给.NET的string类添加一个命令行参数分解的扩展

时间：2011-01-12 来源：qiaojie

代码如下：

using System;
using System.Runtime.InteropServices;
using System.Text;

/// <summary>
/// string extension for split command line to string[]
/// </summary>
public static class CmdLineExtension
{
    public static string[] SplitArgs(this string cmd)
    {
        int count;
        var ret = CommandLineToArgvW(cmd, out count);

        if(ret == IntPtr.Zero)
            throw new ArgumentException("Unable to split argument.");
        try
        {
            var results = new string[count];

            for(int i = 0; i < count; i++)
                results[i] = Marshal.PtrToStringUni(Marshal.ReadIntPtr(ret, i * IntPtr.Size));
            return results;
        }
        finally
        {
            LocalFree(ret);
        }
    }

    [DllImport("shell32.dll", SetLastError = true)]
    static extern IntPtr CommandLineToArgvW([MarshalAs(UnmanagedType.LPWStr)]string cmd, out int count);

    [DllImport("kernel32.dll")]
    static extern IntPtr LocalFree(IntPtr mem);
}

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