-Apr-09 8:31

1-Apr-09 8:31

CPallini wrote:
Wonderful.

Q:When I export a class in a DLL, I'm not actually dealing with dllmain or those DLL_PROCESS_ATTACH , DETACH thing. I just simply export it as a class. Then how things work without implementing these?

A:That depends. If, for example, your DLL was using COM and your host wasn't, it wouldn't work if you didn't handle the thread attach event and initialize COM. All the COM calls would fail because that's how COM works. So it depends on what you are doing in your DLL. In other words all DLL's are not equal.

Q:So it should concern us only if we are dealing with COM?

*:Really? That's your interpretation of my post?

What's there for you to wonder so much? Don't expect everybody to know everything. I haven't worked with COM. That's why I asked the question that way. I found his reply a bit rude. Now yours is a bit worse. If Cedric Moonen can get question my right why can't you?

CPallini1-Apr-09 8:56

CPallini

1-Apr-09 8:56

He made an example, you didn't understand it was just an example.
For a better understanding see [^].
Smile | :)

grassrootkit1-Apr-09 8:44

1-Apr-09 8:44

So it should concern us only if we are dealing with COM?

May be I should have rephrased that as:
"We don't need to worry if we are just exporting a class."

Re: DLL basic question [modified]

Cedric Moonen1-Apr-09 7:20

Cedric Moonen

1-Apr-09 7:20

The functions are always called. But for a plain dll (not COM), you don't have to do anything in them. However, you could do some initialization and clean-up stuff but that's up to you.

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

grassrootkit1-Apr-09 8:17

Problem creating a simple DLL in c++

1-Apr-09 8:17

Thanks! This is what I asked. Excellent. Straight forward & a neat reply.

modified on Wednesday, April 1, 2009 2:36 PM

snouto1-Apr-09 5:14

snouto

1-Apr-09 5:14

i need to create a simple win32 dll in microsoft .net studio , i tried merely of times

i build everything successfully but in the debug folder there is no file with .dll extension

how can i build the dll successfully ?

is there anybody to help me please

i got these files in the debug folder

helloworld.obj
helloworld.bla bla .manifest

and other files but there is no .dll file?

how can i generate that please help

Human knowledge belongs to the world.

Re: Problem creating a simple DLL in c++

coderormnger1-Apr-09 5:16

coderormnger

1-Apr-09 5:16

you can see the outPut path of project.

Re: Problem creating a simple DLL in c++

grassrootkit1-Apr-09 5:23