private void ReadCountryList()
{
var lcl = new LINECOUNTRYLIST();
int rc, neededSize = 30 * 1024; // 30K up front
do
{
lcl.dwTotalSize = neededSize;
IntPtr pLcl = Marshal.AllocHGlobal(neededSize);
Marshal.StructureToPtr(lcl, pLcl, true);
rc = NativeMethods.lineGetCountry(0, (int)TapiVersion.V21, pLcl);
Marshal.PtrToStructure(pLcl, lcl);
if (lcl.dwNeededSize > neededSize)
{
neededSize = lcl.dwNeededSize;
rc = NativeMethods.LINEERR_STRUCTURETOOSMALL;
}
else if (rc == NativeMethods.LINEERR_OK)
{
var rawBuffer = new byte[lcl.dwUsedSize];
Marshal.Copy(pLcl, rawBuffer, 0, lcl.dwUsedSize);
for (int i = 0; i < lcl.dwNumCountries; i++)
{
_countries.Add(ReadCountryEntry(lcl, rawBuffer, i));
}
}
Marshal.FreeHGlobal(pLcl);
}while (rc == NativeMethods.LINEERR_STRUCTURETOOSMALL);
}
private static Country ReadCountryEntry(LINECOUNTRYLIST lcl, byte[] rawBuffer, int pos)
{
var lce = new LINECOUNTRYENTRY();
int size = Marshal.SizeOf(lce);
pos = lcl.dwCountryListOffset + (pos * size);
IntPtr pLce = Marshal.AllocHGlobal(size);
Marshal.Copy(rawBuffer, pos, pLce, size);
Marshal.PtrToStructure(pLce, lce);
Marshal.FreeHGlobal(pLce);
return(new Country(lce.dwCountryID, lce.dwCountryCode,
NativeMethods.GetString(rawBuffer, lce.dwCountryNameOffset, lce.dwCountryNameSize, NativeMethods.STRINGFORMAT_UNICODE),
NativeMethods.GetString(rawBuffer, lce.dwSameAreaRuleOffset, lce.dwSameAreaRuleSize, NativeMethods.STRINGFORMAT_UNICODE),
NativeMethods.GetString(rawBuffer, lce.dwLongDistanceRuleOffset, lce.dwLongDistanceRuleSize, NativeMethods.STRINGFORMAT_UNICODE),
NativeMethods.GetString(rawBuffer, lce.dwInternationalRuleOffset, lce.dwInternationalRuleSize, NativeMethods.STRINGFORMAT_UNICODE)));
}