MFC Dialog Box Message Passing

In MFC, messages can be passed between two dialog boxes using the following methods:

1. Utilize global variables: Define a global variable in one dialog box so that it can be accessed directly in another dialog box to pass messages.
2. Use message mapping: send a custom message in one dialog box, and have another dialog box receive the message by processing it in the message mapping table.
3. By using messaging mechanism, messages can be passed through sending custom messages or WM_COPYDATA messages.
4. Utilize shared memory: Use shared memory to facilitate communication between two dialog boxes.
5. Using Windows message queue: Communication between two dialog boxes can be achieved by sending messages through functions such as PostMessage and SendMessage.