VB常用代码总结 -- ★RED★STAR★-- 编程爱好者博客

VB常用代码总结

作者：゜|ｍ&⒌哖後

移动无标题栏的窗体(borderstyle=none)
dim mouseX as integer
dim mouseY as integer
dim moveX as integer
dim moveY as integer
dim down as boolean
form_mousedown: 'mousedown事件
down=true
mouseX=x
mouseY=y
form_mouseup: 'mouseup事件
down=false
form_mousemove
if down=true then
   moveX=me.left-mouseX+X
   moveY=me.top-mouseY+Y
   me.move moveX,moveY
end if
***********************************************************************
闪烁控件
比如要闪烁一个label（标签）
添加一个时钟控件间隔请根据实际需要设置 enabled属性设为true
代码为：label1.visible=not label1.visible
**********************************************************************
禁止使用 Alt+F4 关闭窗口
Private Declare Function DeleteMenu Lib "user32" (ByVal hMenu As Long, ByVal nPosition As Long, ByVal wFlags As Long) As Long
Private Declare Function GetMenuItemCount Lib "user32" (ByVal hMenu As Long) As Long
Private Const MF_BYPOSITION = &H400&

Private Sub Form_Load()
Dim hwndMenu As Long
Dim c As Long
hwndMenu = GetSystemMenu(Me.hwnd, 0)

c = GetMenuItemCount(hwndMenu)

DeleteMenu hwndMenu, c - 1, MF_BYPOSITION

c = GetMenuItemCount(hwndMenu)
DeleteMenu hwndMenu, c - 1, MF_BYPOSITION
End Sub
***********************************************************************
启动控制面板大全
'打开控制面板
Call Shell("rundll32.exe shell32.dll,Control_RunDLL", 9)
'辅助选项属性-键盘
Call Shell("rundll32.exe shell32.dll,Control_RunDLL access.cpl,,1", 9)
'辅助选项属性-声音
Call Shell("rundll32.exe shell32.dll,Control_RunDLL access.cpl,,2", 9)
'辅助选项属性-显示
Call Shell("rundll32.exe shell32.dll,Control_RunDLL access.cpl,,3", 9)
'辅助选项属性-鼠标
Call Shell("rundll32.exe shell32.dll,Control_RunDLL access.cpl,,4", 9)
'辅助选项属性-常规
Call Shell("rundll32.exe shell32.dll,Control_RunDLL access.cpl,,5", 9)
'添加/删除程序属性-安装/卸载
Call Shell("rundll32.exe shell32.dll,Control_RunDLL Appwiz.cpl,,1", 9)
'添加/删除程序属性-Windows安装程序
Call Shell("rundll32.exe shell32.dll,Control_RunDLL Appwiz.cpl,,2", 9)
'添加/删除程序属性-启动盘
Call Shell("rundll32.exe shell32.dll,Control_RunDLL Appwiz.cpl,,3", 9)
'显示属性-背景
Call Shell("rundll32.exe shell32.dll,Control_RunDLL desk.cpl,,0", 9)
'显示属性-屏幕保护程序
Call Shell("rundll32.exe shell32.dll,Control_RunDLL desk.cpl,,1", 9)
'显示属性-外观
Call Shell("rundll32.exe shell32.dll,Control_RunDLL desk.cpl,,2", 9)
'显示属性-设置
Call Shell("rundll32.exe shell32.dll,Control_RunDLL desk.cpl,,3", 9)
'Internet 属性-常规
Call Shell("rundll32.exe shell32.dll,Control_RunDLL Inetcpl.cpl,,0", 9)
'Internet 属性-安全
Call Shell("rundll32.exe shell32.dll,Control_RunDLL Inetcpl.cpl,,1", 9)
'Internet 属性-内容
Call Shell("rundll32.exe shell32.dll,Control_RunDLL Inetcpl.cpl,,2", 9)
'Internet 属性-连接
Call Shell("rundll32.exe shell32.dll,Control_RunDLL I
*****************************************************************
怎样关闭一个程序
你可以使用API函数FindWindow和PostMessage来寻找一个窗口并且关闭它。下面的范例演示如何关闭一个标题为"Calculator"的窗口。
Dim winHwnd As Long
Dim RetVal As Long
winHwnd = FindWindow(vbNullString, "Calculator")
Debug.Print winHwnd
If winHwnd <> 0 Then
RetVal = PostMessage(winHwnd, WM_CLOSE, 0&, 0&)
If RetVal = 0 Then
MsgBox "Error posting message."
End If
Else
MsgBox "The Calculator is not open."
End If

For this code to work, you must have declared the API functions in a module in your project. You must put the following in the declarations section of the module.

Declare Function FindWindow Lib "user32" Alias _
"FindWindowA" (ByVal lpClassName As String, _
ByVal lpWindowName As String) As Long
Declare Function PostMessage Lib "user32" Alias _
"PostMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, _
ByVal wParam As Long, lParam As Any) As Long
Public Const WM_CLOSE = &H10
*****************************************************************
如何使Form的背景图随Form大小改变
单纯显示图形用Image即可,而且用Image也正好可解决你的问题
设定Image的Stretch=true
在加入以下的code
Private Sub Form_Resize()
Image1.Move 0, 0, ScaleWidth, ScaleHeight
End Sub

或者使用以下的方式来做也可以

Private Sub Form_Paint()
Me.PaintPicture Me.Picture, 0, 0, ScaleWidth, ScaleHeight
End Sub
*************************************************************************
软件的注册
可用注册表简单地保存已用的天数或次数
'次数限制（如３０次）如下：
Private Sub Form_Load()
Dim RemainDay As Long
RemainDay = GetSetting("MyApp", "set", "times", 0)
If RemainDay = 30 Then
MsgBox "试用次数已满，请注册"
Unload Me
End If
MsgBox "现在剩下：" & 30 - RemainDay & "试用次数，好好珍惜！"
RemainDay = RemainDay + 1
SaveSetting "MyApp", "set", "times", RemainDay
End Sub

'时间限制的（如３０天）
Private Sub Form_Load()
Dim RemainDay As Long
RemainDay = GetSetting("MyApp", "set", "day", 0)
If RemainDay = 30 Then
    MsgBox "试用期已过，请注册"
    Unload Me
End If
MsgBox "现在剩下：" & 30 - RemainDay & "试用天数，好好珍惜！"
if day(now)-remainday>0 then RemainDay = RemainDay + 1
SaveSetting "MyApp", "set", "times", RemainDay
End Sub
*****************************************************************
MMControl控件全屏播放
Option Explicit
Private Declare Function mciSendString Lib "winmm.dll" _
        Alias "mciSendStringA" (ByVal lpstrCommand As _
        String, ByVal lpstrReturnString As Any, ByVal _
        uReturnLength As Long, ByVal hwndCallback As _
        Long) As Long

Private Declare Function mciSendCommand Lib "winmm.dll" _
        Alias "mciSendCommandA" (ByVal wDeviceID As Long, _
        ByVal uMessage As Long, ByVal dwParam1 As Long, _
        dwParam2 As MCI_OVLY_RECT_PARMS) As Long

Private Declare Function GetShortPathName Lib "kernel32" _
        Alias "GetShortPathNameA" (ByVal lpszLongPath As _
        String, ByVal lpszShortPath As String, ByVal _
        cchBuffer As Long) As Long

Private Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type

Private Type MCI_OVLY_RECT_PARMS
dwCallback As Long
rc As RECT
End Type

Const MCI_OVLY_WHERE_SOURCE = &H20000
Const MCI_OVLY_WHERE_DESTINATION = &H40000
Const MCI_WHERE = &H843

Dim Play As Boolean

Private Sub Form_Load()
MMControl1.Wait = True
MMControl1.UpdateInterval = 50
MMControl1.hWndDisplay = Picture1.hWnd
Picture1.ScaleMode = 3
Timer1.Interval = 50
End Sub

Private Sub Form_Unload(Cancel As Integer)
MMControl1.Command = "stop"
MMControl1.Command = "close"
End Sub

Private Sub Command1_Click()
MMControl1.Command = "stop"
MMControl1.Command = "close"
Play = False

CommonDialog1.Filter = ("VB-Dateien (*.avi)|*.avi;")
CommonDialog1.InitDir = App.Path
CommonDialog1.ShowOpen

If CommonDialog1.filename <> "" Then
    MMControl1.DeviceType = "avivideo"
    MMControl1.filename = CommonDialog1.filename
    MMControl1.Command = "open"
    MMControl1.Notify = True
    Label4.Caption = MMControl1.Length

    If Check2.Value = vbChecked And Option2 Then
      Call AdaptPicture
    End If

    If Option3.Value Then Call Option3_Click
    Me.Caption = CommonDialog1.filename
End If
End Sub

Private Sub Command2_Click()
If Not Option3.Value Then
    If Play = False And MMControl1.filename <> "" Then
      MMControl1.Command = "play"
      Play = True
    End If
Else
    Call Option3_Click
End If
End Sub

Private Sub Command3_Click()
Play = False
MMControl1.Command = "stop"
End Sub

Private Sub Command4_Click()
MMControl1.Command = "pause"
End Sub

Private Sub MMControl1_Done(NotifyCode As Integer)
If Play And Check1.Value = vbChecked Then
    Play = False
    MMControl1.Command = "stop"
    MMControl1.Command = "prev"
    MMControl1.Command = "play"
    Play = True
End If
End Sub

Private Sub MMControl1_StatusUpdate()
Label2.Caption = MMControl1.Position
End Sub

Private Sub Option1_Click()
Check1.Enabled = True
Check2.Enabled = False
MMControl1.hWndDisplay = 0
End Sub

Private Sub Option2_Click()
Check1.Enabled = True
Check2.Enabled = True
MMControl1.hWndDisplay = Picture1.hWnd
End Sub

Private Sub Option3_Click()‘－－－－－－－－－－－注意这里
Dim R&, AA$
    Check1.Enabled = False
    Check2.Enabled = False
    MMControl1.Command = "stop"
    Play = False

    AA = Space$(255)
    R = GetShortPathName(CommonDialog1.filename, AA, Len(AA))
    AA = Mid$(AA, 1, R)
    R = mciSendString("play " & AA & " fullscreen ", 0&, 0, 0&)
End Sub

Private Sub Check2_Click()
If Check2.Value = vbChecked And MMControl1.filename <> "" Then
Call AdaptPicture
End If
End Sub

Private Sub Timer1_Timer()
Dim x%, AA$
    x = MMControl1.Mode
    Select Case x
      Case 524: AA = "NotOpen"
      Case 525: AA = "Stop"
      Case 526: AA = "Play"
      Case 527: AA = "Record"
      Case 528: AA = "Seek"
      Case 529: AA = "Pause"
      Case 530: AA = "Ready"
    End Select
    Label6.Caption = AA
End Sub

Private Sub AdaptPicture()
Dim Result&, Par As MCI_OVLY_RECT_PARMS

    Par.dwCallback = MMControl1.hWnd
    Result = mciSendCommand(MMControl1.DeviceID, _
             MCI_WHERE, MCI_OVLY_WHERE_SOURCE, Par)
    If Result <> 0 Then
      MsgBox ("Fehler")
    Else
      Picture1.Width = (Par.rc.Right - Par.rc.Left) * 15 + 4 * 15
      Picture1.Height = (Par.rc.Bottom - Par.rc.Top) * 15 + 4 * 15
    End If
End Sub
******************************************************************
通用对话框专辑（全）
使用API调用Winodws各种通用对话框(Common Diaglog)的方法（一）

1.文件属性对话框
Type SHELLEXECUTEINFO
cbSize As Long
fMask As Long
hwnd As Long
lpVerb As String
lpFile As String
lpParameters As String
lpDirectory As String
nShow As Long
hInstApp As Long
lpIDList As Long '可选参数
lpClass As String '可选参数
hkeyClass As Long '可选参数
dwHotKey As Long '可选参数
hIcon As Long '可选参数
hProcess As Long '可选参数
End Type

Const SEE_MASK_INVOKEIDLIST = &HC
Const SEE_MASK_NOCLOSEPROCESS = &H40
Const SEE_MASK_FLAG_NO_UI = &H400

Declare Function ShellExecuteEX Lib "shell32.dll" Alias "ShellExecuteEx" _
(SEI As SHELLEXECUTEINFO) As Long
Public Function ShowProperties(filename As String, OwnerhWnd As Long) As Long
'打开指定文件的属性对话框,如果返回值<=32则出错
Dim SEI As SHELLEXECUTEINFO
Dim r As Long
With SEI
.cbSize = Len(SEI)
.fMask = SEE_MASK_NOCLOSEPROCESS Or SEE_MASK_INVOKEIDLIST Or SEE_MASK_FLAG_NO_UI
.hwnd = OwnerhWnd
.lpVerb = "properties"
.lpFile = filename
.lpParameters = vbNullChar
.lpDirectory = vbNullChar
.nShow = 0
.hInstApp = 0
.lpIDList = 0
End With
r = ShellExecuteEX(SEI)
ShowProperties = SEI.hInstApp
End Function

新建一个工程,添加一个按钮和名为Text1的文本框
把以下代码置入CommandbButton_Click 中
Dim r As Long
Dim fname As String
'从Text1 中获取文件名及路径
fname = (Text1)
r = ShowProperties(fname, Me.hwnd)
If r <= 32 Then MsgBox "Error"

2.使用Win95的关于对话框
Private Declare Function ShellAbout Lib "shell32.dll" _
Alias "ShellAboutA" (ByVal hwnd As Long, ByVal szApp As String, _
ByVal szOtherStuff As String, ByVal hIcon As Long) As Long
示例:
Dim x As Long
x = shellabout (Form1.hwnd, "Visual Basic 6.0", _
"Alp Studio MouseTracker Ver 1.0", Form1.icon)

2.调用"捕获打印机端口"对话框
Private Declare Function WNetConnectionDialog Lib "mpr.dll" _
(ByVal hwnd As Long, ByVal dwType As Long) As Long
示例:
Dim x As Long
x = WNetConnectionDialog(Me.hwnd, 2)

3.调用颜色对话框
Private Type ChooseColor
lStructSize As Long
hwndOwner As Long
hInstance As Long
rgbResult As Long
lpCustColors As String
flags As Long
lCustData As Long
lpfnHook As Long
lpTemplateName As String
End Type
Private Declare Function ChooseColor Lib "comdlg32.dll" Alias "ChooseColorA" (pChoosecolor As ChooseColor) As Long

将以下代码置入某一事件中:
Dim cc As ChooseColor
Dim CustColor(16) As Long
cc.lStructSize = Len(cc)
cc.hwndOwner = Form1.hWnd
cc.hInstance = App.hInstance
cc.flags = 0
cc.lpCustColors = String$(16 * 4, 0)
Dim a
Dim x
Dim c1
Dim c2
Dim c3
Dim c4
a = ChooseColor(cc)
Cls
If (a) Then
MsgBox "Color chosen:" & Str$(cc.rgbResult)

For x = 1 To Len(cc.lpCustColors) Step 4
c1 = Asc(Mid$(cc.lpCustColors, x, 1))
c2 = Asc(Mid$(cc.lpCustColors, x + 1, 1))
c3 = Asc(Mid$(cc.lpCustColors, x + 2, 1))
c4 = Asc(Mid$(cc.lpCustColors, x + 3, 1))
CustColor(x / 4) = (c1) + (c2 * 256) + (c3 * 65536) + (c4 * 16777216)
MsgBox "Custom Color " & Int(x / 4) & " = " & CustColor(x / 4)
Next x
Else
MsgBox "Cancel was pressed"
End If

4.调用复制磁盘对话框
Private Declare Function SHFormatDrive Lib "shell32" (ByVal hwnd As Long, ByVal Drive As Long, ByVal fmtID As Long, ByVal options As Long) As Long
Private Declare Function GetDriveType Lib "kernel32" Alias "GetDriveTypeA" (ByVal nDrive As String) As Long

示例:
向窗体中添加一个名为Drive1的DriveListBox,将以下代码置入某一事件中
Dim DriveLetter$, DriveNumber&, DriveType&
Dim RetVal&, RetFromMsg&
DriveLetter = UCase(Drive1.Drive)
DriveNumber = (Asc(DriveLetter) - 65)
DriveType = GetDriveType(DriveLetter)
If DriveType = 2 Then 'Floppies, etc
RetVal = Shell("rundll32.exe diskcopy.dll,DiskCopyRunDll " _
& DriveNumber & "," & DriveNumber, 1) 'Notice space after
Else ' Just in case 'DiskCopyRunDll
RetFromMsg = MsgBox("Only floppies can" & vbCrLf & _
"be diskcopied!", 64, "DiskCopy Example")
End If

5.调用格式化软盘对话框
Private Declare Function SHFormatDrive Lib "shell32" (ByVal hwnd As Long, ByVal Drive As Long, ByVal fmtID As Long, ByVal options As Long) As Long
Private Declare Function GetDriveType Lib "kernel32" Alias "GetDriveTypeA" (ByVal nDrive As String) As Long
参数设置:
fmtID-
3.5" 5.25"
-------------------------
0 1.44M 1.2M
1 1.44M 1.2M
2 1.44M 1.2M
3 1.44M 360K
4 1.44M 1.2M
5 720K 1.2M
6 1.44M 1.2M
7 1.44M 1.2M
8 1.44M 1.2M
9 1.44M 1.2M

选项
0 快速
1 完全
2 只复制系统文件
3 只复制系统文件
4 快速
5 完全
6 只复制系统文件
7 只复制系统文件
8 快速
9 完全
示例:要求同上
Dim DriveLetter$, DriveNumber&, DriveType&
Dim RetVal&, RetFromMsg%
DriveLetter = UCase(Drive1.Drive)
DriveNumber = (Asc(DriveLetter) - 65) ' Change letter to Number: A=0
DriveType = GetDriveType(DriveLetter)
If DriveType = 2 Then 'Floppies, etc
RetVal = SHFormatDrive(Me.hwnd, DriveNumber, 0&, 0&)
Else
RetFromMsg = MsgBox("This drive is NOT a removeable" & vbCrLf & _
"drive! Format this drive?", 276, "SHFormatDrive Example")
Select Case RetFromMsg
Case 6 'Yes
' UnComment to do it...
'RetVal = SHFormatDrive(Me.hwnd, DriveNumber, 0&, 0&)
Case 7 'No
' Do nothing
End Select
End If
-----------------------------------------------------------------------------
使用API调用Winodws各种通用对话框(Common Diaglog)的方法（二）

1.选择目录/文件夹对话框
将以下代码置于一模块中
Option Explicit
' 调用方式:: string = BrowseForFolders(Hwnd,TitleOfDialog)
' 例如:String1 = BrowseForFolders(Hwnd, "Select target folder...")
Public Type BrowseInfo
hwndOwner As Long
pIDLRoot As Long
pszDisplayName As Long
lpszTitle As Long
ulFlags As Long
lpfnCallback As Long
lParam As Long
iImage As Long
End Type
Public Const BIF_RETURNONLYFSDIRS = 1
Public Const MAX_PATH = 260
Public Declare Sub CoTaskMemFree Lib "ole32.dll" (ByVal hMem As Long)
Public Declare Function lstrcat Lib "kernel32" Alias "lstrcatA" (ByVal lpString1 As String, ByVal lpString2 As String) As Long
Public Declare Function SHBrowseForFolder Lib "shell32" (lpbi As BrowseInfo) As Long
Public Declare Function SHGetPathFromIDList Lib "shell32" (ByVal pidList As Long, ByVal lpBuffer As String) As Long

Public Function BrowseForFolder(hwndOwner As Long, sPrompt As String) As String
Dim iNull As Integer
Dim lpIDList As Long
Dim lResult As Long
Dim sPath As String
Dim udtBI As BrowseInfo
'初始化变量
With udtBI
.hwndOwner = hwndOwner
.lpszTitle = lstrcat(sPrompt, "")
.ulFlags = BIF_RETURNONLYFSDIRS
End With
'调用 API
lpIDList = SHBrowseForFolder(udtBI)
If lpIDList Then
sPath = String$(MAX_PATH, 0)
lResult = SHGetPathFromIDList(lpIDList, sPath)
Call CoTaskMemFree(lpIDList)
iNull = InStr(sPath, vbNullChar)
If iNull Then sPath = Left$(sPath, iNull - 1)
End If
'如果选择取消, sPath = ""
BrowseForFolder = sPath
End Function
2.调用"映射网络驱动器"对话框
Private/Public Declare Function WNetConnectionDialog Lib "mpr.dll" _
(ByVal hwnd As Long, ByVal dwType As Long) As Long
x% = WNetConnectionDialog(Me.hwnd, 1)
3.调用"打开文件"对话框
Private Type OPENFILENAME
lStructSize As Long
hwndOwner As Long
hInstance As Long
lpstrFilter As String
lpstrCustomFilter As String
nMaxCustFilter As Long
nFilterIndex As Long
lpstrFile As String
nMaxFile As Long
lpstrFileTitle As String
nMaxFileTitle As Long
lpstrInitialDir As String
lpstrTitle As String
flags As Long
nFileOffset As Integer
nFileExtension As Integer
lpstrDefExt As String
lCustData As Long
lpfnHook As Long
lpTemplateName As String
End Type
Private Declare Function GetOpenFileName Lib "comdlg32.dll" Alias "GetOpenFileNameA" (pOpenfilename As OPENFILENAME) As Long
将以下代码置于某一事件中
Dim ofn As OPENFILENAME
ofn.lStructSize = Len(ofn)
ofn.hwndOwner = Form1.hWnd
ofn.hInstance = App.hInstance
ofn.lpstrFilter = "Text Files (*.txt)" + Chr$(0) + "*.txt" + Chr$(0) + "Rich Text Files (*.rtf)" + Chr$(0) + "*.rtf" + Chr$(0)
ofn.lpstrFile = Space$(254)
ofn.nMaxFile = 255
ofn.lpstrFileTitle = Space$(254)
ofn.nMaxFileTitle = 255
ofn.lpstrInitialDir = curdir
ofn.lpstrTitle = "Our File Open Title"
ofn.flags = 0
Dim a
a = GetOpenFileName(ofn)
If (a) Then
MsgBox "File to Open: " + Trim$(ofn.lpstrFile)
Else
MsgBox "Cancel was pressed"
End If
4.调用"打印"对话框
Private Type PrintDlg
lStructSize As Long
hwndOwner As Long
hDevMode As Long
hDevNames As Long
hdc As Long
flags As Long
nFromPage As Integer
nToPage As Integer
nMinPage As Integer
nMaxPage As Integer
nCopies As Integer
hInstance As Long
lCustData As Long
lpfnPrintHook As Long
lpfnSetupHook As Long
lpPrintTemplateName As String
lpSetupTemplateName As String
hPrintTemplate As Long
hSetupTemplate As Long
End Type
Private Declare Function PrintDlg Lib "comdlg32.dll" Alias "PrintDlgA" (pPrintdlg As PrintDlg) As Long
'将以下代码置于某一事件中
Dim tPrintDlg As PrintDlg
tPrintDlg.lStructSize = Len(tPrintDlg)
tPrintDlg.hwndOwner = Me.hwnd
tPrintDlg.hdc = hdc
tPrintDlg.flags = 0
tPrintDlg.nFromPage = 0
tPrintDlg.nToPage = 0
tPrintDlg.nMinPage = 0
tPrintDlg.nMaxPage = 0
tPrintDlg.nCopies = 1
tPrintDlg.hInstance = App.hInstance
lpPrintTemplateName = "Print Page"
Dim a
a = PrintDlg(tPrintDlg)
If a Then
lFromPage = tPrintDlg.nFromPage
lToPage = tPrintDlg.nToPage
lMin = tPrintDlg.nMinPage
lMax = tPrintDlg.nMaxPage
lCopies = tPrintDlg.nCopies
PrintMyPage 'Custom printing Subroutine
End If
*************************************************************************
用 WinSock 控件下载文件
1 增加一个 Winsock 控件，名称为 Winsock1。
2 建立连接：
Winsock1.RemoteHost = "nease.com"
Winsock1.RemotePort = 80
Winsock1.Connect
3 在Winsock1.Connect 事件中加入：

Dim strCommand as String
Dim strWebPage as String
strWebPage = "http://www.nease.com/~kenj/index.html";
strCommand = "GET " + strWebPage + " HTTP/1.0" + vbCrLf
strCommand = strCommand + "Accept: */*" + vbCrLf
strCommand = strCommand + "Accept: text/html" + vbCrLf
strCommand = strCommand + vbCrLf
Winsock1.SendData strCommand
4 Winsock 开始下载，在收到数据时，发生DataArrival 事件。
Dim webData As String
Winsock1.GetData webData, vbString
TxtWebPage.Text = TxtWebPage.Text + webData
******************************************************
用VB实现客户——服务器（TCP/IP）编程实例
现在大多数语言都支持客户－服务器模式(C/S)编程，其中VB给我们提供了很好的客户－服务器编程方式。下面我们用VB来实现TCP／IP网络编程。
　　TCP／IP协议是Internet最重要的协议。VB提供了WinSock控件,用于在TCP／IP的基础上进行网络通信。当两个应用程序使用Socket进行网络通信时，其中一个必须创建Socket服务器侦听，而另一个必须创建Socket客户去连接服务器。这样两个程序就可以进行通信了。
　　1．创建服务器，首先创建一个服务端口号。并开始侦听是否有客户请求连接。
　　建立一窗体，并向其增加一个Winsock控件(可在工程菜单中的部件项来添加此控件)
　　添加两文本框Text1,Text2,和一按钮Command1
　　Private Sub Form_Load()
　　SockServer.LocalPort = 2000 ′服务器端口号,最好大于1000
　　SockServer.Listen ′开始侦听
　　End Sub
　　Private Sub Form_Unload(Cancel As Integer)
　　SockServer.Close
　　End Sub
　　Private Sub SockServer_Close()
　　SockServer.Close
　　End Sub
　　Private Sub SockServer_ConnectionRequest(ByVal requestID As Long)
　　SockServer.Close
　　SockServer.Accept requestID ′表示客户请求连接的ID号
　　End Sub
　　′当客户向服务器发送数据到达后,产生DataArrival事件,在事件中接收数据,GetData方法接收数据。
　　Private Sub SockServer_Data
Arrival(ByVal bytesTotal As Long)
　　Dim s As String
　　SockServer.GetData s
　　Text1.Text = s
　　End Sub
　　当我需要向客户发送数据时，只需调用SendData方法。
　　Private Sub Command1_Click()
　　SockServer .SendData Text2.Text
　　End Sub
　　2．创建客户。要创建客户连接服务器，首先设置服务器主机名，如IP地址、域名或计算机名，然后设置服务器端口，最后连接服务器。
　　建立一窗体，并向其增加一个Winsock控件(可在工程菜单中的部件项来添加此控件)，取名为：SockC1。添加两文本框Text1,Text2,和一按钮Command1
　　Private Sub Form_Load()
　　SockCl.RemoteHost =′127.0.0.1″
　　′表示服务器主机名
　　SockCl.RemotePort = 2000
　 ′表示服务器端口名
　　SockCl.Connect
′连接到服务器
　　End Sub
　　Private Sub Form_Unload(Cancel As Integer)
　　SockCl.Close
　　End Sub
　　Private Sub SockCl_Close()
　　SockCl.Close
　　End Sub
　　Private Sub SockCl_DataArrival(ByVal bytesTotal As Long)
　　Dim s As String
　　SockCl.GetData s ′接收数据到文本框中
　　Text1.Text = s
　　End Sub
　　Private Sub Command1_Click()
　　SockCl.SendData Text2.Text ′向服务器发送数据
　　End Sub
　　3．进行通信。把这两个窗体分别编译成两个EXE文件，服务器Server.exe和客户Client.exe程序，并把它们分别安装在服务器端和客户端，这样就可以实现两者通信了。
******************************************************************
PING一个IP地址(向它发送一个数据包并等待回应)
新建一个工程，添加一个标准模块，写入以下代码：
Option Explicit
Public Const IP_STATUS_BASE = 11000
Public Const IP_SUCCESS = 0
Public Const IP_BUF_TOO_SMALL = (11000 + 1)
Public Const IP_DEST_NET_UNREACHABLE = (11000 + 2)
Public Const IP_DEST_HOST_UNREACHABLE = (11000 + 3)
Public Const IP_DEST_PROT_UNREACHABLE = (11000 + 4)
Public Const IP_DEST_PORT_UNREACHABLE = (11000 + 5)
Public Const IP_NO_RESOURCES = (11000 + 6)
Public Const IP_BAD_OPTION = (11000 + 7)
Public Const IP_HW_ERROR = (11000 + 8)
Public Const IP_PACKET_TOO_BIG = (11000 + 9)
Public Const IP_REQ_TIMED_OUT = (11000 + 10)
Public Const IP_BAD_REQ = (11000 + 11)
Public Const IP_BAD_ROUTE = (11000 + 12)
Public Const IP_TTL_EXPIRED_TRANSIT = (11000 + 13)
Public Const IP_TTL_EXPIRED_REASSEM = (11000 + 14)
Public Const IP_PARAM_PROBLEM = (11000 + 15)
Public Const IP_SOURCE_QUENCH = (11000 + 16)
Public Const IP_OPTION_TOO_BIG = (11000 + 17)
Public Const IP_BAD_DESTINATION = (11000 + 18)
Public Const IP_ADDR_DELETED = (11000 + 19)
Public Const IP_SPEC_MTU_CHANGE = (11000 + 20)
Public Const IP_MTU_CHANGE = (11000 + 21)
Public Const IP_UNLOAD = (11000 + 22)
Public Const IP_ADDR_ADDED = (11000 + 23)
Public Const IP_GENERAL_FAILURE = (11000 + 50)
Public Const MAX_IP_STATUS = 11000 + 50
Public Const IP_PENDING = (11000 + 255)
Public Const PING_TIMEOUT = 200
Public Const WS_VERSION_REQD = &H101
Public Const WS_VERSION_MAJOR = WS_VERSION_REQD \ &H100 And &HFF&
Public Const WS_VERSION_MINOR = WS_VERSION_REQD And &HFF&
Public Const MIN_SOCKETS_REQD = 1
Public Const SOCKET_ERROR = -1

Public Const MAX_WSADes cription = 256
Public Const MAX_WSASYSStatus = 128

Public Type ICMP_OPTIONS
Ttl As Byte
Tos As Byte
Flags As Byte
OptionsSize As Byte
OptionsData As Long
End Type

Dim ICMPOPT As ICMP_OPTIONS

Public Type ICMP_ECHO_REPLY
Address As Long
status As Long
RoundTripTime As Long
DataSize As Integer
Reserved As Integer
DataPointer As Long
Options As ICMP_OPTIONS
Data As String * 250
End Type

Public Type HOSTENT
hName As Long
hAliases As Long
hAddrType As Integer
hLen As Integer
hAddrList As Long
End Type

Public Type WSADATA
wVersion As Integer
wHighVersion As Integer
szDes cription(0 To MAX_WSADes cription) As Byte
szSystemStatus(0 To MAX_WSASYSStatus) As Byte
wMaxSockets As Integer
wMaxUDPDG As Integer
dwVendorInfo As Long
End Type

Public Declare Function IcmpCreateFile Lib "icmp.dll" () As Long
Public Declare Function IcmpCloseHandle Lib "icmp.dll" (ByVal IcmpHandle As Long) As Long
Public Declare Function IcmpSendEcho Lib "icmp.dll" (ByVal IcmpHandle As Long, ByVal DestinationAddress As Long, ByVal RequestData As String, ByVal RequestSize As Integer, ByVal RequestOptions As Long, ReplyBuffer As ICMP_ECHO_REPLY, ByVal ReplySize As Long, ByVal Timeout As Long) As Long
Public Declare Function WSAGetLastError Lib "WSOCK32.DLL" () As Long
Public Declare Function WSAStartup Lib "WSOCK32.DLL" (ByVal wVersionRequired As Long, lpWSADATA As WSADATA) As Long
Public Declare Function WSACleanup Lib "WSOCK32.DLL" () As Long
Public Declare Function gethostname Lib "WSOCK32.DLL" (ByVal szHost As String, ByVal dwHostLen As Long) As Long
Public Declare Function gethostbyname Lib "WSOCK32.DLL" (ByVal szHost As String) As Long
Public Declare Sub RtlMoveMemory Lib "kernel32" (hpvDest As Any, ByVal hpvSource As Long, ByVal cbCopy As Long)

Public Function GetStatusCode(status As Long) As String

Dim msg As String

Select Case status
Case IP_SUCCESS: msg = "ip success"
Case IP_BUF_TOO_SMALL: msg = "ip buf too_small"
Case IP_DEST_NET_UNREACHABLE: msg = "ip dest net unreachable"
Case IP_DEST_HOST_UNREACHABLE: msg = "ip dest host unreachable"
Case IP_DEST_PROT_UNREACHABLE: msg = "ip dest prot unreachable"
Case IP_DEST_PORT_UNREACHABLE: msg = "ip dest port unreachable"
Case IP_NO_RESOURCES: msg = "ip no resources"
Case IP_BAD_OPTION: msg = "ip bad option"
Case IP_HW_ERROR: msg = "ip hw_error"
Case IP_PACKET_TOO_BIG: msg = "ip packet too_big"
Case IP_REQ_TIMED_OUT: msg = "ip req timed out"
Case IP_BAD_REQ: msg = "ip bad req"
Case IP_BAD_ROUTE: msg = "ip bad route"
Case IP_TTL_EXPIRED_TRANSIT: msg = "ip ttl expired transit"
Case IP_TTL_EXPIRED_REASSEM: msg = "ip ttl expired reassem"
Case IP_PARAM_PROBLEM: msg = "ip param_problem"
Case IP_SOURCE_QUENCH: msg = "ip source quench"
Case IP_OPTION_TOO_BIG: msg = "ip option too_big"
Case IP_BAD_DESTINATION: msg = "ip bad destination"
Case IP_ADDR_DELETED: msg = "ip addr deleted"
Case IP_SPEC_MTU_CHANGE: msg = "ip spec mtu change

'一条代码得到本机IP地址
在工程->部件中加载 Microsoft Winsock Control 6.0 控件
Text1.text=Winsock1.localip
***********************************************************
将程序从任务列表中隐藏
将你的程序从Windows的系统任务列表中隐藏(即CTRL+ALT+DEL出来的框)

'复制以下代码到一模块中

Declarations
Public Declare Function GetCurrentProcessId Lib "kernel32" () As Long
Public Declare Function GetCurrentProcess Lib "kernel32" () As Long
Public Declare Function RegisterServiceProcess Lib "kernel32" (ByVal dwProcessID As Long, ByVal dwType As Long) As Long
Public Const RSP_SIMPLE_SERVICE = 1
Public Const RSP_UNREGISTER_SERVICE = 0

'下面代码为隐藏
Public Sub MakeMeService()
Dim pid As Long
Dim reserv As Long
pid = GetCurrentProcessId()
regserv = RegisterServiceProcess(pid, RSP_SIMPLE_SERVICE)
End Sub

'恢复隐藏
Public UnMakeMeService()
Dim pid As Long
Dim reserv As Long
pid = GetCurrentProcessId()
regserv = RegisterServiceProcess(pid, RSP_UNREGISTER_SERVICE)
End Sub
******************************************************
如何在窗体中平铺图片？
　本文介绍怎样用一个图片（例如BMP）平铺在窗口并完全覆盖它。
　　我们常常有需要使用一幅小图去覆盖一个窗口或者窗口的一部分。这正是设计那些小图的目的。它们以原来的尺寸作为背景排列在要覆盖的窗口上，这种技术就叫“平铺”。
　　VB没有提供平铺图片到窗口的标准功能。要做到这点，我们必须使用WINDOWS API和一些图形技术。
　　操作步骤：
　　1、建立一个新工程项目，缺省建立窗体FORM1
　　2、添加一个新模体
　　3、粘贴下面代码到新模体
Option Explicit
Declare Function BitBlt Lib "gdi32" (ByVal hDestDC As Long, ByVal x As Long, _
　ByVal y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hSrcDC As Long, _
　ByVal xSrc As Long, ByVal ySrc As Long, ByVal dwRop As Long) As Long
Declare Function GetDC Lib "user32" (ByVal hwnd As Long) As Long
Public RetValue As Long
Public Sub TileWindow(WindowObject As Object, p As PictureBox)
　　Dim j As Integer, i As Integer
　　Dim x As Integer
　　Dim WhDC As Long
　　' This object can be any VB standard object with an hWnd property
　　WhDC = GetDC(WindowObject.hwnd)
　　For j = 0 To WindowObject.Height Step p.ScaleHeight
　　　　For i = 0 To WindowObject.Width Step p.ScaleWidth
　　　　　　x = BitBlt(WhDC, i, j, p.ScaleWidth, p.ScaleHeight, p.hDC, 0, 0, vbSrcCopy)
　　　　Next
　　Next
End Sub
　　4、添加一个图片框控件（PICUTRE1），设置其SCALEMODE属性=3-PIXEL，AUTOREDRAW属性=TURE，AUTOSIZE属性=TURE。在PICTURE属性中选择一幅图。
　　5、添加以下代码到FORM1的PAINT事件：
Private Sub Form_Paint()
　　TileWindow Me, Picture1
End Sub
　　6、保存工程项目
　　7、运行程序。当显示出窗体后，可以看到图片“平铺”到整个窗体。
　　注意：尽管这种方法显示能够在任何支持hWnd属性的控件上平铺图片，但仍必须留意哪些控件支持PAINT方法
*************************************************************
制作拖盘
Public Const MAX_TOOLTIP As Integer = 64
Public Const NIF_ICON = &H2
Public Const NIF_MESSAGE = &H1
Public Const NIF_TIP = &H4
Public Const NIM_ADD = &H0
Public Const NIM_DELETE = &H2
Public Const WM_MOUSEMOVE = &H200
Public Const WM_LBUTTONDOWN = &H201
Public Const WM_LBUTTONUP = &H202
Public Const WM_LBUTTONDBLCLK = &H203
Public Const WM_RBUTTONDOWN = &H204
Public Const WM_RBUTTONUP = &H205
Public Const WM_RBUTTONDBLCLK = &H206

Public Const SW_RESTORE = 9
Public Const SW_HIDE = 0

Public nfIconData As NOTIFYICONDATA

Public Type NOTIFYICONDATA
   cbSize As Long
   hWnd As Long
   uID As Long
   uFlags As Long
   uCallbackMessage As Long
   hIcon As Long
   szTip As String * MAX_TOOLTIP
End Type

Public Declare Function ShowWindow Lib "user32" (ByVal hWnd As Long, ByVal nCmdShow As Long) As Long
Public Declare Function Shell_NotifyIcon Lib "shell32.dll" Alias "Shell_NotifyIconA" (ByVal dwMessage As Long, lpData As NOTIFYICONDATA) As Long

以下在form_load里初始化
With nfIconData
     .hWnd = Me.hWnd
     .uID = Me.Icon
     .uFlags = NIF_ICON Or NIF_MESSAGE Or NIF_TIP
     .uCallbackMessage = WM_MOUSEMOVE
     .hIcon = Me.Icon.Handle
     '定义鼠标移动到托盘上时显示的Tip
     .szTip = App.Title & "V" & App.Major & "." & App.Minor & "." & App.Revision & " Build:0825" & vbNullChar
     .cbSize = Len(nfIconData)
   End With
   Call Shell_NotifyIcon(NIM_ADD, nfIconData)
'以下在mousemove
Dim lMsg As Single
   lMsg = x / Screen.TwipsPerPixelX
   Select Case lMsg
     Case WM_LBUTTONUP
       'MsgBox "请用鼠标右键点击图标!", vbInformation, "天倚之音"
       '单击左键，显示窗体
       ShowWindow Me.hWnd, SW_RESTORE
       '下面两句的目的是把窗口显示在窗口最顶层
       'Me.Show
       'Me.SetFocus
       '' Case WM_RBUTTONUP
        ''PopupMenu frmmnu.mnulstsong '如果是在系统Tray图标上点右键，则弹出菜单mnulstsong
       '' Case WM_MOUSEMOVE
       '' Case WM_LBUTTONDOWN
       '' Case WM_LBUTTONDBLCLK
       '' Case WM_RBUTTONDOWN
       '' Case WM_RBUTTONDBLCLK
       '' Case Else
   End Select
'以下在窗体关闭（程序结束时）保证托盘图标消失
Call Shell_NotifyIcon(NIM_DELETE, nfIconData)   '拖盘相关调用
******************************************************************
一个API一行代码实现 XP风格控件
'声明
Private Declare Sub InitCommonControls Lib "comctl32.dll" ()

Private Sub Form_Initialize()
InitCommonControls
End Sub

比如生成的可执行文件名为：
test.exe
在该文件同一目录下新建立一个文本文件文本文件里输入以下内容

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>

<assemblyIdentity

version="1.0.0.0"

processorArchitecture="X86"

name="CompanyName.ProductName.YourApp"

type="win32"

<description>Your application description here.</description>

<assemblyIdentity

type="win32"

name="Microsoft.Windows.Common-Controls"

version="6.0.0.0"

processorArchitecture="X86"

publicKeyToken="6595b64144ccf1df"

language="*"

</dependentAssembly>

</dependency>

</assembly>

最后将这个文本文件改名为：test.exe.manifest
现在大家在打开test.exe 发现窗体上的空件都变成XP风格的了
**********************************************************
改变文件的属性
语法
SetAttr pathname, attributes

pathname 必要参数。用来指定一个文件名的字符串表达式，可能包含目录或文件夹、以及驱动器。
Attributes 必要参数。常数或数值表达式，其总和用来表示文件的属性。

attributes 参数设置可为：
常数       值   描述
vbNormal   0   常规（缺省值）
VbReadOnly 1   只读。
vbHidden   2   隐藏。
vbSystem   4   系统文件
vbArchive 32 上次备份以后，文件已经改变

举例：
setattr "c:\123.txt",VbReadOnly+vbHidden
将123这个文本文件设置成只读和隐藏属性~

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VB常用代码总结 2006-12-23 16:19:00

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