How to get the file item right-clicked in Finder on OSX - objective-c

Question

I'm writing a plugin via mach_inject to add an item to Finder context menu. I have successfully add it by hooking NSMenu. But now i need to get the item that is right-clicked.
Someone said we could use the following code, but it can only get the selected items instead of right-clicked item (They are different!!!! In Finder, if you select one item and right-clicked another item, the selected one won't change). Anyone knows how to get right-click item in Finder? Thanks!
SBElementArray * selection = [[finder selection] get];
NSArray * items = [selection arrayByApplyingSelector:#selector(URL)];
for (NSString * item in items) {
NSURL * url = [NSURL URLWithString:item];
NSLog(#"selected item url: %#", url);
}

Answer 1

Before get the selected files, you should prepare some help code
struct TFENode {
struct OpaqueNodeRef *fNodeRef;
};
struct TFENodeVector {
struct TFENode *_begin;
struct TFENode *_end;
struct TFENode *_end_cap;
};
- (NSArray *)arrayForNodeVector:(const struct TFENodeVector *)vector
{
NSInteger capacity = vector->_end - vector->_begin;
NSMutableArray *array = [[NSMutableArray alloc] initWithCapacity:capacity];
struct TFENode *node;
for (node = vector->_begin; node < vector->_end; ++node) {
[array addObject: [self pathForNode:node]];
}
return array;
}
You can get files like this
// Snow Leopard & Lion
// gNodeHelper is where you put above code
// override_handleContextMenuCommon: is your override function
+ (void)override_handleContextMenuCommon:(unsigned int)context
nodes:(const struct TFENodeVector *)nodes
event:(id)event
view:(id)view
windowController:(id)windowController
addPlugIns:(BOOL)flag
{
NSArray *paths = [gNodeHelper arrayForNodeVector:nodes];
[self override_handleContextMenuCommon:context
nodes:nodes
event:event
view:view
windowController:windowController
addPlugIns:flag];
}