CDocument::OnOpenDocument

virtual BOOL OnOpenDocument(LPCTSTR lpszPathName);

返回值：如果文档装载成功，则返回非零值，否则为0。

参数：

lpszPathName

指向打开的文档的路径的指针。

说明：
由框架调用该函数，作为File Open命令的一部分。缺省实现方式是打开指定文件，调用DeleteContents来确保文档是空的，调用CObject::Serialize阅读文件内容，然后标明文档未被修改。如果不使用归档机制或文件机制，则覆盖该函数。例如，应用中的文档表示一个数据库的记录而非文件。
如果用户在SDI应用中选择了File Open命令，框架使用该函数对CDocument对象进行重新初始化，而不是创建一个新的文档。如果用户在MDI应用中选择了File Open命令，框架每次建立一个新的CDocument对象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File Open命令的构造程序中，该程序在SDI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 overrides 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::DeleteContents, CDocument::OnCloseDocument, CDocument::OnNewDocument, CDocument::OnSaveDocument, CDocument::ReportSaveLoadException, CObject::Serialize