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.

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;

}

}

/// <summary>

/// 打印文字

/// </summary>

private void intoText()//

{

Graphics g = this.CreateGraphics();

g.DrawString(sb.ToString(), font, Brushes.Black, 10, 10);

}

}

}

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