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 );
}
}
}
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