using objc from c

objc-test.c

/*
 * Compile with:
 *   gcc -g -Wall -pedantic -framework Foundation -framework ScriptingBridge -o objc-test objc-test.c
 */

#include <objc/objc-runtime.h>
#include <stdlib.h>
#include <stdio.h>

void listClasses() {
    int i, num;
    Class *classes;

    num = objc_getClassList(NULL, 0);

    if (num > 0) {
        classes = malloc(sizeof(Class) * num);
        num = objc_getClassList(classes, num);

        for (i = 0; i < num; i++) {
            printf("%d:\t%s\n", i+1, class_getName(classes[i]));
        }

        free(classes);
    }
}

void listMethods(id obj) {
    unsigned i, num;
    Method *methods;

    if ((methods = class_copyMethodList((Class)object_getClass(obj), &num))) {
        for (i = 0; i < num; i++) {
            printf("%d:\t%s\n", i+1, sel_getName(method_getName(methods[i])));
        }

        free(methods);
    }
}

id NSAutoreleasePoolCreate() {
    id NSAutoreleasePool = objc_getClass("NSAutoreleasePool");
    return objc_msgSend(NSAutoreleasePool, sel_registerName("new"));
}

void NSAutoreleasePoolDrain(id pool) {
    objc_msgSend(pool, sel_registerName("drain"));
}

int main() {
    id pool = NSAutoreleasePoolCreate();

    id SBApplication = objc_getClass("SBApplication");
    id NSString = objc_getClass("NSString");

    id myString = objc_msgSend(NSString, sel_registerName("stringWithCString:"), "com.apple.iTunes");
    id myApp = objc_msgSend(SBApplication, sel_registerName("applicationWithBundleIdentifier:"), myString);

    printf("List of methods of iTunesApplication\n\n");
    listMethods(myApp);

    printf("\n\nList of classes\n\n");
    listClasses();

    objc_msgSend(myApp, sel_registerName("playpause"));

    NSAutoreleasePoolDrain(pool);

    return 0;
}