Hi -

The following snippet of code:

class Class1
{

 [DllImport("kernel32")]
 public static extern ulong
GetPrivateProfileString([MarshalAs(UnmanagedType.LPStr)]string app,

[MarshalAs(UnmanagedType.LPStr)]string key,

[MarshalAs(UnmanagedType.LPStr)]string def,

StringBuilder retval,

ulong size,

[MarshalAs(UnmanagedType.LPStr)]string file);
 [DllImport("kernel32")]
       public static extern ulong GetLastError();

 [STAThread]
 static void Main(string[] args)
 {
  string appname = "LOGON";
  string key     = "USER";
  string df      = "Helpless";
   string fn      = @"C:Work\ReadINI\ReadIni\bin\varisol.ini";

  StringBuilder sb = new StringBuilder(20);

  ulong errorcode = 0UL;

  errorcode = GetPrivateProfileString(appname,key,df,sb,21UL,fn);

  errorcode = GetLastError();

 }
}

is intended to read the user name from the logon section of an ini file.
The StringBuilder variable contains the default value of  "Helpless" after
invoking the function - so that it appears the function was at least
invoked.  However, the correct value is never returned and the last error
function indicates that the specified function was not found.  Now, I don't
know if it is even valid to call GetLastError through interop but
GetPrivateProfileString doesn't return an error code - so I have resorted to
this.

Does anybody know what I am doing wrong ?

Thanks for any help

The ini file looks like this:

[LOGON]
USER=Bill