Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Custom GDI+ class
How to make a VFP form fading out when released (GDI version)
Obtaining names and positions for shortcuts located on the Windows Desktop
How to put a horizontal text scrolling on the form (a news line, marquee)
Storing content of the Clipboard to a bitmap file
GDI+: copying to the Clipboard (a) image of active FoxPro window/form, (b) image file
GDI+: Implementing image scrolling with inertia
How to copy the image of a form to the Clipboard using Bitmap API functions
Enumerating devices installed on the local machine
Browsing Windows Known Folders (Special Folders)
Creating a clipping region from the path selected into the device context of a form
Placing an arbitrary rectangular area of main VFP window on the Clipboard
How to find which fonts Windows uses for drawing captions, menus and message boxes
Splash Screen for the VFP application
Subclassing CommandButton control to create BackColor property
Vertical Label control
Round FoxPro form
Scanning the hierarchy of child windows down from the main VFP window
Class for sound recording
Reading and setting system access privileges for the current process
Listing child windows for the Windows desktop
Moving shortcut to a specified position on the Windows Desktop
Storing screen shot of a form to bitmap file
Using File Mapping for enumerating files opened by Visual FoxPro
How to retrieve information about a cache entry (Internet Explorer)

User rating: 0/10 (0 votes)
Rate this code sample:
  • ~
More code examples    Listed functions    Add comment     W32 Constants      Translate this page Printer friendly version of this code sample
DO decl

*|typedef struct _INTERNET_CACHE_ENTRY_INFO {
*|    DWORD  dwStructSize;         0:4
*|    LPTSTR  lpszSourceUrlName;   4:4
*|    LPTSTR  lpszLocalFileName;   8:4
*|    DWORD  CacheEntryType;      12:4
*|    DWORD  dwUseCount;          16:4
*|    DWORD  dwHitRate;           20:4
*|    DWORD  dwSizeLow;           24:4
*|    DWORD  dwSizeHigh;          28:4
*|    FILETIME  LastModifiedTime; 32:8
*|    FILETIME  ExpireTime;       40:8
*|    FILETIME  LastAccessTime;   48:8
*|    FILETIME  LastSyncTime;     56:8
*|    LPBYTE  lpHeaderInfo;       64:4
*|    DWORD  dwHeaderInfoSize;    68:4
*|    LPTSTR  lpszFileExtension;  72:4
*|    union {                     76:4
*|        DWORD  dwReserved;
*|        DWORD  dwExemptDelta;
*|    };


LOCAL lcUrl, lcBuffer, lnBufsize, lnResult

* using "Recent Changes" page from FoxForumWiki
lcUrl = ""

*lcBuffer = Chr(cnENTRY_INFO_SIZE) + Repli(Chr(0), cnENTRY_INFO_SIZE-1)
lcBuffer = ""
lnBufsize = 0

= GetUrlCacheEntryInfo(lcUrl, @lcBuffer, @lnBufsize)

lcBuffer = Chr(cnENTRY_INFO_SIZE) + Repli(Chr(0), lnBufsize)
lnResult = GetUrlCacheEntryInfo(lcUrl, @lcBuffer, @lnBufsize)

IF lnResult = 0
*   2 - ERROR_FILE_NOT_FOUND -- file not in cache
    ? "Error code:", GetLastError()

? lcBuffer

LOCAL lnPtr, lcValue
CREATE CURSOR csResult (pname C(50), pvalue C(250))

= addparam ("Required buffer size", LTRIM(STR(lnBufsize)))

lnPtr = buf2dword(SUBSTR(lcBuffer, 5,4))
lcValue = mem2str(lnPtr)
= addparam ("Source Url", lcValue)

lnPtr = buf2dword(SUBSTR(lcBuffer, 9,4))
lcValue = mem2str(lnPtr)
= addparam ("Local file name", lcValue)

lnPtr = buf2dword(SUBSTR(lcBuffer, 13,4))
= addparam ("Cache type bitmask", LTRIM(STR(lnPtr)))

lnPtr = buf2dword(SUBSTR(lcBuffer, 17,4))
= addparam ("User count of the cache entry", LTRIM(STR(lnPtr)))

lnPtr = buf2dword(SUBSTR(lcBuffer, 21,4))
= addparam ("Times the cache entry was retrieved", LTRIM(STR(lnPtr)))

lnPtr = buf2dword(SUBSTR(lcBuffer, 25,4))
= addparam ("Low order of the file size", LTRIM(STR(lnPtr)))

lnPtr = buf2dword(SUBSTR(lcBuffer, 29,4))
= addparam ("High order of the file size", LTRIM(STR(lnPtr)))

lcValue = FTime2ITime(SUBSTR(lcBuffer, 33,8))
= addparam ("Time last modified", lcValue)

lcValue = FTime2ITime(SUBSTR(lcBuffer, 41,8))
= addparam ("Time file expires", lcValue)

lcValue = FTime2ITime(SUBSTR(lcBuffer, 49,8))
= addparam ("Time last access", lcValue)

lcValue = FTime2ITime(SUBSTR(lcBuffer, 57,8))
= addparam ("Time cache synchronized", lcValue)

lnPtr = buf2dword(SUBSTR(lcBuffer, 65,4))
lcValue = mem2str(lnPtr)
= addparam ("Header Info", lcValue)

* end of main

FUNCTION AddParam (lcName, lcValue)
    INSERT INTO csResult VALUES (lcName, lcValue)

FUNCTION  buf2dword (lcBuffer)
RETURN Asc(SUBSTR(lcBuffer, 1,1)) + ;
    BitLShift(Asc(SUBSTR(lcBuffer, 2,1)),  8) +;
    BitLShift(Asc(SUBSTR(lcBuffer, 3,1)), 16) +;
    BitLShift(Asc(SUBSTR(lcBuffer, 4,1)), 24)

FUNCTION  mem2str(lnMemBlock)

    DECLARE RtlMoveMemory IN kernel32 As Heap2Str;

    LOCAL lnPtr, lcResult, lcBuffer, lnPos
    lnPtr = lnMemBlock
    lcResult = ""

    DO WHILE .T.
        lcBuffer = EMPTY_BUFFER
        = Heap2Str (@lcBuffer, lnPtr, BUFFER_SIZE)
        lnPos = AT(Chr(0), lcBuffer)

        IF lnPos > 0
            lcResult = lcResult + SUBSTR(lcBuffer, 1, lnPos-1)
            RETURN  lcResult
            lcResult = lcResult + lcBuffer
            lnPtr = lnPtr + BUFFER_SIZE

FUNCTION FTime2ITime (lcFiletime)

    LOCAL lcSysTime, lcInetTime
    lcSysTime = Repli(Chr(0), cnSYSTIME_SIZE)
    = FileTimeToSystemTime(lcFiletime, @lcSysTime)

    lcInetTime = Repli(Chr(0), INTERNET_RFC1123_BUFSIZE)
    = InternetTimeFromSystemTime(@lcSysTime, INTERNET_RFC1123_FORMAT,;
        @lcInetTime, INTERNET_RFC1123_BUFSIZE)
RETURN STRTRAN(lcInetTime, Chr(0),"")

    DECLARE INTEGER InternetTimeFromSystemTime IN wininet;
        STRING @pst, INTEGER dwRFC, STRING @lpszTime,;
        INTEGER cbTime

    DECLARE INTEGER FileTimeToSystemTime IN kernel32;
        STRING lpFileTime, STRING @lpSystemTime

    DECLARE INTEGER GetLastError IN kernel32

    DECLARE INTEGER GetUrlCacheEntryInfo IN wininet;
        STRING lpszUrlName, STRING @lpCacheEntryInfo,;
        INTEGER @lpdwCacheEntryInfoBufferSize

User rating: 0/10 (0 votes)
Rate this code sample:
  • ~
4699 bytes  
Created: 2002-08-13 14:45:47  
Modified: 2004-09-12 17:16:19  
Visits in 7 days: 60  
Listed functions:
Printer friendly API declarations
My comment:

#kwd: sln_http.
Word Index links for this example:
Translate this page:
  Spanish    Portuguese    German    French    Italian offers instant, free translations of text or web pages.
User Contributed Notes:
There are no notes on this subject.

Copyright 2001-2015 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 (5.5.44), the Open Source standard SQL database, AceHTML Freeware Version 4, freeware HTML Editor of choice.   Hosted by Korax Online Inc.
Last Topics Visited (
23 sec.Function: 'InternetAttemptConnect'
2 min.Function: 'GetClassInfo'
Function group: 'Window Class'
20.46 hrs.Function: 'AttachVirtualDisk'
Advertise here!