Using Win32 functions in Visual FoxPro Image Gallery
Message and Message Queue
..msdn
BroadcastSystemMessage
GetQueueStatus
MQCloseQueue
MQDeleteQueue
MQHandleToFormatName
MQOpenQueue
MQPathNameToFormatName
MQPurgeQueue
PeekMessage
PostMessage
PostQuitMessage
SendMessage
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Detecting changes in connections to removable drives (VFP9)
Displaying hypertext links with the SysLink control (VFP9, Comctl32.dll)
Displaying the associated icons and descriptions for files and folders
Enumerating devices installed on the local machine
Extended MessageBox Class
How to change the name and the size of the font in the MessageBox dialog
How to control Adobe Reader 9.0 (SDI mode) from VFP application
How to disable the Windows Clipboard (VFP9)
How to drag a Form not using its Titlebar or Caption
How to draw custom Window Caption on FoxPro form
How to start the screen saver and how to find whether the screen saver is active
How to view icons stored in executable files (Icon Viewer) - II
How to view system icons for the classes installed on the local machine
Moving shortcut to a specified position on the Windows Desktop
Obtaining names and positions for shortcuts located on the Windows Desktop
Round FoxPro form
System Image List Viewer
Using Common Controls: the Header Control
Using Month Calendar Control (VFP9, Comctl32.dll)
Using Video Capture: displaying on FoxPro form frames and previewing video obtained from a digital camera
Using WM_COPYDATA for interprocess communication (VFP9)
Windows Shell Icons displayed and exported to ICO files (Vista)
Using WM_COPYDATA for interprocess communication (VFP9)

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Before you begin:
An application sends the WM_COPYDATA message to pass data to another application running on the same PC.


The screen copy above shows a message sent from VFP to C# application. The MessageBox is invoked by C# form upon receiving the message.

See also:
  • Peer-to-peer LAN messenger built with Mailslot API functions
  • Using mailslots to send messages on the network
  • Using named pipes for interprocess communication
  • Using the NetMessageBufferSend to send messages on the network
  • How to create non-blocking Winsock server
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    6380 bytes  
    Created: 2008-03-28 13:32:01  
    Modified: 2008-04-03 11:52:28  
    Visits in 7 days: 70  
    Listed functions:
    CallWindowProc
    GetWindowLong
    GlobalAlloc
    GlobalFree
    GlobalSize
    SendMessage
    Printer friendly API declarations
    My comment:
    The forms belonging to different VFP sessions (different processes) can exchange data in the same way. The window handle stays global through the Windows session.

    The C# and VFP versions of this code sample are functionally identical. That allows exchanging data between .NET and VFP forms (applications).

    In real life situation, prior to exchanging data the forms must have exchanged their window handles. That can be arranged by each form broadcasting a specific message that the other forms would recognize and respond. The FindWindow API is another option.

    * * *
    Comparing to other ways of interprocess communication (named pipes, mailslots, Winsock) the WM_COPYDATA has a certain edge: no need to implement any listening part. The OS does it for you.

    * * *
    http://blogs.msdn.com/oldnewthing/archive/2003/12/11/56043.aspx
    if you need to pass more than 32767 characters of information to a child process, you`ll have to use something other than the command line.
    * * *
    Articles:
  • Interprocess Communications chapter on MSDN.
  • Foxpro Advisor Exchange Data Between Applications with Visual FoxPro 9 by Christof Wollenhaupt (recommended).
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