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
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;
}
}
/// <summary>
/// 打印文字
/// </summary>
private void intoText()//
{
Graphics g = this.CreateGraphics();
g.DrawString(sb.ToString(), font, Brushes.Black, 10, 10);
}
}
}