How to get the HWND under Lazarus

[lu7hz]

Hi,

I do need to port an applications passing to a Windows dll (bass dll) the applications handle thru TApplication.handle property which seems not to exists in Lazarus.

Not really concerned by portability issues as the dll is Win32 anyway.

Any hint?

Thanks in advance, Pedro.

[Jurassic Pork]

hello,
are you using DYNAMIC_BASS.PAS   here

[User137]

You can use TForm.handle.

Also you should only use official header from http://www.un4seen.com/
It is crossplatform and both Delphi and Lazarus compatible.

[DtC17]

Define exactly what you mean with "application handle" ? Application.MainFormHandle exists -- it may suit your purpose.

Windows has a lot of handles (form handles, process handles etc) and most of the time you'll be needing the Handle of your mainform (given above), which is the first one created.

[Timewarp]

TApplication.handle property which seems not to exists in Lazarus.

There is patch attached. http://bugs.freepascal.org/view.php?id=24052

Use that, if form handle doesn't work or exist.

[User137]

Well, i'm not sure what intention of Application.Handle is. If it's like we suspected from original post, that he uses BASS library, it specifically wants window handle. I've used form handle with BASS for long time without issues. I haven't gotten to test what it means by pointer instead of HWND on Linux though... if form handle is compatible with that?
https://code.google.com/p/nxpascal/source/browse/trunk/src/Bass.pas#734

[ChrisF]

As already discussed into the related bug report ( http://bugs.freepascal.org/view.php?id=24052 ), Application.Handle was originatively in Delphi the handle of an hidden window 'owning' all the other -visible- user windows.

In a Windows environment only, of course (i.e. Delphi).

Currently, it seems that even within Delphi this property is -about to be - deprecated.

Concretely, Application.MainForm.Handle should do the trick in -almost- all the cases, if:

-you are in a windows environment,

-your main form has been created (i.e. don't use it inside the oncreate method of your main form -usually Form1-, for instance).

[dorry]

form:
http://bugs.freepascal.org/view.php?id=24052

uses interfacebase;

try below code .
...................
  WidgetSet.AppHandle

.............
for example
ShowWindow(WidgetSet.AppHandle, SW_HIDE); 
it will be hided on taskbar.

WidgetSet.AppHandle equal Application.handle?

[Leledumbo]

WidgetSet.AppHandle equal Application.handle?

Seems not. WidgetSet.AppHandle is the native handle understood by the underlying widgetset, Application.Handle is the handle known by LCL.

[Timewarp]

Application.MainForm.Handle should do the trick in -almost- all the cases

Only one working correctly is WidgetSet.AppHandle, just test example given (in Windows)

[ChrisF]

That's not completely true. You' re focusing upon only one behavior: showing/hiding the application into the Windows taskbar.

But there are a lot of other possible utilizations for such a handle. And for most of them, the handle of the main form is quite sufficient.

BTW, even the case you're talking of is OK with : Application.MainFormOnTaskbar := true (unless you want to hide the application in the taskbar only, while still showing the form(s) on the desktop).

Which is the now by-default value for Delphi applications (see http://docwiki.embarcadero.com/Libraries/XE5/en/Vcl.Forms.TApplication.MainFormOnTaskBar ).