static extern int GetFileVersionInfoSize(string fileName, [Out]IntPtr dummy);

Declare Function GetFileVersionInfoSize Lib "Api-ms-win-core-version-l1-1-0.dll" (fileName As String, <Out> dummy As IntPtr) As Integer

Use this declaration on Windows 10. On previous versions use http://pinvoke.net/default.aspx/version/GetFileVersionInfoSize.html

GetFileVersionInfoSize(@"c:\someFolder\someFile.dll", IntPtr.Zero);

static extern int GetFileVersionInfoSize(string fileName, [Out]IntPtr dummy);

Declare Function GetFileVersionInfoSize Lib "version.dll" (fileName As String, <Out> dummy As IntPtr) As Integer

On Windows 10 use http://pinvoke.net/default.aspx/MinCore/GetFileVersionInfoSize.html

GetFileVersionInfoSize(@"c:\someFolder\someFile.dll", IntPtr.Zero);

        var infoSize = Marshal.SizeOf(BufferRet);

        var handle = Marshal.AllocHGlobal(infoSize);

            handle, infoSize,

        var infoSize = Marshal.SizeOf(BufferRet);

        var handle = Marshal.AllocHGlobal(infoSize);

            handle, infoSize,

        List<SHARE_INFO_1> ShareInfos = new List<SHARE_INFO_1>();

            ShareInfos.Add(shi1);

        return ShareInfos.ToArray();

        ShareInfos.Add(new SHARE_INFO_1("ERROR=" + ret.ToString(),10,string.Empty));

        return ShareInfos.ToArray();

    public uint dwOSVersionInfoSize;

    Public dwOSVersionInfoSize As Integer

    osv.dwOSVersionInfoSize = Marshal.SizeOf(osv)

    osv.dwOSVersionInfoSize = Marshal.SizeOf(osv)

don't forget to set the dwOSVersionInfoSize  

osVersionInfo.dwOSVersionInfoSize = Marshal.SizeOf(osVersionInfo); // don't forget this line, please!

       Public dwOSVersionInfoSize As Integer

    FINDEX_INFO_LEVELS findInfoLevel = FINDEX_INFO_LEVELS.FindExInfoStandard;

    FINDEX_INFO_LEVELS findInfoLevel = FINDEX_INFO_LEVELS.FindExInfoStandard;

    return GetFileAttributesEx(lpFileName, GET_FILEEX_INFO_LEVELS.GetFileExInfoStandard,

if (GetFileAttributesEx(path, GET_FILEEX_INFO_LEVELS.GetFileExInfoStandard, out fileData)){

    return GetFileAttributesEx(lpFileName, GET_FILEEX_INFO_LEVELS.GetFileExInfoStandard,

if (GetFileAttributesEx(path, GET_FILEEX_INFO_LEVELS.GetFileExInfoStandard, out fileData))

If you forget to set the OSVersionInfoSize field of the OSVERSIONINFO struct, the function will return false. GetLastError() will return:

osvi.OSVersionInfoSize = Marshal.SizeOf( osvi );

Console.WriteLine( "Class size:    {0}", osvi.OSVersionInfoSize );

osvi2.OSVersionInfoSize = Marshal.SizeOf(ref typeof(OSVERSIONINFO) );

Console.WriteLine( "Struct size:   {0}", osvi2.OSVersionInfoSize );

If you forget to set the OSVersionInfoSize field of the OSVERSIONINFO struct, the function will return false. GetLastError() will return:

osvi.OSVersionInfoSize = Marshal.SizeOf( osvi );

Console.WriteLine( "Class size:    {0}", osvi.OSVersionInfoSize );

osvi2.OSVersionInfoSize = Marshal.SizeOf(ref typeof(OSVERSIONINFO) );

Console.WriteLine( "Struct size:   {0}", osvi2.OSVersionInfoSize );

    osv.dwOSVersionInfoSize = Marshal.SizeOf(osv)

    osv.dwOSVersionInfoSize = Marshal.SizeOf(osv)

   public uint dwOSVersionInfoSize;

    FindExInfoStandard=0,

enum FOS : uint

    FOS_OVERWRITEPROMPT = 0x00000002,

    FOS_STRICTFILETYPES = 0x00000004,

    FOS_NOCHANGEDIR = 0x00000008,

    FOS_PICKFOLDERS = 0x00000020,

    FOS_FORCEFILESYSTEM = 0x00000040, // Ensure that items returned are filesystem items.

    FOS_ALLNONSTORAGEITEMS = 0x00000080, // Allow choosing items that have no storage.

    FOS_NOVALIDATE = 0x00000100,

    FOS_ALLOWMULTISELECT = 0x00000200,

    FOS_PATHMUSTEXIST = 0x00000800,

    FOS_FILEMUSTEXIST = 0x00001000,

    FOS_CREATEPROMPT = 0x00002000,

    FOS_SHAREAWARE = 0x00004000,

    FOS_NOREADONLYRETURN = 0x00008000,

    FOS_NOTESTFILECREATE = 0x00010000,

    FOS_HIDEMRUPLACES = 0x00020000,

    FOS_HIDEPINNEDPLACES = 0x00040000,

    FOS_NODEREFERENCELINKS = 0x00100000,

    FOS_DONTADDTORECENT = 0x02000000,

    FOS_FORCESHOWHIDDEN = 0x10000000,

    FOS_DEFAULTNOMINIMODE = 0x20000000

Public Enum FOS As UInteger

        GetFileExInfoStandard,

   GetFileExInfoStandard

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    <FieldOffset(68)> Public dwHeaderInfoSize As UInt32

    <FieldOffset(68)> Public dwHeaderInfoSize As UInt32

        SetupDiGetDeviceRegistryProperty(NewDeviceInfoSet, DeviceInfoData, DirectCast(SPDRP_FRIENDLYNAME, Integer), propRegDataType, sbDesc, MAX_LEN, reqSize)

            SetupDiGetDeviceRegistryProperty(NewDeviceInfoSet, DeviceInfoData, DirectCast(SPDRP_DEVICEDESC, Integer), propRegDataType, sbDesc, MAX_LEN, reqSize)

        SetupDiGetDeviceRegistryProperty(NewDeviceInfoSet, DeviceInfoData, DirectCast(SPDRP_HARDWAREID, Integer), propRegDataType, sbHWID, MAX_LEN, reqSize)

        SetupDiGetDeviceInstallParams(NewDeviceInfoSet, DeviceInfoData, deviceInstallParams)

        If Not SetupDiBuildDriverInfoList(NewDeviceInfoSet, DeviceInfoData, SPDIT_COMPATDRIVER) Then

        Dim enumResult As Boolean = SetupDiEnumDriverInfo(NewDeviceInfoSet, DeviceInfoData, SPDIT_COMPATDRIVER, memIndex, drvData)

        SetupDiDestroyDriverInfoList(NewDeviceInfoSet, DeviceInfoData, SPDIT_COMPATDRIVER)

(ByVal DeviceInfoSet As Long, DeviceInterfaceData As Any, _

(ByVal DeviceInfoSet As Long) As Boolean

     IntPtr DeviceInfoSet,

                          ByVal DeviceInfoSet As Integer, _

                          ByVal DeviceInfoSet As IntPtr, _

     IntPtr DeviceInfoSet

    ByVal DeviceInfoSet As Integer) As Boolean

static extern bool SetupDiEnumDeviceInfo(IntPtr DeviceInfoSet, uint MemberIndex, ref SP_DEVINFO_DATA DeviceInfoData);

    ByVal DeviceInfoSet As Integer, _

    ByVal DeviceInfoSet As Integer, _

DeviceInfoSet

    ByVal DeviceInfoSet As IntPtr, _

A call to SetupDiEnumDeviceInterfaces retrieves a pointer to a structure that identifies a specific device interface in the previously retrieved DeviceInfoSet array. The call specifies a device interface by passing an array index. To retrieve information about all of the device interfaces, an application can loop through the array, incrementing the array index until the function returns zero, indicating that there are no more interfaces. The GetLastError API function then returns No more data is available.

   IntPtr DeviceInfoSet,

   IN HDEVINFO  DeviceInfoSet,

    ByVal DeviceInfoSet As IntPtr, _

        IntPtr deviceInfoSet,

        IntPtr deviceInfoSet,

    IntPtr deviceInfoSet,

    IntPtr deviceInfoSet,

deviceInfoSet, Handle to the device information set that contains the interface and its underlying device

    ByVal DeviceInfoSet As Integer, _

    IntPtr hDeviceInfoSet,

Private Function SetupDiOpenDevRegKey(DeviceInfoSet As IntPtr, ByRef DeviceInfoData As SP_DEVINFO_DATA, Scope As UInteger, HwProfile As UInteger, KeyType As UInteger, samDesired As UInteger) As IntPtr

static extern bool SetupDiSetClassInstallParams(IntPtr DeviceInfoSet, ref SP_DEVINFO_DATA DeviceInfoData, IntPtr ClassInstallParams, int ClassInstallParamsSize);

static extern bool SetupDiSetClassInstallParams(IntPtr DeviceInfoSet, ref SP_DEVINFO_DATA DeviceInfoData, IntPtr ClassInstallParams, int ClassInstallParamsSize);

        Console.WriteLine("bound... getting infos");

        // this will be our final array of infos...

        NtdsHelper.DS_DOMAIN_CONTROLLER_INFO_2[] DCinfos;

        IntPtr pDCinfos; // pointer to array of DS_DOMAIN_CONTROLLER_INFO_2

        ret = NtdsHelper.DsGetDomainControllerInfo(hDC, "dom1.ad.sys", 2, out nInfo, out pDCinfos);

            DCinfos = new NtdsHelper.DS_DOMAIN_CONTROLLER_INFO_2[nInfo];

            IntPtr pCurrentInfo = pDCinfos;

                DCinfos[i] = OneInfo;   // copy

                Console.WriteLine(DCinfos[i].NetbiosName);

            NtdsHelper.DsFreeDomainControllerInfo(2, nInfo, pDCinfos);

            Console.WriteLine("error getting domain infos");

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/// <param name="dwEntryInfoSize">Specifies the size, in bytes, of the buffer identified by the lpRasEntry parameter.</param>

/// <param name="dwDeviceInfoSize">This parameter is unused. The calling function should set this parameter to zero.</param>

   int dwEntryInfoSize,

   int dwDeviceInfoSize);

Call RasGetEntryProperties beforehand, passing to it a null RASENTRY to get the correct buffer size (dwEntryInfoSize below).

    uint dwEntryInfoSize = 0;

    uint i = RasGetEntryProperties(null, "", IntPtr.Zero, ref dwEntryInfoSize, IntPtr.Zero, IntPtr.Zero);

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    WTS_PROCESS_INFO[] processInfos = new WTS_PROCESS_INFO[processCount];

        processInfos[i] = (ProcessInfo)Marshal.PtrToStructure(pProcessInfo, typeof(WTS_PROCESS_INFO));

        pProcessInfo = (IntPtr)((int)pProcessInfo + Marshal.SizeOf(processInfos[i]));

    return processInfos;

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static extern bool QueryServiceObjectSecurity(IntPtr serviceHandle, System.Security.AccessControl.SecurityInfos secInfo, ref SECURITY_DESCRIPTOR lpSecDesrBuf, uint bufSize, out uint bufSizeNeeded);

static extern bool QueryServiceObjectSecurity(SafeHandle serviceHandle, System.Security.AccessControl.SecurityInfos secInfo, byte[] lpSecDesrBuf, uint bufSize, out uint bufSizeNeeded);

bool ok = QueryServiceObjectSecurity(sc.ServiceHandle, SecurityInfos.DiscretionaryAcl, psd, 0, out bufSizeNeeded);

    ok = QueryServiceObjectSecurity(sc.ServiceHandle, SecurityInfos.DiscretionaryAcl, psd, bufSizeNeeded, out bufSizeNeeded);

ok = SetServiceObjectSecurity(sc.ServiceHandle, SecurityInfos.DiscretionaryAcl, rawsd);

static extern bool SetServiceObjectSecurity(SafeHandle serviceHandle, System.Security.AccessControl.SecurityInfos secInfos, byte[] lpSecDesrBuf);

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    public int dwFileHashInfoSize;

        // Set the dwFileHashInfoSize to 20 i.e. 5*4

        MSIFILEHASHINFO msifilehashinfo = new MSIFILEHASHINFO { dwFileHashInfoSize = 20 };

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        /// <param name="lcid">Identifies the requested locale for any return szDescription of the enumerated CATEGORYINFOs.</param>

    void SetOptions ( [In] FOS fos );

    void GetOptions ( out FOS pfos );

    void SetOptions ( [In] FOS fos );

    void GetOptions ( out FOS pfos );

                    InfoPathControl.XmlForm.ViewInfos.SwitchView(viewName);

                    if (InfoPathControl.XmlForm.ViewInfos.Count > 0)

                        formTemplateViews = new string[InfoPathControl.XmlForm.ViewInfos.Count];

                        for (int viewCounter = 0; viewCounter < InfoPathControl.XmlForm.ViewInfos.Count; viewCounter++)

                            if (!((ViewInfo)InfoPathControl.XmlForm.ViewInfos[viewCounter]).HideName)

                                viewName = InfoPathControl.XmlForm.ViewInfos[viewCounter].Name;

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     HTTP_SERVICE_CONFIG_URLACL_SET inputConfigInfoSet = new HTTP_SERVICE_CONFIG_URLACL_SET();

     inputConfigInfoSet.KeyDesc = keyDesc;

     inputConfigInfoSet.ParamDesc = paramDesc;

     Marshal.StructureToPtr(inputConfigInfoSet, pInputConfigInfo, false);

         Marshal.SizeOf(inputConfigInfoSet),

         Marshal.SizeOf(inputConfigInfoSet),

             Marshal.SizeOf(inputConfigInfoSet),

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    Dim dwOSVersionInfoSize As Integer

    o.dwOSVersionInfoSize = Len(o)

    o.dwOSVersionInfoSize = Len(o)

    public static extern bool SystemParametersInfoSet(uint action, uint param, uint vparam,     uint init);

    SystemParametersInfoSet(SPI_SETFOREGROUNDLOCKTIMEOUT, 0, 0, 0);

Mó¯W(î#lo´2€9‡dì©©l““CëÑØâ/RëñZÃ¥&êÜ4LICOÞºŒ„»Î2x{FþÎM_{ìRܘf¾=Ã}1/ãþΰôJŠ!3dw,à…ƒ±žT€ Z}6úQ족KT† #ïþÉnüLD‚ÑÚpÔÍÚho–ÍD­!iêvà½@‹‚‚àú¹Õù³²<&‹ÄP1çÞ0s ÛTUŠ<ôÜâ}ä˜/ç¬-Îk‰<ˆ1¼yEýl»d?SÌsêÌ*‡zïÉŠÊقËuÞïä¥9t&WÑǖî>®\œ3{3I8ä6»Bîs*ˆÍ Ÿî됝^p›zõ;w§,Ù»;E¯cóh£<o±kX”eÜÊmÒöè’º»e|g AÊû!\Ê#zœî2›@ùƒQ‹H®Ã3{ù©oòêе͓âüöÐñb5ó,$£¿®¯"¶Ûm˜;©Å10b¬K"(Ô~.5>¿Ígtyhh]Übó–eJ¿FaµÈ2­L¯†”&S›½OHɞ—ºŽáê Ñ"ÿm4ý…’ÕÚì=ú4oÇæ§Ì­/a~&`Œ×_„ÿʐ“9iš ›pۅ¤õ(w"Wۈò±®¶W‘[Îmh¥vÑã«))oð'iTⰖž¸SÛ\6ÈLÛ#ž’gKULÆK>ôDõö½éýJ<.±bÖb1CìÝçü”¦xMEƒÚ£.œFosÒöf#h‚¢$<il ]U}ÃÑ{HФіUYé9ÄIHh42|vàAjM4c¨šò|²S´¹š›
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    public UInt32 dwOSVersionInfoSize;

    Public dwOSVersionInfoSize As UInt32