Vb net combobox validating event

The argument b is the value, in the range 0-255, to be sent. Be careful when using this function, because by writing directly to the hardware it bypasses the Windows safety nets.

vb net combobox validating event-45

Column 7 (April/May 1997): Active X Programming, part 1. Column 5 (December/January 1997): Using the Tree View control.

(March/April 1999) VBScript and Active Server Pages for Easy Web Database Programming. (January/February 1999) Visual Basic and the Common Gateway Interface. (November/December 1998) Object oriented file access. Column 8 (June/July 1997): Active X programming, part 2.

You can disable context menus, and can disable all or selected accelerator keys.

The tool is called WBCustomizer and is available by downloading from

If you need to retrieve HTML pages, you can do so easily by calling some functions in the Win Inet library. First, put the following declarations in your project (in a code module): Public Const INTERNET_OPEN_TYPE_PRECONFIG = 0 Public Const INTERNET_OPEN_TYPE_DIRECT = 1 Public Const INTERNET_OPEN_TYPE_PROXY = 3 Public Const sc User Agent = "VB Open Url" Public Const INTERNET_FLAG_RELOAD = &H80000000 Public Declare Function Internet Open Lib "wininet.dll" Alias "Internet Open A" _ (By Val s Agent As String, By Val l Access Type As Long, By Val s Proxy Name As String, _ By Val s Proxy Bypass As String, By Val l Flags As Long) As Long Public Declare Function Internet Open Url Lib "wininet.dll" Alias "Internet Open Url A" _ (By Val h Open As Long, By Val s Url As String, By Val s Headers As String, _ By Val l Length As Long, By Val l Flags As Long, By Val l Context As Long) As Long Public Declare Function Internet Read File Lib "wininet.dll" _ (By Val h File As Long, By Val s Buffer As String, By Val l Num Bytes To Read As Long, _ l Number Of Bytes Read As Long) As Integer Public Declare Function Internet Close Handle Lib "wininet.dll" _ (By Val h Inet As Long) As Integer Private Function Get HTMLFrom URL(s Url As String) As String Dim s As String Dim h Open As Long Dim h Open Url As Long Dim b Do Loop As Boolean Dim b Ret As Boolean Dim s Read Buffer As String * 2048 Dim l Number Of Bytes Read As Long h Open = Internet Open(sc User Agent, INTERNET_OPEN_TYPE_PRECONFIG, vb Null String, vb Null String, 0) h Open Url = Internet Open Url(h Open, s Url, vb Null String, 0, INTERNET_FLAG_RELOAD, 0) b Do Loop = True While b Do Loop s Read Buffer = vb Null String b Ret = Internet Read File(h Open Url, s Read Buffer, Len(s Read Buffer), l Number Of Bytes Read) s = s & Left$(s Read Buffer, l Number Of Bytes Read) If Not CBool(l Number Of Bytes Read) Then b Do Loop = False Wend If h Open Url While Visual Basic makes some things very easy, other things are ridiculously difficult.

For example, sending raw data to the printer port seems to be impossible.

I have not tested this, but Kris says it works fine.

Public Type DOCINFO p Doc Name As String p Output File As String p Datatype As String End Type Public Declare Function Close Printer Lib "winspool.drv" (By Val _ h Printer As Long) As Long Public Declare Function End Doc Printer Lib "winspool.drv" (By Val _ h Printer As Long) As Long Public Declare Function End Page Printer Lib "winspool.drv" (By Val _ h Printer As Long) As Long Public Declare Function Open Printer Lib "winspool.drv" Alias _ "Open Printer A" (By Val p Printer Name As String, ph Printer As Long, _ By Val p Default As Long) As Long Public Declare Function Start Doc Printer Lib "winspool.drv" Alias _ "Start Doc Printer A" (By Val h Printer As Long, By Val Level As Long, _ p Doc Info As DOCINFO) As Long Public Declare Function Start Page Printer Lib "winspool.drv" (By Val _ h Printer As Long) As Long Public Declare Function Write Printer Lib "winspool.drv" (By Val _ h Printer As Long, p Buf As Any, By Val cd Buf As Long, _ pc Written As Long) As Long Dim lh Printer As Long Dim l Return As Long Dim lpc Written As Long Dim l Doc As Long Dim s Writte Rdata As String Dim My Doc Info As DOCINFO l Return = Open Printer(Printer.

Sometimes the Open URL method does not retrieve an entire page.

Tags: , ,