есть некоторые API, которые вы можете вызвать, могут захватить объект окна и сделать последующие вызовы, чтобы захватить дескриптор текстовых полей в окне.когда у вас есть дескриптор, вы можете вызвать другой API для установки текста на нем.вот некоторые из API, о которых я говорю:
<DllImport("user32.dll", CharSet:=CharSet.Auto, ExactSpelling:=True)>
Private Shared Function GetForegroundWindow() As IntPtr
End Function
<DllImport("user32.dll", CharSet:=CharSet.Auto, ExactSpelling:=True)>
Private Shared Function ShowWindow(ByVal hWnd As IntPtr, ByVal nCmdShow As Integer) As IntPtr
End Function
<DllImport("user32.dll", CharSet:=CharSet.Auto, ExactSpelling:=True)>
Private Shared Function DestroyWindow(ByVal hWnd As IntPtr) As Boolean
End Function
Private Declare Function FindWindow Lib "user32.dll" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As IntPtr
<DllImport("user32", CharSet:=CharSet.Auto, SetLastError:=True, ExactSpelling:=True)>
Private Shared Function GetWindow(ByVal hwnd As IntPtr, ByVal uCmd As Integer) As IntPtr
End Function
Private Declare Function SetFocus Lib "user32.dll" (ByVal hwnd As IntPtr) As IntPtr
'Private Declare Function SetWindowText Lib "user32.dll" Alias "SetWindowTextA" (ByVal hWnd As IntPtr, ByVal lpString As String) As Boolean
<DllImport("user32.dll", SetLastError:=True, CharSet:=CharSet.Auto)> _
Private Shared Function SendMessage(ByVal hWnd As HandleRef, ByVal Msg As UInteger, ByVal wParam As IntPtr, ByVal lParam As String) As IntPtr
End Function
Public Sub SetTitle(ByVal Title As String)
Dim h As New HandleRef(Me, Handle)
SendMessage(h, WM_SETTEXT, 0, Title)
End Sub
Public Function GetTitle() As String
Dim str As String = String.Empty
Dim h As New HandleRef(Me, Handle)
SendMessage(h, WM_GETTEXT, 300, str)
Return str
End Function