public static Encoding[] DetectOutgoingEncodings(string input, int[] preferredEncodings, bool preserveOrder)
{
if (input == null)
{
throw new ArgumentNullException("input");
}
// empty strings can always be encoded as ASCII
if (input.Length == 0)
{
return new Encoding[] { Encoding.ASCII }
}
;
List <Encoding> result = new List <Encoding>();
// get the IMultiLanguage3 interface
MultiLanguage.IMultiLanguage3 multilang3 = new MultiLanguage.CMultiLanguageClass();
if (multilang3 == null)
{
throw new COMException("Failed to get IMultilang3");
}
try
{
int[] resultCodePages = new int[preferredEncodings.Length];
uint detectedCodepages = (uint)resultCodePages.Length;
ushort specialChar = (ushort)'?';
// get unmanaged arrays
IntPtr pPrefEncs = Marshal.AllocCoTaskMem(sizeof(uint) * preferredEncodings.Length);
IntPtr pDetectedEncs = Marshal.AllocCoTaskMem(sizeof(uint) * resultCodePages.Length);
try
{
Marshal.Copy(preferredEncodings, 0, pPrefEncs, preferredEncodings.Length);
Marshal.Copy(resultCodePages, 0, pDetectedEncs, resultCodePages.Length);
MultiLanguage.MLCPF options = MultiLanguage.MLCPF.MLDETECTF_VALID_NLS | MultiLanguage.MLCPF.MLDETECTF_PREFERRED_ONLY;
if (preserveOrder)
{
options |= MultiLanguage.MLCPF.MLDETECTF_PRESERVE_ORDER;
}
options |= MultiLanguage.MLCPF.MLDETECTF_PREFERRED_ONLY;
// finally... call to DetectOutboundCodePage
multilang3.DetectOutboundCodePage(options,
input, (uint)input.Length,
pPrefEncs, (uint)preferredEncodings.Length,
pDetectedEncs, ref detectedCodepages,
ref specialChar);
// get result
if (detectedCodepages > 0)
{
int[] theResult = new int[detectedCodepages];
Marshal.Copy(pDetectedEncs, theResult, 0, theResult.Length);
// get the encodings for the codepages
for (int i = 0; i < detectedCodepages; i++)
{
result.Add(Encoding.GetEncoding(theResult[i]));
}
}
}
finally
{
if (pPrefEncs != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(pPrefEncs);
}
Marshal.FreeCoTaskMem(pDetectedEncs);
}
}
finally
{
Marshal.FinalReleaseComObject(multilang3);
}
// nothing found
return(result.ToArray());
}
private static Encoding DetectOutgoingEncoding(string input, int[] preferredEncodings, bool preserveOrder)
{
if (input == null)
{
throw new ArgumentNullException("input");
}
// empty strings can always be encoded as ASCII
if (input.Length == 0)
{
return(Encoding.ASCII);
}
Encoding result = Encoding.ASCII;
// get the IMultiLanguage3 interface
MultiLanguage.IMultiLanguage3 multilang3 = new MultiLanguage.CMultiLanguageClass();
if (multilang3 == null)
{
throw new COMException("Failed to get IMultilang3");
}
try
{
int[] resultCodePages = new int[preferredEncodings != null ? preferredEncodings.Length : Encoding.GetEncodings().Length];
uint detectedCodepages = (uint)resultCodePages.Length;
ushort specialChar = (ushort)'?';
// get unmanaged arrays
IntPtr pPrefEncs = preferredEncodings == null ? IntPtr.Zero : Marshal.AllocCoTaskMem(sizeof(uint) * preferredEncodings.Length);
IntPtr pDetectedEncs = Marshal.AllocCoTaskMem(sizeof(uint) * resultCodePages.Length);
try
{
if (preferredEncodings != null)
{
Marshal.Copy(preferredEncodings, 0, pPrefEncs, preferredEncodings.Length);
}
Marshal.Copy(resultCodePages, 0, pDetectedEncs, resultCodePages.Length);
MultiLanguage.MLCPF options = MultiLanguage.MLCPF.MLDETECTF_VALID_NLS;
if (preserveOrder)
{
options |= MultiLanguage.MLCPF.MLDETECTF_PRESERVE_ORDER;
}
if (preferredEncodings != null)
{
options |= MultiLanguage.MLCPF.MLDETECTF_PREFERRED_ONLY;
}
multilang3.DetectOutboundCodePage(options,
input, (uint)input.Length,
pPrefEncs, (uint)(preferredEncodings == null ? 0 : preferredEncodings.Length),
pDetectedEncs, ref detectedCodepages,
ref specialChar);
// get result
if (detectedCodepages > 0)
{
int[] theResult = new int[detectedCodepages];
Marshal.Copy(pDetectedEncs, theResult, 0, theResult.Length);
result = Encoding.GetEncoding(theResult[0]);
}
}
finally
{
if (pPrefEncs != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(pPrefEncs);
}
Marshal.FreeCoTaskMem(pDetectedEncs);
}
}
finally
{
Marshal.FinalReleaseComObject(multilang3);
}
return(result);
}
