Re: Sharing a structure between processes with memory mapped files
"Sean Farrow" <sean.farrow@seanfarrow.co.uk> wrote in message
news:%23bDxA$8SIHA.2000@TK2MSFTNGP05.phx.gbl
Sorry if thisis th wrong group, but I hope somebody can help:
I am currently working on a project within wich I need to shae a
structure between processes.
The structure is defined in a namespace as follows:
struct SATreeviewInfo {
IAccessible* TreeviewAccessible;
[snipped]
};
You cannot share a structure containing pointers between processes. A
pointer only makes sense within a single process' address space. The
same pointer is meaningless in another process.
Late in the namespace declaration I define a variable of this type:
extern SATreeviewInfo TreeviewInfo;
You want a pointer to SATreeviewInfo instead.
In the main code module after creatin the memory mapped file and
initializing this to th size of the structure, the following code
maps the structure in to the process:
TreeviewInfo =(SATreeviewInfo)MapViewOfFile(HTreeviewMSAAMapFile,
NULL, 0, 0, 0);
Again, you want to cast to SATreeviewInfo*
--
With best wishes,
Igor Tandetnik
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