C / C++ / MFC

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.

Naveen1-Jun-07 1:04

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

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Peter, Chan3-Jun-07 17:05

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.

Naveen3-Jun-07 18:06

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

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

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Peter, Chan3-Jun-07 19:55

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

Naveen6-Jun-07 21:37

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

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Peter, Chan6-Jun-07 21:46

Retrieve message arrival time

6-Jun-07 21:46

Thanks

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

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

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

Naveen6-Jun-07 20:26

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

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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

Naveen6-Jun-07 21:37

6-Jun-07 21:37

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

nave

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Naveen31-May-07 23:56

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

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