实例介绍
【实例简介】
c#识别二维码(转)
【实例截图】
【核心代码】
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;
using System.Text;
using System.Windows.Forms;
using ZXing;
using ZXing.Common;
using ZXing.QrCode;
namespace QRCodeService
{
public partial class MainForm : Form
{
//摄像头对象
private Capture cam;
//计时器
System.Timers.Timer _timer = null;
//扫描时间频率(毫秒)
private int scanTime = 250;
private bool videoState = false;
private IContainer componentss;
public MainForm()
{
Control.CheckForIllegalCrossThreadCalls = false;
InitializeComponent();
pictureBox1.Visible = false;
btnStop.Enabled = false;
}
//点击开始扫描
private void btnStart_Click(object sender, EventArgs e)
{
Console.WriteLine("摄像头启动");
btnStart.Enabled = false;
btnStop.Enabled = true;
StartCam();
if (_timer != null && _timer.Enabled)
{
_timer.Stop();
_timer.Dispose();
}
//定时器启动，设置扫描频率
_timer = new System.Timers.Timer(scanTime);
_timer.Start();
_timer.Elapsed = new System.Timers.ElapsedEventHandler(_timer_Elapsed);
}
//定时器工作
void _timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
Console.WriteLine("扫描开始");
try
{
//摄像头截屏
string result = SnapShot();
if (string.IsNullOrEmpty(result))
{
if (pictureBox1.Image == null)
{
return;
}
else
{
try
{
result = RQDecode(new Bitmap(pictureBox1.Image));
Console.WriteLine(result);
}
catch (Exception ss)
{ }
if (null != result && !string.IsNullOrEmpty(result))
{
this.textBoxMsg1.Text = result;
CreateQRCode(result);
Console.WriteLine("扫描完毕");
}
else
{
Console.WriteLine("未扫描到二维码。");
this.textBoxMsg1.Text = "未扫描到二维码。";
pictureBox3.Image = null;
}
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
Console.WriteLine("扫描结束");
}
//点击停止扫描
private void btnStop_Click(object sender, EventArgs e)
{
Console.WriteLine("摄像头关闭");
btnStop.Enabled = false;
btnStart.Enabled = true;
textBoxMsg1.Text = string.Empty;
//摄像头停止
StopCam();
//计时器循环扫描停止
_timer.Stop();
_timer.Dispose();
}
//生成二维码，并显示到界面
private void CreateQRCode(string content)
{
EncodingOptions options = null;
BarcodeWriter writer = null;
options = new QrCodeEncodingOptions
{
DisableECI = true,
CharacterSet = "UTF-8",
Width = pictureBox3.Width,
Height = pictureBox3.Height
};
writer = new BarcodeWriter();
writer.Format = BarcodeFormat.QR_CODE;
writer.Options = options;
Bitmap bitmap = writer.Write(content);
pictureBox3.Image = bitmap;
}
//--截图
private string SnapShot()
{
Cursor.Current = Cursors.WaitCursor;
if (m_ip != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(m_ip);
m_ip = IntPtr.Zero;
}
m_ip = cam.Click();
Bitmap b = new Bitmap(cam.Width, cam.Height, cam.Stride, PixelFormat.Format24bppRgb, m_ip);
b.RotateFlip(RotateFlipType.RotateNoneFlipY);
b = ResizeImage(b, pictureBox1);
pictureBox1.Image = b;
Bitmap bit = null;
bit = new Bitmap(pictureBox1.Width, pictureBox1.Height);
Graphics g = Graphics.FromImage(bit);
g.CopyFromScreen(this.PointToScreen(pictureBox1.Location), new Point(0, 0), bit.Size);
g.Dispose();
string result = string.Empty;
try
{
//扫描二维码
result = RQDecode(bit);
Console.WriteLine(result);
}
catch (Exception ex)
{
}
if (!string.IsNullOrEmpty(result))
{
//生成二维码
CreateQRCode(result);
}
Cursor.Current = Cursors.Default;
return result;
}
//--重置图像大小
private Bitmap ResizeImage(Bitmap bmp, PictureBox picBox)
{
float xRate = (float)bmp.Width / picBox.Size.Width;
float yRate = (float)bmp.Height / picBox.Size.Height;
if (xRate <= 1 && yRate <= 1)
{
return bmp;
}
else
{
float tRate = (xRate >= yRate) ? xRate : yRate;
Graphics g = null;
try
{
int newW = (int)(bmp.Width / tRate);
int newH = (int)(bmp.Height / tRate);
Bitmap b = new Bitmap(newW, newH);
g = Graphics.FromImage(b);
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.DrawImage(bmp, new Rectangle(0, 0, newW, newH), new Rectangle(0, 0, bmp.Width, bmp.Height), GraphicsUnit.Pixel);
g.Dispose();
return b;
}
catch
{
return null;
}
finally
{
if (null != g)
{
g.Dispose();
}
}
}
}
//--解码
private string RQDecode(Bitmap img)
{
string errText = string.Empty;
Result result = null;
if (img != null)
{
try
{
result = new BarcodeReader().Decode(img);
}
catch { return errText; }
if (result != null)
{
return result.Text;
}
else
{
return errText;
}
}
else
{
return errText;
}
}
//--开启摄像头
private void StartCam()
{
const int VIDEODEVICE = 0;
const int VIDEOWIDTH = 640;
const int VIDEOHEIGHT = 480;
const int VIDEOBITSPERPIXEL = 32;
cam = new Capture(VIDEODEVICE, VIDEOWIDTH, VIDEOHEIGHT, VIDEOBITSPERPIXEL, pictureBox2);
videoState = true;
}
//--停止摄像头
private void StopCam()
{
cam.Dispose();
if (m_ip != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(m_ip);
m_ip = IntPtr.Zero;
}
videoState = false;
}
private void pictureBox1_Paint(object sender, PaintEventArgs e)
{
PictureBox p = (PictureBox)sender;
Pen pp = new Pen(System.Drawing.Color.Red);
e.Graphics.DrawRectangle(pp, e.ClipRectangle.X, e.ClipRectangle.Y, e.ClipRectangle.X e.ClipRectangle.Width - 1, e.ClipRectangle.Y e.ClipRectangle.Height - 1);
}
private void MainForm_FormClosed(object sender, FormClosedEventArgs e)
{
try
{
StopCam();
}
catch (Exception ex) { }
try
{
Dispose();
}
catch(Exception exx) { }
}
}
}
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