Message Mapping Mechanisms in MFC and Other Applications in Visual C

1
Message Mapping Mechanisms in MFC and Other
Applications in Visual C

• Speaker Yao-Ting Huang
• Advisor Kun-Mao Chao

National Taiwan University Department of Computer
Science Information Engineering Algorithms and
Computational Biology Lab.
2
Message Mapping in Writing MFC

• When using a Windows program, there are many
  types of messages (events) generated.
• e.g., mouse clicked, key pressed, or window
  closed.
• When writing a Windows program, it is essential
  to assign the handling function to each
  corresponding message.
• The message processing is a switch-like
  statement.
• switch(message) case WM_MOUSEMOVE //handle
  mouse movement here. break case
  WM_CLOSE //handle window close here. break

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Message Mapping in Writing MFC

• MFC avoids the detail message processing by
  providing Message Map.
• There are default handling functions assigned to
  common messages.
• You can add your own handling function to
  specific message.
• e.g., BEGIN_MESSAGE_MAP(CTest2App,
  CWinApp) ON_COMMAND(ID_APP_ABOUT,
  OnAppAbout) ON_COMMAND(ID_FILE_NEW,
  CWinAppOnFileNew) ON_COMMAND(ID_FILE_OPEN,
  CWinAppOnFileOpen) ON_COMMAND(ID_FILE_PRINT_SET
  UP, CWinAppOnFilePrintSetup)END_MESSAGE_MAP()

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Message Mapping in Writing MFC

• When you choose to open a file, the
  CWinAppOnFileOpen function will be invoked,
  which will popup a file dialog to the user.
• You can use the class wizard in Visual C to
  manage the message map.
• See an example in Visual C.

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Building Other Applications by Visual C

• You can create other types of applications by
  selecting different projects in Visual C.
• Database project Allow you to write SQL to
  manage a database.
• Internet Server API (ISAPI) Extension Wizard
  Allow you to write Windows socket, email, and
  other Internet applications.
• MFC ActiveX Control Wizard Allow you to write
  ActiveX control which can be embedded into
  dialog, VB program, or WWW pages, to offer
  additional functionalities.

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Remind of Homework 3

• Write a program that prompts the user to input
  the boiling point in degree Celsius.
• The program should output the substance
  corresponding to the boiling point listed in the
  table.
• The program should output the message substance
  unknown when it does not match any substance.
• For the details, please refer to the slide of
  last week.
• The due date is 11/4.

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Outline of Lecture Today

• Manipulate the message map in a MFC application.
• Demo of your Homework 2.
• Please make sure your program is ready to execute.