Re: FILETIME implementation in C# - C# Discussion Boards

29-Oct-15 21:27

I have C++ code which has calls like this

1) SystemTimeToFileTime(&st, &m_Time)

Before above call st is assembled by assigning values to its members manually - but only year, month, day, hour, minutes and seconds are assigned to it.

m_Time is instance variable of type FILETIME.

Afterwards there is a function like that:

2) dppDatetime_t RsDateTime::GetAsPrepaidTime() const
{
    dppDatetime_t dt;// Just a custom structure, this is no problem to create in C#
    SYSTEMTIME st = GetLocalTimeAsSystem();
    dt.Year     = st.wYear;
    dt.Month    = st.wMonth;
    dt.Day      = st.wDay;
    dt.Hour     = st.wHour;
    dt.Minute   = st.wMinute;
    dt.Second   = st.wSecond;
    return dt;
}

GetLocalTimeAsSystem defined as:

3) SYSTEMTIME RsDateTime::GetLocalTimeAsSystem() const
{
    SYSTEMTIME st;

    ::FileTimeToSystemTime(&m_Time, &st);
    return st;
}

I basically need to replicate all this functionality I mentioned in above 1), 2), 3) points in C#. I would really appreciate some help on how to go with this? How to achieve same result in C#?

Can't I implement what is done above using only DateTime structure in C#?

modified 30-Oct-15 4:46am.

John Torjo29-Oct-15 23:02

John Torjo

29-Oct-15 23:02

I really don't understand what you want. C++ has a lot of ugly structures for dealing with time, and in c# you don't have to care - you have the very-easy-to-use DateTime class.

For getting the current time, just use

DateTime.Now
DateTime.UtcNow

Best,
John

-- LogWizard - Log Viewing can be a joy!

Member 1206160030-Oct-15 0:10

30-Oct-15 0:10

I want to achieve steps 1 and 2 as in the question

John Torjo30-Oct-15 0:46

John Torjo

30-Oct-15 0:46

they make no sense in c#

Best,
John

-- LogWizard - Log Viewing can be a joy!

Richard MacCutchan29-Oct-15 23:06

29-Oct-15 23:06

This is essentially the same question as the one below. If you need to use one of the Win32 calls and returned structures then you need to use PInvoke. I gave you the links already.

Member 1206160030-Oct-15 0:09

30-Oct-15 0:09

If you look at my question carefully you can see I think I don't need PInvoke and I can achieve all with DateTime. That is why I asked

Richard MacCutchan30-Oct-15 1:05

VS_FIXEDFILEINFO implementation in C#

30-Oct-15 1:05

Achieve what? Your question is not clear.

Member 1206160028-Oct-15 23:51

28-Oct-15 23:51

I want to achieve in C#, same what this code achieves in C++. Is this possible? How? Preferable would be without using PInvoke

void CVersion::GetVersion(DWORD *v1, DWORD *v2, DWORD *v3, DWORD *Build) const
{
  char Path[1024] ;
  DWORD Len1, Len2 ;
  VS_FIXEDFILEINFO *FileVerInf ;
  if(GetModuleFileName(m_hModule, Path, 1024))
  {
    if((Len1 = GetFileVersionInfoSize(Path, &Len2)) != 0)
    {
      BYTE *InfoBlob = NULL ;
      try
      {
        LPSTR lpstrVffInfo ;
        UINT  uVersionLen  ;
        InfoBlob = new BYTE[Len1+255] ;
        if(!InfoBlob) throw -1 ;
        lpstrVffInfo = (LPSTR)InfoBlob ;
        GetFileVersionInfo(Path, Len2, Len1, lpstrVffInfo) ;

        BOOL bRetCode = VerQueryValue((LPVOID)lpstrVffInfo,
         (LPSTR)"\\",
          (LPVOID *)&FileVerInf,//lpVersion,
          (UINT *)&uVersionLen);

        if(!bRetCode)
        {
          FileVerInf->dwFileVersionLS = 0 ;
          FileVerInf->dwFileVersionMS = 0 ;
        }
        if(v1 != NULL) *v1 = (FileVerInf->dwFileVersionMS&0xffff0000)>>16 ;
        if(v2 != NULL) *v2 = FileVerInf->dwFileVersionMS&0x0000ffff ;
        if(v3 != NULL) *v3 = (FileVerInf->dwFileVersionLS&0xffff0000)>>16 ;
        if(Build != NULL) *Build = FileVerInf->dwFileVersionLS&0x0000ffff ;
      } catch (...) {;}

      if(InfoBlob != NULL) delete[] InfoBlob ;
    }
  }
}

If it is not possible without Pinvoke, can you show me some sample how to do this with PInvoke?

Richard MacCutchan29-Oct-15 0:06

29-Oct-15 0:06

If you do not want to use PInvoke directly you could use a C++ DLL to return the information in a suitable format. See also P/Invoke tutorial[^].

Member 1206160029-Oct-15 1:00

29-Oct-15 1:00

Would you be kind to show me how to achieve similar with PInvoke? I am beginner with .NET

Richard MacCutchan29-Oct-15 1:04

29-Oct-15 1:04

Go to the link I provided and follow the tutorial, although P/Invoke is somewhat advanced for a beginner. You can also find more useful information on The PInvoke website[^].

Member 1206160029-Oct-15 1:08

29-Oct-15 1:08

This is why I am saying it seems a bit advanced for me. This is how I have reached so far with bit of googling, maybe you can help further?

[System.Runtime.InteropServices.DllImport("coredll")]
       private static extern bool GetFileVersionInfo(string filename, UInt32 handle, UInt32 len, IntPtr buffer);

       [System.Runtime.InteropServices.DllImport("coredll")]
       private static extern UInt32 GetFileVersionInfoSize(string filename, out UInt32 handle);

       [System.Runtime.InteropServices.DllImport("coredll")]
       private static extern bool VerQueryValue(IntPtr buffer, string subblock, out IntPtr blockbuffer, out int len);


           UInt32 msb = (UInt32)System.Runtime.InteropServices.Marshal.ReadInt32(verbuffer, 8); // Read the dwFileVersionMS field

           UInt32 lsb = (UInt32)System.Runtime.InteropServices.Marshal.ReadInt32(verbuffer, 12); // Read the dwFileVersionLS field

           major = (msb & 0xFFFF0000) >> 16; // Extract the top 16bits from dwFileVersionMS

           minor = (msb & 0x0000FFFF); // Extract the low 16bits from dwFileVersionMS

           build = (lsb & 0xFFFF0000) >> 16; // Extract the top 16bits from dwFileVersionLS

           revision = (lsb & 0x0000FFFF); // Extract the low 16bits from dwFileVersionLS

But I don't know what is verbuffer?

Richard MacCutchan29-Oct-15 5:16

29-Oct-15 5:16

You need to allocate the version info structure as described on MSDN. You then need to make the calls to the various routines (not just declare them) via the pinvoke calls in order to get the structure filled in with the information.

Member 1206160029-Oct-15 5:19

29-Oct-15 5:19

what about my other approach - see comment below. It showed similar version with one DLL when I tested

Richard MacCutchan29-Oct-15 5:39

29-Oct-15 5:39

user20044 wrote:
what about my other approach

What about it? You need to test your code and check whether it returns the information you want. If it does not get the correct results, then provide the full details so people can try to help.

Member 1206160029-Oct-15 3:05

29-Oct-15 3:05

This is my newer approach. Do you think this is fine?

// Get version, format as string and return it
var versInfo = FileVersionInfo.GetVersionInfo(dllPath);
return String.Format("{0}.{1}.{2}.{3}", versInfo.FileMajorPart, versInfo.FileMinorPart, versInfo.FileBuildPart, versInfo.FilePrivatePart);

OriginalGriff29-Oct-15 0:11

OriginalGriff

29-Oct-15 0:11

Are you trying to get the assembly version?
If so, then it's trivial in C#:

string version = Assembly.GetExecutingAssembly().GetName().Version.ToString();

Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...

Member 1206160029-Oct-15 0:59

29-Oct-15 0:59

My code will run inside DLL, and this needs to get probably(I am not sure) version of DLL

OriginalGriff29-Oct-15 1:18

OriginalGriff

29-Oct-15 1:18

Try it: That's what GetExecutingAssembly does - returns the DLL if the code is in a DLL, and the EXE if it's still in the original app assembly.
There is another methods to get the EXE directly: Assembly.GetEntryAssembly[^]

Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...

Member 1206160029-Oct-15 1:22

29-Oct-15 1:22

You can see my approach in response above to Richard, any comments?

// Get version, format as string and return it
    var versInfo = FileVersionInfo.GetVersionInfo(dllPath);
    return String.Format("{0}.{1}.{2}.{3}", versInfo.FileMajorPart, versInfo.FileMinorPart, versInfo.FileBuildPart, versInfo.FilePrivatePart);

modified 29-Oct-15 9:06am.