c#设置“按钮”提示使用默认打印机，将设置保存到ini文件

using System;
using System.Runtime.InteropServices;

public class PrinterHelper
{
    // Windows API函数声明
    [DllImport("winspool.drv", CharSet = CharSet.Auto, SetLastError = true)]
    public static extern bool SetDefaultPrinter(string printerName);

    [DllImport("winspool.drv", CharSet = CharSet.Auto, SetLastError = true)]
    public static extern bool GetDefaultPrinter(StringBuilder printerName, ref int size);

    // INI文件操作函数声明
    [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
    private static extern int GetPrivateProfileString(string section, string key, string defaultValue, StringBuilder value, int size, string filePath);

    [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
    private static extern bool WritePrivateProfileString(string section, string key, string value, string filePath);

    // 获取默认打印机名称
    public static string GetDefaultPrinter()
    {
        const int bufferSize = 256;
        StringBuilder printerName = new StringBuilder(bufferSize);
        int size = bufferSize;
        GetDefaultPrinter(printerName, ref size);
        return printerName.ToString();
    }

    // 设置默认打印机
    public static bool SetDefaultPrinter(string printerName)
    {
        return SetDefaultPrinter(printerName);
    }

    // 将默认打印机设置保存到INI文件
    public static void SavePrinterSettingToIni(string printerName)
    {
        WritePrivateProfileString("PrinterSettings", "DefaultPrinter", printerName, "settings.ini");
    }

    // 从INI文件中加载默认打印机设置
    public static string LoadPrinterSettingFromIni()
    {
        const int bufferSize = 256;
        StringBuilder printerName = new StringBuilder(bufferSize);
        GetPrivateProfileString("PrinterSettings", "DefaultPrinter", "", printerName, bufferSize, "settings.ini");
        return printerName.ToString();
    }
}

// 在按钮的Click事件中调用以下代码
private void button_Click(object sender, EventArgs e)
{
    string defaultPrinter = PrinterHelper.GetDefaultPrinter();
    PrinterHelper.SetDefaultPrinter(defaultPrinter);
    PrinterHelper.SavePrinterSettingToIni(defaultPrinter);
}