VBÔõÑùÅжϡ¢·ÀÖ¹³ÌÐòÖØ¸´Ö´ÐÐ
Private Sub Form_load()
'ÅжϳÌÐòÊÇ·ñÒѾÔËÐÐ
If App.PrevInstance
Then
MsgBox "±¾³ÌÐòÒѾÔËÐУ¡", vbInformation Or vbOKOnly, "ÌáʾÐÅÏ¢"
Unload
Me
Exit Sub
End If
'ÒÔÏÂÊÇÖ÷Òª³ÌÐò
' ……
End
Sub
¸½£ºÁíÒ»¸öÀý×Ó£º
Option Explicit
Public Sub CheckExist(fm
As Form) '·ÀÖ¹³ÌÐòÖØ¸´Ö´ÐÐ
Dim title As String
If App.PrevInstance
Then
title = App.title
Call MsgBox("Õâ³ÌÐòÒÑÖ´ÐÐ",
vbCritical)
App.title = "" 'Èç´Ë²Å²»»á Avtivate µ½×Ô¼º
fm.Caption =
""
AppActivate title 'activate ÏÈǰ¾ÍÒÑÔËÐеijÌÐò
End ' ½áÊø
End
If
End Sub
Private Sub Form_Load()
Call
CheckExist(Me)
End Sub
Ïà¹ØÎĵµ£º
ÈçºÎÈ¥ÓÅ»¯ÄãµÄVB³ÌÐò°ïÖú
1¡¢ÈçºÎÈ¥ÓÅ»¯ÄãµÄVB³ÌÐò
Visual Basic ×÷ΪһÖָ߼¶±à³ÌÓïÑÔ£¬ËüÒ²ÓÐ×Ų»¿É±ÜÃâµÄȱµã---¿ª·¢³öµÄÓ¦ÓóÌÐòÔËÐÐËÙ¶ÈÂý¡£Èç¹ûÎÒÃÇÄܹ»³ÌÐò×öһЩÓÅ»¯£¬ÄÇôÇé¿ö½«»á´ó´ó¸ÄÉÆ¡£ÒªÓÅ»¯³ÌÐòÔËÐеÄʵ¼ÊËÙ¶È£¬³£Óõķ½·¨ÓÐÈýÖÖ£º
1.¾¡Á¿±ÜÃâʹÓà Variant ±äÁ¿¡£ÓÉÓÚVB²»ÄÜÈ·¶¨ Variant ±äÁ¿µÄ¾ ......
Option Explicit
Private Const INTERNET_OPEN_TYPE_DIRECT = 1
Private Const scuseragent = "vb wininet"
Private Const INTERNET_FLAG_PASSIVE = &H8000000
'µ÷ÓÃÉèÖû·¾³
Private Declare Function InternetOpen Lib "wininet.dll" Alias "InternetOpenA" (ByVal sAgent As String, ByVal lAccessType As Long ......
MSComm¿Ø¼þÌṩÁËÁ½ÖÖ´¦ÀíͨÐŵķ½Ê½£ºÒ»ÖÖΪʼþÇý¶¯·½Ê½£¬¸Ã·½Ê½Ï൱ÓÚÒ»°ã³ÌÐòÉè¼ÆÖеÄÖжϷ½Ê½¡£µ±´®¿Ú·¢Éúʼþ»ò´íÎóʱ£¬MSComm¿Ø¼þ»á²úÉúOnCommʼþ£¬Óû§³ÌÐò¿ÉÒÔ²¶»ñ¸Ãʼþ½øÐÐÏàÓ¦´¦Àí¡£±¾ÎĵÄÁ½¸öÀý×Ó¾ù²ÉÓø÷½Ê½¡£ÁíÒ»ÖÖΪ²éѯ·½Ê½£¬ÔÚÓû§³ÌÐòÖÐÉè¼Æ¶¨Ê±»ò²»¶¨Ê±²éѯ MSComm¿Ø¼þµÄijЩÊôÐÔÊÇ·ñ·¢Éú±ä»¯£¬´Ó¶øÈ ......
VB ×¢ÊͳÌÐò´úÂëµÄ·ûºÅÊÇ '£¬Ö»ÒªÔÚijÐгÌÐòÇ°Ãæ¼ÓÉϸ÷ûºÅ¾Í¿ÉÒÔ×¢Ê͸ÃÐгÌÐò¡£µ«Èç¹û³ÌÐò´úÂëÓï¾äºÜ¶àµÄʱºò£¬Ò»ÐÐÒ»ÐеØ×¢Ê;ͷdz£²»·½±ã¡£Æäʵ VB
±¾ÉíÌṩÁËÒ»´ÎÐÔ×¢ÊͶàÌõÓï¾äµÄ¹¦ÄÜ£ºÔÚÖ÷²Ëµ¥“ÊÓͼ”Ñ¡ÏîµÄ“¹¤¾ßÀ¸”Ï£¬Ñ¡ÖГ±à¼”£¬VB
µÄ½çÃæ»á³öÏÖÒ»ÅŹ¤¾ß°´Å¥£¬ÆäÖоÍÓÐÓà ......