C# Signature:

[DllImport("Imm32.dll", SetLastError=true)]
public static extern IntPtr ImmGetContext(IntPtr hWnd);

VB Signature:

Declare Function ImmGetContext Lib "Imm32.dll" (TODO) As TODO
Declare Function ImmGetContext Lib "Imm32.dll" (hWnd As Intptr) As Intptr

User-Defined Types:

None.

Notes:

See also ImmGetConversionList function page

VB.NET Signature:

<DllImport("Imm32.dll")>
Friend Shared Function ImmGetContext(hWnd As IntPtr) As IntPtr
End Function

Tips & Tricks:

Please add some!

Notes:

See also ImmGetConversionList function page

Tips & Tricks:

Please add some!

Sample Code:

public class ImeForm : System.Windows.Forms.Form
    {
    //声明一些API函数
    //Declare the related API functions
    [DllImport("imm32.dll")]
    public static extern IntPtr ImmGetContext(IntPtr hwnd);
    [DllImport("imm32.dll")]
    public static extern bool ImmGetOpenStatus(IntPtr himc);
    [DllImport("imm32.dll")]
    public static extern bool ImmSetOpenStatus(IntPtr himc, bool b);
    [DllImport("imm32.dll")]
    public static extern bool ImmGetConversionStatus(IntPtr himc, ref int lpdw, ref int lpdw2);
    [DllImport("imm32.dll")]
    public static extern int ImmSimulateHotKey(IntPtr hwnd, int lngHotkey);
    private const int IME_CMODE_FULLSHAPE = 0x8;
    private const int IME_CHOTKEY_SHAPE_TOGGLE = 0x11;
    //重载Form的OnActivated
    protected override void OnActivated(EventArgs e)
    {
        base.OnActivated(e);
        IntPtr HIme = ImmGetContext(this.Handle);
        if (ImmGetOpenStatus(HIme))  //如果输入法处于打开状态
        if (ImmGetOpenStatus(HIme))  //If the imput method is open
        {
        int iMode = 0;
        int iSentence = 0;
        bool bSuccess = ImmGetConversionStatus(HIme, ref iMode, ref iSentence);  //检索输入法信息
        bool bSuccess = ImmGetConversionStatus(HIme, ref iMode, ref iSentence);  //Scan the input method info
        if (bSuccess)
        {
            if ((iMode & IME_CMODE_FULLSHAPE) > 0)   //如果是全角
            ImmSimulateHotKey(this.Handle, IME_CHOTKEY_SHAPE_TOGGLE);  //转换成半角
            if ((iMode & IME_CMODE_FULLSHAPE) > 0)   //If full shape
            ImmSimulateHotKey(this.Handle, IME_CHOTKEY_SHAPE_TOGGLE);  //Convert tio chotkey shape
        }

        }
    }
    }

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