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An Inter-App Messaging Control v3 - Update 7 Nov 2009

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Submitted on: 11/7/2009 8:41:28 AM
By: Rde 
Level: Intermediate
User Rating: By 8 Users
Compatibility:VB 5.0, VB 6.0

Users have accessed this code 4819 times.
 
author picture
 
     This is a complete and functional control that uses the Copy Data Structure to pass data between applications that utilize this control. It allows you to pass numeric data, strings, dates, currency, in fact all data types (except variants), including arrays and udts, and arrays of udts (except arrays of variants and strings). Update v3 removed the parent hook, and fixed a bug in passing UDTs and now works in both VB5 and VB6. Updated demo thanks to Zhu now shows Unicode strings.

 
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Other User Comments
3/14/2004 5:45:47 PMLight Templer

Hi rde, cool thing! Whats the base technology for the 'Copy Data Structure'? Mutex? Anyway, this special part 'arrays of UDTs seems to me the most useful. Maybe you can add it ;) ?
Regards and *****
LiTe
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3/15/2004 10:02:56 AMRde

Perhaps I should have called it the Copy Data Structure UDT, because that's all it is, a UDT:

Type COPYDATASTRUCT
dwData As Long
cbData As Long
lpData As Long
End Type

This UDT (structure) is part of the Interprocess Communications API:

The Microsoft® Win32® API provides mechanisms for facilitating communications and data sharing between applications. Collectively, the activities enabled by these mechanisms are called Interprocess Communications (IPC).

Used in combination with the WM_COPYDATA window message:

Const WM_COPYDATA = &H4A

Happy coding. Rd.
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3/15/2004 10:08:41 AMRde

believe it or not, adding the ability to handle arrays of udt's should not be too difficult, as they really are just another array of a fixed length data type. I'll see what I can do LiTe. Rd.
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8/19/2004 12:29:50 PMRde

Added the ability to pass arrays of udts - best fix anyway.
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11/5/2009 6:17:35 PMEGL

Have a look at CreateFileMapping, MapViewOfFile, OpenFileMapping API functions. It's called names shared memory. I give you 5 stars because you seem to like to do hard stuff like me. :)D
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11/7/2009 11:46:59 PMRde

Hi EGL

Thanks for the tip, and the generous comment and vote.

Happy coding,
Rd :)
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