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Can't grasp basic understanding of SetWindowPos()

 
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albedoa



Joined: 18 May 2008
Posts: 18
PostPosted: Wed Aug 06, 2008 3:37 pm    Post subject: Can't grasp basic understanding of SetWindowPos() Reply with quote
I have just discovered DLLCall, and I read the Microsoft documentation for SetWindowPos() ( http://msdn.microsoft.com/en-us/library/ms633545(VS.85).aspx ), but still don't understand what any of it means. I can see that one of the variables is for the window handle, but I don't know how to get a handle or exactly what it means to be a handle. I'm pretty lost.

Can someone write a simple example of a DLLCall to SetWindowPos() and explain what each particular part is and what it does? I feel as though I could get a grasp on this if it were just explained once.

Thank you!
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BoBo²
Guest
PostPosted: Wed Aug 06, 2008 3:58 pm    Post subject: Reply with quote
ControlGet, hwnd
WinGet, id
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albedoa



Joined: 18 May 2008
Posts: 18
PostPosted: Wed Aug 06, 2008 4:14 pm    Post subject: Reply with quote
I appreciate the attempt at helping me, but my confusion must run a bit deeper than you presume. With what you gave me, I did this:

Code:
WinGet id,, Untitled - Notepad
DllCall("SetWindowPos", "uint", id, "uint", HWND_TOP)


Nothing happened. Shouldn't that send Notepad to the top? I got it to be always on top by doing this:

Code:
WinGet id,, Untitled - Notepad
DllCall("SetWindowPos", "uint", id, "uint", -1)


And then I sent it behind some other windows by doing this:

Code:
WinGet id,, Untitled - Notepad
DllCall("SetWindowPos", "uint", id, "uint", 2)


I am reading the parameter list, but I must be missing something simple. A more thorough walkthrough of any of my examples would make it click.
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Guest
PostPosted: Wed Aug 06, 2008 6:00 pm    Post subject: Reply with quote
Code:
DllCall("SetWindowPos", "uint", hwnd, "uint", HWND_TOP)
MsgBox %Errorlevel%

above code returns A-20 which is

manual wrote:
An (the letter A followed by an integer n): The function was called but was passed too many or too few arguments. "n" is the number of bytes by which the argument list was incorrect. If n is positive, too many arguments (or arguments that were too large) were passed, or the call requires CDecl. If n is negative, too few arguments were passed. This situation should be corrected to ensure reliable operation of the function. The presence of this error may also indicate that an exception occurred, in which case the function returns a blank value.

refer to msdn SetWindowPos() The syntax is
Code:
BOOL SetWindowPos(     
    HWND hWnd,
    HWND hWndInsertAfter,
    int X,
    int Y,
    int cx,
    int cy,
    UINT uFlags
);

you've missed red colored arguments. correct usage of it is

Code:
hwnd := WinExist("ahk_class Notepad") ;get handle
DllCall("SetWindowPos"
, "UInt", hWnd ;handle
, "UInt", 0 ;HWND_TOP
, "Int", 0 ;x
, "Int", 0 ;y
, "Int", 300 ;width
, "Int", 300 ;height
, "UInt", 0x4000) ;SWP_ASYNCWINDOWPOS

when msdn describes arguments such as HWND_TOP and SWP_ASYNCWINDOWPOS you should put the constants behind it.
for example google "#define HWND_TOP" to get the constant of HWND_TOP. in this case the constant for HWND_TOP is 0
however there are handy tools to do this easily such as Easy WinAPI and Win32 Constants
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albedoa



Joined: 18 May 2008
Posts: 18
PostPosted: Wed Aug 06, 2008 7:42 pm    Post subject: Reply with quote
Now I am thinking I am completely lost. Is the code you posted supposed to do something? Because it doesn't on my system.
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Guest
PostPosted: Wed Aug 06, 2008 7:52 pm    Post subject: Reply with quote
open notepad first then run the code
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albedoa



Joined: 18 May 2008
Posts: 18
PostPosted: Wed Aug 06, 2008 7:57 pm    Post subject: Reply with quote
Heh, I did. It must be something simple. This is my code:

Code:
f1::
hWnd := WinExist("ahk_class Notepad") ;get handle
DllCall("SetWindowPos"
, "UInt", hWnd ;handle
, "UInt", 0 ;HWND_TOP
, "Int", 0 ;x
, "Int", 0 ;y
, "Int", 300 ;width
, "Int", 300 ;height
, "UInt", 0x4000) ;SWP_ASYNCWINDOWPOS

return


It does nothing. I can confirm that a handle is stored in hWnd, but the DllCall doesn't do anything.

Edit: Oh hey, that's a lie. It does resize and move the window, but isn't it supposed to reorder it on the Z axis?
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Guest
PostPosted: Wed Aug 06, 2008 8:04 pm    Post subject: Reply with quote
albedoa wrote:
isn't it supposed to reorder it on the Z axis?
No but you can put -1 at hWndInsertAfter to set AlwaysOnTop which brings it to top anyway. otherwise you should call SetWindowLong.
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Guest
PostPosted: Wed Aug 06, 2008 8:06 pm    Post subject: Reply with quote
Anonymous wrote:
you should call SetWindowLong.
i mean SetForegroundWindow
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albedoa



Joined: 18 May 2008
Posts: 18
PostPosted: Wed Aug 06, 2008 8:17 pm    Post subject: Reply with quote
Ah, that's where my confusion lies. Thanks so much for the help. If you read this, can you tell me why the SetWindowPos() pages says:

Quote:

HWND_TOP
Places the window at the top of the Z order.


That's why I thought it was supposed to bring Notepad to the front.
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Guest
PostPosted: Wed Aug 06, 2008 8:36 pm    Post subject: Reply with quote
that means puts the window at the top of Z order except current foreground window. so it'll be the foreground window when current foreground is minimized or gone
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engunneer



Joined: 30 Aug 2005
Posts: 6847
Location: Pacific Northwest, US
PostPosted: Wed Aug 06, 2008 10:17 pm    Post subject: Reply with quote
why are you doing this all inside DllCall? The whole point of AHK is to wrap these dllcalls to make it easier to use. Do the AHK commands not do what you want in this case?
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Common Answers: 1.(Loops, Viruses, etc.) 2. Search 3.RTFM
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albedoa



Joined: 18 May 2008
Posts: 18
PostPosted: Thu Aug 14, 2008 1:29 am    Post subject: Reply with quote
Is there an AHK command to place a window second from the top? I thought my search was extensive.

The DllCall command is specifically for those calls which AHK lacks a command for, no?
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engunneer



Joined: 30 Aug 2005
Posts: 6847
Location: Pacific Northwest, US
PostPosted: Thu Aug 14, 2008 5:30 am    Post subject: Reply with quote
i'm not sure about second from top. we can do top and bottom easily enough. You are correct that if there are no AHK commands, DllCall can usually do it.
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Common Answers: 1.(Loops, Viruses, etc.) 2. Search 3.RTFM
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