05.txt

介绍VB里的各种控件的使用方法,窗口控制,图像编程以及OCX等内容,还提供了一个API集供参考.

Combo的自动查询技术 
Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal 
hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) 
As Long
Public Const CB_FINDSTRING = &H14C
Private Sub Combo1_Change()
Dim iStart As Integer
Dim sString As String
Static iLeftOff As Integer
iStart = 1
iStart = Combo1.SelStart
If iLeftOff <> 0 Then
Combo1.SelStart = iLeftOff
iStart = iLeftOff
End If
sString = CStr(Left(Combo1.Text, iStart))
Combo1.ListIndex = SendMessage(Combo1.hwnd,B_FINDSTRING, -1, ByVal CStr(
Left( ombo1.Text, iStart)))
　
If Combo1.ListIndex = -1 Then
iLeftOff = Len(sString)
combo1.Text = sString
End If
Combo1.SelStart = iStart
iLeftOff = 0
End Sub
静态变量 iLeftOff 指定了字符长度。