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Software Development > C++ > ShowWindow(hWnd, SW_HIDE); Does not work -- Only with "SW_HIDE" ???
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May 7th, 2008
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ShowWindow(hWnd, SW_HIDE); Does not work -- Only with "SW_HIDE" ???

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Heya i want to use ShowWindow(hWnd, SW_HIDE); to hide some application,

The problem is that the code i wrote works perfectly for any application except the one i need it for

heres the code

C++ Syntax (Toggle Plain Text)
  1. HWND hWnd = FindWindow(NULL, sName);
  2. if(hWnd)
  3. {
  4. 	ShowWindow(hWnd, SW_HIDE);
  5. }

it does execute the line "ShowWindow(hWnd, SW_HIDE);" but it has no affect on the application, while if i put "SW_MAXIMIZE" , "SW_MINIMIZE" or any other "SW_***" it works perfectly and does manipulation on the application window,

Any idea why SW_HIDE does not work while all other SW_*** works?


Thanks Ahead....
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vedmack is offline Offline
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May 7th, 2008
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Re: ShowWindow(hWnd, SW_HIDE); Does not work -- Only with "SW_HIDE" ???

Try calling ShowWindow twice, according to MSDN the second parameter to ShowWindow() might get ignored the first time it is called. I don't know if it will work, but its worth a try.
C++ Syntax (Toggle Plain Text)
  1. HWND hWnd = FindWindow(NULL, sName);
  2. if(hWnd)
  3. {
  4. 	ShowWindow(hWnd, SW_HIDE);
  5. 	ShowWindow(hWnd, SW_HIDE);
  6. }
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May 7th, 2008
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Re: ShowWindow(hWnd, SW_HIDE); Does not work -- Only with "SW_HIDE" ???

Click to Expand / Collapse  Quote originally posted by Ancient Dragon ...
Try calling ShowWindow twice
Is it a joke ?!
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marco93 is offline Offline
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May 7th, 2008
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Re: ShowWindow(hWnd, SW_HIDE); Does not work -- Only with "SW_HIDE" ???

Does it happens with all the Windows or with any specefic Window ?
Are you trying to hide any window which you have created or any other applciaiton's Window ?
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dubeyprateek is offline Offline
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May 7th, 2008
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Re: ShowWindow(hWnd, SW_HIDE); Does not work -- Only with "SW_HIDE" ???

The WM_SHOWWINDOW message is sent to a window when the window is about to be hidden or shown.

I suspect the window you are trying to hide processes this message and prevents itself from hiding.

You might use Spy++ to see wheather or not this notification is send to the target Window.
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May 7th, 2008
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Re: ShowWindow(hWnd, SW_HIDE); Does not work -- Only with "SW_HIDE" ???

Click to Expand / Collapse  Quote originally posted by marco93 ...
Is it a joke ?!
No. Did you read the link I posted? MSDN says the first time ShowWindow is called SW_HIDE might be ignored. After that SW_HIDE parameter is honored.
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May 8th, 2008
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Re: ShowWindow(hWnd, SW_HIDE); Does not work -- Only with "SW_HIDE" ???

thx 4 the help Ancient Dragon, i will try it and will post the results...
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May 11th, 2008
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Re: ShowWindow(hWnd, SW_HIDE); Does not work -- Only with "SW_HIDE" ???

Hi again... I found the solution...

1)This phenomenon happens with only one specific window...

2)To force this window to hide I do need call the "ShowWindow(hWnd, SW_HIDE);" Twice in the following way:

C++ Syntax (Toggle Plain Text)
  1. myClass::FocusP(str);
  2. myClass::Hidep(str);
  3. ...
  4. ...
  5. ...
  6. void myClass::FocusP(CString str)
  7. {
  8. 	HWND hWnd = FindWindow(NULL, str);
  9. 	if(hWnd){
  10. 		ShowWindow(hWnd, SW_MINIMIZE);
  11. 		ShowWindow(hWnd, SW_HIDE);
  12.  
  13. 	}
  14. }
  15.  
  16. void myClass::Hidep(CString str)
  17. {
  18. 	HWND hWnd = FindWindow(NULL, str);
  19. 	if(hWnd){
  20. 		ShowWindow(hWnd, SW_HIDE);
  21. 	}
  22. }

I could call twice the myClass::FocusP(str); twice, but i prefered to split it... looks better IMO


Thx 4 the help Ancient Dragon and others...
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