获得文本框中光标所在行的内容

在form中放一个textBox两个label
Const EM_GETSEL=&HB0
Const EM_LINEFROMCHAR=&HC9
Const EM_LINEINDEX=&HBB

Private Declare Function SendMessage Lib "user32" Alias "SendMessageA"_(ByVal hwnd As Long,ByVal wMsg As Long,ByVal wParam As Long,_lParam As Any) As Long

Public SubGetCaretPos(ByVal hwnd5 As Long,LineNo As Long,ColNo As Long)

Dim i As Long,j As Long
Dim lParam As Long,wParam As Long
Dim k As Long
i=SendMessage(hwnd5,EM_GETSEL,wParam,lParam)
j=i/2^16'取得目前Caret所在前面有多少个byte
LineNo=SendMessage(hwnd5,EM_LINEFROMCHAR,j,0)'取得前面有多少行
LineNo=LineNo+1
k=SendMessage(hwnd5,EM_LINEINDEX,-1,0)
'取得目前caret所在行前面有多少个byte
ColNo=j-k+1
End Sub

Private Sub Form_Load()
Dim LineNo As Long,ColNo As Long
Call GetCaretPos(Text1.hwnd,LineNo,ColNo)
Label1.Caption=LineNo
Label2.Caption=ColNo
End Sub

Private Sub Text1_KeyUp(KeyCode As Integer,Shift As Integer)
Dim LineNo As Long,ColNo As Long
Call GetCaretPos(Text1.hwnd,LineNo,ColNo)
Label1.Caption=LineNo
Label2.Caption=ColNo
End Sub

Private Sub Text1_MouseDown(Button As Integer,Shift As Integer,X As Single,Y As Single)
Dim LineNo As Long,ColNo As Long
Call GetCaretPos(Text1.hwnd,LineNo,ColNo)
Label1.Caption=LineNo
Label2.Caption=ColNo
End Sub