我想在VB.NET下做个控制LED灯的程序，按照网上做法进行DeviceIoControl声明时候却显示错误，请问怎么做？如何声明？希望能给个实例，拜谢啦

你的WinCE系统有加入GPIO驱动没？

这位兄台是想使用.net调用流驱动吧.我也搞了很久了.不知道怎么办.串口是可以用的.有现成控件.其它的东西就不知道了.看了一下framework里有流驱动的调用.不知道是不是,还没有试过

是呀，就是想调用流驱动来控制接的LED，开发板的GPIO应该已经添加过了，上面有EVC的测试程序

我也是在找用VB.NET来控制GPIO的方法，有高手可以指点一二吗？

CHEERS

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace LED_CSharp
{
    public partial class Form1 : Form
    {
        const UInt32 OPEN_EXISTING = 3;
        const UInt32 GENERIC_READ = 0x80000000;
        const UInt32 GENERIC_WRITE = 0x40000000;
        const Int32 INVALID_HANDLE_VALUE = -1;

        const UInt32 LED_ON = 0x01;
        const UInt32 LED_OFF = 0x06;

        
        private IntPtr hPort;

        //导入API
        [DllImport("coredll.dll")]
        public static extern IntPtr CreateFile(String lpFileName, UInt32 dwDesiredAccess, UInt32 dwShareMode, IntPtr lpSecurityAttributes, UInt32 dwCreationDisposition, UInt32 dwFlagsAndAttributes, IntPtr hTemplateFile);
        [DllImport("coredll.dll")]
        public static extern bool DeviceIoControl(IntPtr hDevice, UInt32 dwIoControlCode, Byte[] lpInBuffer, UInt32 nInBufferSize, Byte[] lpOutBuffer, UInt32 nOutBufferSize, UInt32 lpBytesReturned, IntPtr lpOverlapped);


        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //打开LED驱动，获取句柄
            hPort = CreateFile("LED1:", GENERIC_READ | GENERIC_WRITE, 0, IntPtr.Zero, OPEN_EXISTING, 0, IntPtr.Zero);
            if (hPort == (IntPtr)INVALID_HANDLE_VALUE)
            {
                MessageBox.Show("Open Led Driver Fail");
            }
        }

        private void button3_Click(object sender, EventArgs e)
        {
            //打开LED灯
            byte[] led1 = new Byte[1];
            led1[0] = 0;
            byte[] pout = new Byte[10];
            //DeviceIoControl(hPort, LED_ON, led1, 0, pout, 10, 0, IntPtr.Zero);
            DeviceIoControl(hPort, LED_ON, led1, 0, pout,0,0,IntPtr.Zero);
        }  

        private void button4_Click(object sender, EventArgs e)
        {
            //关闭LED灯
            byte[] led1 = new Byte[1];
            led1[0] = 0;
            byte[] pout = new Byte[10];
            //DeviceIoControl(hPort, LED_OFF, led1, 0, pout, 10, 0, IntPtr.Zero);
            DeviceIoControl(hPort, LED_OFF, led1, 0, pout,0,0,IntPtr.Zero);
        }
    }
}

因為是Copy的Code.
事實上
            byte[] led1 = new Byte[1];
            led1[0] = 0;
            byte[] pout = new Byte[10];
led1,pout應該都不需要

tzechienchu,

好诊贵的讯息呀，在此多谢了。

cheers

.#define IO_CTL_LED_1_ON 0x01
#define IO_CTL_LED_2_ON 0x02
#define IO_CTL_LED_3_ON 0x03
#define IO_CTL_LED_4_ON 0x04
#define IO_CTL_LED_ALL_ON 0x05
#define IO_CTL_LED_1_OFF 0x06
#define IO_CTL_LED_2_OFF 0x07
#define IO_CTL_LED_3_OFF 0x08
#define IO_CTL_LED_4_OFF 0x09
#define IO_CTL_LED_ALL_OFF 0x0a
忘了這些空置碼
你可以在 LEDDriver.cpp 中找到

//Key Reading API 宣告
[DllImport ("coredll.dll")]
        public static extern int ReadFile(IntPtr hDevice,Byte[] lpOutBuffer,UInt32 nNumberOfBytesToRead, UInt32 lpBytesReturned, IntPtr lpOverlapped);

//讀Key的值
        byte[] pout = new Byte[6];
         ReadFile(kPort,pout,6,0, IntPtr.Zero);

based on WinCE 6.0 版
另外如何讀取Key Event還在努力中