C / C++ / MFC

Re: how to distribute last column of list control to fit into client area?

28-Feb-07 23:08

Try the below code.

CRect ClientRect;<br />
      GetClientRect( &ClientRect );<br />
      CRect LastItemRect;<br />
      int nLastitem = GetHeaderCtrl()->GetItemCount() - 1;<br />
      GetHeaderCtrl()->GetItemRect( nLastitem , &LastItemRect );<br />
      int nNewLength = ClientRect.right - LastItemRect.left  ;<br />
      SetColumnWidth( nLastitem , nNewLength );

nave

rakeshbbaldha28-Feb-07 23:14

rakeshbbaldha

28-Feb-07 23:14

thank you,

can you please reproduce this probelm by using

1> press window key + e
2> go to details view of folder

now see last column here in list.
can we get last column by using getheaderctrl() fn,

now i have to re distribute this space into all column at runtime .

thanks
rakesh

Re: how to distribute last column of list control to fit into client area?

Naveen28-Feb-07 23:40

Re: how to distribute last column of list control to fit into client area?

28-Feb-07 23:40

if you want to equally distribute the column width do as follows..

CRect ClientRect;
GetClientRect( &ClientRect );
CRect LastItemRect;
int nCount = GetHeaderCtrl()->GetItemCount();
int nWidth = ClientRect.Width()/nCount;
for( int nIdx = 0;nIdx < ncount; nIdx++)
{
SetColumnWidth( nIdx , nWidth );
}

nave

rakeshbbaldha1-Mar-07 0:58

rakeshbbaldha

1-Mar-07 0:58

thank you very much

Re: how to distribute last column of list control to fit into client area?

Michael Dunn1-Mar-07 6:00

Michael Dunn

1-Mar-07 6:00

The list will do this for you. Call SetColumnWidth() on the last column and use the LVSCW_AUTOSIZE_USEHEADER flag.

--Mike--
Visual C++ MVP Cool | :cool:

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Derive Class from CTime

e-DJ28-Feb-07 21:46

28-Feb-07 21:46

Hi all,

I want to create a new class derived from CTime.

<br />
class XTime : public CTime  <br />
{<br />
public:<br />
	XTime();<br />
	virtual ~XTime();<br />
<br />
};<br />

then I create a new object

XTime m_Date;

and then I want to initialize my object:

m_Date = NULL;

there is an error when compiling. When I create my object from a normal CTime, everything works.
As far as I learned C++, I can derive a new class and it inherits everything from the base class. But why can't I initialize it? It seems, that the = operator is not working.

Any help?

Juergen

Naveen28-Feb-07 22:32

28-Feb-07 22:32

This is because CTime have a contrcvtor of type CTime(time_t time);

So in the derived class also declare a constructor which accepts a time_t object and simply pass that object to base class.

class XTime : public CTime <br />
{<br />
public:<br />
XTime();<br />
virtual ~XTime();<br />
<br />
XTime( time_t t ):CTime(t)<br />
{<br />
}<br />
<br />
<br />
};

nave

e-DJ28-Feb-07 23:34

28-Feb-07 23:34

Ahh, that helped a lot.

Now I have to find a way to inherit the = operator.

Thanks a lot

Juergen

Naveen1-Mar-07 0:21

1-Mar-07 0:21

e-DJ wrote:
Now I have to find a way to inherit the = operator.

here it is

class XTime : public CTime
{
public:
XTime();
virtual ~XTime();

XTime( time_t t ):CTime(t)
{
}

const XTime& operator=(time_t t)
{
CTime::operator =( t );
return *this;
}

};

nave

e-DJ1-Mar-07 4:19

1-Mar-07 4:19

Aargh,

I use CTime in my application all the time with almost all operators and constructors. When I have to reimplement them all, where is the use in object oriented design. Since I don't want to change these. All I wantetd to change was the behavior of the .Format-Class Member.

I canceled this and will redesign my application.

Juergen

Nibu babu thomas28-Feb-07 22:55

Nibu babu thomas

28-Feb-07 22:55

e-DJ wrote:
It seems, that the = operator is not working.

operator = is not inherited. You should redefine it in your derived class.

Nibu thomas
A Developer

Programming tips[^] My site[^]

e-DJ28-Feb-07 23:48

28-Feb-07 23:48

Since now, I have not been working with operators. So how should my operator= be defined?

Juergen

David Crow1-Mar-07 2:39

David Crow

1-Mar-07 2:39

e-DJ wrote:
I want to create a new class derived from CTime.

Be careful not to get caught in the "is a" vs. "has a" trap.

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

Win Service problem

david bagaturia28-Feb-07 21:38

david bagaturia

28-Feb-07 21:38

Hi all.

I write win service and I have simple code:

<br />
void main(void)<br />
{<br />
  SERVICE_TABLE_ENTRY DispatcherTable[] =<br />
  {<br />
    {<br />
          (LPWSTR)MYServiceName,<br />
          (LPSERVICE_MAIN_FUNCTION)ServiceMain<br />
    },<br />
    {<br />
      NULL,<br />
      NULL<br />
    }<br />
  };<br />
<br />
  printf("Sample of simple service\n(C) D. Bagaturia, 2007, Email: dato_baga@mail.ru\n");<br />
<br />
<br />
  if(!StartServiceCtrlDispatcher(DispatcherTable))<br />
  {<br />
   CloseHandle(hMutex);<br />
    return;<br />
  }<br />
<br />
}<br />

Problem is that: Wen 'ServiceMain' function ends control go to main() function, and wen main() ends program ends, sow I get thet my service works less than second.

I try to write:

<br />
void main(void)<br />
{<br />
  HANDEL hThread;<br />
  SERVICE_TABLE_ENTRY DispatcherTable[] =<br />
  {<br />
    {<br />
          (LPWSTR)MYServiceName,<br />
          (LPSERVICE_MAIN_FUNCTION)ServiceMain<br />
    },<br />
    {<br />
      NULL,<br />
      NULL<br />
    }<br />
  };<br />
<br />
  printf("Sample of simple service\n(C) D. Bagaturia, 2007, Email: dato_baga@mail.ru\n");<br />
<br />
<br />
  if(!StartServiceCtrlDispatcher(DispatcherTable))<br />
  {<br />
   CloseHandle(hMutex);<br />
    return;<br />
  }<br />
<br />
//I add this part<br />
do{<br />
	 GetExitCodeThread(hThread, // some thread <br />
			   lpExitCode);<br />
	 //this thread starts in ServiceMain Function<br />
	 if(*lpExitCode == STILL_ACTIVE)<br />
		 Sleep(150);<br />
	 else<br />
		 break;<br />
		 <br />
  }while(1);<br />
<br />
}<br />

But in this time I get runtime error.
Wen I try to start or stop my service in ServiceManager, I get error message.

I know thet I blocked the service in case two, but I need this service more then 1 second.

Sow I have:
case 1: service runs less 1 second.
case 2: service runs but, it is blocked.

I know that I made som mistake, but whot?

JudyL_MD1-Mar-07 2:44

JudyL_MD

1-Mar-07 2:44

Your original main was correct. The loop should be in the ServiceMain routine. Before entering the loop, your ServiceMain routine should call RegisterServiceCtrlHandlerEx to establish a callback routine for the SCM to call when the OS needs to change the state of your service. Typically, the ControlHandler sets some kind of signal, like an event. The loop in the ServiceMain then periodically checks for that signal.

Judy

david bagaturia1-Mar-07 3:11

david bagaturia

1-Mar-07 3:11

Thanks all for reply, it help me.

I test my service on 'windows service 1998' and I think that my service is 'Ok', but it dont run on this operation system.
I have some manager exe file for this service and I think this exe have problem to 'operation system', sow wen I start service by this manager exe I get error code that service cant start.

Can this be true?

Tahnks again for your reply.

JudyL_MD1-Mar-07 3:45

JudyL_MD

1-Mar-07 3:45

I'm asuming when you say "windows service 1998" that you are refering to Windows 98. I've never even tried to use one under anything earlier the NT4. Also, the MSDN documentation for the service control functions (both those from within the service like StartServiceCtrlDispatcher and those used by the calling program such as StartService) states they are NT4 or higher also. Looks like 98 is out.

Services are not the easiest things to debug. You just can't "start" them in the debugger. I typically put an ASSERT(false) in the very beginning of my _main function to force an exception and then begin debugging from there, putting break points into my ServiceMain function.

From your earlier post, it looks like you haven't done much with services before. Here is a basic outline of what one should look like. Note that I've omitted the error checking.

SERVICE_STATUS_HANDLE glb_sshStatusHandle;
SERVICE_STATUS        glb_ssStatus;

VOID WINAPI MMServiceMain (DWORD dwArgc, LPTSTR *lpszArgv);

DWORD WINAPI MMServiceControl (DWORD dwCtrlCode, DWORD dwEventType,
                               LPVOID lpEventData, LPVOID lpContext);

int _tmain (int argc, TCHAR* argv[], TCHAR* envp[])
{
    SERVICE_TABLE_ENTRY dispatchTable[] = {
        { "MMService", (LPSERVICE_MAIN_FUNCTION) MMServiceMain},
        { NULL, NULL} };

    StartServiceCtrlDispatcher (dispatchTable);
    glb_ssStatus.dwCheckPoint = 0;
    return 0;
}

void WINAPI MMServiceMain (DWORD dwArgc, LPTSTR *lpszArgv)
{
    // entries that never change
    glb_ssStatus.dwServiceType             = SERVICE_WIN32_OWN_PROCESS;
    glb_ssStatus.dwServiceSpecificExitCode = 0;

    // register our service control handler
    glb_sshStatusHandle = RegisterServiceCtrlHandlerEx (
                 "MMService", MMServiceControl, NULL);

    // report the status to the service control manager
    glb_ssStatus.dwControlsAccepted = 0;
    glb_ssStatus.dwCurrentState     = SERVICE_START_PENDING;
    glb_ssStatus.dwWin32ExitCode    = NO_ERROR;
    glb_ssStatus.dwWaitHint         = 5000;
    glb_ssStatus.dwCheckPoint       = glb_ssStatus.dwCheckPoint++;
    SetServiceStatus (glb_sshStatusHandle, &glb_ssStatus);

    // initialize
    if (!Init ()) {
        glb_ssStatus.dwCurrentState  = SERVICE_STOPPED;
        glb_ssStatus.dwWin32ExitCode = NO_ERROR;
        glb_ssStatus.dwWaitHint      = 0;
        glb_ssStatus.dwCheckPoint    = glb_ssStatus.dwCheckPoint++;
        SetServiceStatus (glb_sshStatusHandle, &glb_ssStatus);
        return;
    }

    // report that we are up and running
    glb_ssStatus.dwControlsAccepted = SERVICE_ACCEPT_STOP;
    glb_ssStatus.dwCurrentState     = SERVICE_RUNNING;
    glb_ssStatus.dwWin32ExitCode    = NO_ERROR;
    glb_ssStatus.dwWaitHint         = 0;
    glb_ssStatus.dwCheckPoint       = glb_ssStatus.dwCheckPoint++;
    SetServiceStatus (glb_sshStatusHandle, &glb_ssStatus);

    // Main loop for the service
    Run ();

    // all done
    glb_ssStatus.dwCurrentState  = SERVICE_STOPPED;
    glb_ssStatus.dwWin32ExitCode = NO_ERROR;
    glb_ssStatus.dwWaitHint      = 0;
    glb_ssStatus.dwCheckPoint    = glb_ssStatus.dwCheckPoint++;
    SetServiceStatus (glb_sshStatusHandle, &glb_ssStatus);
    return;
}

DWORD WINAPI MMServiceControl (DWORD dwCtrlCode, DWORD dwEventType,
                               LPVOID lpEventData, LPVOID lpContext)
{
    if (dwCtrlCode == SERVICE_CONTROL_STOP) {
        glb_ssStatus.dwCurrentState  = SERVICE_STOP_PENDING;
        glb_ssStatus.dwWin32ExitCode = NO_ERROR;
        glb_ssStatus.dwWaitHint      = 0;
        glb_ssStatus.dwCheckPoint    = glb_ssStatus.dwCheckPoint++;
        SetServiceStatus (glb_sshStatusHandle, &glb_ssStatus);

        SetEvent (hStopEvent);
        return NO_ERROR;
    }
    else
        return ERROR_CALL_NOT_IMPLEMENTED;
}

bool Init ()
{
    hStopEvent = CreateEvent (NULL, TRUE, FALSE, NULL);
    return true;
}

void Run ()
{
    while (WaitForSingleObject (hStopEvent, 1) != WAIT_OBJECT_0)
    {
        // do your work - check the event if it is long processing
    }

    CloseHandle (hStopEvent);
    return;
}