Re: calling a static function - C / C++ / MFC Discussion Boards

Joseph Marzbani15-Sep-08 7:22

15-Sep-08 7:22

Hi Masters!
--------------

Could you please tell me what's a Message Only Window and how can I
create one using Pure Win32 APIs?

Thank you in advance ... Blush | :O

Thank you masters!

Re: Message Only Window?

James R. Twine15-Sep-08 7:30

James R. Twine

15-Sep-08 7:30

   A Message Only Window is typically a window that you create that is kept invisible and does not receive any user input. Its sole purpose is to receive window messages.

   You can use the CreateWindow(...) function to create just about any window that you would ever need.

   BTW - I think that there is a special style available in later versions of the Win32 SDK for message-only windows, but I cannot find it now.

   Peace!

-=- James
Please rate this message - let me know if I helped or not!<hr></hr>If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
Remember that Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
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Re: Message Only Window?

auralius manurung15-Sep-08 17:52

auralius manurung

15-Sep-08 17:52

this is what msdn says:

A message-only window enables you to send and receive messages. It is not visible, has no z-order, cannot be enumerated, and does not receive broadcast messages. The window simply dispatches messages.

check it on http://msdn.microsoft.com/en-us/library/ms632599(VS.85).aspx#message_only[^]

Studio Tools - Spy++

john john mackey15-Sep-08 7:20

john john mackey

15-Sep-08 7:20

I need some help interpreting the Spy++ listing of window items...

In the listing of windows, handle values (in HEX), short description, ... all listing in a tree view, is the ordering within a group meaningful?

Let me clarify my question:

I am debugging a huge GUI application and the past developer created most of the buttons on the GUI dynamically (on the fly) using bitmap images and the CButton::CREATE() method(s).

I am using Spy++ to identify some buttons.

If I am looking at the listing of window handles in Spy++, does the order listed reflect the order in which the buttons were created?

I am trying to find a run-away button that is in a place it shouldn't be on the GUI and not controlled (hidden/enabled) when it should be.

Thanks!
John John

RSA Encryption/Decryption

Kdss15-Sep-08 5:28

Kdss

15-Sep-08 5:28

I am working on a program that takes an input of 2 numbers from the user, checks the primality, generates a public and private keys, validates those keys by encrypting text entered by the user and decrypting text entered by the user. Can anyone help me with some code for this project?

Thanks!

Re: RSA Encryption/Decryption

SandipG 15-Sep-08 5:49

SandipG

15-Sep-08 5:49

Did you ask google?
I did and got these links
RSA Algo[^]
RSA Algo[^]

Regards,
Sandip.

calling a static function

steph515-Sep-08 5:26

steph5

15-Sep-08 5:26

Hi
I am looking at someone elses project and source code and seeing something I need explaining!

There is a STATIC member function declared in a class.
eg.
class myClass
{
static void myFunction();
}

Then it is called using the scope resolution opperator.
myClass::myFunction()

but it is being called from another source file in the project!

I can't see any reason why it is aloud to do this. In fact I have added my own class and function
looking exactly the same and it gives me LNK 2019 error.

Any Ideas what I am missing.

Thanks in advance for your time. D'Oh! | :doh:

Re: calling a static function

Mark Salsbery15-Sep-08 5:39

Mark Salsbery

15-Sep-08 5:39

steph5 wrote:
it is being called from another source file in the project!
I can't see any reason why it is aloud to do this.

If it wasn't allowed, then all our source code would
have to be in one file. Thankfully we have a linker
to link separate compiled code modules Smile | :)

steph5 wrote:
In fact I have added my own class and function
looking exactly the same and it gives me LNK 2019 error.

To do its job, the linker needs to know where to find
the code to link to. What's the complete error you're getting?

Mark

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

Re: OT

toxcct15-Sep-08 5:44

toxcct

15-Sep-08 5:44

Mark Salsbery wrote:
If it wasn't allowed

shouldn't it be: "if it weren't allowed" ? Confused | :confused:

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Re: OT

Mark Salsbery15-Sep-08 5:45

Mark Salsbery

15-Sep-08 5:45

Probably.

I'm a software engineer, dammit, not an English professor. Smile | :)

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

Re: OT

toxcct15-Sep-08 5:48

toxcct

15-Sep-08 5:48

f*ck that, i'm french, not a native english speaker (like you) ! lol

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Re: OT

Mark Salsbery15-Sep-08 5:59

Mark Salsbery

15-Sep-08 5:59

toxcct wrote:
not a native english speaker (like you)

LOL! I'm pretty sure the rest of the world doesn't
call what we Americans speak "English" Poke tongue | ;-P

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

Re: OT

john john mackey15-Sep-08 7:24

john john mackey

15-Sep-08 7:24

touché

Re: OT

David Crow15-Sep-08 5:53

David Crow

15-Sep-08 5:53

Not necessarily.

"Love people and use things, not love things and use people." - Unknown

"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch

Re: OT

Mark Salsbery15-Sep-08 6:01

Mark Salsbery

15-Sep-08 6:01

Now that DavidCrow mentions it, and the caffeine is kicking in...

I'm pretty sure I was right Poke tongue | ;-P

LMAO

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

Re: OT

CPallini15-Sep-08 6:10

CPallini

15-Sep-08 6:10

Nope.

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]

Re: OT

toxcct15-Sep-08 7:22

toxcct

15-Sep-08 7:22

you're saying this as if such construction never exists... but I'm sure it is !

for example, the following is perfectly valid : "If I were you, I wouldn't do that"...

Poke tongue | ;-P

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Re: OT

Mark Salsbery15-Sep-08 7:30

Mark Salsbery

15-Sep-08 7:30

Hey tox (aka Grammar Nazi)...

Shouldn't you be busy working on this?[^]

Poke tongue | ;-P

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

Re: OT

toxcct15-Sep-08 7:40

toxcct

15-Sep-08 7:40

Mark, wait.

I didn't say all I write is gramatically correct; I make mistakes sometimes.

BUT, isn't the construction I just asked you in this thread valid ?

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Re: OT

Mark Salsbery15-Sep-08 7:46

Mark Salsbery

15-Sep-08 7:46

I'm just goofin with you here, of course.

toxcct wrote:
isn't the construction I just asked you in this thread valid ?

Where at? I missed something somewhere Smile | :)

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

Re: OT

Mark Salsbery15-Sep-08 7:55

Mark Salsbery

15-Sep-08 7:55

I see it now sorry Smile | :)

Yeah you are right I think. The more I say both versions, yours sounds better.

And using "was" implies past tense which seems silly.

Beer | [beer]

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

Re: OT

CPallini15-Sep-08 7:48

CPallini

15-Sep-08 7:48

And you're right [^]. Anyway it looks like 'wish' is needed in the sentence.

Anyway I'm a poor Italian man...
Big Grin | :-D

Re: calling a static function

steph515-Sep-08 5:58

steph5

15-Sep-08 5:58

Hi I was in the understanding that if you declare a static function it can only be called from the source file where it is declared.
Am I missing something??

The error says "unresolved external symbol"
the call to the function is in file1.cpp where I have:

myClass::myFunction(variable1, variable2);

In myClass.h I have:

class myClass
{
static void myFunction
}

and in myClass.cpp I have the function definition:

myClass::myFunction()
{
//function definition
}

I can't call myFunction from file1.cpp

As you can tell I am a novice programmer and in desperate need of explanation Frown | :(

Re: calling a static function

Mark Salsbery15-Sep-08 6:13

Mark Salsbery

15-Sep-08 6:13

steph5 wrote:
I was in the understanding that if you declare a static function it can only be called from the source file where it is declared.
Am I missing something??

Yes

That would make calling any external functions
impossible.

steph5 wrote:
I can't call myFunction from file1.cpp

The linker can't find myClass.obj.
Is myClass.cpp not part of the project?

Mark

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

Re: calling a static function

CPallini15-Sep-08 6:14

CPallini

15-Sep-08 6:14

steph5 wrote:
I was in the understanding that if you declare a static function it can only be called from the source file where it is declared.

That's true.

steph5 wrote:
Am I missing something??

Yes: in

steph5 wrote:
class myClass
{
static void myFunction
}

is not an ordinary (i.e. C-style) static function, is a static method (i.e is a member of the class even if you don't need an instance of the class to call it).

Smile | :)

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