C / C++ / MFC

Re: knowing if window were minimized or maximized using window hooks

27-Feb-08 8:22

hello,
i got an example project from this site that makes window hooks on all windows and add an option at the context menu for traying it.
every window event will fire the following callback function:
LRESULT CALLBACK InitMenuHookProc(int nCode, WPARAM wParam, LPARAM lParam)

I'm needing to do a program that trays windows which title contains "Mozilla Firefox" whenever it's minimized and untrays when it's resized/maximized.

I tried programs like spy++ to get the values of wParam and lParam, but I got completely stuck.

Any help would be appreciated Smile | :)

Best Regards.

led mike27-Feb-08 9:40

Re: knowing if window were minimized or maximized using window hooks

27-Feb-08 9:40

I'm not really sure what you are trying to do but maybe this will help

CBTProc

The CBTProc hook procedure is an application-defined or library-defined callback function used with the SetWindowsHookEx function. The system calls this function before activating, creating, destroying, minimizing, maximizing, moving, or sizing a window; before completing a system command; before removing a mouse or keyboard event from the system message queue; before setting the keyboard focus; or before synchronizing with the system message queue. A computer-based training (CBT) application uses this hook procedure to receive useful notifications from the system. [^]

marcio k wrote:
i got an example project from this site

That's a great way to start something but don't forget the actual Microsoft Documentation.

led mike

marcio kovags27-Feb-08 9:53

Re: knowing if window were minimized or maximized using window hooks

27-Feb-08 9:53

also tried that... i would not be asking at forums before searching in google, msdn, etc, but i could not find much information on the subject.
at the code there is:
CWPSTRUCT *wps = (CWPSTRUCT*)lParam;

so i use

if (wps->message==WM_SIZE) {//here should be another instruction to test if the window has been minimized, maximized or restored }

the part of testing this is what i cannot find Frown | :(

BUT i think i can do a workaround on this using wps->hwnd to determine the hwnd state... just need to look out for the right API for this Smile | :)

sorry for bothering and thanks for the time Smile | :)

led mike27-Feb-08 10:02

Re: knowing if window were minimized or maximized using window hooks

27-Feb-08 10:02

marcio k wrote:
also tried that

and what happened?

led mike

marcio kovags27-Feb-08 10:12

Re: knowing if window were minimized or maximized using window hooks

27-Feb-08 10:12

I could not found much at microsoft documentation... but this workaround fits like a glove for the problem Smile | :)

led mike27-Feb-08 11:38

Re: knowing if window were minimized or maximized using window hooks

27-Feb-08 11:38

marcio k wrote:
but this workaround fits like a glove for the problem

Ah, yes

If it works, do it[^]

led mike

marcio kovags27-Feb-08 14:54

Re: knowing if window were minimized or maximized using window hooks

27-Feb-08 14:54

great pdf!
do someone know any api to get the window state (maximized, minimized, restored) through the hwnd?

thanks Smile | :)

led mike28-Feb-08 6:39

Re: knowing if window were minimized or maximized using window hooks

28-Feb-08 6:39

marcio k wrote:
do someone know any api to get the window state (maximized, minimized, restored) through the hwnd?

Umm yeah, the one I already provided to you does. Confused | :confused:

led mike

marcio kovags1-Mar-08 15:10

Can't create tray icon from modeless dialog

1-Mar-08 15:10

sorry... i was a little "sleep-deprivation drunk" :x

Royce Fickling27-Feb-08 5:44

27-Feb-08 5:44

Hi,

I am trying to create a tray icon. I downloaded Chris Maunder's project and it works for me in my test dialog which is modal. Now I am trying to get it to work in a modeless dialog that ultimately I want to be hidden. I cannot get the tray icon create logic to work. The call to ::Shell_NotifyIcon() fails but I have no idea why. The NOTIFYICONDATA struct seems to be filled in correctly and GetLastError() returns 0. I have tried it with and without a visible modeless dialog. I need the tray icon only to let my user know that my service is running. My code is below:

 <br />
    m_tnd.cbSize = sizeof(NOTIFYICONDATA);<br />
    m_tnd.hWnd   = pParent->GetSafeHwnd()? pParent->GetSafeHwnd() : m_hWnd;<br />
    m_tnd.uID    = uID;<br />
    m_tnd.hIcon  = icon;<br />
    m_tnd.uFlags = NIF_ICON | NIF_TIP;	// NIF_MESSAGE;<br />
    m_tnd.uCallbackMessage = uCallbackMessage;<br />
    _tcscpy(m_tnd.szTip, szToolTip);<br />
<br />
    // Set the tray icon<br />
    VERIFY(m_bEnabled = ::Shell_NotifyIcon(NIM_ADD, &m_tnd));<br />

Any help appreciated

David Crow27-Feb-08 6:01

27-Feb-08 6:01

Why does the dialog need to be modeless?

"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Royce Fickling6-Mar-08 12:11

6-Mar-08 12:11

This dialog must be modeless because it is to be displayed by a Windows service and I don't want my service to hang or be killed by the OS. This dialog will appear only if the user attempts to shutdown the system if my service is still doing critical processing.

led mike7-Mar-08 5:04

7-Mar-08 5:04

Royce Fickling wrote:
This dialog will appear only if the user attempts to shutdown the system if my service is still doing critical processing.

I've written many Services down through the years and never even considered doing something like that. I'm not even sure if it makes sense in the larger scheme of things. I'm also not sure it is supported during shutdown because as I stated I would never even consider doing something like that.

led mike

Mark Salsbery27-Feb-08 6:38

Mark Salsbery

27-Feb-08 6:38

Does GetLastError() give you any useful info?

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

David Crow27-Feb-08 6:44

27-Feb-08 6:44

Not according to his post. I did not find anything on MSDN that says GetLastError() is even used.

Mark Salsbery27-Feb-08 6:52

Mark Salsbery

27-Feb-08 6:52

What do you mean? I meant after the failed Shell_NotifyIcon call.

The docs for Shell_NotifyIcon state:

"You can call GetLastError for more specific information about a failure case."

That's what I meant. But now I see the OP stated it returned 0 D'Oh! | :doh:

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

David Crow27-Feb-08 6:56

27-Feb-08 6:56

What are you doing looking at newer documentation, Mark? D'Oh! | :doh:

Mark Salsbery27-Feb-08 6:59

Mark Salsbery

27-Feb-08 6:59

Heh that's the least of my problems....I need to read the posts more closely! Smile | :)

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

led mike27-Feb-08 6:56

27-Feb-08 6:56

DavidCrow wrote:
I did not find anything on MSDN that says GetLastError() is even used.

WTF David? "You can call GetLastError for more specific information about a failure case."[^]

led mike

David Crow27-Feb-08 7:04

27-Feb-08 7:04

I know that, Mike. I was looking at my Oct '01 copy of MSDN. It's a bit aged.

led mike27-Feb-08 7:34

27-Feb-08 7:34

Sorry, I would not have posted if I had seen Marks, I got web lagged. Rose | [Rose]

led mike

led mike27-Feb-08 6:58

27-Feb-08 6:58

Royce Fickling wrote:
Now I am trying to get it to work in a modeless dialog

When are you running the code you posted?

m_tnd.hWnd = pParent->GetSafeHwnd()? pParent->GetSafeHwnd() : m_hWnd;

I assume a valid HWND is required, have you checked that you have one?

led mike

Royce Fickling6-Mar-08 12:07

6-Mar-08 12:07

Yes, the dialog's hwnd is valid. I have called the icon create method from OnInitDialog() after the CDialog::OnInitDialog() call. I have also called it from OnShowWindow(), but both fail.

Royce Fickling6-Mar-08 14:20