Using Win32 functions in Visual FoxPro Image Gallery
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Quering waveform-audio output devices
Reading data from INI files
Verifying a file using the Authenticode policy provider

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Before you begin:
The following code sample has been developed by John L Veazey.

The WinVerifyTrust performs a trust verification action on a specified object. The function passes the inquiry to a trust provider that supports the action identifier, if one exists.
? WinVerifyTrust( "C:\Windows\System32\mscomct2.ocx" )

FUNCTION WinVerifyTrust
LPARAMETERS cFileName as String
LOCAL pFileName as String, cFileInfo as String,;
    pFileInfo as Integer, cWintrustInfo as String,;
    nResult as Integer

*!* Ensure the file exists.
IF NOT FILE(cFileName) THEN
    RETURN .F.
ENDIF

*!* Structure Sizes
*!*    GUID = 16 = 4 + 2 + 2 + (1 * 8)
*!* http://msdn.microsoft.com/en-us/library/aa373931%28v=VS.85%29.aspx
*!*    WINTRUST_FILE_INFO = 4 + 4(*) + 4 + 4(*)
*!* http://msdn.microsoft.com/en-us/library/aa388206%28v=VS.85%29.aspx
*!*    WINTRUST_DATA = 48 = 4 + 4 + 4 + 4 + 4 + 4 + 4(*) + 4 + 4 + 4(*) + 4 + 4
*!* http://msdn.microsoft.com/en-us/library/aa388205%28v=VS.85%29.aspx

DECLARE LONG WinVerifyTrust IN wintrust;
AS WinVerifyTrustAPI ;
    LONG, STRING, STRING

*!*    LONG WINAPI WinVerifyTrust(
*!*      __in  HWND hWnd,
*!*      __in  GUID *pgActionID,
*!*      __in  LPVOID pWVTData
*!*    );
*!*

DECLARE RtlMoveMemory IN WIN32API AS CopyMemory ;
    LONG, STRING, LONG

*!*    void CopyMemory(
*!*      __in  PVOID Destination,
*!*      __in  const VOID *Source,
*!*      __in  SIZE_T Length
*!*    );
*!*

DECLARE LONG GlobalAlloc IN WIN32API ;
    LONG, LONG

*!*    HGLOBAL WINAPI GlobalAlloc(
*!*      __in  UINT uFlags,
*!*      __in  SIZE_T dwBytes
*!*    );
*!*

DECLARE LONG GlobalFree IN WIN32API ;
    LONG

*!*    HGLOBAL WINAPI GlobalFree(
*!*      __in  HGLOBAL hMem
*!*    );
*!*

#DEFINE GMEM_ZEROINIT                    0x0040
#DEFINE WTD_UI_NONE                        2
#DEFINE WTD_REVOKE_NONE                    0x00000000
#DEFINE WTD_CHOICE_FILE                    1
#DEFINE WTD_STATEACTION_IGNORE            0x00000000
#DEFINE WTD_SAFER_FLAG                    0x00000100
#DEFINE WTD_UICONTEXT_EXECUTE            0

*!* Allocate UNICODE string
pFileName = GlobalAlloc(GMEM_ZEROINIT, ((LEN(cFileName) + 1) * 2))
*!* Copy filename to UNICODE
cFileName = STRCONV(STRCONV(cFileName,1),5)
*!* Copy UNICODE string to memory allocation
CopyMemory(pFileName, cFileName, LEN(cFileName))
*!* Allocate WINTRUST_FILE_INFO structure
pFileInfo = GlobalAlloc(GMEM_ZEROINIT, 16)
*!* Define contents of WINTRUST_FILE_INFO structure
cFileInfo = BINTOC(16, "4SR") + BINTOC(pFileName, "4SR") +;
    REPLICATE(CHR(0),4) + REPLICATE(CHR(0),4)
*!* Copy Struct data to memory allocation
CopyMemory(pFileInfo, cFileInfo, 16)


*!* {00AAC56B-CD44-11d0-8CC2-00C04FC295EE}
WINTRUST_ACTION_GENERIC_VERIFY_V2  =;
    BINTOC(0x00aac56b, "4SR") +;
    LEFT(BINTOC(0xcd44, "4SR"),2) +;
    LEFT(BINTOC(0x11d0, "4SR"),2) +;
    CHR(0x008c) + CHR(0x00c2) + CHR(0x0000) + CHR(0x00c0) +;
    CHR(0x004f) + CHR(0x00c2) + CHR(0x0095) + CHR(0x00ee)

cWintrustInfo =;
    BINTOC(48, "4SR") +;
    REPLICATE(CHR(0),4) +;
    REPLICATE(CHR(0),4) +;
    BINTOC(WTD_UI_NONE, "4SR") +;
    BINTOC(WTD_REVOKE_NONE, "4SR") +;
    BINTOC(WTD_CHOICE_FILE, "4SR") +;
    BINTOC(pFileInfo, "4SR") +;
    BINTOC(WTD_STATEACTION_IGNORE, "4SR") +;
    REPLICATE(CHR(0),4) +;
    REPLICATE(CHR(0),4) +;
    BINTOC(WTD_SAFER_FLAG, "4SR") +;
    BINTOC(WTD_UICONTEXT_EXECUTE, "4SR")

nResult = WinVerifyTrustAPI(0, WINTRUST_ACTION_GENERIC_VERIFY_V2,;
    cWintrustInfo)

GlobalFree(pFileInfo)
GlobalFree(pFileName)

RETURN nResult == 0
ENDFUNC

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3133 bytes  
Created: 2010-10-07 08:14:17  
Modified: 2010-10-07 08:24:58  
Visits in 7 days: 40  
Listed functions:
CopyMemory
GlobalAlloc
GlobalFree
WinVerifyTrust
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