Need Help Regarding Setting the value of a variable using Memory Mapped file

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C++

C

Need Help regarding setting the value of a variable dynamically using memory mapped file.
Here i want to get the address of the variable from memory mapped file using varible name and then set the value using that address

EX:

#include <stdio.h>

int aStr;

main(...)
{

    addressofvar (aStr) ;// want to get the address of aStr using memory map file 
    addressof..aStr = value ;//then set the value for aStr using the address

}

Please help

[edit]Sorted the spurious close tag - OriginalGriff[/edit]