CODEWITHSUNDEEP
visual-c++
Inquisitive
Inquisitive

Reputation: 485

How to use shared memory in windows

Consider, I have two Windows stand alone GUI applications. Whenever I press a command button in the first GUI, other GUI should capture the status of the button and should display ON or OFF in the text box in it. How can I do this with the use of shared memory.

PS: I am using VC++ 2008.

Upvotes: 3

Views: 16273

Answers (1)

Leo Chapiro
Leo Chapiro

Reputation: 13984

Take a look: http://msdn.microsoft.com/en-us/library/windows/desktop/aa366551%28v=vs.85%29.aspx

In process 1 :

CreateFileMapping() : It will create the Shared Memory Block, with the name provided in last parameter, if it is not already present and returns back a handle (you may call it a pointer), if successful.

MapViewOfFile() : It maps (includes) this shared block in the process address space and returns a handle (again u can say a pointer).

With this pointer returned by MapViewOfFile() only you can access that shared block.

In process 2 :

OpenFileMapping() : If the shared memory block is successfully created by CreateFileMapping(), you can use it with the same name (name used to create the shared memory block).

UnmapViewOfFile() : It will unmap (you can remove the shared memory block from that process address space). When you are done using the shared memory (i.e. access, modification etc) call this function .

Closehandle() : finally to detach the shared memory block from process , call this with argument,handle returned by OpenFileMapping() or CreateFileMapping().

Upvotes: 6

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