Retrieve message arrival time - C / C++ / MFC Discussion Boards

Peter, Chan1-Jun-07 0:15

1-Jun-07 0:15

I add a button on a dialog form. When the butter is on focus,I pressed the "Enter Key", the click event will be invoked. But if I set button's style "Owner draw", the click event will not be invoked when I pressed "Enter".
Could anyone give me the answer. Why?

Not only button, edit and some other controls seem very strange.

Re: How to control Controls' Enter Event?

Naveen1-Jun-07 1:04

Naveen

1-Jun-07 1:04

The Enter key will be sent to your button only if your button return DLGC_DEFPUSHBUTTON as response to the WM_GETDLGCODE message. When the owner style is set, this value will not be returned by the button. So the solution is to overide th WM_GETDLGCODE message of the button and return the DLGC_DEFPUSHBUTTON in addition to the default values.

like

return CButton::OnGetDlgCode()|DLGC_DEFPUSHBUTTON ;

nave

[OpenedFileFinder]

Re: How to control Controls' Enter Event?

Peter, Chan3-Jun-07 17:05

Peter, Chan

3-Jun-07 17:05

But if I return DLGC_DEFPUSHBUTTON, I can not owner draw its background. Do you have any other better way to handle it.
Thanks a lot.

Re: How to control Controls' Enter Event?

Naveen3-Jun-07 18:06

Naveen

3-Jun-07 18:06

ok ok i missed one point. In addition to the above thing handle the BN_SETSTYLE message( you have to manully add it message map. Class wizrad will not show this message ).

in the mesasge map
ON_MESSAGE( BM_SETSTYLE, OnSetStyle )

The function

LRESULT ButtonEx::OnSetStyle( WPARAM wParam_i, LPARAM lParam_i )<br />
{<br />
        const int ODDBTN_BS_TYPEMASK = 0x0000000FL;<br />
        return DefWindowProc( BM_SETSTYLE, ( wParam_i & ~ODDBTN_BS_TYPEMASK ) | BS_OWNERDRAW, lParam_i );<br />
 }

nave

[OpenedFileFinder]

Re: How to control Controls' Enter Event? [modified]

Peter, Chan3-Jun-07 19:55

Peter, Chan

3-Jun-07 19:55

Ok. Now it works. But I feel a little wonder, what you need to write:
( wParam_i & ~ODDBTN_BS_TYPEMASK ) | BS_OWNERDRAW

why not
BS_OWNERDRAW
or
wParam_i | BS_OWNERDRAW

I still doesn't very clear how to handle edit control's ENTER event.When I set edit's style "multiline", it will accept ENTER event and do the parent Dialog's OnOK() function. But I only want it jump to the next tabstop control or find some function that I can handle the ENTER event.
Thanks for reply.

-- modified at 4:46 Monday 4th June, 2007

Re: How to control Controls' Enter Event?

Naveen6-Jun-07 21:37

Naveen

6-Jun-07 21:37

Peter, Chan wrote:
But I only want it jump to the next tabstop control or find some function that I can handle the ENTER event

You can handle this in the PreTranslateMesage(). Search for PreTranslateMesage in the message board. You can find many solutions.

nave

[OpenedFileFinder]

Re: How to control Controls' Enter Event?

Peter, Chan6-Jun-07 21:46

Peter, Chan

6-Jun-07 21:46

Thanks

Retrieve message arrival time

JulienLemaitre1-Jun-07 0:02

JulienLemaitre

1-Jun-07 0:02

Hi Forum,

I need to retrieve the time at which a message was posted (or at least, when it was first handled by the Windows messaging system) in a Callback function set through MFC's MESSAGE_MAP.

Briefly:
- I have a library sending messages (but I have *no control* over that library, I must use it as it is);
- My class registers a callback for this kind of message through MFC's MESSAGE_MAP;
- This class would like to know when the message was posted.

I know the Windows' GetMessage() function gets a MSG struct with this information, but it's removed when sent to the callback :/
And since I use MFC, I can't call GetMessage() myself, can I ?

And as said above, I can't modify the library to add this information as a parameter (for example in the WPARAM, which is transmitted to the callback).

So, is there another way to retrieve the time of arrival of the messages my class is supposed to handle ?

Thanks a lot,
Julien

Re: Retrieve message arrival time

Arman S.1-Jun-07 0:48

Arman S.

1-Jun-07 0:48

CWnd::GetCurrentMessage

This function returns a pointer to the current MSG structure being processed [by a window]. Call it inside a message handler function only.

--
=====
Arman

problem retrieving domain name [modified]

Moonis Ahmed31-May-07 23:34

Moonis Ahmed

31-May-07 23:34

hi, i am trying to retrieve domain and user name by the following code

#include "windows.h"

LPTSTR lpszSystemInfo; // pointer to system information string
DWORD cchBuff = BUFSIZE; // size of domain name
TCHAR tchBuffer[bufsize]; // buffer for string

lpszSystemInfo = tchBuffer;

// Get machine name
if( GetComputerName(lpszSystemInfo, &cchBuff) )
m_machineName = _bstr_t(lpszSystemInfo);

// Get domain.
cchBuff = BUFSIZE;
if (GetComputerNameEx(ComputerNameDnsDomain, lpszSystemInfo, &cchBuff))
m_domain = _bstr_t(lpszSystemInfo);

// Get user name.

cchBuff = BUFSIZE;
if( GetUserName(lpszSystemInfo, &cchBuff) )
m_osUsername = _bstr_t(lpszSystemInfo);

This is a part of the code.

When i compile it, I get the following error:
error C2065: 'GetComputerNameEx' : undeclared identifier
error C2065: 'ComputerNameDnsDomain' : undeclared identifier

Can anyone help me solve it?

Moonis

-- modified at 21:39 Sunday 3rd June, 2007

Re: problem retrieving domain name

Arman S.31-May-07 23:56

Arman S.

31-May-07 23:56

Please put any code inside < pre>< /pre> tag to view it correctly.
Before including <windows.h> you should define _WIN32_WINNT greater than or equal to 0x500;

#define _WIN32_WINNT 0x0500
#include <windows.h>

--
=====
Arman

Re: problem retrieving domain name

Moonis Ahmed3-Jun-07 15:30

Moonis Ahmed

3-Jun-07 15:30

Hi,
I did the above settings to enable the macro but the problem still persists. Sigh | :sigh:

My modified code is here:

#define _WIN32_WINNT 0x0500
#include "windows.h"
#include "stdio.h"
#include "iostream.h"
#include "tchar.h"

int main()
{
	LPTSTR lpszSystemInfo;// pointer to system information string

	DWORD cchBuff=sizeof(lpszSystemInfo);// size of domain name

	// Get domain.
	if (GetComputerNameEx(ComputerNameDnsDomain, lpszSystemInfo, &cchBuff))
	cout<<"Domain Name is : "<<cchBuff<<endl;

	// Get user name.

    char acUserName[100];
    DWORD nUserName = sizeof(acUserName);
    if (GetUserName(acUserName, &nUserName)) {
        cout << "User name is " << acUserName << "." << endl;
    }
    else {
        cerr << "Failed to lookup user name, error code " <<
                GetLastError() << "." << endl;
    }

	return 0;
}

I am new to VC++ programming so please point out any other errors if there are.

Moonis

Re: problem retrieving domain name

Naveen6-Jun-07 20:26

Naveen

6-Jun-07 20:26

Which version of platform SDK are you using?If not download the latest platform SDK from the microsoft site.

nave

[OpenedFileFinder]

Re: problem retrieving domain name

Moonis Ahmed6-Jun-07 20:31

Moonis Ahmed

6-Jun-07 20:31

Hi,

I am using MS Visual C++ 6.0 running on Windows 2000 Server.
Is the problem related to the above version that i am running?

Moonis

Re: problem retrieving domain name

Naveen6-Jun-07 21:37

Naveen

6-Jun-07 21:37

declaration of this file dosent come with the vc 6. You neeed to download the latest platform SDK

nave

[OpenedFileFinder]

Re: problem retrieving domain name

Naveen31-May-07 23:56

Naveen

31-May-07 23:56

You have to define the _WIN32_WINNT version to 0x0500 or greater. for this Take

project settings->c++->Preprocessor definition.

In that edit box add _WIN32_WINNT=0x0500

nave

[OpenedFileFinder]

Re: problem retrieving domain name

Rajkumar R31-May-07 23:59

Rajkumar R

31-May-07 23:59

Hi,
In the msdn documentation for GetComputerNameEx it is given
"To compile an application that uses this function, define the _WIN32_WINNT macro as 0x0500 or later"
have to confirmed it and it required to include windows.h

dll for loading bitmap

jannathali31-May-07 23:29

jannathali

31-May-07 23:29

hai,
i want to create a dll that loads bitmap.i am a beginner to a dll.anyone please help me. i read http://www.codeproject.com/vbscript/LoadBMPFromDLL.asp".
but they are not giving the vc++ code part .Any please give any basic idea

Re: dll for loading bitmap

Mark Salsbery1-Jun-07 5:56

Mark Salsbery

1-Jun-07 5:56

What's giving you trouble - loading a bitmap or creating a DLL?

Loading a bitmap is the same in a DLL as in an EXE.

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Re: dll for loading bitmap

Hamid_RT1-Jun-07 6:27

Hamid_RT

1-Jun-07 6:27

But why you want to load bitmaps of a dll?

WhiteSky

Memory sharing

anilkrupakar31-May-07 23:22

anilkrupakar

31-May-07 23:22

I am running five instances of an exe simultaneously. will there be any memory sharing or memory over writings. Suppose i have a strcuture in the code . when i am running five instances will the memory allocated for that structure will be different for each instance? i am not not using "new" operator. i am just taking an object for the structure.
ex:
struct sample{
CString name;
};
sample s;

Anil Jillella

Re: Memory sharing

CPallini31-May-07 23:26

CPallini

31-May-07 23:26

anilkrupakar wrote:
I am running five instances of an exe simultaneously. will there be any memory sharing or memory over writings.

No.

anilkrupakar wrote:
Suppose i have a strcuture i the code . when i am running five instances will memory allocated for that structure will be different?

Yes.

You have to explicitely handle shared memory if you need it.
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.

How to authorize a dll loading.

BusaBird31-May-07 23:09

BusaBird

31-May-07 23:09

Hi all,

Is there a way to allow only a specified program to load a dll.

For example: There is a dll called "test.dll" and I don't want other programs loading it except "test.exe". Is there a way to check the caller in dll main function and denide access if the caller is not authorized.

thanks.
Arun

Re: How to authorize a dll loading.

Jeffrey Walton1-Jun-07 7:27

Jeffrey Walton

1-Jun-07 7:27

Hi Toxcct,

toxcct wrote:
that's stupid...

You're not playing well with others in the sandbox...

I've received the same sort of answers before (from PhD's no less). It made no sense because there was no context of the problem domain. What do you know of the OP's problem domain or project requirements? I did not see it in the original post.

Perhaps the OP has developed an RSA Integer Factorization algorithm he wants to use in his work only: the first being his RSA modulous generation program (to test that n = p * q ), and a second to factor other's moduli. In this case he may not want to share the functionality - for example, the NSA[^] has threatened him with bodily harm.

Finally, what if the DLL is actually a resource of custom graphics or messages...

Jeff

Re: How to authorize a dll loading. [modified]

Rajkumar R1-Jun-07 0:12

Rajkumar R

1-Jun-07 0:12

Hi,
I am not sure whether we can deny access to dll using system control.
But you can do that in your way.

For instance if your dll export a function
CYourDllClass *CreateInstance();
and the object it returns is needed for further processing.

you can do this

CYourDllClass *CreateInstance(yourSecurityKey)
{
if (Authorised(yourSecurityKey))
{
return new CYourDllClass();
}
else
{
return NULL;
}
}

Best Regards

-- modified at 6:42 Friday 1st June, 2007

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