C / C++ / MFC

18-Mar-02 8:53

Todd Smith wrote:
I'm a little confused with that ,0 in there. What does that expression evaluate to?

This evaluates to zero. Generally, the value of (x,y) is y. For more info, search the help for 'comma operator'.

Tomasz Sowinski -- http://www.shooltz.com

Re: Assert madness

Todd Smith18-Mar-02 9:30

Todd Smith

18-Mar-02 9:30

Then it appears that the Ignore button on the assert dialog does not work.

#include <assert.h>
#include <stdio.h>

int main(int argc, char* argv[])
{
	assert(false);
	
	printf("ignore assert works!");

	return 0;
}

That just exits when I click on Ignore. *sigh*

I guess I should be using _CrtDbgReport to assert instead.

Todd Smith
CPUA 0x007 ... shaken not stirred

Re: Assert madness

Tomasz Sowinski18-Mar-02 9:55

template class on CWinThread

18-Mar-02 9:55

Basically, you can ignore the 'Ignore' button. Smile | :)

It's probably there because there's only MB_ABORTRETRYIGNORE - you'll not find MB_ABORTRETRY.

_assert() calls abort() which aborts the program (Abort/Ignore) or transfers control to the debugger (Retry).

Tomasz Sowinski -- http://www.shooltz.com

18-Mar-02 8:30

I'm tring to make a template class as follows:

template <class t=""> class x1 : public CWinThread
{
DECLARE_DYNCREATE(x1)

.
.
.
}

In the CPP file on the IMPLEMENT_DYNCREATE( x1, CWinThread) I get the following errors:

: error C2955: 'x1' : use of class template requires template argument list
: error C2512: 'x1<t>' : no appropriate default constructor available

I've tried a few things but cant get this thing to compile. Is it futile to try and make a template on an MFC class?

Thanks.

Re: template class on CWinThread

Tomasz Sowinski18-Mar-02 8:49

How to use WM_WTSSESSION_CHANGE?

18-Mar-02 8:49

Sorry - DECLARE_xxx/IMPLEMENT_xxx are not suitable for templates. These macros use ## (token paste) preprocessor operator to declare a static member of your class which has a name like classCYourClass (assuming that you've used DECLARE_DYNAMIC(CYourClass)). This approach fails for templates - you can't have a C++ identifier with a name like 'classCYourClass<X>'

So you can derive a template class from MFC classes, but you have to give up DECLARE_xxx/IMPLEMENT_xxx - which is often painless.

Tomasz Sowinski -- http://www.shooltz.com

WookMaster18-Mar-02 7:11

18-Mar-02 7:11

I'm writing an app that needs to know when someone logs on or logs off. I used GetSafeHwnd() to send WTSRegisterSessionNotification the window I was using. YOu can find all the info for it here http://msdn.microsoft.com/library/default.asp?url=/library/en-us/termserv/tsref_8d66.asp

Now they say I can use http://msdn.microsoft.com/library/default.asp?url=/library/en-us/termserv/tsref_7fvp.asp WM_WTSSESSION_CHANGE
to recieve the messages through the windowproc
LRESULT CALLBACK WindowProc(
HWND hWnd,
UINT uMsg,
WPARAM wParam,
LPARAM lParam
);

now, how in the world do I use this? I have absolutely no idea how to use this with windowproc

thx

I can imagine a world without war and hate, I can imagine us attacking that world because they'd never expect it.

Tomasz Sowinski18-Mar-02 7:18

18-Mar-02 7:18

This just means that your window will get WM_WTSSESSION_CHANGE. You pass its hwnd to WTSRegisterSessionNotification.

Tomasz Sowinski -- http://www.shooltz.com

WookMaster18-Mar-02 7:27

18-Mar-02 7:27

I need to know how to get the messages when they are sent out, I can see what it does I just don't know how to get or when to get the message for the notification

I can imagine a world without war and hate, I can imagine us attacking that world because they'd never expect it.

Tomasz Sowinski18-Mar-02 7:29

18-Mar-02 7:29

If you call WTSRegisterSessionNotification and window handle, this window will receive WM_WTSSESSION_CHANGE when session status changes. The message is sent by Windows Terminal Services to window you've registered with WTSRegisterSessionNotification. When window receives the message - its windowproc is called.

If you're using MFC, you'll have to add

ON_MESSAGE(WM_WTSSESSION_CHANGE, OnWtsSessionChange)

to the message map. OnWtsSessionChange is the message handler - inside this function you can do whatever you need to handle the session change notification.

Tomasz Sowinski -- http://www.shooltz.com

WookMaster18-Mar-02 7:40

18-Mar-02 7:40

so the OnWTSsessionchange is the message? I could use something like myvariable = ON_MESSAGE(WM_WTSSESSION_CHANGE, ONWTSSESSIONCHANGE); then check for the messages?

I can imagine a world without war and hate, I can imagine us attacking that world because they'd never expect it.

Tomasz Sowinski18-Mar-02 7:38

18-Mar-02 7:38

No. The message is WM_WTSSESSION_CHANGE. OnWTSsessionchange is a member function of your CWnd-derived class. This function will be called when session status changes.

It's just like WM_SIZE and OnSize. Wink | ;)

Tomasz Sowinski -- http://www.shooltz.com

WookMaster18-Mar-02 7:48

18-Mar-02 7:48

ok so that calls the function when theres a session change? How do I get the message? one of these messages is supposed to be sent

WTS_CONSOLE_CONNECT A session was connected to the console session.
WTS_CONSOLE_DISCONNECT A session was disconnected from the console session.
WTS_REMOTE_CONNECT A session was connected to the remote session.
WTS_REMOTE_DISCONNECT A session was disconnected from the remote session.
WTS_SESSION_LOGON A user has logged on to the session.
WTS_SESSION_LOGOFF A user has logged off the session.
WTS_SESSION_LOCK A session has been locked.
WTS_SESSION_UNLOCK A session has been unlocked.
WTS_SESSION_REMOTE_CONTROL

I can imagine a world without war and hate, I can imagine us attacking that world because they'd never expect it.

Tomasz Sowinski18-Mar-02 7:47

18-Mar-02 7:47

The docs clearly states that WTS_xxx gets passed in wParam. lParam is the pointer to WTSSESSION_NOTIFICATION structure.

Tomasz Sowinski -- http://www.shooltz.com