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
GDI+: Storing content of the Clipboard to a bitmap file
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GDI+: saving image of FoxPro form to graphics file (BMP, GIF, JPG, PNG, TIF)
Custom GDI+ class
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Storing content of the Clipboard to a bitmap file
Custom HttpRequest class (WinHTTP)
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Custom HttpRequest class (WinINet)
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Mapping and disconnecting network drives
Enumerating raw input devices attached to the system (keyboard, mouse, human interface device)
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: 39  
Listed functions:
FileTimeToSystemTime
GetLastError
GetUrlCacheEntryInfo
InternetTimeFromSystemTime
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#kwd: sln_http.
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