HOWTO: Shutdown an Instance of VFP with a Window Caption

• Microsoft Visual FoxPro for Windows, versions 5.0, 5.0a

SUMMARY

This article provides code that demonstrates how to programmatically close an instance of Visual FoxPro that has the Caption property set to a specific value.

MORE INFORMATION

1. Start one instance of Visual FoxPro.



2. In the Command window, type the following command:

   
         _screen.caption = "Test" 




3. Start a second instance of Visual FoxPro.



4. Create a program named Shutdown that contains the following code:

   
         * Shutdown.prg
         * Example: DO Shutdown with "Test"
         *          Shuts down Exe containing window caption "Test".
         *          Not case sensitive.
   
         PARAMETERS m.text2find
   
   
         DECLARE INTEGER GetWindow IN Win32API INTEGER HWND, ;
         INTEGER wCmd
         DECLARE INTEGER GetWindowText IN Win32API INTEGER HWND, ;
         STRING @lpString, INTEGER aint
         DECLARE INTEGER GetWindowTextLength IN Win32API INTEGER HWND
         DECLARE INTEGER SendMessage IN Win32API INTEGER HWND, ;
         INTEGER Msg, Short WParam, INTEGER LPARAM)
   
         #DEFINE GW_HWNDFIRST  0
         #DEFINE GW_HWNDNEXT 2
         #DEFINE WM_CLOSE 16
   
         SET LIBRARY TO SYS(2004) + "foxtools.fll"
         * Find the window handle for the current instance of Visual FoxPro.
         m.mainhwnd = mainhwnd()
   
         m.currwnd = GetWindow(m.mainhwnd, GW_HWNDFIRST)
   
         DO WHILE m.currwnd # 0
         * Determine how large a buffer to use, adding one space for the
         * terminating Null, and
         * get the window caption for each window on the desktop.
            m.length = GetWindowTextLength(m.currwnd) + 1
            m.windowtext = SPACE(m.length)
            m.length = GetWindowText(m.currwnd, @m.windowtext, m.length)
   
         * Uncomment this line to see the window captions it's checking.
         * A number of the system processes have no window caption associated
         * with them, so there will be a number of blanks.
         * WAIT WINDOW "Checking window " + m.windowtext TIME .5
   
         * The upper() and $ statements would also shutdown windows with the
         * name of Test1, Test2, Mytest, and so forth.
            IF UPPER(m.text2find) $ UPPER(m.windowtext)
         * Uncomment these two lines
         * to see the hWnd of the found window.
         * WAIT WINDOW "Found window we're looking for. hWnd is: " ;
         * + LTRIM(STR(m.currwnd)) TIME .5
         * Send it a message to close.
               =SendMessage (m.currwnd, WM_CLOSE, 0, 0)
               EXIT
            ENDIF
         * Not found, continue with the next window on the desktop.
            m.currwnd = GetWindow(m.currwnd, GW_HWNDNEXT)
         ENDDO 




5. Execute the program with the window caption from step 2 as an argument. For instance:

   
         DO Shutdown with "Test" 




6. The instance of Visual FoxPro started in step 1 terminates.

Additional query words: vfoxwin

Keywords :
Version : WINDOWS:5.0,5.0a
Platform : WINDOWS
Issue type : kbhowto