Wrote helper functions for objc_getClass() and sel_getUid().

darwintest/runtimetest.go

@@ -16,24 +16,31 @@ import (
 // id objc_msgSend_strarg(id obj, SEL sel, char *a) { return objc_msgSend(obj, sel, a); }
 import "C"
 
+func objc_getClass(class string) C.id {
+	cclass := C.CString(class)
+	defer C.free(unsafe.Pointer(cclass))
+
+	return C.objc_getClass(cclass)
+}
+
+func sel_getUid(sel string) C.SEL {
+	csel := C.CString(sel)
+	defer C.free(unsafe.Pointer(csel))
+
+	return C.sel_getUid(csel)
+}
+
 func main() {
-	_NSString := C.CString("NSString")
-	defer C.free(unsafe.Pointer(_NSString))
-	_stringWithUTF8String := C.CString("stringWithUTF8String:")
-	defer C.free(unsafe.Pointer(_stringWithUTF8String))
-	_UTF8String := C.CString("UTF8String")
-	defer C.free(unsafe.Pointer(_UTF8String))
 	_hello := C.CString("hello, world\n")
 	defer C.free(unsafe.Pointer(_hello))
 
-	NSString := C.objc_getClass(_NSString)
+	NSString := objc_getClass("NSString")
 	stringWithUTF8String :=
-		C.sel_getUid(_stringWithUTF8String)
+		sel_getUid("stringWithUTF8String:")
 	str := C.objc_msgSend_strarg(NSString,
 		stringWithUTF8String,
 		_hello)
-	UTF8String :=
+	UTF8String := sel_getUid("UTF8String")
-		C.sel_getUid(_UTF8String)
 	res := C.objc_msgSend_noargs(str,
 			UTF8String)
 	cres := (*C.char)(unsafe.Pointer(res))