C# Signature:
/// <summary>
/// Gets information on a named code page.
/// </summary>
/// <param name="CodePage">The code page number.</param>
/// <param name="dwFlags">Reserved. Must be 0.</param>
/// <param name="lpCPInfoEx">The CPINFOEX struct to initialize.</param>
/// <returns><c>true</c> if the operation completed successfully; <c>false</c> otherwise.</returns>
[DllImport("kernel32.dll", SetLastError = true)]
private static extern bool GetCPInfoEx([MarshalAs(UnmanagedType.U4)] int CodePage, [MarshalAs(UnmanagedType.U4)] int dwFlags, out CPINFOEX lpCPInfoEx);
User-Defined Types:
private const int MAX_DEFAULTCHAR = 2;
private const int MAX_LEADBYTES = 12;
private const int MAX_PATH = 260;
[StructLayout(LayoutKind.Sequential)]
private struct CPINFOEX
{
[MarshalAs(UnmanagedType.U4)]
public int MaxCharSize;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = MAX_DEFAULTCHAR)]
public byte[] DefaultChar;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = MAX_LEADBYTES)]
public byte[] LeadBytes;
public char UnicodeDefaultChar;
[MarshalAs(UnmanagedType.U4)]
public int CodePage;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = MAX_PATH)]
public string CodePageName;
}
Notes:
None.
Tips & Tricks:
Please add some!
Sample Code:
/// <summary>
/// ACT (reference) code pages.
/// </summary>
/// <remarks>
/// A table of ACT code pages can be found here:
/// http://msdn.microsoft.com/en-us/library/aa288104.aspx
/// </remarks>
private enum ActCodePage
{
/// <summary>
/// Default to ANSI code page
/// </summary>
CP_ACP = 0,
/// <summary>
/// Default to OEM code page
/// </summary>
CP_OEMCP = 1,
/// <summary>
/// Mac?
/// </summary>
CP_MACCP = 2,
/// <summary>
/// Current thread's ANSI code page
/// </summary>
CP_THREAD_ACP = 3,
/// <summary>
/// SYMBOL translations
/// </summary>
CP_SYMBO = 42,
/// <summary>
/// Unicode (UTF-7)
/// </summary>
CP_UTF7 = 65000,
/// <summary>
/// Unicode (UTF-8)
/// </summary>
CP_UTF8 = 65001,
}
/// <summary>
/// Gets the .NET Encoding object for a given ACT code page.
/// </summary>
/// <param name="codePage">The code page 'pointer' to look up.</param>
/// <returns>The .NET Encoding for the requested code page.</returns>
private static Encoding GetEncoding(ActCodePage codePage)
{
CPINFOEX info = new CPINFOEX();
if (GetCPInfoEx((int)codePage, 0, out info))
{
Regex findNumber = new Regex(@"^\d+", RegexOptions.Compiled);
Match match = findNumber.Match(info.CodePageName);
if (match.Success)
{
int cp = int.Parse(match.Groups[0].Value);
return Encoding.GetEncoding(cp);
}
else
{
throw new ArgumentException("Unable to find codepage number.");
}
}
else
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
}
Alternative Managed API:
Do you know one? Please contribute it!
