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Corroder
Grandmaster Cheater Supreme
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Joined: 10 Apr 2015
Posts: 1668
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 Posted: Fri Oct 30, 2020 9:08 pm Post subject: GetComboBoxInfo and COMBOBOXINFO structure |
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I am trying to implementation GetComboBoxInfo but I need to understand about COMBOBOXINFO structure.
1. Is create COMBOBOXINFO structure in CE Lua by using Lua table or memory stream?. The structure of COMBOBOXINFO is:
| Code: | COMBOBOXINFO {
DWORD cbSize;
RECT rcItem;
RECT rcButton;
DWORD stateButton;
HWND hwndCombo;
HWND hwndItem;
HWND hwndList;
} |
2. Since I found a statement in a script said 'blabla.cbSize := sizeof(blabla), I think the COMBOBOXINFO structure is creating using memory stream if write in CE Lua, isn't right?.
3. How to properly writing COMBOBOXINFO structure (as pointer) in CE Lua?,
Regards,
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Dark Byte
Site Admin
 Reputation: 471
Joined: 09 May 2003
Posts: 25832
Location: The netherlands
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| Posted: Sat Oct 31, 2020 1:36 am Post subject: |
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yes, use a memorystream.
you can use memorystreamobject.Memory to get the pointer ti the data
Look at msdn and c headers on how to fill it.
dword can be written with writeDword
rect is just 4 dwords
hwnd is a dword in 32 bit, qword in 64 bit
use stream.position=0 followed by stream.writeDword(stream.Size) to finish it
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Corroder
Grandmaster Cheater Supreme
Reputation: 75
Joined: 10 Apr 2015
Posts: 1668
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| Posted: Sat Oct 31, 2020 6:25 am Post subject: |
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Thank DB, I tried but seem not work. What I am trying to do is to make combobox with transparent background. It work when I am using Lazarus.
So far I tried:
| Code: | struct = [[
COMBOBOXINFO {
DWORD cbSize; --int32
RECT rcItem; --rect
RECT rcButton; --rect
DWORD stateButton; --flag
HWND hwndCombo; --intptr
HWND hwndItem; --intptr
HWND hwndList; --intptr
]]
rect1 = {}
rect1.left = cb.left
rect1.top = cb.top
rect1.right = cb.width
rect1.bottom = cb.DropDownCount
rect2 = {}
rect2.left = cb.left
rect2.top = cb.top
rect2.right = 200
rect2.bottom = 30
cbinfo = {}
cbinfo.cbSize = 0
cbinfo.rcItem = rect1
cbinfo.rcButton = rect2
cbinfo.stateButton = 0 --> button exist no pressed
cbinfo.hwndCombo = ? --cb.handle
cbinfo.hwndItem = ? --cb.handle
cbinfo.hwndList = ? --cb.handle
theinfo = createMemoryStream()
theinfo.Size = 1024
theinfo.Position = 0
theinfo.write(cbinfo) |
And apply in a function:
| Code: |
cb = createComboBox(f)
cb.setSize(200,30)
cb.setPosition(10,10)
cb.DropDownCount = 8
cb.Style = 'csDropDownList'
function cbTransparent(val)
local h, c, dc, check
if c1.Checked then check = 0 else check = 1 end
theinfo.cbSize = theinfo.writeDword(theinfo.Size)
getcomboboxinfo(cb.handle, theinfo.memory)
h = theinfo.hwndList
dc = getdc(h)
c = getbkcolor(dc)
releasedc(h, dc)
if c2.Checked then
setwindowlong(h,gwl_style, getwindowlong(h, gwl_style) and (not ws_border))
else
setwindowlong(h,gwl_style, getwindowlong(h, gwl_style) or ws_border)
end
setwindowlong(h,gwl_exstyle, getwindowlong(h, gwl_exstyle) or ws_ex_layered);
setlayeredwindowattributes(h, c, val, check+1)
end
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Others winapi functions already made and flag values already set.
I am still browse for easy example but didn't find it yet.
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Dark Byte
Site Admin
Reputation: 471
Joined: 09 May 2003
Posts: 25832
Location: The netherlands
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| Posted: Sat Oct 31, 2020 8:24 am Post subject: |
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stream.write only accepts bytetables , you're not passing one
you need to write using the basic types, writeDword and writeQword
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Corroder
Grandmaster Cheater Supreme
Reputation: 75
Joined: 10 Apr 2015
Posts: 1668
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| Posted: Sat Oct 31, 2020 12:15 pm Post subject: |
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Ok, I will try again. Thanks DB
EDIT:
I tried with another method to get handle of Combobox listbox but seem setWindowLong, getWindowLong or SetLayeredWindowAttributes (winapi), not work to make combobox listbox transparent. FindWindowEx and SetWindowText (winapi) just work fine.
I am also note this work on windows xp. But the method is work when use on lazarus on windows 64 bit.
| Code: | GWL_EXSTYLE = -20
LWA_ALPHA = 0x2
WS_EX_LAYERED = 0x80000
CB_ADDSTRING = 0x143
CB_SETITEMDATA = 0x151
function test()
h = FindWindowEx(cb.handle, 0, 0, 0)
SetWindowText(h, "FindWindowEx found it!")
_SendMessage(cb.handle, CB_ADDSTRING, 0, "GetComboBoxInfo: List handle is "..tostring(h))
SetWindowText(h, "FindWindowEx found it!")
dc = getDC(h)
c = GetBkColor(dc)
ReleaseDC(h, dc)
SetWindowLong(h, GWL_EXSTYLE, GetWindowLong(h, GWL_EXSTYLE) or WS_EX_LAYERED)
SetLayeredWindowAttributes(h, c, 0, 0x2)
end
test() |
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