(VFP) Windows API support class

DEFINE CLASS WinApiSupport AS Custom

* Converts VFP number to the Long integer
FUNCTION Num2Long(tnNum)
LOCAL lcStringl
lcString = SPACE(4)
=RtlPL2PS(@lcString, BITOR(tnNum,0), 4)
RETURN lcString
ENDFUNC

* Convert Long integer into VFP numeric variable
FUNCTION Long2Num(tcLong)
LOCAL lnNum
lnNum = 0
= RtlS2PL(@lnNum, tcLong, 4)
RETURN lnNum
ENDFUNC

* Return Number from a pointer to DWORD
FUNCTION Long2NumFromBuffer(tnPointer)
LOCAL lnNum
lnNum = 0
= RtlP2PL(@lnNum, tnPointer, 4)
RETURN lnNum
ENDFUNC

* Convert Short integer into VFP numeric variable
FUNCTION Short2Num(tcLong)
LOCAL lnNum
lnNum = 0
= RtlS2PL(@lnNum, tcLong, 2)
RETURN lnNum
ENDFUNC

* Retrieve zero-terminated string from a buffer into VFP variable
FUNCTION StrZFromBuffer(tnPointer)
LOCAL lcStr, lnStrPointer
lcStr = SPACE(4096)
lnStrPointer = 0
= RtlP2PL(@lnStrPointer, tnPointer, 4)
lstrcpy(@lcStr, lnStrPointer)
RETURN LEFT(lcStr, AT(CHR(0),lcStr)-1)
ENDFUNC

* Return a string from a pointer to LPWString (Unicode string)
FUNCTION StrZFromBufferW(tnPointer)
Local lcResult, lnStrPointer, lnSen
lnStrPointer = This.Long2NumFromBuffer(tnPointer)

lnSen = lstrlenW(lnStrPointer) * 2
lcResult = Replicate(chr(0), lnSen)
= RtlP2PS(@lcResult, lnStrPointer, lnSen)
lcResult = StrConv(StrConv(lcResult, 6), 2)

RETURN lcResult
ENDFUNC

* Retrieve zero-terminated string
FUNCTION StrZCopy(tnPointer)
LOCAL lcStr, lnStrPointer
lcStr = SPACE(4096)
lstrcpy(@lcStr, tnPointer)
RETURN LEFT(lcStr, AT(CHR(0),lcStr)-1)
ENDFUNC

ENDDEFINE
*------------------------------------------------------------------------
FUNCTION RtlPL2PS(tcDest, tnSrc, tnLen)
DECLARE RtlMoveMemory IN WIN32API AS RtlPL2PS STRING @Dest, Long @Source, Long Length
RETURN RtlPL2PS(@tcDest, tnSrc, tnLen)

FUNCTION RtlS2PL(tnDest, tcSrc, tnLen)
DECLARE RtlMoveMemory IN WIN32API AS RtlS2PL Long @Dest, String Source, Long Length
RETURN RtlS2PL(@tnDest, @tcSrc, tnLen)

FUNCTION RtlP2PL(tnDest, tnSrc, tnLen)
DECLARE RtlMoveMemory IN WIN32API AS RtlP2PL Long @Dest, Long Source, Long Length
RETURN RtlP2PL(@tnDest, tnSrc, tnLen)

FUNCTION RtlP2PS(tcDest, tnSrc, tnLen)
DECLARE RtlMoveMemory IN WIN32API AS RtlP2PS STRING @Dest, Long Source, Long Length
RETURN RtlP2PS(@tcDest, tnSrc, tnLen)

FUNCTION lstrcpy (tcDest, tnSrc)
DECLARE lstrcpy IN WIN32API STRING @lpstring1, INTEGER lpstring2
RETURN lstrcpy (@tcDest, tnSrc)

FUNCTION lstrlenW(tnSrc)
DECLARE Long lstrlenW IN WIN32API Long src
RETURN lstrlenW(tnSrc)