Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
GDI+: copying to the Clipboard (a) image of active FoxPro window/form, (b) image file
Capturing keyboard activity of another application with the Raw Input API (VFP9)
Using Month Calendar Control (VFP9, Comctl32.dll)
Using Video Capture: displaying on FoxPro form frames and previewing video obtained from a digital camera
Enumerating data formats currently available on the clipboard
Custom GDI+ class
Enumerating raw input devices attached to the system (keyboard, mouse, human interface device)
GDI+: Implementing image scrolling with inertia
Winsock: sending email messages (SMTP, port 25)
Converting Unicode data from the Clipboard to a character string using a given code page
Displaying dimmed window behind VFP top-level form
Copying picture of the active form to the Clipboard using Enhanced Metafile API functions
How to change display settings: screen resolution, screen refresh rate
Winsock: reading email messages (POP3, port 110)
Disconnecting USB Mass Storage Device programmatically
Loading a string resource from an executable file
Creating a clipping region from the path selected into the device context of a form
Displaying hypertext links with the SysLink control (VFP9, Comctl32.dll)
How to put a vertical text scrolling on the form (a movie cast)
HOWTO: Use the Win32 API to Access File Dates and Times
Mapping and disconnecting network drives
Obtaining names and positions for shortcuts located on the Windows Desktop
Current keyboard type
How to load a user profile
How to retrieve information about a cache entry (Internet Explorer)

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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;
*|    };
*|} INTERNET_CACHE_ENTRY_INFO, *LPINTERNET_CACHE_ENTRY_INFO; 80 bytes

#DEFINE cnENTRY_INFO_SIZE  80

LOCAL lcUrl, lcBuffer, lnBufsize, lnResult

* using "Recent Changes" page from FoxForumWiki
lcUrl = "http://fox.wikis.com/wc.dll?Wiki~RecentChanges"

*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
* 122 - ERROR_INSUFFICIENT_BUFFER
    ? "Error code:", GetLastError()
    RETURN
ENDIF

? 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)

GO TOP
BROWSE NORMAL NOWAIT
* end of main

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

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)
#DEFINE BUFFER_SIZE   16
#DEFINE EMPTY_BUFFER  Repli(Chr(0), BUFFER_SIZE)

    DECLARE RtlMoveMemory IN kernel32 As Heap2Str;
        STRING @, INTEGER, INTEGER

    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
        ELSE
            lcResult = lcResult + lcBuffer
            lnPtr = lnPtr + BUFFER_SIZE
        ENDIF
    ENDDO

FUNCTION FTime2ITime (lcFiletime)
#DEFINE cnSYSTIME_SIZE  16
#DEFINE INTERNET_RFC1123_FORMAT   0
#DEFINE INTERNET_RFC1123_BUFSIZE  30

    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),"")

PROCEDURE decl
    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


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4699 bytes  
Created: 2002-08-13 14:45:47  
Modified: 2004-09-12 17:16:19  
Visits in 7 days: 57  
Listed functions:
FileTimeToSystemTime
GetLastError
GetUrlCacheEntryInfo
InternetTimeFromSystemTime
Printer friendly API declarations
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#kwd: sln_http.
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