在C＃中转换zenkaku字符到hankaku，反之亦然 [英] Converting zenkaku characters to hankaku and vice-versa in C#

问题描述

正如它在标题行中所说的那样，我想在C＃中将全角字符转换为hankaku字符和副字符，但不知道如何去做。所以，说ラーメン到ラーメン，反过来说。
这是可以写在一个方法，根据输入的格式自动确定转换需要去的方法？

解决方案

您可以使用字符串.StrConv（）方法通过包含对Microsoft.VisualBasic.dll的引用，或者您可以调用

  private const uint LOCALE_SYSTEM_DEFAULT = 0x0800; 
 private const uint LCMAP_HALFWIDTH = 0x00400000; 
 $ b public static String ToHalfWidth（string fullWidth）
 {
 StringBuilder sb = new StringBuilder（256）; 
 LCMapString（LOCALE_SYSTEM_DEFAULT，LCMAP_HALFWIDTH，fullWidth，-1，sb，sb.Capacity）; 
 return sb.ToString（）; 
} 
 
 [DllImport（kernel32.dll，CharSet = CharSet.Unicode）] 
 private static extern int LCMapString（uint语言环境，uint dwMapFlags，字符串lpSrcStr，int cchSrc ，StringBuilder lpDestStr，int cchDest）; 
  

您也可以做相反的处理：

  private const uint LCMAP_FULLWIDTH = 0x00800000; 
 $ b $ public static String ToFullWidth（string halfWidth）
 {
 StringBuilder sb = new StringBuilder（256）; 
 LCMapString（LOCALE_SYSTEM_DEFAULT，LCMAP_FULLWIDTH，halfWidth，-1，sb，sb.Capacity）; 
 return sb.ToString（）; 
} 
  

至于检测输入字符串的格式，我不知道一个简单的方法，而不先做转换和比较结果。 （如果字符串同时包含全角和半角字符？）

As it says in the header line, I want to convert zenkaku characters to hankaku ones and vice-vrsa in C#, but can't figure out how to do it. So, say "ラーメン" to "ﾗｰﾒﾝ" and the other way around. Would it be possible to write this in a method which determines automatically which way the conversion needs to go, based on the format of the input?

解决方案

You can use the Strings.StrConv() method by including a reference to Microsoft.VisualBasic.dll, or you can p/invoke the LCMapString() native function:

private const uint LOCALE_SYSTEM_DEFAULT = 0x0800;
private const uint LCMAP_HALFWIDTH = 0x00400000;

public static string ToHalfWidth(string fullWidth)
{
    StringBuilder sb = new StringBuilder(256);
    LCMapString(LOCALE_SYSTEM_DEFAULT, LCMAP_HALFWIDTH, fullWidth, -1, sb, sb.Capacity);
    return sb.ToString();
}

[DllImport("kernel32.dll", CharSet = CharSet.Unicode)]
private static extern int LCMapString(uint Locale, uint dwMapFlags, string lpSrcStr, int cchSrc, StringBuilder lpDestStr, int cchDest);

and you can also do the reverse:

private const uint LCMAP_FULLWIDTH = 0x00800000;

public static string ToFullWidth(string halfWidth)
{
    StringBuilder sb = new StringBuilder(256);
    LCMapString(LOCALE_SYSTEM_DEFAULT, LCMAP_FULLWIDTH, halfWidth, -1, sb, sb.Capacity);
    return sb.ToString();
}

As for detecting the format of the input string, I'm not aware of an easy way without doing a conversion first and comparing results. (What if the string contains both full-width and half-width characters?)

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