VB中根据文本行数显示滚动条(动态显示滚动条)的方法
很多时候,我们不想一开始就显示滚动条,当文本到达指定行数文本框无法完全显示的时候再显示它,由于Scrollbar属性是只读的,无法在运行时的代码中改变这个属性,只能使用下面的API实现这个功能:
Public Declare Function ShowScrollBar Lib "user32" (ByVal hwnd As Long, ByVal wBar As Long, ByVal bShow As Long) As Long
Public Const SB_HORZ = 0 '水平
Public Const SB_VERT = 1 '垂直
Public Const SB_BOTH = 3 '两者都有
在Change事件中,调用就可以了:
Private bShow As Boolean '是否已经改变Scrollbars属性,你也可以省略这个控制
Private Sub txtText_Change()
txtText.SelStart = Len(txtText.Text)
If bShow = True Then Exit Sub '读取一个变量的速度要比读取一个属性快,看下C++
If TextHeight(txtText.Text) > txtText.Height Then
ShowScrollBar txtText.hwnd, SB_VERT, True
bShow = True '下次不用再判断
End If
End Sub
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VB中 Replace 函数
描述
返回字符串，其中指定数目的某子字符串被替换为另一个子字符串。
语法
Replace(expression, find, replacewith[, compare[, count[, start]]])
Replace 函数的语法有以下参数：
参数 描述
expression 必选。字符串表达式，包含要替换的子字符串。
find 必选。被搜索的子字符串。
......
Private Declare Function ExitWindowsEx Lib "user32" (ByVal uFlags As Long, ByVal dwReserved As Long) As Long
Private Const EWX_LOGOFF = 0
Private Const EWX_SHUTDOWN = 1
Private Const EWX_REBOOT = 2
Private Const EWX_FORCE = 4
Private closeTime As String
Sub AdjustTokenPrivilegesForNT()
......
VB显示透明FLASH效果
演示效果：
代码如下：
公共声明区域
Option Explicit
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 "SetW ......
主窗体代码：
'打开网页
Private Declare Function ShellExecute Lib "shell32.dll" Alias "ShellExecuteA" (ByVal hwnd As Long, ByVal lpOperation As String, ByVal lpFile As String, ByVal lpParameters As String, ByVal lpDirectory As String, ByVal nShowCmd As Long) As Long
'复制文件
Private Declare Fu ......
Private Declare Function InternetSetCookie Lib "wininet.dll" Alias "InternetSetCookieA" (ByVal lpszUrlName As String, ByVal lpszCookieName As String, ByVal lpszCookieData As String) As Boolean
Private Declare Function InternetGetCookie Lib "wininet.dll" Alias "InternetGetCookieA" (ByVal lpszUrlName ......
