vb编程68例

yulijin608 · 发表于 2005-1-6 11:36:00

1. 如何消除textbox中按下回车时的beep声？
Private Sub Text1_KeyPress(KeyAscii As Integer)
   If KeyAscii = 13 Then
   KeyAscii = 0
   End If
End Sub2.Textbox获得焦点时自动选中。
Private Sub Text1_GotFocus()
   Text1.SelStart = 0
   Text1.SelLength = Len(Text1.Text)
End Sub
3.屏蔽textbox控件自身的右键菜单，并显示自己的菜单。
方法一：
Private Sub Text1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y _
As Single)
   If Button = 2 Then
   Text1.Enabled = False
   Text1.Enabled = True
   PopupMenu mymenu
   End If
End Sub
方法二：回调函数
module：
Option Explicit
Public OldWindowProc As Long ' 保存默认的窗口函数的地址
Public Const WM_CONTEXTMENU = &H7B ' 当右击文本框时，产生这条消息
Public Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hWnd _
As Long, ByVal nIndex As Long) As Long
Public Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hWnd _    As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Private Declare Function CallWindowProc Lib "user32" Alias "CallWindowProcA" (ByVal _ lpPrevWndFunc As Long, ByVal hWnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Public Function SubClass_WndMessage(ByVal hWnd As Long, ByVal Msg As Long, ByVal wp _
As Long, ByVal lp As Long) As Long
' 如果消息不是WM_CONTEXTMENU，就调用默认的窗口函数处理
If Msg  WM_CONTEXTMENU Then
   SubClass_WndMessage = CallWindowProc(OldWindowProc, hWnd, Msg, wp, lp)
   Exit Function
End If
SubClass_WndMessage = True
End Function
窗体中：
Private Const GWL_WNDPROC = (-4)
Private Sub Text1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y _
As Single)
If Button = 1 Then Exit Sub
   OldWindowProc = GetWindowLong(Text1.hWnd, GWL_WNDPROC) ' 取得窗口函数的地址
   ' 用SubClass_WndMessage代替窗口函数处理消息
   Call SetWindowLong(Text1.hWnd, GWL_WNDPROC, AddressOf SubClass_WndMessage)
End Sub
Private Sub Text1_MouseUp(Button As Integer, Shift As Integer, X As Single, Y As Single)
   If Button = 1 Then Exit Sub
   ' 恢复窗口的默认函数
   Call SetWindowLong(Text1.hWnd, GWL_WNDPROC, OldWindowProc)
   PopupMenu mymenu
End Sub

yulijin608 · 发表于 2005-1-6 11:36:00

4. 设置TEXTBOX为只读属性
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
Private Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hwnd _ As Long, ByVal nIndex As Long) As Long
Private Const GWL_STYLE = (-16)
Private Const EM_SETREADONLY = &HCF
Private Sub Command1_Click()
   Dim l As Long
   If (GetWindowLong(Text1.hwnd, GWL_STYLE) And &H800) Then
   Text1.Text = "This is a read/write text box."    '文本窗口是只读窗口,设置为可读写窗口
   l = SendMessage(Text1.hwnd, EM_SETREADONLY, False, vbNull)
   Text1.BackColor = RGB(255, 255, 255)    '将背景设置为白色
   Command1.Caption = "Read&Write"
   Else
   Text1.Text = "This is a readonly text box."    '文本窗口是可读写窗口,设置为只读窗口
   l = SendMessage(Text1.hwnd, EM_SETREADONLY, True, vbNull)
   Text1.BackColor = vbInactiveBorder    '将背景设置为灰色
   Command1.Caption = "&ReadOnly"
   End If
End Sub
5. 利用API函数MessageBox代替MSGBOX函数可以使得Timer控件正常工作
Private Declare Function MessageBox Lib "user32" Alias "MessageBoxA" (ByVal hwnd As _ Long, ByVal lpText As String, ByVal lpCaption As String, ByVal wType As Long) As Long
Private Sub Command1_Click()
   MsgBox "时钟变的无效了"
End Sub
Private Sub Command2_Click()
   MessageBox Me.hwnd, "时钟正常运行", "hehe", 0
End Sub
Private Sub Timer1_Timer()
   Static i As Integer
   i = i + 1
   Text1.Text = i
End Sub
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
Public Sub SetOnTop(ByVal IsOnTop As Integer)
Dim rtn As Long
   If IsOnTop = 1 Then
   rtn = SetWindowPos(Form1.hwnd, -1, 0, 0, 0, 0, 3)
   Else
   rtn = SetWindowPos(Form1.hwnd, -2, 0, 0, 0, 0, 3)
   End If
End Sub
Private Sub Command1_Click()
   SetOnTop 1    '将窗口置于最上面
End Sub
Private Sub Command2_Click()
   SetOnTop 0
End Sub
7.只容许运行一个程序实例（利用互斥体）
选择启动对象为sub main()
module:
Public Declare Function CreateMutex Lib "kernel32" Alias "CreateMutexA" _ (lpMutexAttributes As SECURITY_ATTRIBUTES, ByVal bInitialOwner As Long, ByVal lpName _
As String) As Long
Public Type SECURITY_ATTRIBUTES
   nLength As Long
   lpSecurityDescriptor As Long
   bInheritHandle As Long
End Type
Public Const ERROR_ALREADY_EXISTS = 183&
Private Sub Main()
   Dim sa As SECURITY_ATTRIBUTES
   sa.bInheritHandle = 1
   sa.lpSecurityDescriptor = 0
   sa.nLength = Len(sa)
   Debug.Print CreateMutex(sa, 1, App.Title)    '这一行可千万不能删除啊
   Debug.Print Err.LastDllError
   If (Err.LastDllError = ERROR_ALREADY_EXISTS) Then
   MsgBox "More than one instance"
   Else
   Form1.Show
   End If
End Sub
8.窗体标题栏闪烁
Option Explicit
Private Declare Function FlashWindow Lib "user32" (ByVal hwnd As Long, ByVal bInvert _
As Long) As Long
Private Sub tmrFlash_Timer()
   Static mFlash As Boolean
   FlashWindow hwnd, Not mFlash
End Sub
8.    拷屏
方法一：利用模拟键盘
Private Declare Sub keybd_event Lib "user32" (ByVal bVk As Byte, ByVal bScan As Byte, _ ByVal dwFlags As Long, ByVal dwExtraInfo As Long)
Const theScreen = 1
Const theForm = 0
Private Sub Command1_Click()
Call keybd_event(vbKeySnapshot, theForm, 0, 0)    '若theForm改成theScreen则Copy整个Screen
DoEvents
Picture1.Picture = Clipboard.GetData(vbCFBitmap)
End Sub

yulijin608 · 发表于 2005-1-6 11:37:00

9. 为程序注册热键
方法一：修改注册表
Private Declare Function RegisterHotKey Lib "user32" (ByVal hWnd As Long, ByVal id _
As Long, ByVal fsModifiers As Long, ByVal vk As Long) As Long
Private Declare Function UnregisterHotKey Lib "user32" (ByVal hWnd As Long, ByVal id _
As Long) As Long
Private Declare Function PeekMessage Lib "user32" Alias "PeekMessageA" (lpMsg As Msg, _ ByVal hWnd As Long, ByVal wMsgFilterMin As Long, ByVal wMsgFilterMax As Long, ByVal _ wRemoveMsg As Long) As Long
Private Declare Function WaitMessage Lib "user32" () As Long
Private Type POINTAPI
   x As Long
   y As Long
End Type
Private Type Msg
   hWnd As Long
   Message As Long
   wParam As Long
   lParam As Long
   time As Long
   pt As POINTAPI
End Type
'    声明常数
Private Const MOD_ALT = &H1
Private Const MOD_CONTROL = &H2
Private Const MOD_SHIFT = &H4
Private Const PM_REMOVE = &H1
Private Const WM_HOTKEY = &H312
Private HotKey_Fg As Boolean
Private Sub Form_Load()
   Dim Message As Msg
   '注册 Ctrl+Y 为热键
   RegisterHotKey Me.hWnd, &HBFFF&, MOD_CONTROL, vbKeyY
   'RegisterHotKey Me.hWnd, &HBFF2&, MOD_CONTROL, vbKeyU
   Me.Show
   Form1.Hide
   '等待处理消息
   HotKey_Fg = False
   Do While Not HotKey_Fg
   '等待消息
   WaitMessage
   '检查是否热键被按下
   If PeekMessage(Message, Me.hWnd, WM_HOTKEY, WM_HOTKEY, PM_REMOVE) Then
   Form1.Show 1
   End If
   '转让控制权,允许操作系统处理其他事件
   DoEvents
   Loop
End Sub
Private Sub Form_Unload(Cancel As Integer)
   HotKey_Fg = True
   '撤销热键的注册
   Call UnregisterHotKey(Me.hWnd, &HBFFF&)
End Sub
方法二：SendMessage
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
Private Const WM_SETHOTKEY = &H32
Private Const HOTKEYF_SHIFT = &H1
Private Const HOTKEYF_ALT = &H4
Private Sub Form_Load()
   Dim l As Long
   Dim wHotkey As Long
   wHotkey = (HOTKEYF_ALT) * (2 ^ 8) + 65    '定义ALT+A为热键
   l = SendMessage(Me.hwnd, WM_SETHOTKEY, wHotkey, 0)
End Sub
10.在状态栏显示无边框窗体图标。
Private Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hWnd _ As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Private Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hWnd _ As Long, ByVal nIndex As Long) As Long
Const GWL_STYLE = (-16&)
Const WS_SYSMENU = &H80000
Private Sub Form_Load()
'Make Form's Icon visible in the taskbar
SetWindowLong Me.hWnd, GWL_STYLE, GetWindowLong(Me.hWnd, GWL_STYLE) Or WS_SYSMENU
End Sub
11. 记录窗体的大小及位置和程序中的一些设置
Private Sub Form_Load()
   Me.Width = GetSetting(App.Title, Me.Name, "Width", 7200)
   Me.Height = GetSetting(App.Title, Me.Name, "Height", 6300)
   Me.Top = GetSetting(App.Title, Me.Name, "Top", 100)
   Me.Left = GetSetting(App.Title, Me.Name, "Left", 100)
   Check1.Value = GetSetting(App.Title, Me.Name, "check1", 0)
End Sub
Private Sub Form_Unload(Cancel As Integer)
   Call SaveSetting(App.Title, Me.Name, "Width", Me.Width)
   Call SaveSetting(App.Title, Me.Name, "Height", Me.Height)
   Call SaveSetting(App.Title, Me.Name, "Top", Me.Top)
   Call SaveSetting(App.Title, Me.Name, "Left", Me.Left)
   Call SaveSetting(App.Title, Me.Name, "check1", Check1.Value)
End Sub
12. 解决mschart控件数据更改时的闪动现象
1、在有MSChart控件的窗体中另外加入一个PictureBox控件，如MSChart1和Picture1。
2、使Picture1和MSChart1大小一致，位置相同（通过左对齐和顶端对齐）。
3、使Picture1在MSChart1前端，设置Picture1的Visible为False，即不可见。只有刷新数据时Picture1才显示。
'刷新数据过程
Private Sub Refresh()
Dim V_newchar() 'n维数组
……
Picture1.Visible = True
MSChart1.ChartData = V_newchar '给MSChart1重新赋值,即刷新数据
MSChart1.EditCopy '将当前图表的图片复制到剪贴板中
Picture1.Picture = Clipboard.GetData() '给Picture1赋值剪贴板中的图片
End Sub
这样每一次刷新数据时Picture1显示的图片都不会产生闪烁现象

yulijin608 · 发表于 2005-1-6 11:38:00

13.    无边框窗体的右键菜单
设计无边框窗体时，如果使用菜单编辑器，就会自动改变成有边框的窗体，此时，可以在另外一个窗体中（一般情况下你的程序应该不止一个窗体的吧，如果真的只有一个，可以利用其他人写的类，添加右键）编辑菜单（VISIBLE属性设为FALSE），然后在本窗体中调用。调用形式如下：
Private Sub Form_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
If Button = 2 Then
PopupMenu Form2.mymenu
End If
End Sub
14.创建圆角无边框窗体
Private Declare Function CreateRoundRectRgn Lib "gdi32" (ByVal X1 As Integer, ByVal Y1 _ As Integer, ByVal X2 As Integer, ByVal Y2 As Integer, ByVal x3 As Integer, ByVal y3 As _ Integer) As Long
Private Declare Function DeleteObject Lib "gdi32" (ByVal hObject As Long) As Long
Private Declare Function SetWindowRgn Lib "user32" (ByVal hwnd As Long, ByVal hrgn As _ Long, ByVal bRedraw As Boolean) As Long
Private Sub Form_Load()
   hround = CreateRoundRectRgn(0, 0, ScaleX(Form1.ScaleWidth, vbTwips, vbPixels), _ ScaleY(Form1.ScaleHeight, vbTwips, vbPixels), 20, 20)
SetWindowRgn Me.hwnd, hround, True
DeleteObject hround
End Sub
15.拖动没有标题栏的窗体
方法一：
Private Declare Function ReleaseCapture Lib "user32" () As Long
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
Private Const HTCAPTION = 2
Private Const WM_NCLBUTTONDOWN = &HA1
Private Sub Form_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
   Dim ncl As Long
   Dim rel As Long
   If Button = 1 Then
   i = ReleaseCapture()
   ncl = SendMessage(hwnd, WM_NCLBUTTONDOWN, HTCAPTION, 0)
   End If
End Sub
方法二：回调函数
module:
Public Const GWL_WNDPROC = (-4)
Public Const WM_NCHITTEST = &H84
Public Const HTCLIENT = 1
Public Const HTCAPTION = 2
Declare Function CallWindowProc Lib "user32" Alias "CallWindowProcA" (ByVal _ lpPrevWndFunc As Long, ByVal hWnd As Long, ByVal Msg As Long, ByVal wParam As Long, _ ByVal lParam As Long) As Long
Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hWnd As _
Long,    ByVal nIndex As Long) As Long
Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hWnd As _
Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Public prevWndProc As Long
Function WndProc(ByVal hWnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal _Param As Long) As Long
   WndProc = CallWindowProc(prevWndProc, hWnd, Msg, wParam, lParam)
   If Msg = WM_NCHITTEST And WndProc = HTCLIENT Then
   WndProc = HTCAPTION
   End If
End Function
窗体中:
Private Sub Form_Load()
   prevWndProc = GetWindowLong(Me.hWnd, GWL_WNDPROC)
   SetWindowLong Me.hWnd, GWL_WNDPROC, AddressOf WndProc
End Sub
Private Sub Form_Unload(Cancel As Integer)
   SetWindowLong Me.hWnd, GWL_WNDPROC, prevWndProc
End Sub
16. 半透明窗体
Private Declare Function SetLayeredWindowAttributes Lib "user32" (ByVal hwnd As Long, _ ByVal crKey As Long, ByVal bAlpha As Byte, ByVal dwFlags As Long) As Long
Private Const WS_EX_LAYERED = &H80000
Private Const LWA_ALPHA = &H2
Private Const GWL_EXSTYLE = (-20)
Private Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal _
hwnd As Long, ByVal nIndex As Long) As Long
Private Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal _
hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Private Sub Form_Load()
   Dim rtn As Long
   rtn = GetWindowLong(Me.hwnd, GWL_EXSTYLE)    '取的窗口原先的样式
   rtn = rtn Or WS_EX_LAYERED    ' 使窗体添加上新的样式WS_EX_LAYERED
   SetWindowLong Me.hwnd, GWL_EXSTYLE, rtn    ' 把新的样式赋给窗体
   SetLayeredWindowAttributes Me.hwnd, 0, 200, LWA_ALPHA
End Sub

yulijin608 · 发表于 2005-1-6 11:38:00

17.开机启动（函数及常数声明略）
Private Sub Form_Load()
   Dim hKey As Long, SubKey As String, Exe As String
   SubKey = "Software\Microsoft\Windows\CurrentVersion\Run"
   Exe = "可执行文件的路径"
   RegCreateKey HKEY_CURRENT_USER, SubKey, hKey
   RegSetvalueEx hKey, "autorun", 0, REG_SZ, ByVal Exe,LenB(StrConv(Exe, vbFromUnicode)) + 1
   RegCloseKey hKey
End Sub
18.关闭显示器
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
Const WM_SYSCOMMAND = &H112&
Const SC_MONITORPOWER = &HF170&
Private Sub Command1_Click()
   SendMessage Me.hwnd, WM_SYSCOMMAND, SC_MONITORPOWER, ByVal 2& '关闭显示器
End Sub
Private Sub Command2_Click()
   SendMessage Me.hwnd, WM_SYSCOMMAND, SC_MONITORPOWER, ByVal -1& '打开显示器
End Sub
19. 在程序结束时自动关闭由SHELL打开的程序。
Private Const PROCESS_QUERY_INFORMATION = &H400    '关闭由SHELL函数打开的文件
Private Const PROCESS_TERMINATE = &H1
Private Declare Function OpenProcess Lib "kernel32" (ByVal dwDesiredAccess As Long, _ ByVal bInheritHandle As Long, ByVal dwProcessId As Long) As Long
Private Declare Function TerminateProcess Lib "kernel32" (ByVal hProcess As Long, _
ByVal uExitCode As Long) As Long
Dim ProcessId As Long
Private Sub Command1_Click()
   ProcessId = Shell("notepad.exe.", vbNormalFocus)
End Sub
Private Sub Form_Unload(Cancel As Integer)
   Dim hProcess    As Long
   hProcess = OpenProcess(PROCESS_TERMINATE Or PROCESS_QUERY_INFORMATION, False, _ ProcessId)
   Call TerminateProcess(hProcess, 3838)
End Sub
20. 关闭、重启计算机
Public Declare Function ExitWindowsEx Lib "user32" Alias "ExitWindowsEx" (ByVal _
uFlags As Long, ByVal dwReserved As Long) As Long
ExitWindowsEx 1，0 关机
ExitWindowsEx 0，1 重新启动

yulijin608 · 发表于 2005-1-6 11:39:00

21.显示关机提示框
Private Declare Function SHRestartSystemMB Lib "shell32" Alias "#59" (ByVal hOwner _
As Long, ByVal sExtraPrompt As String,
ByVal uFlags As Long) As Long
Const EWX_LOGOFF = 0
Const EWX_SHUTDOWN = 1
Const EWX_REBOOT = 2
Const EWX_FORCE = 4
Const EWX_POWEROFF = 8
Private Sub Command1_Click()
SHRestartSystemMB Me.hWnd, PROMPT, EWX_LOGOFF
End Sub
22.右键托盘图标后必须电击他才可以消失，怎么办？
Case WM_RBUTTONUP '鼠标在图标上右击时弹出菜单
   SetForegroundWindow Me.hwnd
   Me.PopupMenu mnuTray
加一句 SetForegroundWindow Me.hwnd
23. 将progressbar嵌入statusbar中
Private Declare Function SetParent Lib "user32" (ByVal hWndChild As Long, ByVal _ hWndNewParent As Long) As Long
Private Sub Command1_Click()
   With ProgressBar1
   .Max = 1000
   Dim i As Integer
   For i = 1 To 1000
   .Value = i
   Next i
   End With
End Sub
Private Sub Form_Load()
   ProgressBar1.Appearance = ccFlat
   SetParent ProgressBar1.hWnd, StatusBar1.hWnd
   ProgressBar1.Left = StatusBar1.Panels(1).Left
   ProgressBar1.Top = 100
   ProgressBar1.Width = StatusBar1.Panels(1).Width - 50
   ProgressBar1.Height = StatusBar1.Height - 150
End Sub    '相对位置你可以自己再调一下
24.使你的程序界面具有XP风格
产生一个和你的可执行程序同名的后缀为exe.manifest的文件，并和可执行文件放在同一路径中。
代码中加入:
Private    Declare Sub InitCommonControls Lib "comctl32.dll" ()
Private Sub Form_Initialize()
   InitCommonControls
End Sub
注意：
1 工具栏控件一定要用Microsoft Windows Common Controls 5.0，而不要用Microsoft Windows Common Controls 6.0。因为此
InitCommonControls API函数是位于comctl32.dll（Microsoft Windows Common Controls 5.0控件的动态链接库中）。
2 放在FRAME控件中的单远按钮有些“麻烦”！为了解决此问题，可以将单选按钮放在PICTURE控件中（以PICTURE控件作为容器），再将
PICTURE控件放在FRAME控件中，就可以了。
3 必须编译之后才能看到效果
exe.manifest文件中的内容，可用notepad编辑。

Your application description here.

yulijin608 · 发表于 2005-1-6 11:40:00

25.如何打印PictureBox中的所有控件
添加另外一个PictureBox，然后：
Private Const WM_PAINT = &HF
Private Const WM_PRINT = &H317
Private Const PRF_CLIENT = &H4&
Private Const PRF_CHILDREN = &H10&
Private Const PRF_OWNED = &H20&
Private Const PHYSICALOFFSETX As Long = 112
Private Const PHYSICALOFFSETY As Long = 113
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd _
As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Private Declare Function GetDeviceCaps Lib "gdi32" (ByVal hdc As Long, ByVal nindex _
As Long) As Long
private Sub Form_Load()
   Picture1.AutoRedraw = True
   Picture2.AutoRedraw = True
   Picture2.BorderStyle = 0
   Picture2.Visible = False
End Sub
Private Sub Command2_Click()
   Dim retval As Long, xmargin As Single, ymargin As Single
   Dim x As Single, y As Single
   x = 1: y = 1
   With Printer
   .ScaleMode = vbInches
   xmargin = GetDeviceCaps(.hdc, PHYSICALOFFSETX)
   xmargin = (xmargin * .TwipsPerPixelX) / 1440
   ymargin = GetDeviceCaps(.hdc, PHYSICALOFFSETY)
   ymargin = (ymargin * .TwipsPerPixelY) / 1440
   Picture2.Width = Picture1.Width
   Picture2.Height = Picture1.Height
   DoEvents
   Picture1.SetFocus
   retval = SendMessage(Picture1.hwnd, WM_PAINT, Picture2.hdc, 0)
   retval = SendMessage(Picture1.hwnd, WM_PRINT, Picture2.hdc, _
   PRF_CHILDREN + PRF_CLIENT + PRF_OWNED)
   DoEvents
   Printer.Print ""
   .PaintPicture Picture2.Image, x - xmargin, y - ymargin
   .EndDoc
   End With
End Sub
26.冒泡排序如下：
Sub BubbleSort(List() As Double)
Dim First As Double, Last As Double
Dim i As Integer, j As Integer
Dim Temp As Double
First = LBound(List)
Last = UBound(List)
For i = First To Last - 1
For j = i + 1 To Last
If List(i) > List(j) Then
Temp = List(j)
List(j) = List(i)
List(i) = Temp
End If
Next j
Next i
End Sub
27.清空回收站
Private Declare Function SHEmptyRecycleBin Lib "shell32.dll" Alias _
"SHEmptyRecycleBinA" (ByVal hwnd As Long, ByVal pszRootPath As String, _
ByVal dwFlags As Long) As Long
Private Declare Function SHUpdateRecycleBinIcon Lib "shell32.dll" () As Long
Private Const SHERB_NOCONFIRMATION = &H1
Private Const SHERB_NOPROGRESSUI = &H2
Private Const SHERB_NOSOUND = &H4
Private Sub Command1_Click()
Dim retval As Long    ' return value
   retval = SHEmptyRecycleBin(RecycleBin.hwnd, "", SHERB_NOPROGRESSUI) ' 清空回收站, 确认
   ' 若有错误出现，则返回回收站图示
   If retval  0 Then    ' error
   retval = SHUpdateRecycleBinIcon()
   End If
End Sub
Private Sub Command2_Click()
   Dim retval As Long    ' return value
   ' 清空回收站, 不确认
   retval = SHEmptyRecycleBin(RecycleBin.hwnd, "", SHERB_NOCONFIRMATION)
   ' 若有错误出现，则返回回收站图示
   If retval  0 Then    ' error
   retval = SHUpdateRecycleBinIcon()
   End If
   Command1_Click
End Sub
28.获得系统文件夹的路径
Private Declare Function GetSystemDirectory Lib "kernel32" Alias _
"GetSystemDirectoryA" (ByVal lpBuffer As String, ByVal nSize As Long) As Long
Private Sub Command1_Click()
   Dim syspath As String
   Dim len5 As Long
   syspath = String(255, 0)
   len5 = GetSystemDirectory(syspath, 256)
   syspath = Left(syspath, InStr(1, syspath, Chr(0)) - 1)
   Debug.Print "System Path : "; syspath
End Sub

yulijin608 · 发表于 2005-1-6 11:40:00

29.动态增加控件并响应事件
Option Explicit
   '通过使用WithEvents关键字声明一个对象变量为新的命令按钮
   Private WithEvents NewButton As CommandButton
   '增加控件
   Private Sub Command1_Click()
   If NewButton Is Nothing Then
   '增加新的按钮cmdNew
   Set NewButton = Controls.Add("VB.CommandButton", "cmdNew", Me)
   '确定新增按钮cmdNew的位置
   NewButton.Move Command1.Left + Command1.Width + 240, Command1.Top
   NewButton.Caption = "新增的按钮"
   NewButton.Visible = True
   End If
   End Sub
   '删除控件(注：只能删除动态增加的控件)
   Private Sub Command2_Click()
   If NewButton Is Nothing Then
   Else
   Controls.Remove NewButton
   Set NewButton = Nothing
   End If
   End Sub
   '新增控件的单击事件
   Private Sub NewButton_Click()
   MsgBox "您选中的是动态增加的按钮！"
   End Sub

30.得到磁盘序列号
Function GetSerialNumber(strDrive As String) As Long
   Dim SerialNum As Long
   Dim Res As Long
   Dim Temp1 As String
   Dim Temp2 As String
   Temp1 = String$(255, Chr$(0))
   Temp2 = String$(255, Chr$(0))
   Res = GetVolumeInformation(strDrive, Temp1, Len(Temp1), SerialNum, 0, 0, Temp2, _
Len(Temp2))
   GetSerialNumber = SerialNum
End Function
调用形式    Label1.Caption = GetSerialNumber("c:\")
31.打开屏幕保护
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
'我们将要调用的那个消息，在MSDN中搜索WM_SYSCOMMAND就可以找到具体说明
Const WM_SYSCOMMAND = &H112
'这个参数指明了我们让系统启动屏幕保护
Const SC_SCREENSAVE = &HF140&
Private Sub Command1_Click()
SendMessage Me.hwnd, WM_SYSCOMMAND, SC_SCREENSAVE, 0
End Sub
32.获得本机IP地址
方法一：利用Winsock控件
winsockip.localip
方法二：
Private Const MAX_IP = 255
   Private Type IPINFO
   dwAddr As Long
   dwIndex As Long
   dwMask As Long
   dwBCastAddr As Long
   dwReasmSize As Long
   unused1 As Integer
   unused2 As Integer
   End Type
   Private Type MIB_IPADDRTABLE
   dEntrys As Long
   mIPInfo(MAX_IP) As IPINFO
   End Type
   Private Type IP_Array
   mBuffer As MIB_IPADDRTABLE
   BufferLen As Long
   End Type
   Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination _
As Any, Source As Any, ByVal Length As
Long)
   Private Declare Function GetIpAddrTable Lib "IPHlpApi" (pIPAdrTable As Byte, _
pdwSize As Long, ByVal Sort As Long) As Long
   Dim strIP As String
   Private Function ConvertAddressToString(longAddr As Long) As String
   Dim myByte(3) As Byte
   Dim Cnt As Long
   CopyMemory myByte(0), longAddr, 4
   For Cnt = 0 To 3
   ConvertAddressToString = ConvertAddressToString + CStr(myByte(Cnt)) + "."
   Next Cnt
   ConvertAddressToString = Left$(ConvertAddressToString, Len(ConvertAddressToString) - 1)
   End Function

   Public Sub Start()
   Dim Ret As Long, Tel As Long
   Dim bBytes() As Byte
   Dim Listing As MIB_IPADDRTABLE
   On Error GoTo END1
   GetIpAddrTable ByVal 0&, Ret, True
   If Ret  0 Then
   sConnectionName = Left$(sNameBuf, iPos - 1)
   ElseIf Not sNameBuf = String$(513, 0) Then
   sConnectionName = sNameBuf
   End If
   InternetConnected = (lR = 1)
End Property
窗体中
Private Sub Form_Load()
   ' Determine whether we have a connection:
   bConnected = InternetConnected(eR, sName)
   ' The connection state info parameter provides details
   ' about how we connect:
   If (eR And INTERNET_CONNECTION_MODEM) = INTERNET_CONNECTION_MODEM Then
   sMsg = sMsg & "Connection uses a modem." & vbCrLf
   End If
   If (eR And INTERNET_CONNECTION_LAN) = INTERNET_CONNECTION_LAN Then
   sMsg = sMsg & "Connection uses LAN." & vbCrLf
   End If
   If (eR And INTERNET_CONNECTION_PROXY) = INTERNET_CONNECTION_PROXY Then
   sMsg = sMsg & "Connection is via Proxy." & vbCrLf
   End If
   If (eR And INTERNET_CONNECTION_OFFLINE) = INTERNET_CONNECTION_OFFLINE Then
   sMsg = sMsg & "Connection is Off-line." & vbCrLf
   End If
   If (eR And INTERNET_CONNECTION_CONFIGURED) = INTERNET_CONNECTION_CONFIGURED Then
   sMsg = sMsg & "Connection is Configured." & vbCrLf
   Else
   sMsg = sMsg & "Connection is Not Configured." & vbCrLf
   End If
   If (eR And INTERNET_RAS_INSTALLED) = INTERNET_RAS_INSTALLED Then
   sMsg = sMsg & "System has RAS installed." & vbCrLf
   End If

   ' Display the connection name and info:
   If bConnected Then
   Text1.Text = "Connected: " & sName & vbCrLf & vbCrLf & sMsg
   Else
   Text1.Text = "Not Connected: " & sName & vbCrLf & vbCrLf & sMsg
   End If
End Sub
38.得到当前windows的版本号
module:
Type OSVERSIONINFO
   dwOSVersionInfoSize As Long
   dwMajorVersion As Long
   dwMinorVersion As Long
   dwBuildNumber As Long
   dwPlatformId As Long
   szCSDVersion As String * 128    '    Maintenance string for PSS usage
End Type
Declare Function GetVersionEx Lib "kernel32" Alias "GetVersionExA" (lpVersionInformation As OSVERSIONINFO) As Long
Declare Function GetSystemMetrics Lib "user32" (ByVal nIndex As Long) As Long
Public Const SM_CLEANBOOT = 67
Public Const SM_DEBUG = 22
Public Const SM_SLOWMACHINE = 73
Public Const VER_PLATFORM_WIN32s = 0
Public Const VER_PLATFORM_WIN32_WINDOWS = 1
Public Const VER_PLATFORM_WIN32_NT = 2
窗体中
Private Sub Form_Load()
Dim myVer As OSVERSIONINFO
Dim nl As String
Dim q As Long
nl = Chr(10) & Chr(13)
myVer.dwOSVersionInfoSize = 148
q& = GetVersionEx(myVer)
lblWininfo = ""
lblMoreWininfo = ""
If myVer.dwPlatformId = VER_PLATFORM_WIN32_WINDOWS Then lblWininfo = lblWininfo & "运行平台 = Windows 95/98" & nl
If myVer.dwPlatformId = VER_PLATFORM_WIN32_NT Then lblWininfo = lblWininfo & "Platform = Windows NT" & nl
lblWininfo = lblWininfo & "Version = " & myVer.dwMajorVersion & "." & myVer.dwMinorVersion & " 创建于 " & (myVer.dwBuildNumber And &HFFFF&) & nl
lblMoreWininfo = "Windows 现在运行在"
If GetSystemMetrics(SM_CLEANBOOT) = 0 Then lblMoreWininfo = lblMoreWininfo & "正常模式" & nl
If GetSystemMetrics(SM_CLEANBOOT) = 1 Then lblMoreWininfo = lblMoreWininfo & "安全模式" & nl
If GetSystemMetrics(SM_CLEANBOOT) = 2 Then lblMoreWininfo = lblMoreWininfo & "局域网安全模式" & nl
If GetSystemMetrics(SM_DEBUG) = True Then lblMoreWininfo = lblMoreWininfo & "Windows Debugging Mode in operation" & nl
If GetSystemMetrics(SM_SLOWMACHINE) = True Then lblMoreWininfo = lblMoreWininfo & "这台PC配置太低无法高效运行 Windows." & nl
End Sub
39.模拟键盘
Private Declare Sub keybd_event Lib "user32" _
(ByVal bVk As Byte, _
ByVal bScan As Byte, _
ByVal dwFlags As Long, _
ByVal dwExtraInfo As Long)
Private Const VK_LWIN = &H5B
Private Const KEYEVENTF_KEYUP = &H2
Private Const VK_APPS = &H5D
Private Const VK_PLAY = &HFA
Private Sub DoAction(Index As Integer)
Dim VK_ACTION As Long
Select Case Index
Case 0: '打开资源管理器
VK_ACTION = &H45
Case 1: '查找文件
VK_ACTION = &H46
Case 2: '最小化所有窗口
VK_ACTION = &H4D
Case 3: '运行程序
VK_ACTION = &H52
Case 4: '弹出Win菜单
VK_ACTION = &H5B
Case 5: '将计算机转如睡眠状态
VK_ACTION = &H5E
Case 6: '执行Windows帮助
VK_ACTION = &H70
End Select
Call keybd_event(VK_LWIN, 0, 0, 0)
Call keybd_event(VK_ACTION, 0, 0, 0)
Call keybd_event(VK_LWIN, 0, KEYEVENTF_KEYUP, 0)
End Sub
40 延迟函数
Public Sub Delay(DelayTime As Single)
   Dim BeginTime As Single
   BeginTime = Timer
   While Timer < BeginTime + DelayTime
   DoEvents
   Wend
End Sub
调用形式    delay 1.5
或者用Sleep函数

vb编程68例

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