VB编程技巧3例

 

    一、利用API 获取窗口的标题新建窗体Form1和按钮Command1在窗体模块中添加如下代码:
Option Explicit
Private Declare Function Get WindowText Lib "us—
er32"Alias "Get WindowTextA"(ByVal hwnd As
Long ,ByVal lpString As String ,ByVal cch As
Long)As Long
'在窗体声明节中加入API 函数“Get WindowText”的说明
'函数将向lpstring 中载入要获得的窗体caption
Private Sub Command1_Click()
Di mreturncode As Long
Di mcaptext As String
Di mcaplen As Long
captext =String$(100,0)
caplen =99
returncode =Get WindowText(ByVal me .hwnd ,
ByVal captext ,ByVal caplen)
print returncode
Print captext
Print caplen
End Sub
   二、获取鼠标在当前窗口(客户区)的屏幕坐标建立一新项目窗体form1并添加控件文本框Text1、Text2在窗体模块中输入:
Option Explicit
Private Declare Function GetCursorPos Lib "user32"
(lpPoint As POINTAPI)As Long
Private Type POINTAPI
XAs Long Y As Long
End Type
Di mpt As POINTAPI
Di mreturncode As Long
Private Sub Form_Load()
Text1.Text =""
Text2.Text =""
MaxButton =False
MinButton =False
Form1.WindowState =2
End Sub
Private Sub Form_MouseMove(Button As Integer ,
Shift As Integer ,XAs Single ,Y As Single)
'注意pt 结构是按引用传递的
returncode =GetCursorPos(pt)
Text1.Text =pt .X
Text2.Text =pt .Y
End Sub
   三、记录Wi ndows 使用时间
建立新项目窗口form1,输入代码:
Private Sub Form_Load()
form1.visible =false
Open app .paht +"memo .txt"For Append As #1
Print #1,"启动windows :"&CStr(Now)
Close #1
End Sub
Private Sub Form_Unload(Cancel As Integer)
Open app .paht +"memo .txt"For Append As #1
Print #1,"关闭windows :"&CStr(Now)
Close #1
End
End Sub
 最后将此程序加入启动组即可。(北京董鹏)

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