外部方法使用C#简单例子
1、增加引用using System.Runtime.InteropServices;
2、声明和实现的连接[DllImport("kernel32", SetLastError = true)]
3、声明外部方法public static extern int GetCurrentDirectory(int a, StringBuilder b);
4、对外部方法操作 GetCurrentDirectory(300, pathstring);
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using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Runtime.InteropServices; //引用外部
namespace extern { public partial class DllImportForm : Form
{
public DllImportForm()
{
InitializeComponent();
}
[DllImport( "kernel32" , SetLastError = true )] //声明和实现的连接
public static extern int GetCurrentDirectory( int a, StringBuilder b); //外部方法
private void btnDisplay_Click(object sender, EventArgs e)
{
StringBuilder pathstring= new StringBuilder (); //返回路径
GetCurrentDirectory( 300 , pathstring);
this .listBox1.Items.Add (pathstring );
}
}
} |