Using the NetMessageBufferSend to send messages on the network -- Visual FoxPro : Using Win32 (WinAPI) Functions


	Using Win32 functions in Visual FoxPro	Image Gallery




functions • examples • solutions • updates • about •	links • articles •	login •


	Code examples:

	Converting path to original case



	Copying picture of the active form to the Clipboard using Enhanced Metafile API functions



	How to make application automatically close all documents it opened



	Downloading files from the FTP server using InternetReadFile



	Encapsulating access to the Windows Services in a class



	Reading and setting Environment variables



	Sending email messages with Simple MAPI



	Creating an Open dialog box to specify the drive, directory, and name of a file to open (Shell32 version)



	How to download this reference`s archive through WinInet functions using InternetOpenUrl



	How to find the application associated with a file name



	Using FoxTray ActiveX control: System Tray Icon and menu attached to VFP form



	Using the DeleteFile



	How to retrieve the number of print jobs queued for the printer



	Placing a button on the VFP form as a new child window



	DiskFreeSpace class



	How to block the PrintScreen key



	Using the CreateFile



	Connecting a local device to a network resource



	Enumerating print jobs and retrieving information for default printer (JOB_INFO_1 structures)



	How to print a bitmap file



	Printing Image File, programmatically set print page orientation to landscape



	Printf-style formatted text output in VFP



	Using Month Calendar Control (VFP9, Comctl32.dll)



	Wininet last error description



	Other pages with examples: << >> 1 2 3 [4] 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

Using the NetMessageBufferSend to send messages on the network

User rating: 0/10 (0 votes)

Rate this code sample:

More code examples Listed functions Add comment W32 Constants Translate this page

Versions:
click to open

Before you begin:

This example shows how to broadcast system alerts using the NetMessageBufferSend as an alternative to NET SEND command.

On Windows XP computer, make sure that the Messenger service is running:

If the Messenger service is not running, upon creating an instance of the NetMessages object you will get error code 2184 (The service has not been started).

If a service is stopped and not disabled, you can start it programmatically using VFP Windows Services class library :

#DEFINE SERVICE_WIN32 0x30
#DEFINE SERVICE_RUNNING 4

LOCAL ws As winservices, srv As winservice
ws = CREATEOBJECT("winservices",;
        Null, Null, SERVICE_WIN32)

srv = ws.GetService("Messenger")
IF srv.currentstate <> SERVICE_RUNNING
        = MESSAGEBOX("The Messenger service is off!")
*        srv.StartService
ENDIF

Peer-to-peer LAN messenger built with Mailslot API functions

How to create non-blocking Winsock server

A client for testing non-blocking Winsock server

Using WM_COPYDATA for interprocess communication


	Members area. Log in to view this example.

		Sign up for the Membership

User rating: 0/10 (0 votes)

Rate this code sample:

4070 bytes
Created: 2005-09-14 13:41:48
Modified: 2011-12-10 09:20:22
Visits in 7 days: 125

Listed functions:

GetLastError
NetApiBufferFree
NetApiBufferSize
NetMessageBufferSend
NetMessageNameAdd
NetMessageNameDel
NetMessageNameEnum

My comment:

Note that this code sample does not work on Win9* computers.

Sending a message:

obj = CREATEOBJECT("NetMessages")
IF obj.errorno = 0
obj.SendMessage("WKSTATION1", "Test message")
ENDIF

Sending a message from a server (must have admin rights):

obj = CREATEOBJECT("NetMessages", "MYSERVER")
IF obj.errorno = 0
obj.SendMessage("WKSTATION1", "Test message")
ENDIF

Sending a message to all domain computers (note an asterick after the domain name):

obj = CREATEOBJECT("NetMessages")
IF obj.errorno = 0
obj.SendMessage("MYDOMAIN*", "Test message")
ENDIF

Sometimes it takes time for the NetMessageBufferSend to return control. The mailslot approach turns around much faster.

Use [domain name]* to broadcast a message to all domain computers.

On the target computer, TCP port 139 (NetBIOS) is assigned to receive messages.

* * *
C# version contains classes NetMessage and NetMessageThread.

The first class sends messages while staying in the main thread of the calling process. Exactly as FoxPro does. It causes the process wait until the NetMessageBufferSend returns. Sometimes this delay becomes noticeable -- up to 1 minute -- especially when the message receipient is disconnected or the network name is invalid or does not exist.

The NetMessageThread class sends messages using a separate thread it creates for each message. The calling process immediately gets the control back, because the delay belongs to another thread.

Word Index links for this example:

interprocess communication

Spanish

Portuguese

German

French

Italian

FreeTranslation.com offers instant, free translations of text or web pages.


	User Contributed Notes:



	There are no notes on this subject.




functions • examples • solutions • updates • about •	links • articles •	login •




	Copyright © 2001-2013 News2News, Inc. Before reproducing or distributing any data from this site please ask for an approval from its owner. Unless otherwise specified, this page is for your personal and non-commercial use. The information on this page is presented AS IS, meaning that you may use it at your own risk. Microsoft Visual FoxPro and Windows are trade marks of Microsoft Corp. All other trademarks are the property of their respective owners. Privacy policy

	Credits: PHP (4.4.9), an HTML-embedded scripting language, MySQL (5.1.55-log), the Open Source standard SQL database, AceHTML Freeware Version 4, freeware HTML Editor of choice. Hosted by Korax Online Inc.

Last Topics Visited (23.20.196.179)
4 sec.	Example: 'Using FrameRgn for displaying system colors'



34.77 min.	Example: 'System Image List Viewer'



34.82 min.	Example: 'Printing Image File, programmatically set print page orientation to landscape'



1.04 hrs.	Example: 'Comparing file times'



	Function: 'GetDC' Function group: 'Device Context'



1.05 hrs.	Example: 'Creating an Open dialog box to specify the drive, directory, and name of a file to open (Shell32 version)'



4.63 hrs.	Example: 'Reading metrics for the currently selected font'



	Example: 'Retrieving a universal form for the drive-based path for a network resource'



5.55 hrs.	Example: 'Simple MAPI: how to pick an email recipient from Outlook Express address book'



	Example: 'Custom HttpRequest class (WinINet)'