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4/14/2010

To override the Back key, you use the SHCMBM_OVERRIDEKEYmessage, the SHMENUBARINFOstructure, and the SHSendBackToFocusWindowfunction.

To override the Back key for dialog boxes with edit controls

  1. To override, during the handling of the Windows Embedded CE WM_INITDIALOGmessage, send the SHCMBM_OVERRIDEKEYmessage to the menu bar specified in the SHMENUBARINFOstructure as follows:

    Copy Code 
    SHMENUBARINFO mbi;
LPARAM lparam = MAKELPARAM(SHMBOF_NODEFAULT | SHMBOF_NOTIFY,
						 SHMBOF_NODEFAULT | SHMBOF_NOTIFY);
lr = SendMessage(mbi.hwndMB, , VK_TBACK, lparam);
// lr now contains the previous value of the key override bits.

  2. To send the Back key to the control with focus, call the SHSendBackToFocusWindowfunction during the handling of the Windows Embedded CE WM_HOTKEYmessage as follows:

    Copy Code 
    case WM_HOTKEY:
{
	if(HIWORD(lParam) == VK_TBACK)
		(uMessage, wParam, lParam);
}

See Also