public class ControlTools    {// 声明一些API函数           [DllImport("imm32.dll")]public static extern IntPtr ImmGetContext(IntPtr hwnd);        [DllImport("imm32.dll")]public static extern bool ImmGetOpenStatus(IntPtr himc);

        // 暂时没有用到，觉得这个API似乎有问题。        [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;

private Form mFrm;

public ControlTools(Form frm)        {this.mFrm = frm;        }

        // 输入法全角转半角public void FullToHalf()        {this.mFrm.KeyPreview = true;this.mFrm.Activated += new EventHandler(mFrm_Activated);this.mFrm.KeyUp += new KeyEventHandler(mFrm_KeyUp);        }

private void mFrm_KeyUp(object sender, KeyEventArgs e)        {if ((e.Control || e.Shift) && e.KeyCode == Keys.Space)            {this.mFrm_Activated(null, null);            }        }

private void mFrm_Activated(object sender, EventArgs e)        {try            {                IntPtr HIme = ImmGetContext(this.mFrm.Handle);// 如果输入法处于打开状态                if (!ImmGetOpenStatus(HIme))                {return;                }

int iMode = 0;int iSentence = 0;// 检索输入法信息                   bool bSuccess = ImmGetConversionStatus(HIme, ref   iMode, ref   iSentence);if (bSuccess)                {// 如果是全角,转换成半角                      if ((iMode & IME_CMODE_FULLSHAPE) > 0)                    {                        ImmSimulateHotKey(this.mFrm.Handle, IME_CHOTKEY_SHAPE_TOGGLE);                    }                }            }catch (Exception ex)            {                Console.WriteLine(ex.Message);            }        }    }