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Index > Compiler Internals > initialize structure data

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Treant



Joined: 09 Oct 2009
Posts: 16
Location: Russia
Treant
I initialize data in structure next code for sample:
Code:
wc WNDCLASSEX

mov [wc.cbSize], 48
mov [wc.style], 0
mov [wc.lpfnWndProc], WndProc
mov [wc.cbClsExtra], 0
mov [wc.cbWndExtra], 0
mov [wc.hInstance], 400000h
mov [wc.hIcon], 0
mov [wc.hCursor], 0
mov [wc.hbrBackground], 6
mov [wc.lpszMenuName], 0
mov [wc.lpszClassName], Title
mov [wc.hIconSm], 0    


these instructions can remove if initialize structure field
next code do it:
Code:
wc:
  dd 48
  dd 0
  dd WndProc
  dd 0
  dd 0
  dd 400000h
  dd 0
  dd 0
  dd 6
  dd 0
  dd Title
  dd 0
virtual at wc
  wcex WNDCLASSEX
end virtual
    

also we can initialize structure next:
Code:
struc WNDCLASSEX
{
 .cbSize dd 48
 .style dd 0
 .lpfnWndProc dd WndProc
 .cbClsExtra dd 0
 .cbWndExtra dd 0
 .hInstance dd 400000h
 .hIcon dd 0
 .hCursor dd 0
 .hbrBackground dd 6
 .lpszMenuName dd 0
 .lpszClassName dd Title
 .hIconSm dd 0
}
    

but we can't dinamically change stucture fields values
it would be nice to add dinamically change stucture fields values feature
May be i don't know how do it?
Question
Post 09 Jan 2011, 11:37
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SFeLi



Joined: 03 Nov 2004
Posts: 140
SFeLi
Code:
wc WNDCLASSEX sizeof.WNDCLASSEX,0,WndProc,...    
Post 09 Jan 2011, 12:05
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edfed



Joined: 20 Feb 2006
Posts: 4242
Location: 2018
edfed
structures initialised by code will take more bytes that strcutures initialised by datas.

in the first case, initialisation uses instructions to encode the values
in the second case, datas are still initialised by the data definition directives.

of course, under windows, it is possible to do it both ways, but the more used is the first one, via invoke macro.
Post 09 Jan 2011, 13:33
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