Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Building a tree of subdirectories for a given path using FindFile functions
Reading and setting the priority class values for the current process and thread
Drawing a window caption using the DrawCaption routine
Using EnumPrinters function to enumerate locally installed printers
Retrieving file information for the VFP executable running
Using IsChild() for testing ThisForm.ShowWindow property
Retrieving the User Datagram Protocol (UDP) listener table
Using Path functions from Shell Lightweight Utility APIs (shlapi.dll)
Placing a button on the VFP form as a new child window
Running a regular FoxPro form while main VFP window is minimized
Obtaining current Internet Explorer browser version and UserAgent
Retrieving the IP-to-physical address mapping table
Winsock: retrieving the standard host name and IP address for the local machine
Drawing cursors for the classes defined by the system (preregistered): BUTTON, EDIT, LISTBOX etc.
Drawing Windows frame controls using the DrawFrameControl function
HOWTO: Use the Win32 API to Access File Dates and Times
Setting properties of the window: caption and user-defined value
Retrieving graphic capabilities of your display
How to view icons stored in executable files (Icon Viewer) - II
Winsock: reading and setting socket options
Converting command-line string to a set of Unicode argument strings
Winsock: retrieving the host information corresponding to a network address
Creating a clipping region from the path selected into the device context of a form
Accessing examples contained in this reference from a VFP application
How to activate Windows Calculator

User rating: 10/10 (2 votes)
Rate this code sample:
  • ~
More code examples    Listed functions    Add comment     W32 Constants      Translate this page Printer friendly version of this code sample
Versions:
click to open
Before you begin:
This code sample explains how to programmatically open an instance of Windows Calculator.

PUBLIC frm
frm = CreateObject("Tform")
frm.Visible = .T.

DEFINE CLASS Tform As Form
#DEFINE WM_QUIT 18
#DEFINE SW_SHOWNORMAL 1
    Width=400
    Height=200
    Caption="Activate Windows Calculator"

    ADD OBJECT cmdShow As CommandButton WITH;
        Caption="Show Calc", Height=24, Width=100,;
        Top=5, Left=10

    ADD OBJECT cmdHide As CommandButton WITH;
        Caption="Hide Calc", Height=24, Width=100,;
        Top=5, Left=112

PROCEDURE Init
    THIS.declare

PROCEDURE Destroy
    THIS._hide

PROCEDURE cmdShow.Click
    ThisForm._show

PROCEDURE cmdHide.Click
    ThisForm._hide

PROCEDURE _show
    LOCAL hWindow
    hWindow = FindWindow(Null, "Calculator")

    IF IsWindow(hWindow)=0
        = WinExec("calc.exe", SW_SHOWNORMAL)
        DOEVENTS
        hWindow = FindWindow(Null, "Calculator")
*        = SetParent(hWindow, _vfp.HWnd)
    ENDIF

    IF IsWindow(hWindow) <> 0
        = SetForegroundWindow(hWindow)  
*        = SetParent(hWindow, _vfp.HWnd)
        THIS.PasteNumber(PI())
    ENDIF

PROCEDURE _hide
    LOCAL hWindow
    hWindow = FindWindow(Null, "Calculator")
    IF IsWindow(hWindow) <> 0
        = PostMessage(hWindow, WM_QUIT, 0,0)
    ENDIF

PROCEDURE PasteNumber(cNumber)
#DEFINE WM_KEYDOWN 0x0100
#DEFINE WM_KEYUP 0x0101
#DEFINE VK_CONTROL 0x11
#DEFINE KEYEVENTF_EXTENDEDKEY 1
#DEFINE KEYEVENTF_KEYUP 2

    LOCAL hWindow
    hWindow = FindWindow(Null, "Calculator")

    IF hWindow <> 0
        * stores the number in the Clipboard
        STORE TRANSFORM(m.cNumber) TO _cliptext

        * makes Calculator the foreground window
        = SetForegroundWindow(hWindow)

        * simulates CTRL+V keystroke
        = keybd_event(VK_CONTROL, 0, 0, 0)
        = keybd_event(VkKeyScan(ASC("V")), 0, 0, 0)
        = keybd_event(VkKeyScan(ASC("V")), 0, KEYEVENTF_KEYUP, 0)
        = keybd_event(VK_CONTROL, 0, KEYEVENTF_KEYUP, 0)
    ENDIF

PROTECTED PROCEDURE declare
    DECLARE INTEGER SetForegroundWindow IN user32;
        INTEGER hWindow

    DECLARE INTEGER IsWindow IN user32 INTEGER hWindow

    DECLARE INTEGER FindWindow IN user32;
        STRING lpClassName, STRING lpWindowName

    DECLARE INTEGER WinExec IN kernel32;
        STRING lpCmdLine, INTEGER nCmdShow

    DECLARE INTEGER PostMessage IN user32;
        INTEGER hWindow, INTEGER Msg,;
        STRING @wParam, INTEGER lParam

    DECLARE keybd_event IN user32;
        SHORT bVk, SHORT bScan, INTEGER dwFlags,;
        INTEGER dwExtraInfo

    DECLARE SHORT VkKeyScan IN user32 INTEGER ch

    DECLARE INTEGER SetParent IN user32;
        INTEGER hWndChild,;
        INTEGER hWndNewParent

ENDDEFINE

User rating: 10/10 (2 votes)
Rate this code sample:
  • ~
2452 bytes  
Created: 2001-07-12 12:00:00  
Modified: 2009-12-28 21:59:15  
Visits in 7 days: 281  
Listed functions:
FindWindow
IsWindow
keybd_event
PostMessage
SetForegroundWindow
SetParent
VkKeyScan
WinExec
Printer friendly API declarations
My comment:
Btw, you can use the SetParent function to make the main VFP window (_screen.hWnd or _vfp.hWnd) the parent window for the Calculator. In that case the calculator window becomes confined in the main VFP window.
Word Index links for this example:
Translate this page:
  Spanish    Portuguese    German    French    Italian  
FreeTranslation.com offers instant, free translations of text or web pages.
User Contributed Notes:
There are no notes on this subject.


Copyright 2001-2014 News2News, Inc. Before reproducing or distributing any data from this site please ask for an approval from its owner. Unless otherwise specified, this page is for your personal and non-commercial use. The information on this page is presented AS IS, meaning that you may use it at your own risk. Microsoft Visual FoxPro and Windows are trade marks of Microsoft Corp. All other trademarks are the property of their respective owners. 

Privacy policy
Credits: PHP (4.4.9), an HTML-embedded scripting language, MySQL (5.1.68), the Open Source standard SQL database, AceHTML Freeware Version 4, freeware HTML Editor of choice.   Hosted by Korax Online Inc.
Last Topics Visited (54.211.153.104)
7 sec.Example: 'Opening access to the Microsoft Internet functions for the application'
7.57 hrs.Example: 'GDI+: sending image of FoxPro form to printer'
7.58 hrs.Example: 'How to enumerate terminal servers within the specified Windows domain'
 Function: 'NetWkstaGetInfo'
Function group: 'Network Management'
 Example: 'How to control Adobe Reader 9.0 (SDI mode) from VFP application'
 Function: 'GetIconInfo'
 
Function group: 'Shell Functions'
 Function: 'GetDlgItem'
Function group: 'Dialog Box'
Google
Advertise here!