C#与USB设备通信 kernel32.dll

using System;

using System.Collections.Generic;

using System.Text;

using System.Runtime.InteropServices;

namespace WindowsApplication1

{

class Class1

{

[DllImport("kernel32.dll")]

private static extern IntPtr CreateFile(

String lpFileName,

UInt32 dwDesiredAccess,

UInt32 dwShareMode,

IntPtr lpSecurityAttributes,

UInt32 dwCreationDisposition,

UInt32 dwFlagsAndAttributes,

IntPtr hTemplateFile

);

[DllImport("Kernel32.dll")]

private static extern bool ReadFile(

IntPtr hFile,

byte[] lpBuffer,

uint nNumberOfBytesToRead,

ref uint lpNumberOfBytesRead,

IntPtr lpOverlapped

);

[DllImport("Kernel32.dll")]

private static extern bool WriteFile(

IntPtr hFile,

byte[] lpBuffer,

uint nNumberOfBytesToWrite,

ref uint lpNumberOfBytesWritten,

IntPtr lpOverlapped

);

[DllImport("kernel32.dll")]

private static extern bool CloseHandle(

IntPtr hObject

);

//--------------------------------------------------------------------------------

IntPtr hFile;

private const UInt32 GENERIC_READ = 0x80000000;

private const UInt32 GENERIC_WRITE = 0x40000000;

private const UInt32 OPEN_EXISTING = 3;

private const Int32 INVALID_HANDLE_VALUE = -1;

private const int USB_WRITENUM = 8;

private const int USB_READNUM = 8;

private byte[] m_rd_data = new byte[USB_READNUM];

public byte[] rd_data

{

get { return m_rd_data; }

set { m_rd_data = value; }

}

private byte[] m_wr_data = new byte[USB_WRITENUM];

public byte[] wr_data

{

get { return m_wr_data; }

set { m_wr_data = value; }

}

public bool OnInitUSB()

{

hFile = IntPtr.Zero;

string deviceName = string.Empty;

deviceName = "在这里写上你的设备的地址";

hFile = CreateFile(

deviceName,

GENERIC_READ | GENERIC_WRITE,

0,

IntPtr.Zero,

OPEN_EXISTING,

0,

IntPtr.Zero

);

return hFile.ToInt32() == INVALID_HANDLE_VALUE ? false : true;

}

public bool USBDataRead()

{

uint read = 0;

return ReadFile(hFile, m_rd_data, (uint)USB_READNUM, ref read, IntPtr.Zero);

}

public bool USBDataWrite()

{

uint written = 0;

return WriteFile(hFile, m_wr_data, (uint)USB_WRITENUM, ref written, IntPtr.Zero);

}

public void CloseConnection()

{

if (hFile.ToInt32() != INVALID_HANDLE_VALUE)

{

CloseHandle(hFile);

hFile = IntPtr.Zero;

}

}

}

}