In v16R4 for Windows, the SDI (Single Document Interface) is a new feature that does not require the MDI (Multiple Document Interface) window in the background anymore. The following utility method can determine if the 4D application is in SDI or MDI:

// --------------------------------------------------------------------------- // Name: CHECK_SDI_MODE // Description: Method will determine if the application is in SDI mode for // Windows only. // // Output: // $0 (BOOLEAN) - True - In SDI mode, False - In MDI mode (Default mode) // --------------------------------------------------------------------------- C_LONGINT($left;$top;$right;$bottom) C_BOOLEAN($0) GET WINDOW RECT($left;$top;$right;$bottom;-1) If (($left=0) & ($top=0) & ($right=0) & ($bottom=0))   $0:=True // SDI mode Else   $0:=False // MDI mode End if

Here is an example of MDI mode:

C_TEXT($mode) $mode:= CHECK_SDI_MODE // False

Here is an example of SDI mode:

C_TEXT($mode) $mode:= CHECK_SDI_MODE // True

See Also:

• SDI in Windows (4D Blog)


• SDI mode on Windows