How to convert "string*128" of VB6 to C# code?

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I have a type-user of VB6 as follows:

VB

Private Type OSVERSIONINFO
    dwOSVersionInfoSize             As Long
    dwMajorVersion                  As Long
    dwMinorVersion                  As Long
    dwBuildNumber                   As Long
    dwPlatformId                    As Long
    szCSDVersion                    As String * 128
End Type

I can't convert all that codes to C# code (i think it is the same a struct in C#) at http://www.developerfusion.com/tools/convert/vb-to-csharp/[^], it reports an error. In that type it contains "szCSDVersion" member which is a string buffer with 128 spaces; please help me convert all to C# code. Thanks.

Posted 18-Oct-12 3:52am

Andrewpeter

Updated 18-Oct-12 3:54am

v2

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2 solutions

Solution 1

Try:

C#

[StructLayout(LayoutKind.Sequential)]
public struct OSVERSIONINFO
{
   private string szcsdversion = string.Empty.PadLeft(128);
   public long dwOSVersionInfoSize;
   public long dwMajorVersion;
   public long dwMinorVersion;
   public long dwBuildNumber;
   public long dwPlatformId;
   public string szCSDVersion
   {
     get {return szcsdversion;}
     set {szcsdversion = value.PadLeft(128);}
   }
}

Posted 18-Oct-12 4:45am

Kuthuparakkal

Updated 18-Oct-12 4:46am

v2

Comments

Andrewpeter 19-Oct-12 4:54am

Thanks you, it works well. My vote is 5.

Kuthuparakkal 21-Oct-12 1:16am

y're welcome!

Akinmade Bond 19-Oct-12 8:27am

+5

Kuthuparakkal 21-Oct-12 1:16am

thank you

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Rey Terativo · Accepted Answer · 2012-10-18T19:04:00

As far as I know the VB6 Long is equivalent to .NET Int32 type, so you should try one of the following:

C#

[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Ansi)]
public struct OSVERSIONINFO
{
    public int dwOSVersionInfoSize;
    public int dwMajorVersion;
    public int dwMinorVersion;
    public int dwBuildNumber;
    public int dwPlatformId;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
    public string szCSDVersion;
}

C#

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct OSVERSIONINFO
{
    public int dwOSVersionInfoSize;
    public int dwMajorVersion;
    public int dwMinorVersion;
    public int dwBuildNumber;
    public int dwPlatformId;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
    public string szCSDVersion;
}

You need to include the System.Runtime.InteropServices namespace.