How to check if window is hidden or shown

Archive: How to check if window is hidden or shown

Chieftec
24th February 2007 12:48 UTC

How to check if window is hidden or shown
Hi,

I want to ask, how I can check if a window (Field of Install Options) is hidden or shown?

Thanks in advance

Chieftec
25th February 2007 12:36 UTC

Impossible?

Red Wine
25th February 2007 13:46 UTC

I've read your post twice, still I'm not able to figure what exactly you're referring...

Guessing that saying window you mean the instruction EnableWindow and Field of Install Options means a control on a custom page, and probably hidden or shown means enabled or disabled...
Well, this is script depended, you specify in your script under which condition the control needs to be enabled/disabled.

Backland
25th February 2007 14:02 UTC

Chieftec,

If you wish to check if a control is VISIBLE (e.g. if toggled with ShowWindow), you need to test the window's style for the WS_VISIBLE flag.

If you wish to check if a keyboard/mouse input for a control is enabled (e.g. is toggled with EnableWindow), you can test the control for the WS_DISABLED flag.

You can do the checks using the System plugin and calling the GetWindowStyle API, you can use search to find several examples here in the forums.

Chieftec
25th February 2007 18:48 UTC

Originally posted by Backland
If you wish to check if a control is VISIBLE (e.g. if toggled with ShowWindow), you need to test the window's style for the WS_VISIBLE flag.

Thats exactly what I want to do ;)

Originally posted by Backland
You can do the checks using the System plugin and calling the GetWindowStyle API, you can use search to find several examples here in the forums.

I searched the forum, but didn't found examples to GetWindowStyle or WS_VISIBLE.

Backland
25th February 2007 19:44 UTC

Here is an example for getting the style flags of control (by Kichik)

!define GWL_STYLE -16

>!define BS_DEFPUSHBUTTON 1

 

GetDlgItem$0 $HWNDPARENT 1

System::Call "user32::GetWindowLongA(i $0, i ${GWL_STYLE}) i .s"

>Pop $1 

>

I havent got access to NSIS right now to create an example, but you should be able to check for the WS_VISIBLE flag using IntCmp.

Chieftec
26th February 2007 15:04 UTC

I tried to check the window visibility with the code you posted but it doesn't work.


define WS_VISIBLE          0x10000000

  

  InstallOptions::initDialog /NOUNLOAD "$PLUGINSDIR\ioA.ini"

 Pop $0

  

  GetDlgItem$1 $0 1200

  System::Call "user32::GetWindowLongA(i $0, i ${WS_VISIBLE}) i .s"

 Pop $1 

>

I also read and compiled the examples in NSIS\Examples\System ...
I am not well up with System commands.
So can someone write the code checking for the WS_VISIBLE flag for me?

Chieftec
27th February 2007 18:57 UTC

- push :(

kichik
27th February 2007 19:55 UTC

There's IsWindowVisible, so there's no need for GetWindowLong.

StrCpy $0 "some hwnd"
System::Call "user32::IsWindowVisible(i r0)"i.r0
# $0 here is non-zero if the window is visible.

Chieftec
27th February 2007 23:22 UTC

Thank you for your reply ;)
Is this the correct code?


InstallOptions::initDialog /NOUNLOAD "$PLUGINSDIR\ioA.ini"

 Pop $1

 !insertmacro MUI_INSTALLOPTIONS_READ $0 "ioA.ini" "Field 1" "HWND"

  System::Call "user32::IsWindowVisible(i r0)"i.r0

   # $0 here is non-zero if the window is visible.


 MessageBox mb_ok "$0"

Chieftec
1st March 2007 13:35 UTC

The code I posted above, won't work...
Can someone say me what's wrong?

Regards

kichik
1st March 2007 19:41 UTC

That's because `i.r0` should be in the quotes. Little typo of mine...

System::Call "user32::IsWindowVisible(i r0)i.r0"

But even with this change, you'll always get 0 because the custom dialog doesn't show until installOptions::show is called.

There isn't even an option in InstallOptions to hide a control. What exactly are you trying to do?

Chieftec
3rd March 2007 09:13 UTC

Thank, that works ;)

Originally posted by kichik
But even with this change, you'll always get 0 because the custom dialog doesn't show until installOptions::show is called.

installOptions::show is already called when I use the function (yes, in the code I posted above it isn't)

Thanks again :-)