pro_1.frm

是API教程4

VERSION 5.00
Begin VB.Form Form1 
   BackColor       =   &H00C0C0C0&
   BorderStyle     =   1  'Fixed Single
   Caption         =   "lesson4_1"
   ClientHeight    =   4305
   ClientLeft      =   45
   ClientTop       =   330
   ClientWidth     =   5880
   LinkTopic       =   "Form1"
   MaxButton       =   0   'False
   MinButton       =   0   'False
   ScaleHeight     =   4305
   ScaleWidth      =   5880
   StartUpPosition =   3  'Windows Default
   Begin VB.PictureBox Picture1 
      Appearance      =   0  'Flat
      BackColor       =   &H00FF8080&
      ForeColor       =   &H80000008&
      Height          =   3435
      Left            =   420
      ScaleHeight     =   3405
      ScaleWidth      =   5025
      TabIndex        =   0
      Top             =   360
      Width           =   5055
      Begin VB.CommandButton Command1 
         Caption         =   "剪切开始"
         Height          =   615
         Left            =   1800
         TabIndex        =   1
         Top             =   1380
         Width           =   1395
      End
   End
   Begin VB.Label Label1 
      Alignment       =   2  'Center
      Caption         =   "现在指针不能移出蓝色框外"
      Height          =   315
      Left            =   360
      TabIndex        =   2
      Top             =   120
      Visible         =   0   'False
      Width           =   4995
   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 Type RECT
    Left As Long
    Top As Long
    Right As Long
    Bottom As Long
End Type

Private Declare Function ClipCursor& Lib "user32" (lpRect As RECT)
Private Declare Function GetClipCursor& Lib "user32" (lprc As RECT)
Private Declare Function GetWindowRect& Lib "user32" (ByVal hwnd As Long, lpRect As RECT)


Private MyRect As RECT
Private isClip As Boolean

Private Sub Command1_Click()
    Dim dl&
    Dim WindowRect As RECT
    
    If isClip Then
        dl& = ClipCursor(MyRect)       '恢复原来的剪切区域
        Command1.Caption = "剪切指针"
    Else
        dl& = GetClipCursor(MyRect)    '保存当前的指针剪切区域
        dl& = GetWindowRect(Picture1.hwnd, WindowRect)     '获取picture控件在屏目中的位置(RECT)
        dl& = ClipCursor(WindowRect)   '指定新的剪切
        Command1.Caption = "结束"
    End If
    isClip = Not isClip            '记载是否是剪切了
    Label1.Visible = Not Label1.Visible
End Sub

Private Sub Form_Load()
    isClip = False                  '程序启动时尚未剪切
End Sub