error C2065: 'NULL' : undeclared identifier

error C2065: 'NULL' : undeclared identifier

• - Pascal -

  #include <string>

  
  

• PhilJComputerGuy

  Thanks!
  

• Melapower3000

  Don't use NULL in managed code. Use nullptr.

  if(newNode == nullptr)
  {
  . . .
  }

  liusongyun wrote:

  Hi,I have problem to determine whether a point is a NULL point in vc++ 2005, Here is my source code: private: System::Void treeView1_MouseClick(System::Object^ sender, System::Windows::Forms::MouseEventArgs^ e) { Point mouseDownLocation = Point(e->X,e->Y); TreeNode ^newNode = treeView1->GetNodeAt(mouseDownLocation); if(newNode == NULL ) ...... } There is error whith these code,the error message is:error C2065: 'NULL' : undeclared identifier. Am I missing the head file If it is ,which file Thanks for your help.

  
  
  
• error C2065: 'NULL' : undeclared identifier