1. 如何消除textbox中按下回车时的beep声？

　　2.Textbox获得焦点时自动选中。

　　3.屏蔽textbox控件自身的右键菜单，并显示自己的菜单。

　　方法一：

　　方法二：回调函数

　　窗体中：

　　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

　　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

　　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

　　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 = "SoftwareMicrosoftWindowsCurrentVersionRun"
　 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

　　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。

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
<assemblyIdentity
version="1.0.0.0"
processorArchitecture="X86"
name="CompanyName.ProductName.YourApp"
type="win32"
/>
<description>Your application description here.</description>
<dependency>
<dependentAssembly>
<assemblyIdentity
type="win32"
name="Microsoft.Windows.Common-Controls"
version="6.0.0.0"
processorArchitecture="X86"
publicKeyToken="6595b64144ccf1df"
language="*"
/>
</dependentAssembly>
</dependency>
</assembly>

　　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

(编辑:aniston)