Control Flow

• WinCreateWindow
  
• Inform of Window Creation
  
• Request of Instance Creation
  
• Create IM Window
  
• Request of IME loading
  
• Get Current IME
  
• Load IME
  
• Setup Dispatch Address
  
• Request of Mode Change

General Message Flow

The root of the general message is described as blow.

• WM_IMECONTROL
  
• Im Api
  
• ImeNotifyEvent
  
• ImRequestEvent
  
• WM_IMEREQUEST

At WIN95, the application does not receive the WM_IME_NOTIFY (IMN_OPENSTATUSWINDOW) message when the application sends the WM_IME_CONTROL (IMC_OPENSTATUSWINDOW) to the IME window. At new IM, the application receives the WM_IMEREQUEST (IMR_OPENSTATUSWINDOW) message when the application sends the WM_IMECONTROL (IMC_OPENSTATUSWINDOW) to the IM window. Sample of Message Flow

• An Application sends the WM_IMECONTROL (IMC_SETCONVERSIONWINDOWPOS) to IM Window.
  
• IM Window calls ImSetConversionWindowPos which is API of IM.
  
• IM calls ImeNotifyEvent (IME_NE_INSTANCEUPDATED, IME_NE_IU_CONVERSIONPOS).
  
• IME calls ImRequestEvent (IMR_CONVERSION, IMR_CONV_CONVERSIONPOS).
  
• IM generates WM_IMEREQUEST (IMR_CONVERSION, IMR_CONV_CONVERSIONPOS) and sends it to an application window which has focus.
  
• The application window pass WM_IMEREQUEST (IMR_CONVERSION, IMR_CONV_CONVERSIONPOS) to WinDefWindowProc if the application does not handle the message.
  
• WinDefWindowProc sends WM_IMEREQUEST (IMR_CONVERSION, IMR_CONV_CONVERSIONPOS) to IM window.
  
• IM window sends WM_IMEREQUEST (IMR_CONVERSION, IMR_CONV_CONVERSIONPOS) to IME window.
  
• IME window sends WM_IMEREQUEST (IMR_CONVERSION, IMR_CONV_CONVERSIONPOS) to conversion window.

The IME unaware application may pass the IME messages to WinDefWindowProc. The messages are forwarded to the IM window.

The IME aware application can use ImIsIMEMessage to forward the IME messages to IM window. The application can check that the message is handled by IM window.
Result Part Handling

Level 1 Application and Level 2 Application

Level 3 Application

• ImRequestEvent
  
• WM_IMEREQUEST (IMR_??)
  
• WinDefWindowProc
  
• IM Window call IM
  
• WinPourMessage
  
• WinGetMsg

• ImRequestEvent
  
• WM_IMEREQUEST (IMR_??)
  
• ImQueryResultString (Application gets result string for IM instance)