CDocument::OnNewDocument

virtual BOOL OnNewDocument();

返回值：如果文档初始化成功，则返回非零值，否则为0。

说明：
由框架调用，作为File New命令的一部分。缺省实现方式是调用该函数确保文档为空，并标明新文档是未被修改的。覆盖该函数进行新文档数据结构的初始化，应从函数覆盖中调用该函数的基类版本。
如果用户在SDI应用中选择了File New命令，框架使用该函数对存在的文档进行重新初始化，而不是创建一个新的文档。如果用户在MDI应用中选择了File New命令，框架每次建立一个新的文档并调用该函数来进行初始化。必须将初始化代码放在这个函数中而不是放在FileNew命令的构造程序中，该程序在SDI应用中有效。

示例：
// The following examples illustrate alternative methods of
// initializing a document object.
// Method 1: In an MDI application,the simplest place to do
// initialization is in the document constructor.The framework
// always creates a new document object for File New or File Open.
CMyDoc::CMyDoc()
{
  // Do initialization of MDI document here.
  // ...
}

// Method 2: In an SDI or MDI application,do all initialization
// in an override of OnNewDocument,if you are certain that
// the initialization is effectively saved upon File Save
// and fully restored upon File Open,via serialization.
BOOL CMyDoc::OnNewDocument()
{
  if (!CDocument::OnNewDocument()) return FALSE;
  // Do initialization of new document here.
  return TRUE;
}

// Method 3: If the initialization of your document is not
// effectively saved and restored by serialization(during File Save
// and File Open),the implement the initialization in single
// function(named InitMyDocument in this example).Call the
// shared initialization function from override of both
// OnNewDocument and OnOpenDocument.
BOOL CMyDoc::OnNewDocument()
{
  if (!CDocument::OnNewDocument()) return FALSE;
  InitMyDocument(); //call your shared initialization function
  // If your new document object requires additional initialization
  // not necessary when the document is deserialized via File Open,
  // then perform that additional initialization here.
  return TRUE;
}

请参阅：
CDocument::CDocument, CDocument::DeleteContents, CDocument::OnCloseDocument, CDocument::OnOpenDocument, CDocument::OnSaveDocument