如何用VB获取屏幕信息

Question

我想用VB实现将屏幕上显示的内容中包含的文字信息读取下来,放在一个变量里.
这个功能和金山词霸里鼠标取词差不多. 不过我不知道如何去做.

Answer 1

在有些软件里当鼠标移到某单词上,其注释就会显示单词的中文解释.这样的软件是如何制作的呢?下面我就介绍以下获取鼠标所在单词的方法,至于中文结实要关系到数据库及字库问题在此我不做解释.
首先建立新工程,在FORM上添加一个TEXT文本框.
声明SendMessage函数.
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 EM_CHARFORMPOS=&HD7注释：在API浏览器里无此值请自己加上.

自定义过程:
Private Sub Text1_MouseDown(Button As Intege,Shift As Integer,x As Single, y As Single)
注释：获取鼠标所点的是第几行第几个字符
Dim pos As Long,Lc As Long
Dim Line As Integer,CharPos As Integer

x=x/Screen.TwipsPerPixelX
y=y/Screen.TwipsperPixelY
pos=x+y*65536
Lc=SendMessage(Text1.hwnd,EM_CHARFROMPOS,0,ByVal pos)

Line=Lc65536 注释：第几行
CharPos=Lc MOD 65536 注释：第几个字符
End Sub
注释：接下来才是真正的读取函数
Function GetWord(txt As TextBox,pos As Integer) As String
Dim bArr()As Byte,pos1 As Integer,pos2 As Integer, i As Integer

bArr=StrConv(txt.Text,vbFromUnicode)注释：转换成Byte数组
pos1=0:pos2=UBound(bArr)

注释：向前搜索分格符的位置
For i=pos-1 To 0 Step -1
If IsDelimiter(bArr(i)) Then
pos1=i+1
Exit For
End If
Next
注释：向后搜寻分隔符字符的位置
For i=pos To UBound(bArr)
If IsDelimiter(bArr(i)) Then
pos2=i-1
Exit For
End If
Next
注释：截取pos1-pos2之间的字符,以构成一个单词
If pos2>pos1 Then
ReDim bArr2(pos2-pos1) As Byte
For i=pos1 To Pos2
bArr2(i-pos1)=bArr(i)
Next

GetWord=StrConv(bArr2,vbUnicode)
Else
GetWord=""
End If
End Function
注释：IsDelimiter函数
Functon IsDelimiter(ByVal Char As Byte) As Boolean
Dim S As String

S=Chr(Char)
IsDelimiter=False
If S=" " Or S="," Or S="." Or S="?" Or S="vbCr Or S=vbLf Then
IsDelimiter=True
End If
End Function