C / C++ / MFC

18-Jan-05 7:33

I've created a UI thread and I want my main app to send a message to it. So in my main app I make a call to PostThreadMessage.

In the message map of my UI thread I have:

<br />
BEGIN_MESSAGE_MAP(CMyThread, CWinThread)<br />
	//}}AFX_MSG_MAP<br />
	ON_THREAD_MESSAGE(UWM_STOPTHREAD, OnStopThread)<br />
END_MESSAGE_MAP()<br />

However when I post my message to the thread it never reaches the OnStopThread function that I created. Also I get an error if my function is set like this:

<br />
LRESULT CMyThread::OnStopThread(WPARAM wParam, LPARAM lParam)<br />
{<br />
	AfxMessageBox("OnStopThread");<br />
	m_sConnectSocket.Close();<br />
	PostMessage(myHandle->m_hWnd,UWM_DISCONNECTED, 0, (LPARAM)&thdID);<br />
	ExitInstance();<br />
	return true;<br />

Where it returns an LRESULT. If I take this out and make it a void then it compiles fine but still does not work.

Here is the error I'm getting:
MyThread.cpp(55) : error C2440: 'static_cast' : cannot convert from 'LRESULT (__thiscall CMyThread::* )(WPARAM,LPARAM)' to 'void (__thiscall CWinThread::* )(WPARAM,LPARAM)'

I'm thinking of just putting a PeekMessage in the PreTranslateMessage and do my calls from here, but from what I've read on flounder.com, this is not a good idea.

Any suggestion please

Thanks

Tom Wright
tawright915@yahoo.com

Re: UI thread question

Serge Krynine18-Jan-05 12:12

Serge Krynine

18-Jan-05 12:12

Tom,

here are two extracts from one of my class (I have removed all unrelated code) that does similar things and works well. Just verify you've got all declarations and definitions right. May be this will help.

Regards,
Serge Krynine

Header File:

class CLogDocument : public CWinThread
{
DECLARE_DYNAMIC(CLogDocument)
enum EThreadMessage
{
WM_ON_LOG_MESSAGE = WM_USER + 1000
};
afx_msg void OnLogMessage(WPARAM nWparam, LPARAM nLparam);
DECLARE_MESSAGE_MAP()
}; // class CLogDocument

Source File:

///////////////////////////////////////////////////////////////////////
IMPLEMENT_DYNAMIC(CLogDocument, CWinThread)

///////////////////////////////////////////////////////////////////////
BEGIN_MESSAGE_MAP(CLogDocument, CWinThread)
ON_THREAD_MESSAGE(EThreadMessage::WM_ON_LOG_MESSAGE, OnLogMessage)
END_MESSAGE_MAP()

///////////////////////////////////////////////////////////////////////
CLogDocument::~CLogDocument()
{
CWinThread::PostThreadMessage(WM_QUIT, 0, 0);
}

///////////////////////////////////////////////////////////////////////
bool CLogDocument::LogMessage(CString const& rstrMessage)
{
DWORD nResult = CWinThread::PostThreadMessage(EThreadMessage::WM_ON_LOG_MESSAGE,
reinterpret_cast<wparam>(pstrMessage),
NULL);
}

///////////////////////////////////////////////////////////////////////
void CLogDocument::OnLogMessage(WPARAM const nWparam, LPARAM const /*nLparam*/)
{
}

Re: UI thread question

Tom Wright19-Jan-05 11:20

How can I affect the result of GetClientRect?

19-Jan-05 11:20

I have mine setup the same way, but it still does not work. The only difference is the way I'm posting my message to my thread...could that be it?

<br />
		if (!PostThreadMessage((DWORD)hdi.lParam, UWM_STOPTHREAD, 0 , 0))<br />
		{<br />
			CString MyMsg;<br />
			MyMsg.Format("Error posting message to thread: %s", m_lClientConn.GetItemText(i, 3));<br />
			AfxMessageBox(MyMsg);<br />
		}<br />

I'm going to try it your way and see if it makes a difference.

Thanks

Tom Wright
tawright915@yahoo.com

Dimitris Vikeloudas18-Jan-05 7:17

Dimitris Vikeloudas

18-Jan-05 7:17

Hi.

In a CScrollView as far as I realised the GetClientRect returns the size of the physical page of the view. Howe can I alter programatically that size? How can I expand the client area to fit a larger design? What will happen with the co-ordinate system and how do I correct it?

Pls help as I am desperate to deliver something Frown | :(

Thanks

Re: How can I affect the result of GetClientRect?

HurricaneFlossie18-Jan-05 8:28

Re: How can I affect the result of GetClientRect?

18-Jan-05 8:28

Try this. Call GetClientRect, alter the coordinates, then call MoveWindow to update.

Some people see things that are and ask, Why? Some people dream of things that never were and ask, Why not? Some people have to go to work and don't have time for all that ...
Author: George Carlin

Shog⁹18-Jan-05 11:32

Shog⁹

18-Jan-05 11:32

What are you trying to accomplish here? If you change the size of your window, the size of the client changes also. By default, the client is the size of the window, less borders, scrollbars, etc. - if you wish to make it smaller, that is possible, but it is not possible for the client area to ever be larger than the size of the window. Seeing as you're working with a CScrollView, you probably want SetScrollSizes() or some such.

Shog⁹

I'm not the Jack of Diamonds... I'm not the six of spades.
I don't know what you thought; I'm not your astronaut...

Subclassing ListBox so as to provide functionality of both single selection and multiple selection list box

Close Network18-Jan-05 6:58

Close Network

18-Jan-05 6:58

Hello

I need a ListBox that will provide functionality of both single selection and multiple selection listboxes. That means I should be able to singly or multiply make selections in a listbox. I develop with Visual c++ 6.0. What would you suggest ? How would one make it ? I need not to play with colors or anything else. Any help would be greatly appreciated.

Nice Ozgurce

Re: Subclassing ListBox so as to provide functionality of both single selection and multiple selection list box

David Crow18-Jan-05 7:07

David Crow

18-Jan-05 7:07

Nice Özgürce wrote:
That means I should be able to singly or multiply make selections in a listbox.

Why the fuss? A multiselect listbox can do both. Otherwise, you'll need to create both controls on the dialog's template and hide/show each accordingly.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: Subclassing ListBox so as to provide functionality of both single selection and multiple selection list box

Close Network18-Jan-05 13:05

Close Network

18-Jan-05 13:05

You are right. I am just a newbie.

I have another simple question which I am sure you could easily give a solution.

suppose ; I have a dialog and on this dialog there is a editbox(say m_edit1) and a button. When I enter some text in this editbox(m_edit1) and push the button, I want this action(buttons onclick event) to create a popup window on which there is an editbox(say m_edit2) to be filled with the information(text, string whatever) sent from the parent dialog(the info provided thru m_edit1).

What should I do ?
Should I declare m_edit1 public, private or what ?
Should I include first class's header file in the popup window ?
What should I write to pass the m_edit1's text into popup's m_edit2.text ?

Thank you for your help

Nice Özgürce

Re: Subclassing ListBox so as to provide functionality of both single selection and multiple selection list box

David Crow19-Jan-05 2:52

David Crow

19-Jan-05 2:52

class dialog2 : CDialog
{
public:
    CString str;
private:
    CEdit edit;
};
 
BOOL dialog2::OnInitDialog()
{
    edit.SetWindowText(str);
}

In the button handler:

dialog2 dlg;
dlg.str = text_from_the_edit_control;
dlg.DoModal();

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: Subclassing ListBox so as to provide functionality of both single selection and multiple selection list box

HurricaneFlossie18-Jan-05 7:32

How to Detect Presence of a Scrollbar

18-Jan-05 7:32

I do that in a dialog I use when sometimes I need to limit the user to one selection. In OnInitDialog, I just add this code based on a parameter which is set by the calling code.

if (m_bSingleSelection)
m_lbxSymbols.ModifyStyle(0, LVS_SINGLESEL);
else
m_lbxSymbols.ModifyStyle(LVS_SINGLESEL, 0);

This will turn multiselect on and off. Set the original style in the resource editor to multiselect.

Some people see things that are and ask, Why? Some people dream of things that never were and ask, Why not? Some people have to go to work and don't have time for all that ...
Author: George Carlin

Performance Graph...

utkumanyaksalak18-Jan-05 6:56

utkumanyaksalak

18-Jan-05 6:56

How can i learn using PerformanceGraph ...it is very important... if you know any document or article!!

HurricaneFlossie18-Jan-05 5:54

18-Jan-05 5:54

This may be a simple question, but I'm having difficulty finding the answer or finding an example. I have a ListViewCtrl in my app, in which I want to expand the last column to be the maximum width without adding a horizontal scroll bar at the bottom. I can set the width properly, when there is no scrollbar, but how can I detect the presence of a scrollbar and adjust my width accordingly? I can use GetSystemMetrics to determine the width of the scrollbar and make the adjustment, if there is a scroll bar. How can I tell?

BTW, this is a non-MFC app. WTL/ATL are being used.

Some people see things that are and ask, Why? Some people dream of things that never were and ask, Why not? Some people have to go to work and don't have time for all that ...
Author: George Carlin

Tom Wright18-Jan-05 10:35

18-Jan-05 10:35

Well not to rub it in, but if you had done it in MFC you could do something as easy as this:

<br />
	m_lClientConn.InsertColumn(0, "Thread ID", LVCFMT_CENTER);<br />
	m_lClientConn.InsertColumn(1, "    IP address     ", LVCFMT_CENTER);<br />
	m_lClientConn.InsertColumn(2, "   Port   ", LVCFMT_CENTER);<br />
	m_lClientConn.InsertColumn(3, "   Agency Alias   ", LVCFMT_CENTER);<br />
	m_lClientConn.InsertColumn(4, "    Status    ", LVCFMT_CENTER);<br />
    m_lClientConn.InsertColumn(5, "Comments", LVCFMT_CENTER);<br />
	m_lClientConn.SetExtendedStyle(LVS_EX_FULLROWSELECT);<br />
	for(int i = 0; i < 6; i++)<br />
	{<br />
		m_lClientConn.SetColumnWidth(i, LVSCW_AUTOSIZE_USEHEADER);<br />
	}<br />
	<br />
<br />

My list control comes out right every time without a scroll bar across the bottom.

Tom Wright
tawright915@yahoo.com

HurricaneFlossie18-Jan-05 11:01

18-Jan-05 11:01

Tom,

I can use LVSCW_AUTOSIZE_USEHEADER with WTL/ATL also, but this only autosizes the column when I doubleclick on the header. Otherwise, the autosize parameter does not do anything. I need it to size the column appropriately on initialization, and after data has been added to the listbox and there may or may not be a vertical scrollbar present.

Maybe I can simulate doubleclicking on the header? Or am I doing something wrong? I'm trying to avoid a horizontal scrollbar across the bottom, by setting the column width just right.

BTW, we are converting our app to ATL/WTL from MFC because of the overhead of MFC. Although this particular piece of functionality is new.

Thanks for the response.

Some people see things that are and ask, Why? Some people dream of things that never were and ask, Why not? Some people have to go to work and don't have time for all that ...
Author: George Carlin

Shog⁹18-Jan-05 10:59

Shog⁹

18-Jan-05 10:59

It's much easier for you to just send a LVM_SETCOLUMNWIDTH message to the control, passing the column number as the first parameter, and LVSCW_AUTOSIZE_USEHEADER as the second (see MSDN). But, in answer to your question, it doesn't matter - scrollbars are generally part of the non-client area of a window, so you can just call GetClientRect() to get the width sans scrollbars (and borders, etc...).

If neither of these works for you, i have some code around somewhere for doing this sort of thing - let me know.

Shog⁹

I'm not the Jack of Diamonds... I'm not the six of spades.
I don't know what you thought; I'm not your astronaut...

HurricaneFlossie18-Jan-05 11:28

18-Jan-05 11:28

Apparently, you can't just set the column width to LVSCW_AUTOSIZE_USEHEADER and expect it to resize as the list control is redrawn. I had to include this line...

ListView_SetColumnWidth(m_lbxSymbols, iCol, LVSCW_AUTOSIZE_USEHEADER);

in the OnInitDialog, OnSize (because the dialog/control is resizable), and after I load data into the list.

I had been under the impression, that this was like a style setting, but I guess it is actually a size value - one that is computed for you and you must set the size whenever the list control changes in size or content.

Thanks for your help.

Susan

Some people see things that are and ask, Why? Some people dream of things that never were and ask, Why not? Some people have to go to work and don't have time for all that ...
Author: George Carlin

Tom Wright18-Jan-05 12:38