Hi,
Hi all,
As titled, I want to read text content from a standard syslistview32 control
in an application. And the syslistview32 control is not a pop-up but
embedded in the application, which means the control has same process ID as
the application. In that case, I don't have to call VirtualAllocEx or
WriteProcessMemory.
So far, I could successfully get syslistview32 control's handle, count how
many items listed. But still can not read its content. Could you please
tell me how to do it correctly?
require 'Win32API'
findwin = Win32API.new('user32', 'FindWindow', 'PP', 'L')
getdlg = Win32API.new('user32', 'GetDlgItem', 'LL', 'L')
sendmsg = Win32API.new('user32', 'SendMessage', 'LLLP', 'L')
#Some irrelevant details are ignored
#Here I've already got syslistview32 control's handle, let's assume it is
resultslist = 3739380
puts "Count of items = #{sendmsg.call(resultslist, 4100, 0, nil)}"
#LVM_GETITEMCOUNT = 0x1004
puts header = getdlg.call(resultslist, 0).to_s(16).upcase
#No problem, this works
#From here I tried to SendMessage with LVM_GETITEMTEXT parameter to get
syslistview32's content
#Solution I: define a struct as described in MSDN, but something wrong when
I tried to pack, this is due to my lack of knowledge on pack&unpack
LV_item = Struct.new(:mask, :iItem, :iSubItem, :state, :stateMask, :pszText,
:cchTextMax, :iImage, :lParam)
lv_item = LV_item.new()
puts sendmsg.call(resultslist, 4165, 1, lv_item.to_a.pack("p"))
=> return value is 1, success?
puts lv_item.inspect
=> #<struct LV_item mask=nil, iItem=nil, iSubItem=nil, state=nil,
stateMask=nil, pszText=nil, cchTextMax=nil, iImage=nil, lParam=nil>
absolutely not succeed
#If I initiate lv_item = LV_item.new(0, 0, 0, 0, 0, "", 0, 0, ""), then
error occurs at packing: can't convert Fixnum into String (TypeError). Can
I pack integer pointer except pack("p")?
#Solution II: Directly pack an array and pass to SendMessage, return value
is still nil
lv_item = [0, 0, 0, 0, 0, "\000", 0, 0, "\000"]
lv_item = lv_item.pack("IiiIIpiip")
puts sendmsg.call(resultslist, 4165, 1, lv_item)
=> return value is 1, success?
lv_item = lv_item.unpack("IiiIIpiip")
puts lv_item.inspect
=> [0, 0, 0, 0, 0, "\000", 0, 0, "\000"], nothing is padded actually
I really appreciate if you can answer my question, thanks in advance.
Here is a code using VirtualAllocEx and WriteProcessMemory for a
general purpose.
require 'Win32API'
findwin = Win32API.new('user32', 'FindWindow', 'PP', 'L')
getdlg = Win32API.new('user32', 'GetDlgItem', 'LL', 'L')
sendmsg = Win32API.new('user32', 'SendMessage', 'LLLP', 'L')
getWindowThreadProcessId = Win32API.new('user32',
'GetWindowThreadProcessId', 'LP', 'L')
openProcess = Win32API.new('kernel32', 'OpenProcess', 'LIL', 'L')
virtualAllocEx = Win32API.new('kernel32', 'VirtualAllocEx', 'LPLLL', 'L')
virtualFreeEx = Win32API.new('kernel32', 'VirtualFreeEx', 'LLLL', 'L')
writeProcessMemory = Win32API.new('kernel32', 'WriteProcessMemory',
'LLPLP', 'I')
readProcessMemory = Win32API.new('kernel32', 'ReadProcessMemory', 'LLPLP', 'I')
PROCESS_VM_OPERATION = 0x08
PROCESS_VM_READ = 0x10
PROCESS_VM_WRITE = 0x20
PROCESS_QUERY_INFORMATION = 0x400
MEM_COMMIT = 0x1000
MEM_RELEASE = 0x8000
PAGE_READWRITE = 0x04
LVM_GETITEMTEXT = 0x1000+45
LVM_GETITEMCOUNT = 0x1000+4
SIZE_OF_LVITEM = 60
resultslist = 0xB0044 ##<== start with some given handle
count = sendmsg.call(resultslist,LVM_GETITEMCOUNT, 0, nil)
lv_item = [0, 0, 0, 0, 0, nil, 512, 0, 0,0,0,0,0,0,0]
lv_item = lv_item.pack("LiiLLpiiLiiLLLL")
pid = 0.chr*4
getWindowThreadProcessId.call(resultslist, pid)
pid = pid.unpack('L').first
process = openProcess.call(PROCESS_VM_OPERATION|PROCESS_VM_READ|PROCESS_VM_WRITE|PROCESS_QUERY_INFORMATION,0,pid)
_lvi=virtualAllocEx.call(process, nil, SIZE_OF_LVITEM,MEM_COMMIT,
PAGE_READWRITE)
_item=virtualAllocEx.call(process, nil, 512, MEM_COMMIT,PAGE_READWRITE)
_subitem=virtualAllocEx.call(process, nil, 512, MEM_COMMIT,PAGE_READWRITE)
for i in 0..count
lv_item[8,4] = [0].pack('L')
item = 0.chr * 512
lv_item[20,4] = [_item].pack('L')
writeProcessMemory.call(process, _lvi, lv_item, SIZE_OF_LVITEM, nil)
sendmsg.call(resultslist, LVM_GETITEMTEXT, i, _lvi)
subitem = 0.chr * 512
lv_item[8,4] = [1].pack('L')
lv_item[20,4] = [_subitem].pack('L')
writeProcessMemory.call(process, _lvi, lv_item, SIZE_OF_LVITEM, nil)
sendmsg.call(resultslist, LVM_GETITEMTEXT, i, _lvi)
readProcessMemory.call(process, _item, item, 512, nil)
readProcessMemory.call(process, _item, subitem, 512, nil)
item = item.strip!
subitem = subitem.strip!
puts "#{item} - #{subitem}"
end
virtualFreeEx.call(process, _lvi, 0, MEM_RELEASE)
virtualFreeEx.call(process, _item, 0, MEM_RELEASE)
virtualFreeEx.call(process, _subitem, 0, MEM_RELEASE)
Regards,
Park Heesob
···
2010/7/27 Jing Li <thyrlian@gmail.com>:
