Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Accessing examples contained in this reference through Web Services
Enumerating ODBC drivers available on the local computer
Form Magnifier
How to disable the Windows Clipboard (VFP9)
How to initiate System shutdown
Obtaining heap handles and enumerating memory blocks for the current VFP session (WinNT only)
Opening access to the Microsoft Internet functions for the application
Reading security permissions for NTFS files and folders
Reading VFP settings from the Windows Registry
Retrieveing general information about the driver and data source associated with an ODBC connection
Retrieving Printer Device Context using PrintDlg function
Retrieving the IP-to-physical address mapping table
Retrieving top-child window for the VFP form
Semi-transparent Form
Starting a dialog box for connecting to network resources (mapping network drive)
The original LoadPicture() function in VFP returns valid handles to bitmaps, icons, cursors, and metafiles
Transparent Menu Class (requires VFP9)
Using mailslots to send messages on the network
Using vendor-neutral SQL constructs
Winsock: changing the byte ordering
Winsock: how to retrieve a service information corresponding to a service name
Accessing examples contained in this reference from a VFP application
Clipping mouse cursor area
Displaying printer-properties Property Sheet for the specified printer
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: 180  
Listed functions:
CopyMemory
GlobalAlloc
GlobalFree
WinVerifyTrust
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