Option Explicit

Private Sub Form_Load()

Dim s As String

'creo un archivo de mas de 100 Kb
Open App.Path & "\archivo.txt" For Output As #1
Dim i As Long: For i = 1 To 12500: Print #1, i: Next i
Close #1

'Agrego al archivo la subcadena "XXXXX" al final este
Open App.Path & "\archivo.txt" For Append As #1: Print #1, "XXXXX": Close #1

'Abro el archivo y lo pasa a la variable "s"
Open App.Path & "\archivo.txt" For Input As #1: s = Input(LOF(1), #1): Close #1

MsgBox Len(s), , "La cadena S es mayor a 100 KB"

MsgBox InStr(1, s, "XXXXX"), , "InStr de XXXXX es mayor a 22000"

End

End Sub

Option Explicit
Private Declare Function SetWindowPos Lib "user32" (ByVal Hwnd As Long, ByVal hWndInsertAfter As Long, ByVal x As Long, ByVal y As Long, ByVal cx As Long, ByVal cy As Long, ByVal wFlags As Long) As Long
Private Declare Function GetWindowThreadProcessId Lib "user32" (ByVal Hwnd As Long, lpdwprocessid As Long) As Long
Private Declare Function OpenProcess Lib "kernel32.dll" (ByVal dwDesiredAccess As Long, ByVal bInheritHandle As Long, ByVal dwProcessId As Long) As Long
Private Declare Function GetModuleFileNameExA Lib "PSAPI.DLL" (ByVal hProcess As Long, ByVal hModule As Long, ByVal lpFilename As String, ByVal nSize As Long) As Long
Private Declare Function CloseHandle Lib "kernel32.dll" (ByVal hObject As Long) As Long
Private Declare Function WindowFromPoint Lib "user32" (ByVal xPoint As Long, ByVal yPoint As Long) As Long
Private Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long
Private Type POINTAPI: x As Long: y As Long: End Type

Private Sub Form_Load()
Me.BackColor = vbBlack: Me.ForeColor = vbWhite: Me.FontBold = True
Me.Top = 0: Me.Left = 0: Me.Width = 6450: Me.Height = 1000
Me.BorderStyle = 5: Timer1.Interval = 100
End Sub
'Private Sub Form_Load(): Timer1.Interval = 100: End Sub

Private Sub Timer1_Timer()
Call SetWindowPos(Me.Hwnd, -1, 0, 0, 0, 0, &H2 Or &H1)
Dim Cor As POINTAPI: Dim retorno As Long: retorno = GetCursorPos(Cor)
Dim Handle As Long: Handle = WindowFromPoint(Cor.x, Cor.y)
Dim idProc As Long: Call GetWindowThreadProcessId(Handle, idProc)
Dim Handle_Proceso As Long: Handle_Proceso = OpenProcess(&H400 + &H10, 0, idProc)
Dim Buffer As String: Buffer = Space(255)
Dim ret As Long: ret = GetModuleFileNameExA(Handle_Proceso, 0, Buffer, 255)
Dim Ruta As String: Ruta = Left(Buffer, ret): ret = CloseHandle(Handle_Proceso)
Me.Cls: Me.Print "": Me.Print Ruta: Me.Caption = "ID PROCESO =  " & idProc
End Sub

Option Explicit

Private Sub Form_Load()

Dim s As String
Open App.Path & "\archivo.txt" For Input As #1
s = Input(LOF(1), #1)
Close #1

MsgBox Len(s), , "Len(s)"

Dim s1 As String: s1 = Mid(s, 1, 20000)
Dim s2 As String: s2 = Mid(s, 20001, 20000)
Dim s3 As String: s3 = Mid(s, 40001, 20000)
Dim s4 As String: s4 = Mid(s, 60001, 20000)
Dim s5 As String: s5 = Mid(s, 80001, Len(s))


MsgBox Len(s1), , "s1"
MsgBox Len(s2), , "s2"
MsgBox Len(s3), , "s3"
MsgBox Len(s4), , "s4"
MsgBox Len(s5), , "s5"

' busco los ultimos 10 caracteres de s5 que son los 10 caracters finales del txt
MsgBox Mid(s5, Len(s5) - 10, Len(s5)), , "Ultimos 10 bytes de s5 = Ultimos 10 bytes de archivo.txt"

' "s" sigue siendo la cadena entera
MsgBox Len(s), , "la cadena s se mantiene intacta"


End

End Sub

Option Explicit

Private Sub Form_Load()

Dim s As String
Open App.Path & "\archivo.txt" For Input As #1
s = Input(LOF(1), #1)
Close #1

MsgBox Len(s)

End Sub

Option Explicit

Private Declare Function GetWindowThreadProcessId Lib "user32" (ByVal hwnd As Long, lpdwprocessid As Long) As Long

Private Sub Form_Load()
MsgBox ProcIDFromWnd(65556)
' el Hwnd es constante(65556)
' ID de proceso tambien es constante (452)
End

End Sub

Function ProcIDFromWnd(ByVal hwnd As Long) As Long
Dim idProc As Long
GetWindowThreadProcessId hwnd, idProc
ProcIDFromWnd = idProc
End Function

Option Explicit
Private Declare Function GetWindowThreadProcessId Lib "user32" (ByVal hwnd As Long, lpdwprocessid As Long) As Long
Private Declare Function FindWindow Lib "user32.dll" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Declare Function SendMessage Lib "user32.dll" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Private Declare Function OpenProcess Lib "kernel32.dll" (ByVal dwDesiredAccess As Long, ByVal bInheritHandle As Long, ByVal dwProcessId As Long) As Long
'Obtiene el nombre del proceso a partir de un handle
Private Declare Function GetModuleFileNameExA Lib "PSAPI.DLL" (ByVal hProcess As Long, ByVal hModule As Long, ByVal lpFilename As String, ByVal nSize As Long) As Long
Private Declare Function CloseHandle Lib "kernel32.dll" (ByVal hObject As Long) As Long
Private Const PROCESS_VM_READ As Long = (&H10)
Private Const PROCESS_QUERY_INFORMATION As Long = (&H400)

'Obtiene el Handle de una ventana a partir de una coordenada
Private Declare Function WindowFromPoint Lib "user32" (ByVal xPoint As Long, ByVal yPoint As Long) As Long
'Recupera la coordenada del cursor
Private Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long

Private Type POINTAPI
  x As Long
  y As Long
End Type
Function ProcIDFromWnd(ByVal hwnd As Long) As Long

Dim idProc As Long
GetWindowThreadProcessId hwnd, idProc 'crea ID de un proceso desde un HWnd
ProcIDFromWnd = idProc 'retorno de la ID  de un proceso

End Function

Private Sub Form_Load()

Timer1.Interval = 100

End Sub

Private Sub Timer1_Timer()

Dim retorno As Long
Dim Handle As Long
Dim Cor As POINTAPI

'Obtiene la coordenada del Mouse
retorno = GetCursorPos(Cor)
'Recuperamos el HWND de la ventana asociada a esa coordenada
Handle = WindowFromPoint(Cor.x, Cor.y)

Dim Handle_Proceso As Long: Handle_Proceso = OpenProcess(&H400 + &H10, 0, ProcIDFromWnd(Handle))

If Handle_Proceso <> 0 Then
Dim Buffer As String: Buffer = Space(255) ' Crea un buffer para almacenar el nombre y ruta
Dim ret As Long: ret = GetModuleFileNameExA(Handle_Proceso, 0, Buffer, 255) ' pasa el Buffer al Api y el Handle
Dim Ruta As String: Ruta = Left(Buffer, ret) ' Le elimina los espacios nulos a la cadena devuelta
End If

ret = CloseHandle(Handle_Proceso) 'Cierra el proceso abierto

Me.Cls: Me.Print Ruta 'Muestra la ruta del proceso

End Sub