C#下实现空白窗体上中文输入
关键字:类PS的文字工具,中文输入.重复截取中文
最近在研究做一个类PS的文字工具,查了N多的资料,问了N多个人,总算功夫不负有人心.终于给弄出来了.写出来给大家一起讨论.(高手们请多多指点)
在空白窗体上打开输入法,在C#里的空白窗口是无论如何也是打不开输入法.设置了this.ImeMode= ImeMode.NoControl也是无法打开输入法的录字窗口.去Microsoft 开发论坛上问了一些问题.感谢周雪峰版主与Riquel_Dong 版主给的指点.用了API函数: ImmAssociateContext(IntPtr hWnd, IntPtr hIMC);终于把输入法给调了出来,它的功能是把输入与指定的窗口进行关联.
代码如下:
f (m.Msg == WM_IME_SETCONTEXT && m.WParam.ToInt32() == 1){ImmAssociateContext(this.Handle, m_hImc);}
现在可以调用输入法了.可是又出现了新的问题.怎么样取得输入法录字窗体上的字呢.
当打开输入法输入文字时,会发送WM_IME_CHAR的消息.我们在这个消息下处理下就可以得到汉字了
可以用IMM的函数: ImmGetCompositionString(IntPtr hIMC, int dwIndex, StringBuilder lpBuf, int dwBufLen);取得录字窗体上输入的汉字或者NUICODE类的字.当然,这里就不研究别的了.只说汉字问题.
取字的代码如下:
case WM_IME_CHAR:int size = ImmGetCompositionString(m_hImc, GCS_COMPSTR, null, 0); size += sizeof(Char); ImmGetCompositionString(m_hImc, GCS_RESULTSTR, str, size); sb.Append(str.ToString()); MessageBox.Show(str.ToString()); intoText();//打印文字 isShowChina = true;break;
OK,.好象是大功告成了.测试了一下才发现打印出来的都是重复的文字.比如输入”为人民服务”,打印出的却是”为为人人民民服服务务”我的天呐,问题出在哪里呢.
去查了一下MSDN.对WM_IME_CHAR有这样的说明:
the WM_IME_CHAR message includes a double-byte character and the application passes this message to DefWindowProc
是不是问题就出在这里了.是发送消息两次的问题.
看了一个网上的讨论,得出一个解决方案:加上判断
if (m.WParam.ToInt32() == PM_REMOVE)
{
}
测试.终于没有了问题了
代码帖子上
using System;using System.Collections.Generic;using System.ComponentModel;using System.Drawing;using System.Data;using System.Text;using System.Windows.Forms;using System.Runtime.InteropServices;
namespace WindowsApplication2{public partial class UserControl1 : UserControl { IntPtr m_hImc;bool isShowChina = false;public const int WM_IME_SETCONTEXT = 0x0281;private const int WM_IME_CHAR = 0x0286;private const int WM_CHAR = 0x0102;private const int WM_IME_COMPOSITION = 0x010F;private const int GCS_COMPSTR = 0x0008;
[DllImport("Imm32.dll")]public static extern IntPtr ImmGetContext(IntPtr hWnd);
[DllImport("Imm32.dll")]public static extern IntPtr ImmAssociateContext(IntPtr hWnd, IntPtr hIMC); [DllImport("imm32.dll")]static extern int ImmGetCompositionString(IntPtr hIMC, int dwIndex, StringBuilder
lpBuf, int dwBufLen);
private int GCS_RESULTSTR = 0x0800;private const int HC_ACTION = 0;private const int PM_REMOVE = 0x0001; StringBuilder sb = new StringBuilder(); Font font = new Font("宋体", 14, FontStyle.Regular);
public UserControl1() { InitializeComponent(); }private void UserControl1_Load(object sender, EventArgs e) { m_hImc = ImmGetContext(this.Handle); }protected override void WndProc(ref Message m) {base.WndProc(ref m);if (m.Msg == WM_IME_SETCONTEXT && m.WParam.ToInt32() == 1) { ImmAssociateContext(this.Handle, m_hImc); }switch (m.Msg) {case WM_CHAR: KeyEventArgs e = new KeyEventArgs(((Keys)((int)((long)m.WParam))) |
ModifierKeys);char a = (char)e.KeyData; //英文 sb.Append(a); intoText(); isShowChina = false;break;case WM_IME_CHAR:if (m.WParam.ToInt32() == PM_REMOVE) //如果不做这个判断.会打印出重复的中文 { StringBuilder str = new StringBuilder();int size = ImmGetCompositionString(m_hImc, GCS_COMPSTR, null, 0); size += sizeof(Char); ImmGetCompositionString(m_hImc, GCS_RESULTSTR, str, size); sb.Append(str.ToString()); MessageBox.Show(str.ToString()); intoText(); isShowChina = true; }break; } }////// 打印文字///private void intoText()// { Graphics g = this.CreateGraphics(); g.DrawString(sb.ToString(), font, Brushes.Black, 10, 10); } }}
