program1.frm

是API教程5

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   1710
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   2100
   LinkTopic       =   "Form1"
   ScaleHeight     =   1710
   ScaleWidth      =   2100
   StartUpPosition =   3  'Windows Default
   Begin VB.TextBox Text1 
      Height          =   1755
      Left            =   0
      TabIndex        =   0
      Text            =   "Text1"
      Top             =   0
      Width           =   2115
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit

Private Declare Function GetDC& Lib "user32" (ByVal hwnd As Long)
Private Declare Function Ellipse& Lib "gdi32" (ByVal hdc As Long, ByVal X1 As Long, ByVal Y1 As Long, ByVal X2 As Long, ByVal Y2 As Long)
Private Declare Function ReleaseDC& Lib "user32" (ByVal hwnd As Long, ByVal hdc As Long)



Private Sub Form_Load()
   Text1.Text = ""
End Sub

Private Sub Text1_Click()
   Dim TextDC As Long
   
   TextDC = GetDC(Text1.hwnd)
   Ellipse TextDC, 0, 0, 100, 100
   ReleaseDC Text1.hwnd, TextDC
End Sub