NSInvocation VS objc_msgSend

NSInvocation VS objc_msgSend

Lets call the method:
- (void)document:(BAPreviewDocument*) doc shouldClose:(BOOL) shouldClose  contextInfo:(void*) contextInfo;

Example of using NSInvocation
  BOOL boolValue = YES;
  NSMethodSignature * methodSig = [[delegate class] instanceMethodSignatureForSelector: shouldCloseSelector];
  NSInvocation * invocation = [NSInvocation invocationWithMethodSignature:methodSig];
  [invocation setTarget: delegate];
  [invocation setSelector: shouldCloseSelector];
  [invocation setArgument: &self atIndex: 2];
  [invocation setArgument: &boolValue atIndex: 3];
  [invocation setArgument: &contextInfo atIndex: 4];
  [invocation invoke];

Example of using objc_msgSend
  #include <objc/message.h>
  void (*callback)(id, SEL, BAPreviewDocument *, BOOL, void *) =  (void (*)(id, SEL, BAPreviewDocument *, BOOL, void *))objc_msgSend;
  (*callback)(delegate, shouldCloseSelector, self, YES, contextInfo);