Question

Termination of a program in memory

Asked by: almiller

I need a way to terminate a running application (a different
one from the one I'm running) which will check if a certain
programming is running, and if so will terminate it.

In other words, I need to find a way to send the WM_CLOSE
message to a specified application in memory.

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Asked On
1998-02-15 at 02:26:45ID10039316
Topic

Delphi Programming

Participating Experts
3
Points
200
Comments
7

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Answers

 

by: ronitPosted on 1998-02-15 at 03:20:34ID: 1359259

To Close a notepad document:
SendMessage(FindWindow('notepad', nil), wm_Destroy, 0, 0);

 

by: mvzPosted on 1998-02-15 at 04:57:51ID: 1359260

You'll first have to know the ClassName of the app you are trying to close. Then use FindWindow to get e handle of the main window. Then you can use SendMessage to send a WM_CLOSE message.

For example with Word 97 (the classname is OpusApp):

var h:Integer;
begin
 h:=FindWindow('OpusApp',nil);
 if h>0 then SendMessage(h,WM_DESTROY,0,0);
end;

Some know class-names are:

Calculator                        "SciCalc"
Notepad                           "Notepad"
Paintbrush (Win3x            "pbParent"
Paint (Win95)                    "MSPaintApp"
Write (Win3x)                    "MSWRITE_MENU"
WordPad (Win95)             "WordPadClass"
Word 2/6/7                        "OpusApp"
Excel 4/5/7                       "XLMAIN"
PowerPoint 4                      "PPApplicationClass"
PowerPoint 7                      "PP7FrameClass"
ToolBook (authoring            "ToolBook"
ToolBook (runtime)                "TBKMain"
Windows Help                     "MS_WINDOC"
WinHelp32 Topic                 "MS_WINDOC_SECONDARY"
File Manager                      "WFS_Frame"
Control Panel                     "CtlPanelClass"
Print Manager                     "PrintManager"
Explore (Win95)                   "ExploreWClass"
Program Manager                   "Progman"
Microsoft Exchange 4.0            "Microsoft Exchange 4.0 Viewer"
Microsoft Internet Explorer 3.0   "IEFrame"
Lotus Organizer 2.1               "TzBook"
Lotus123 5.0                      "123WParent"
Lotus Approach 96                 "ApproachWClass"
Lotus Freelance Graphics 96       "FLWApp"
Lotus ScreenCam 2.1               "ScreenCamMainWnd"
Lotus WordPro 96                  "WordProAppWndNT"

Greetings MvZ

 

by: ronitPosted on 1998-02-15 at 05:05:16ID: 1359261

You can find a class name of any active application by using the Spy program, coming with Delphi.

 

by: almillerPosted on 1998-02-15 at 05:42:25ID: 1359262

Thanks for you answer. This _is_ what I was looking for, but it lacks the ClassName part which mvz commented on.

The two lines of code you wrote work on NotePad but not on anything else. I can only assume it has to do with the ClassName, so I need to know how to find the ClassName without any external programs such as Spy.

 

by: ronitPosted on 1998-02-15 at 05:50:35ID: 1359263

What application you need to close?

 

by: tomerleiPosted on 1998-02-15 at 06:18:02ID: 1359264

how can i close netscape window?

 

by: mvzPosted on 1998-02-15 at 08:33:06ID: 1359265

When you don't know the classname you can use
the Window-name.
If you want to close netscape you can:

procedure TForm1.Button1Click(Sender: TObject);
var cWindow:string;
    h:integer;
begin
 cWindow:='Netscape';
 h:=FindWindow(nil,Pchar(cWindow));
 if h>0 then SendMessage(h,WM_CLOSE,0,0);
end;

Be sure to use the exact windowname. If a document is opened, and the document name is also in the caption, you must provide this whole new caption-name.

You can also find a classname if you know the WindowName, by using this routine:

var cCLassName: PChar;
    cName:string;
    cWindow:string;
    n,h:integer;
begin
 cWindow:='Test.txt - Notepad';           // exact caption
 h:=FindWindow(nil,Pchar(cWindow));
 if h>0 then begin
   GetMem(cCLassName,256);
   try
    n:=GetClassname(h,cCLassName,256);
    if n=0 then ShowMessage('Error')
    else begin
      ShowMessage('Classname is '+cCLassName);
    end;
   finally
    Freemem(cCLassName,256);
   end;
 end else MessageBeep(0);
end;


BTW, you can use EnumWindows function to get a list of
all openend windows.


Greetings,
MvZ

20120131-EE-VQP-002

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