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CException::ReportError 

Call this member function to report error text in a message box to the user.


virtual int ReportError(
   UINT nType = MB_OK,
   UINT nMessageID = 0 
);

Parameters

nType

Specifies the style of the message box. Apply any combination of the message-box styles to the box. If you don't specify this parameter, the default is MB_OK.

nMessageID

Specifies the resource ID (string table entry) of a message to display if the exception object does not have an error message. If 0, the message "No error message is available" is displayed.

An AfxMessageBox value; otherwise 0 if there is not enough memory to display the message box. See AfxMessageBox for the possible return values.

Here is an example of the use of CException::ReportError. For another example, see the example for CATCH.

   CFile fileInput;
   CFileException ex;

   // try to open a file for reading.  
   // The file will certainly not
   // exist because there are too many explicit
   // directories in the name.

   // if the call to Open() fails, ex will be
   // initialized with exception
   // information.  the call to ex.ReportError() will
   // display an appropriate
   // error message to the user, such as
   // "\Too\Many\Bad\Dirs.DAT contains an
   // invalid path."  The error message text will be
   // appropriate for the
   // file name and error condition.

   if (!fileInput.Open("\\Too\\Many\\Bad\\Dirs.DAT", CFile::modeRead, &ex))
   {
      ex.ReportError();
   }
   else
   {
      // the file was opened, so do whatever work
      // with fileInput we were planning...
      // :

      fileInput.Close();
   }
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