CopyDataStruct

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I have downloaded some information on CopyDataStruct written by Karl Nilsson but I am unable to work out the commands required:-
This is part of Karl`s code (unfortunately in VB).

Dim cds As COPYDATASTRUCT
cds.dwData = waAddFile
' = 100 (IPC_PLAYFILE)
cds.lpData = lstrcpy(filename, filename)
' Copies filename to itself. Nothing happens,
' but returns the address for the pointer to the string!
cds.cbData = Len(filename) + 1
' Reserve space for filename plus trailing null char

RetVal = CopyDataSendMessage(hWndWinamp, WM_COPYDATA, 0&, cds)

Converting to VFP is causing me a problem.
Does anyone know how to create the `CDS` part of the command line which consists of 3 seperate items of data?

 

[webpager]

Taking this a stage further I need to pass the following info in the CDS part of the function.
1. - 100
2. - Pointer to the string I want to send.
3. - Length of the string I want to send

I assume I use LPARAMETERS to combine the result.

I have values 1 and 3 as numbers but how do I get the pointer value?

 

[jonscott8]

Hi WP,

Unfortunately VFP does not natively support user defined types, or structs. However, since structs are simply contiguous blocks of allocated memory, it is still possible to pass/receive the memory and parse appropriately.

I'd recommend you download Christof Lange's Struct class and read the documentation:

http://www.universalthread.com/wconnect/wc.dll?UniversalThread~?2,54,Forum=5,28,1070

Jon Hawkins

The World Is Headed For Mutiny,
When All We Want Is Unity. - Creed