Re: CListView with a Timer - C / C++ / MFC Discussion Boards

If I understand your question correctly, what I do is convert the struct into a class and have it inherit CObject as public. Once I do this, if I want the structure to be able to assign the values directly, I make all the values public. Then I make empty constuctor and destructor (unless you want to assign some default values). Then I will use CObArray. With this I can do everything I would do with CByteArray, but with typecasting:

CMyStruct *p = (CMyStruct *) m_array.GetAt(x);

If you wanted to do this cleaner (without the typecasting), you can create a new array class and have it do the typecasting for you, but I don't do this unless someone else will have to maintian the code.

class CMyStruct : public CObject
{
public:
int Val1;
int Val2;
CString Text1;

CMyStruct() {;}
~CMyStruct() {;}
};

I hope this helps.

Leo T. Smith
Senior Programmer/Analyst
Hartwick College

I would use MFC's CPtrArray to store ptrs to your structs.

Thus, if you have two objects of a struct called MyStruct, like this:

MyStruct struct1, struct2;

You can declare a CPtrArray object and then add them like:

CPtrArray m_Array;
m_Array.Add(&struct1);
m_Array.Add(&struct2);

You can get the structs back later like:

MyStruct* pStruct1 = (MyStruct*)m_Array.GetAt(0);
MyStruct* pStruct2 = (MyStruct*)m_Array.GetAt(1);

Hope this helps.

// Fazlul

Get RadVC today! Play RAD in VC++
http://www.capitolsoft.com

CPtrArray takes void *, and you need to cast it yourself every time ? Oh.. the ugliness...

Christian

As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet.

Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.

Actually, you don't need to typecast when you call CPtrArray::Add() method. However, you're right, you need to do that when you get the struct back using GetAt() method.

If typecasting bothers you too much, you can instead use MFC's template class CTypedPtrArray (declared in afxtempl.h). In this case, you don't need to typecast while calling GetAt() method. Here is how this works:

CTypedPtrArray < CPtrArray, MyStruct* > m_Array; 

m_Array.Add(&struct1);
m_Array.Add(&struct2);

// And to get the structs back later:

MyStruct* pStruct1 = m_Array.GetAt(0);
MyStruct* pStruct2 = m_Array.GetAt(1);

// Fazlul

Get RadVC today! Play RAD in VC++
http://www.capitolsoft.com

It doesn't *worry* me, it's just plain ugly IMHO. But I'm an STL zealot, so I'm likely to take a dim view of MFC containers, I guess....

Christian

As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet.

Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.

Yes, it's kinda *religious* Wink | ;)

to talk about the relative advantages (or disadvantages) of using container classes supported by MFC and STL.

I guess, we all showed the original poster various ways of doing the same thing. It's up to him to decide which way to go.

Cheers.

// Fazlul

Get RadVC today! Play RAD in VC++
http://www.capitolsoft.com

How can I use a Timer in a CListView?
(With the Timer I want to update the view)

This should be helpful:

CWnd::SetTimer
UINT SetTimer( UINT nIDEvent, UINT nElapse, void (CALLBACK EXPORT* lpfnTimer)(HWND, UINT, UINT, DWORD) );

Return Value

The timer identifier of the new timer if the function is successful. An application passes this value to the KillTimer member function to kill the timer. Nonzero if successful; otherwise 0.

Parameters

nIDEvent

Specifies a nonzero timer identifier.

nElapse

Specifies the time-out value, in milliseconds.

lpfnTimer

Specifies the address of the application-supplied TimerProc callback function that processes the WM_TIMER messages. If this parameter is NULL, the WM_TIMER messages are placed in the application’s message queue and handled by the CWnd object.

Remarks

Installs a system timer. A time-out value is specified, and every time a time-out occurs, the system posts aWM_TIMER message to the installing application’s message queue or passes the message to an application-defined TimerProc callback function.

The lpfnTimer callback function need not be named TimerProc, but it must be defined as follows:

void CALLBACK EXPORT TimerProc(
HWND hWnd, // handle of CWnd that called SetTimer
UINT nMsg, // WM_TIMER
UINT nIDEvent // timer identification
DWORD dwTime // system time
);

Timers are a limited global resource; therefore it is important that an application check the value returned by the SetTimer member function to verify that a timer is actually available.

Example

// This example shows how to use CWnd::SetTimer, CWnd::KillTimer, and how to handle WM_TIMER messages. A timer is set up to send a WM_TIMER message to the main frame window every 2 seconds in OnStartTimer(). OnStopTimer will stop the timer by calling CWnd::KillTimer. OnTimer was set up through class wizard to handle WM_TIMER messages for the main frame window. In this example the PC speaker will beep every 2 seconds.

void CMainFrame::OnStartTimer()
{
m_nTimer = SetTimer(1, 2000, 0);
}

void CMainFrame::OnStopTimer()
{
KillTimer(m_nTimer);
}

void CMainFrame::OnTimer(UINT nIDEvent)
{
MessageBeep(0xFFFFFFFF); // Beep

// Call base class handler.
CMDIFrameWnd::OnTimer(nIDEvent);
}

Andres Manggini.
Buenos Aires - Argentina.

Hello,

I have the following code to make a push button check box, and it still draws the button as a check box.

// Create an check box push button.
m_blah4.Create(_T("My button"), WS_CHILD|WS_VISIBLE|BS_CHECKBOX|BS_PUSHBUTTON, CRect(10,100,100,130), this, MY_BTN4);

Does anyone have any suggestions, as to what I am doing wrong?

Thanks in advance!! Smile | :)

try adding BS_PUSHLIKE to the style.

// Fazlul

Get RadVC today! Play RAD in VC++
http://www.capitolsoft.com

Excellant that is what I needed!!!

Thanks for your help!!! Smile | :)

Hello all,

Here is my final solution to my original question:

// Create an auto check box.
m_blah4.Create(_T("My button"), WS_CHILD|WS_VISIBLE|BS_PUSHLIKE|BS_AUTOCHECKBOX, CRect(10,100,100,130), this, MY_BTN4);

Now the button works like the push button check box in the resource.
Thanks to all of you who helped me!! Smile | :)

When I do

CSocket sock;
sock.Connect(place_that_doesn't_exist);

Connect waits like half a minute before returning. I could do some kind of multithreading or overlapped IO completion ports (neither of which I have any experience with) but it would work for me just to have it return after a second or two if it can't connect. I was thinking along the lines of something like

sock.SetTimeout(500_milliseconds);
or
setsockopt(sock.m_socket, SO_TIMEOUT, 500_milliseconds);

Any suggestions? Thanks!
- Alex Griffing

I am having trouble with overriding CWndClassInfo in ATL/WTL. I am working to set the cursor for a CListViewCtrl derived class (ListCtrl) to be a cross (IDC_CROSS) and remove the CS_HREDRAW & CS_VREDRAW to eliminate the flicker during resizing (Q183210). I thought I made the appropriate changes (see below) yet the view does not display the cross cursor and the flicker is still present. What else is needed to invoke the ListCtrl::GetWndClassInfo()? Are there examples of what I am trying to do in ATL?

// ListCtrl.h
class ListCtrl : public CWindowImpl<listctrl, clistviewctrl="">
{
public:
ListCtrl();
virtual ~ListCtrl();

BEGIN_MSG_MAP(ListCtrl)
MESSAGE_HANDLER(WM_PAINT, OnPaint)
END_MSG_MAP()

public:
LRESULT OnPaint(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/,
BOOL& /*bHandled*/);

static CWndClassInfo& GetWndClassInfo()
{
static CWndClassInfo wc = {
{
sizeof(WNDCLASSEX),
0,
StartWindowProc,
0, 0, NULL, NULL, NULL, (HBRUSH)(COLOR_WINDOW+1), NULL,
_T("ListCtrl"), NULL
},
NULL, NULL, IDC_CROSS, TRUE, 0, _T("")
};
return wc;
};
};

// Status.cpp
Status::Status()
{
list_view = new ListCtrl;
}

Status::~Status()
{
if (list_view)
delete list_view;
}

HRESULT Status::open(const HWND hWnd)
{
if (list_view) {
RECT rect;
::GetClientRect(hWnd, &rect);

HWND h = list_view->Create(hWnd, rect, _T("ListCtrl"),
WS_CHILD |
WS_VISIBLE |
WS_CLIPSIBLINGS |
WS_CLIPCHILDREN |
LVS_REPORT,
WS_EX_CLIENTEDGE);
return S_OK;
}

How can I access the information about my display? I want to get the HxW pixel settings (i.e. 2048x768) so that I can place my dialogs on the screen (desktop) with minimal overlap.

Also, I have a dual monitor setup and my users may/may not have the same - would this matter in the information retrieved?

Ad-THANKS-vance Poke tongue | ;-P

Johnny

I just can tell you how to get the witdh and height of your screen:

int width = GetSystemMetrics(SM_CXSCREEN);
int height = GetSystemMetrics(SM_CYSCREEN);

regards

How I can disable the item in list control.
Thanks!

Hello, the codegurus around the world.;)

I don't understand cleary what means "disable the item".
But, I guess that you want to make the mouse click on some itme on the list disable?

Maybe, after you subclass CMyListCtrl, and create struct value like ItemProperties,
and keep the record of which index item will be disabled (kill the mouse clicking).

If you disable one all row, colum or one special cell, these are different stories and
you need more codes to do these. Cry | :((

You also add the code to show how this item is disable, and must redraw the index disabled. Cry | :((

But, this kind of the code seems to be very interesting. Roll eyes | :rolleyes:

If someone creates this kind of the control, please post your new class to Codeproject. Cool | :cool:

Have a nice day!

-Masaaki Onishi-

Hi

I want to create a window that will stay on top of the screen. It should be as width as the screen and as height as the taskbar (may have a constant height). The user shouldn't be able to move the bar.

How should I start? Do I need to create deskband, or does a simple dialog based app teh same job?
Any suggestions or links are greatly appreciated Smile | :)

What you want is an app bar. Look up "application desktop toolbars" in MSDN.

--Mike--
http://home.inreach.com/mdunn/
"Listen you footwarriors, can you hold down a bit with the firing? I've just got three impromptu weddings breaking out behind me!" -- Arthur Dent
Heart | [heart]

your

with

and

A dialog based app will work. Just use a CDialog without a caption bar.

/ravi

"There is always one more bug..."
http://www.ravib.com
ravib@ravib.com

This is the article that I used when I wanted to create an desktop appbar.

http://www.microsoft.com/msj/defaulttop.asp?page=/msj/archive/s274.htm

Michael Smile | :)

I am looking for a way to use the TRACE macros without adding MFC to my project. Does anyone have macro definitions to do this?

But if you do wrong, be afraid, for [the one in authority] does not bear the sword for nothing. He is God's servant, an agent of Wrath to bring punishment to the wrongdoer -- Romans 13:4

void RDTrace(const char* fmt, ...)
{
#ifdef _DEBUG
	char buffer[1024];
	va_list argptr;
	va_start(argptr, fmt);
	_vsnprintf(buffer, 1024, fmt, argptr);
	va_end(argptr); 

	OutputDebugString(buffer);
#endif
}

------------------------------
Smaller Animals Software, Inc.
http://www.smalleranimals.com

Thanks Chris, I just about got this far, but where is the OutputDebugString function declared?

I'm currently using <fstream> to dump my TRACE output to a file, but I would prefer it to come into the IDE so I can see it while it runs.

But if you do wrong, be afraid, for [the one in authority] does not bear the sword for nothing. He is God's servant, an agent of Wrath to bring punishment to the wrongdoer -- Romans 13:4