hola yo mucho no te puedo explicar del tema, pero, como el tema es interesante tambien estoy buscando algo de info, porque quiero obtener el codigo html de el IExplorer para modificarlo y devolverselo, pero bueno todavía no saco nada, te paso dos ejemplo que vale mas que 1000 palabras.
el primero es el del api guide (el que te nombraba Seba123neo)
agrega un Command1
' MaRi� G. Serrano. 16/Abril/2002.-
Private Const PROCESS_ALL_ACCESS As Long = &H1F0FFF
Private Declare Function GetWindowThreadProcessId Lib "user32" (ByVal hWnd As Long, lpdwProcessId As Long) As Long
Private Declare Function OpenProcess Lib "kernel32" (ByVal dwDesiredAccess As Long, ByVal bInheritHandle As Long, ByVal dwProcessId As Long) As Long
Private Declare Function ReadProcessMemory Lib "kernel32" (ByVal hProcess As Long, ByVal lpBaseAddress As Any, lpBuffer As Any, ByVal nSize As Long, lpNumberOfBytesWritten As Long) As Long
Private Declare Function WriteString Lib "kernel32" Alias "WriteProcessMemory" (ByVal hProcess As Long, ByVal lpBaseAddress As Any, ByVal lpBuffer As Any, ByVal nSize As Long, ByVal lpNumberOfBytesWritten As Long) As Long
Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
'Private Declare Function WriteValue Lib "kernel32" Alias "WriteProcessMemory" (ByVal hProcess As Long, ByVal lpBaseAddress As Any, lpBuffer As Any, ByVal nSize As Long, ByVal lpNumberOfBytesWritten As Long) As Long
Private Sub Command1_Click()
Dim str As String, MyString As String
MyString = "HELLO"
'in this case I read the memory of my own process
MsgBox "MyString= " & MyString
str = ReadMemory(Me.hWnd, StrPtr(MyString), LenB(MyString), "BYE!!")
MsgBox "Now, MyString=" & MyString & vbCr & "Old Value= " & str
End Sub
Private Function ReadMemory(hWnd As Long, Address As Long, Bytes As Long, Optional strReplaceWith As String) As String
'Runs For Not Unicode Strings (VB-Strings)
On Error Resume Next
Dim pId As Long ' Used to hold the Process Id
Dim pHandle As Long ' Holds the Process Handle
Dim bytValue As Long 'Stores the value of a byte in the memory
Dim i As Long
Dim Text As String
' Get the ProcId of the Window
GetWindowThreadProcessId hWnd, pId
' use the pId to get a handle
pHandle = OpenProcess(PROCESS_ALL_ACCESS, False, pId)
If (pHandle = 0) Then
'MsgBox "Unable to open process!"
Exit Function
End If
If Address = 0 Then Exit Function
For i = 1 To Bytes Step 2
' Read Byte to Byte
ReadProcessMemory pHandle, Address + i - 1, bytValue, 1, 0&
'value now contains the long value of the byte located in [Address + i - 1] pos.
'ReadMemory is a string...
ReadMemory = ReadMemory & Chr$(bytValue)
Next
'to write numeric values you can ..(Must) use WriteValue API
If LenB(strReplaceWith) <> 0 Then
'No Unicode!!
WriteString pHandle, Address, StrPtr(strReplaceWith), LenB(strReplaceWith), 0&
End If
'Close the Handle
CloseHandle pHandle
End Function
otro agrega 3 labels, 3 textboxes y 1 commandbutton en un form
Lo que hace es cambiar el caption del boton retroceso de la calculadora por otro.
Option Explicit
Private Type OSVERSIONINFO
dwOSVersionInfoSize As Long
dwMajorVersion As Long
dwMinorVersion As Long
dwBuildNumber As Long
dwPlatformId As Long
szCSDVersion As String * 128
End Type
Private Type MEMORY_BASIC_INFORMATION ' 28 bytes
BaseAddress As Long
AllocationBase As Long
AllocationProtect As Long
RegionSize As Long
State As Long
Protect As Long
lType As Long
End Type
Private Type SYSTEM_INFO ' 36 Bytes
dwOemID As Long
dwPageSize As Long
lpMinimumApplicationAddress As Long
lpMaximumApplicationAddress As Long
dwActiveProcessorMask As Long
dwNumberOrfProcessors As Long
dwProcessorType As Long
dwAllocationGranularity As Long
wProcessorLevel As Integer
wProcessorRevision As Integer
End Type
Private Declare Function GetVersionEx Lib "kernel32" Alias "GetVersionExA" (LpVersionInformation As OSVERSIONINFO) As Long
Private Declare Function VirtualQueryEx& Lib "kernel32" (ByVal hProcess As Long, lpAddress As Any, lpBuffer As MEMORY_BASIC_INFORMATION, ByVal dwLength As Long)
Private Declare Sub GetSystemInfo Lib "kernel32" (lpSystemInfo As SYSTEM_INFO)
Private Declare Function OpenProcess Lib "kernel32" (ByVal dwDesiredAccess As Long, ByVal blnheritHandle As Long, ByVal dwAppProcessId As Long) As Long
Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
Private Declare Function ReadProcessMemory Lib "kernel32" (ByVal hProcess As Long, lpBaseAddress As Any, lpBuffer As Any, ByVal nSize As Long, lpNumberOfBytesWritten As Long) As Long
Private Declare Function WriteProcessMemory Lib "kernel32" (ByVal hProcess As Long, lpBaseAddress As Any, lpBuffer As Any, ByVal nSize As Long, lpNumberOfBytesWritten As Long) As Long
Private Declare Function GetWindowThreadProcessId Lib "user32" (ByVal hWnd As Long, lpdwProcessId As Long) As Long
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As Long, ByVal lpWindowName As Long) As Long
Private Declare Function GetParent Lib "user32" (ByVal hWnd As Long) As Long
Private Declare Function GetWindow Lib "user32" (ByVal hWnd As Long, ByVal wCmd As Long) As Long
Const GW_HWNDNEXT = 2
Private Declare Function InvalidateRect Lib "user32" (ByVal hWnd As Long, ByVal lpRect As Long, ByVal bErase As Long) As Long
Const PROCESS_VM_READ = (&H10)
Const PROCESS_VM_WRITE = (&H20)
Const PROCESS_VM_OPERATION = (&H8)
Const PROCESS_QUERY_INFORMATION = (&H400)
Const PROCESS_READ_WRITE_QUERY = PROCESS_VM_READ + PROCESS_VM_WRITE + PROCESS_VM_OPERATION + PROCESS_QUERY_INFORMATION
Const MEM_PRIVATE& = &H20000
Const MEM_COMMIT& = &H1000
Private Sub Command1_Click()
Dim pid As Long, hProcess As Long, hWin As Long
Dim lpMem As Long, ret As Long, lLenMBI As Long
Dim lWritten As Long, CalcAddress As Long, lPos As Long
Dim sBuffer As String
Dim sSearchString As String, sReplaceString As String
Dim si As SYSTEM_INFO
Dim mbi As MEMORY_BASIC_INFORMATION
sSearchString = Text2
sReplaceString = Text3 & Chr(0)
If IsWindowsNT Then 'NT store strings in RAM in UNICODE
sSearchString = StrConv(sSearchString, vbUnicode)
sReplaceString = StrConv(sReplaceString, vbUnicode)
End If
pid = Shell(Text1) 'launch application (calc.exe in this sample)
hWin = InstanceToWnd(pid) 'get handle of launched window - only to repaint it after changes
'Open process with required access
hProcess = OpenProcess(PROCESS_READ_WRITE_QUERY, False, pid)
lLenMBI = Len(mbi)
'Determine applications memory addresses range
Call GetSystemInfo(si)
lpMem = si.lpMinimumApplicationAddress
'Scan memory
Do While lpMem < si.lpMaximumApplicationAddress
mbi.RegionSize = 0
ret = VirtualQueryEx(hProcess, ByVal lpMem, mbi, lLenMBI)
If ret = lLenMBI Then
If ((mbi.lType = MEM_PRIVATE) And (mbi.State = MEM_COMMIT)) Then ' this block is In use by this process
If mbi.RegionSize > 0 Then
sBuffer = String(mbi.RegionSize, 0)
'Read region into string
ReadProcessMemory hProcess, ByVal mbi.BaseAddress, ByVal sBuffer, mbi.RegionSize, lWritten
'Check if region contain search string
lPos = InStr(1, sBuffer, sSearchString, vbTextCompare)
If lPos Then
CalcAddress = mbi.BaseAddress + lPos
Me.Show
ret = MsgBox("Search string was found at address " & CalcAddress & "." & vbCrLf & "Do you want to replace it?", vbInformation + vbYesNo, "VB-O-Matic")
If ret = vbYes Then
'Replace string in virtual memory
Call WriteProcessMemory(hProcess, ByVal CalcAddress - 1, ByVal sReplaceString, Len(sReplaceString), lWritten)
'Redraw window
InvalidateRect hWin, 0, 1
End If
Exit Do
End If
End If
End If
'Increase base address for next searching cicle. Last address may overhead max Long value (Windows use 2GB memory, which is near max long value), so add Error checking
On Error GoTo Finished
lpMem = mbi.BaseAddress + mbi.RegionSize
On Error GoTo 0
Else
Exit Do
End If
Loop
Finished:
CloseHandle hProcess
End Sub
Private Sub Form_Load()
Caption = "VB-O-Matic"
Label1 = "Start application:"
Label2 = "String to find:"
Label3 = "Replace with:"
Text1 = "Calc.exe"
Text2 = "Retroceso"
Text3 = "VB-O-Matic"
Command1.Caption = "&Launch It!"
End Sub
Private Function InstanceToWnd(ByVal target_pid As Long) As Long
Dim test_hwnd As Long
Dim test_pid As Long
Dim test_thread_id As Long
test_hwnd = FindWindow(ByVal 0&, ByVal 0&)
Do While test_hwnd <> 0
If GetParent(test_hwnd) = 0 Then
test_thread_id = GetWindowThreadProcessId(test_hwnd, test_pid)
If test_pid = target_pid Then
InstanceToWnd = test_hwnd
Exit Do
End If
End If
test_hwnd = GetWindow(test_hwnd, GW_HWNDNEXT)
Loop
End Function
Private Function IsWindowsNT() As Boolean
Dim verinfo As OSVERSIONINFO
verinfo.dwOSVersionInfoSize = Len(verinfo)
If (GetVersionEx(verinfo)) = 0 Then Exit Function
If verinfo.dwPlatformId = 2 Then IsWindowsNT = True
End Function
y bueno ya que esta el hilo abierto estaria lindo quien tenga otros ejemplo lo ponga a continuacion para hacer una pequeña recopilacion sobre el uso de estas dos apis.