C / C++ / MFC Discussion Boards

bisserke1-Jul-02 3:56

1-Jul-02 3:56

I'm looking for a decent DialogBar HOWTO.
Need a kind of tool window like those neat panels from macromedia.
I know it can be done with a CDialogBar and with dockable disabled.

It aint so hard to for a single dialog, but i want to use tabs. I cant get it done, so ...

Anybody got an idea how to get the job done, where to find a decent HOWTO ?

ps. i'm quite new to MFC thus... keep answers not too technical Confused | :confused:

thx all

I used to have a life ... now I have a computer

Re: Need a DialogBar HOWTO

[James Pullicino]1-Jul-02 4:00

[James Pullicino]

1-Jul-02 4:00

Can't you insert a tabctrl in your dlg resource?

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Re: Need a DialogBar HOWTO

bisserke1-Jul-02 4:07

bisserke

1-Jul-02 4:07

sure i can. I aint that dumb.

But i got problems creating child windows.
And catching their messages.

I used to have a life ... now I have a computer

Re: Need a DialogBar HOWTO

[James Pullicino]1-Jul-02 5:15

[James Pullicino]

1-Jul-02 5:15

I don't know about child windows, but catching there messages might involve overrriding the following function: CControlBar::WindowProc()

Check the source code for it and you will see something like this:

<br />
LRESULT CControlBar::WindowProc(UINT nMsg, WPARAM wParam, LPARAM lParam)<br />
{<br />
    ASSERT_VALID(this);<br />
<br />
    // Parent notification messages are just passed to parent of control bar.<br />
    switch (nMsg)<br />
    {<br />
    case WM_COMMAND:<br />
    case WM_DRAWITEM:<br />
    case WM_MEASUREITEM:<br />
    case WM_DELETEITEM:<br />
    case WM_COMPAREITEM:<br />
    case WM_VKEYTOITEM:<br />
    case WM_CHARTOITEM:<br />
        return ::SendMessage(::GetParent(m_hWnd), nMsg, wParam, lParam);<br />
    }<br />
    return CWnd::WindowProc(nMsg, wParam, lParam);<br />
}<br />

Add the desired messages you wish to capture after
case WM_CHARTOITEM:

For more info, search for the following article in the MSDN:

Using CDialogBar in 32-Bit MDI Applications
Nigel Thompson
Microsoft Developer Network Technology Group
Created: September 27, 1994

James

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How do you remove or hide the Menu in an MDI window (CMDIFrameWnd)?

1-Jul-02 3:32

How do you remove (without resulting to error) or hide the Menu in an MDI window (CMDIFrameWnd)?

Re: How do you remove or hide the Menu in an MDI window (CMDIFrameWnd)?

[James Pullicino]1-Jul-02 4:06

[James Pullicino]

1-Jul-02 4:06

Have you tried deleting each menu item one by one?

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Re: How do you remove or hide the Menu in an MDI window (CMDIFrameWnd)?

1-Jul-02 5:46

No I haven't tried that, but will try.

Got a solution though: I am currently trying to set the Menu of the Main Frame Window menu to NULL:

////
BOOL CMainFrame::OnEraseBkgnd(CDC* pDC)
{
// TODO: Add your message handler code here and/or call default

if (GetMenu ())
SetMenu (NULL);

return CMDIFrameWnd::OnEraseBkgnd(pDC);
}
////

It works.. except sometimes there are some minor flicker when adding or closing child windows.

Other ideas are much appreciated Smile | :)

Thanks.

dialog from property sheet? (newbie)

1-Jul-02 3:09

I have a property sheet, which I added a button.
The button brings up a modeless dialog, using the Visual C++'s sample modeless code. The dialog is never visually created, but successfully returns from the Create call (i.e., 1).

m_pCrowsFeet_modeless = NULL;
if (m_pCrowsFeet_modeless == NULL){
m_pCrowsFeet_modeless = new CrowsFeet_Dlg(this);
BOOL dana1 = m_pCrowsFeet_modeless->Create();
if (dana1 == TRUE)
GetDlgItem(IDOK)->EnableWindow(FALSE);
}
else
m_pCrowsFeet_modeless->SetActiveWindow();

The value of dana1 from the Create is 1. But the error occurs when
EnableWindow(FALSE) is invoked. That is the ASSERT(::IsWindow(m_hWnd) is violated and aborts.

CWnd* CWnd::GetDlgItem(int nID) const
{
ASSERT(::IsWindow(m_hWnd));

if (m_pCtrlCont == NULL)
return CWnd::FromHandle(::GetDlgItem(m_hWnd, nID));
else
return m_pCtrlCont->GetDlgItem(nID);
}

The dialog works when called from an application, but not from a property sheet.

Is not a property derived from Cwnd and therefore an IsWindow?
The this from the dialog code does not appear to have a m_hWnd.
Is this true of a propertysheet?

Although the same parent is used to create a window

BOOL ret = Create(NULL, windowName, WS_OVERLAPPEDWINDOW | WS_VSCROLL,
CRect(10,10,300,400), parent, 0);

Thanks, dana

Re: dialog from property sheet? (newbie)

Prem Kumar1-Jul-02 4:47

Prem Kumar

1-Jul-02 4:47

try removing the 'this' in the line

m_pCrowsFeet_modeless = new CrowsFeet_Dlg(this);

and then see.

Attach to process

Hans Ruck1-Jul-02 2:53

Hans Ruck

1-Jul-02 2:53

I click Build/Start Debug/Attach to process. Normally i must get the processes list as i can choose something from it. But the list is empty.
Do you know how could i bring the PIDs into the list?

rechi

Re: Attach to process

Hans Ruck1-Jul-02 3:14

Hans Ruck

1-Jul-02 3:14

This was related to the one below.
The problem will not appear if you don't have any service blocked.

rechi

ATL service stopping

Hans Ruck1-Jul-02 2:19

Hans Ruck

1-Jul-02 2:19

I've created an ATL service. I've started it and it was ok, but the stop action blocked and now the service is in stopping state.
How should i stop the service without reboot?

rechi

Re: ATL service stopping

Christian Graus1-Jul-02 2:27

Christian Graus

1-Jul-02 2:27

You have a problem. I stop mine by killing the process all the time ( as well as in the proscribed manner ) and on the odd case it's done that, I've needed to change and rebuild it.

I don't recall what was wrong.

Christian

I am completely intolerant of stupidity. Stupidity is, of course, anything that doesn't conform to my way of thinking. - Jamie Hale - 29/05/2002

Remember that amateurs built the ark. Professionals built the Titanic.

Re: ATL service stopping

Hans Ruck1-Jul-02 2:36

Hans Ruck

1-Jul-02 2:36

Unfortunately, killing the process is impossible because the access is denied.
I don't know how do you kill your process all the time but anyway i can't do it because i have to unload some resources on processing stop signal.
I will reboot.

rechi

Re: ATL service stopping

Bill Wilson1-Jul-02 9:38

Bill Wilson

1-Jul-02 9:38

From the task manager, choose Debug instead of End Process. Once you are in the debugger, you can kill it with Stop Debugging from the Debug menu.

Thanks for the help,
Bill

How to prevent a CFileDialog Box from resizing?

Erik1-Jul-02 2:06

Erik

1-Jul-02 2:06

Hello,

I use an instance of a CFileDialogBox whenever a user saves or loads a file in my application. For some reason, I need the Dialog Box to be a fixed size when loading files, since I have implemented some additional preview features to that box.

However, when a user selects the "save as" CFileDialogBox (which is another instance, of course), and resizes that box, windows somehow saves the size of that Dialog box. When the user now tries to load a file, that instance of CFileDialogBox is displayed at exactly the same size the Save-As Box was resized to.

Why does windows memorize the size of the dialog, and how can I resize the next instance of CFileDialog to its default value (i.e. the value it uses when I start my application)?

I would like to prevent that behaviour, always displaying my File-Open box at the system default standard size. Any suggestions on how to achieve this?

TIA,

Erik.

Re: How to prevent a CFileDialog Box from resizing?

Prem Kumar1-Jul-02 4:51

Prem Kumar

1-Jul-02 4:51

I think you have created your own dialog class deriving
from CFileDialog. You can override the 'OnSize' and
then set what ever size you want and then change the
window style to non-resizable by using
SetWindowLong.

Re: How to prevent a CFileDialog Box from resizing?

Erik1-Jul-02 19:02

Erik

1-Jul-02 19:02

Hi Prem,

I was thinking of that, too. However, how can I determine the original size of the file-open dialog given by the os in my derived class?

TIA,

Erik.

I/O Completion Port

unknown soldier1-Jul-02 0:59

unknown soldier

1-Jul-02 0:59

Worker threads are associated with I/O completion port. Whenever I/O operation completed a thread is invoked. Now when this thread is invoked, how we come to know that which "type" of operation completed whether "read" or write". I think this has to be determined by overlapped structure but i don't know that which "field" of this structure informs about the "type" of operation completed.

Re: I/O Completion Port

Len Holgate1-Jul-02 8:53

Len Holgate

1-Jul-02 8:53

bakhtawar wrote:
Worker threads are associated with I/O completion port. Whenever I/O operation completed a thread is invoked. Now when this thread is invoked, how we come to know that which "type" of operation completed whether "read" or write". I think this has to be determined by overlapped structure but i don't know that which "field" of this structure informs about the "type" of operation completed.

What usually happens is that you don't actually pass only an "overlapped" structure, you pass something that has an overlapped structure in it and also contains other stuff. This allows you to pass anything you like to your thread. Then, once inside your thread you simply convert back from the pointer to the portion of your structure that is an "overlapped" to a pointer to your structure.

If you're using C++ then you might define your overlapped like this:

<br />
class MyOverlapped : public OVERLAPPED<br />
{<br />
   // include your own data here.<br />
};<br />

And then pass it to a read request like this:

<br />
MyOverlapped *pBuffer;<br />
<br />
   if (SOCKET_ERROR == ::WSARecv(<br />
      pSocket->m_socket, <br />
      pBuffer->GetWSABUF(), <br />
      1, <br />
      &dwNumBytes,<br />
      &dwFlags,<br />
      pBuffer, <br />
      NULL))<br />

and retrieve it from

<br />
   MyOverlapped *pBuffer = 0;<br />
<br />
   GetQueuedCompletionStatus(m_iocp, &dwIoSize, (PDWORD_PTR)&pSocket, (OVERLAPPED**)&pBuffer);<br />

See the code for my reusable C++ socket server class for full details.

Len Holgate
www.jetbyte.com
The right code, right now.

High scale chat server

1-Jul-02 0:47

I am looking for any open source project regarding "highly scalable" chat server deleaing with 5000+ clients. No matter it'll be in distributed environment or standalone environment.

If any one knows about such project then please inform me. Also I'll be grateful if some one give me advice for creating a chat server that deals with "large" number of clients. I'll be using I/O completion ports but i want the response time as quick as MSN server when too many clients attached. Infact the server is also linked with database server for providing lists of authorized buddies to clients just like MSN server. Your advice is most welcome.

Re: High scale chat server

benjymous1-Jul-02 2:02

benjymous

1-Jul-02 2:02

IRC? (Using chanserv and nickserv)

--
Help me! I'm turning into a grapefruit!

Re: High scale chat server

Len Holgate1-Jul-02 9:01

Len Holgate

1-Jul-02 9:01

Sunugtufiq Chang wrote:
I am looking for any open source project regarding "highly scalable" chat server deleaing with 5000+ clients. No matter it'll be in distributed environment or standalone environment.

Take a look at my articles on high performance IO completion port based TCP servers. You'll need to make sure that your database IO doesn't happen on your socket IO threads or you'll kill your scalability, but the 2nd article deals with that issue.

You could probably trim some fat from the servers that I present in the article as they're designed for reuse, and that's probably at odds with actually being the fastest possible...

Then, if they you still cant handle the required load with your target hardware you probably need to scale out and use a cluster of machines sharing the one IP address (in the same way that high performance web farms are constructed) but that's left as an exercise for the reader Wink | ;)

Len Holgate
www.jetbyte.com
The right code, right now.

Get code page of exe

ed welch30-Jun-02 23:08

ed welch

30-Jun-02 23:08

The code page that a program uses is specified in the resource file, using the the #pragma code_page() command.
Is there any way of querying this information from the program at run time?

Re: Get code page of exe

Mike Nordell2-Jul-02 7:20

Mike Nordell

2-Jul-02 7:20

Have a look at VERSIONINFO and work your way from there.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.