カナ変換

const int GCL_REVERSECONVERSION = 0x0002;



[DllImport("Imm32.dll")]

public static extern IntPtr ImmGetContext(IntPtr hWnd);



[DllImport("User32.dll")]

public static extern IntPtr GetKeyboardLayout(int idThread);



[DllImport("Imm32.dll")]

public static extern int ImmGetConversionList(

    IntPtr hKL,

    IntPtr hIMC,

    string lpSrc,

    IntPtr lpDst,

    int dwBufLen,

    int uFlag              

    );



[DllImport("Imm32.dll")]

public static extern bool ImmReleaseContext(IntPtr hWnd,IntPtr hIMC);



[StructLayout(LayoutKind.Sequential)]

public class CANDIDATELIST 

{

    public int  dwSize;       

    public int  dwStyle;      

    public int  dwCount;      

    public int  dwSelection;  

    public int  dwPageStart;  

    public int  dwPageSize;   

    public int  dwOffset;  

}



public string[] GetReverseConversion(string AText)

{

    IntPtr hIMC = ImmGetContext(this.Handle);

    IntPtr hKL = GetKeyboardLayout(0);

    CANDIDATELIST list = new CANDIDATELIST();

    int dwSize = ImmGetConversionList(hKL,hIMC,AText,IntPtr.Zero,0,GCL_REVERSECONVERSION);

    IntPtr BufList = Marshal.AllocHGlobal(dwSize);

    ImmGetConversionList(hKL,hIMC,AText,BufList,dwSize,GCL_REVERSECONVERSION);

    Marshal.PtrToStructure(BufList,list);

    byte[] buf = new byte[dwSize];

    Marshal.Copy(BufList,buf,0,dwSize);

    Marshal.FreeHGlobal(BufList);

    int os = list.dwOffset;

    string str = System.Text.Encoding.Default.GetString(buf,os,buf.Length-os-3);

    char[] par = "\0".ToCharArray();

    string[] strList = str.Split(par);

    ImmReleaseContext(this.Handle,hIMC);

    return strList;

}



private void button1_Click(object sender, System.EventArgs e)

{

    listBox1.Items.Clear();

    listBox1.Items.AddRange(GetReverseConversion(textBox1.Text));

}