CPaintDC device context question

[nhungr]

In Visual C++, if I create a CPaintDC object in a global function (any function other than the OnPaint message-handler), as follows:

void myfunction(CWnd* pWnd)
{
CPaintDC dc(CWnd* pWnd);

CPen newpen;
CPen* oldpen;
newpen.CreatePen(PS_SOLID,1,RGB(0,0,0));
oldpen=dc.SelectObject(&newpen);
dc.TextOut(100,100,"Some text");
dc.SelectObject(oldpen);
newpen.DeleteObject();

return;
}

and then want to create a new CPaintDC object in a DIFFERENT function, do I have to call the CPaintDC destructor at the end of the first function? If so, then HOW do I call it?

Thanks!

 

[PerFnurt]

>want to create a new CPaintDC object in a DIFFERENT function

Or you could just pass the dc to the functions.

void otherfunc(CDC& dc)
{

}

voif myfunction(...)
{
  CPaintDC dc(pWnd);

  // ...
  otherfunc(dc);
}

>If so, then HOW do I call it?

Question is how do you call a destructor?

void someFunc()
{
  //...
  {
     Foo foo;
     foo.doSomething();
  } // Foo::~Foo is called here
  // ...
}  

or

void someFunc()
{
   Foo* foo = new Foo;
   foo->doSomething();
   delete foo; // Foo::~Foo is called here
}

or

#include <memory>
void someFunc()
{
   std::auto_ptr<Foo> foo( new Foo);
   foo->doSomething();
   foo = std::auto_ptr<Foo>(0);// Foo::~Foo is called here
}

/Per

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