Question

I am trying to do the following:

NSString *personDesc = [NSString stringWithFormat:@"Person named %@", person.name];
char *myArguments[] = { personDesc, NULL };

But it is producing this error:

warning: Semantic Issue: Incompatible pointer types initializing 'char *' with an expression of type 'NSString *'

The reason I am trying to convert the NSString into a char is because I am passing myArguments into AuthorizationExecuteWithPrivileges

e.g.

AuthorizationExecuteWithPrivileges(auth, tool, kAuthorizationFlagDefaults, myArguments, NULL);

Any ideas?

Answer 1

As matt said above, you need to convert the NSString to a char* before you can do what you want. Try something like:

NSStringEncoding stringEncoding = NSUTF8StringEncoding;
NSString *personDesc = [NSString stringWithFormat:@"Person named %@", person.name];
const char *cPersonDesc = [personDesc cStringUsingEncoding:stringEncoding];
char *myArguments[] = { cPersonDesc, NULL };

// auth and tool already exist
AuthorizationExecuteWithPrivileges(auth, tool, kAuthorizationFlagDefaults, myArguments, NULL);