Question

I take a string like “abcd” as a command line argument in my java code. I need to pass this string to my C JNI code which should take this string and use it as a shared memory identity.
I am looking to know how and where I can make this string to be representing a hexa value.

Answer 1

Java or C? In C, you use strtoul:

#include  <stdlib.h>

int main(int argc, char * argv[])
{
    if (argc > 1)
    {
        unsigned int n = strtoul(argv[1], NULL, 16);
    }
}

Check the manual; when parsing user input it’s vital to check for errors, and there are several aspects to this when using strtoul.