本文使用dispatcherTimer计时器，指定间隔时间，完成一次相机图片实时采集。在halcon18和WPF .Net Framwork4.7.2实测有效。
首先完成halcon在wpf中的配置halcon联合c#、WPF学习笔记一(WPF配置halcon)
加入命名空间using HalconDotNet;
一、在halcon中编写相机采集的程序
* Image Acquisition 02: Code generated by Image Acquisition 02
*获取相机
open_framegrabber ('DirectShow', 1, 1, 0, 0, 0, 0, 'default', 8, 'rgb', -1, 'false', 'default', '[0] ', 0, -1, AcqHandle)
*设置相机参数
set_framegrabber_param (AcqHandle, 'grab_timeout', 2000)
*启动相机
grab_image_start (AcqHandle, -1)
while (true)
*从相机中获取图片
grab_image_async (Image, AcqHandle, -1)
*获得图片的宽高
get_image_size (Image, Width, Height)
*设置窗口显示区域（整张图）
dev_set_part (0, 0, Height, Width)
*展示图片
dev_display (Image)
* Image Acquisition 02: Do something
endwhile
*关闭相机
close_framegrabber (AcqHandle)
然后导出成c#
二、WPF界面
在主窗口中，放一个HWindowControlWPF和三个Button
并将HWindowControlWPF 的Name取为Name=“halconVideo”， 后续需要和窗体绑定
三、打开相机
先在类中定义一些变量
DispatcherTimer dispatcherTimer = null;
HObject ho_Image = null;//从相机中采集的图
HTuple hv_AcqHandle = null;//相机句柄
HTuple hv_WindowHandle = new HTuple();//窗口句柄
HTuple hv_Width = new HTuple();//图片的宽
HTuple hv_Height = new HTuple();//图片的高
点击按钮 打开相机，将执行以下部分。
这部分直接从生成的c#代码中拷贝即可。
//打开相机
private void Button_Click(object sender, RoutedEventArgs e)
{
HOperatorSet.GenEmptyObj(out ho_Image);
hv_AcqHandle = new HTuple();
//Image Acquisition 01: Code generated by Image Acquisition 01
hv_AcqHandle.Dispose();
HOperatorSet.OpenFramegrabber("DirectShow", 1, 1, 0, 0, 0, 0, "default", 8, "rgb",
-1, "false", "default", "[0] ", 0, -1, out hv_AcqHandle);
HOperatorSet.SetFramegrabberParam(hv_AcqHandle, "grab_timeout", 2000);//设置相机参数
HOperatorSet.GrabImageStart(hv_AcqHandle, -1);//打开相机句柄
}
四、采集显示
单击按钮 采集显示 将会执行以下内容
1.打开定时器(每间隔一段时间就执行事件(从相机中采集图片))
2.打开窗口
使用dispatcherTimer前记得加入命名空间using System.Windows.Threading;
private void Button_Click_1(object sender, RoutedEventArgs e)
{
//启动定时器
dispatcherTimer = new DispatcherTimer();
dispatcherTimer.Tick += new EventHandler(dispatcherTimer_Tick);//添加事件(到达时间间隔后会自动调用)
dispatcherTimer.Interval = new TimeSpan(0, 0, 1);//设置时间间隔为1秒
dispatcherTimer.Start();//启动定时器
//打开窗口（关联控件）
HOperatorSet.OpenWindow(0, 0, halconVideo.Width, halconVideo.Height, halconVideo.HalconWindow, "visible", "", out hv_WindowHandle);
HDevWindowStack.Push(hv_WindowHandle);
}
定义事件(采集图片)
直接从导出的c#中拷贝
//计时器时间(从相机中采图并显示)
private void dispatcherTimer_Tick(object sender, EventArgs e)//计时执行的程序
{
ho_Image.Dispose();
HOperatorSet.GrabImageAsync(out ho_Image, hv_AcqHandle, -1);//获取图片
HOperatorSet.GetImageSize(ho_Image, out hv_Width, out hv_Height);//获取图片的宽和高
if (HDevWindowStack.IsOpen())
{
HOperatorSet.SetPart(HDevWindowStack.GetActive(), 0, 0, hv_Height, hv_Width);//设置显示的范围
HOperatorSet.DispObj(ho_Image, HDevWindowStack.GetActive());//显示图片
}
}
注意这两个句柄的区别：
hv_WindowHandle 窗口句柄 （绑定HWindowControlWPF控件,并放入HDevWindowStack堆栈中）
hv_AcqHandle 相机 （从相机采图）
最后将采集来的图，通过HDevWindowStack的栈顶的窗体(hv_WindowHandle)，显示从相机采集来的图
五、关闭相机
直接从导出的C#代码拷贝
private void Button_Click_2(object sender, RoutedEventArgs e)
{
HOperatorSet.CloseFramegrabber(hv_AcqHandle);
ho_Image.Dispose();
}
六、完整代码
MainWindow.xaml
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:test02"
xmlns:HalconDotNet="clr-namespace:HalconDotNet;assembly=halcondotnet" x:Class="test02.MainWindow"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800">
<Grid>
<HalconDotNet:HWindowControlWPF Name="halconVideo" HorizontalAlignment="Left" Height="241" Margin="79,86,0,0" VerticalAlignment="Top" Width="407"/>
<Button Content="打开相机" HorizontalAlignment="Left" Height="62" Margin="554,86,0,0" VerticalAlignment="Top" Width="180" Click="Button_Click"/>
<Button Content="采集显示" HorizontalAlignment="Left" Height="59" Margin="554,177,0,0" VerticalAlignment="Top" Width="180" Click="Button_Click_1"/>
<Button Content="关闭相机" HorizontalAlignment="Left" Height="53" Margin="554,256,0,0" VerticalAlignment="Top" Width="180" Click="Button_Click_2"/>
</Grid>
</Window>
MainWindow.xaml.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using HalconDotNet;
using System.Windows.Threading;
namespace test02
{
/// <summary>
/// MainWindow.xaml 的交互逻辑
/// </summary>
public partial class MainWindow : Window
{
DispatcherTimer dispatcherTimer = null;
HObject ho_Image = null;//从相机中采集的图
HTuple hv_AcqHandle = null;//相机句柄
HTuple hv_WindowHandle = new HTuple();//窗口句柄
HTuple hv_Width = new HTuple();//图片的宽
HTuple hv_Height = new HTuple();//图片的高
public MainWindow()
{
InitializeComponent();
}
//打开相机
private void Button_Click(object sender, RoutedEventArgs e)
{
HOperatorSet.GenEmptyObj(out ho_Image);
hv_AcqHandle = new HTuple();
//Image Acquisition 01: Code generated by Image Acquisition 01
hv_AcqHandle.Dispose();
HOperatorSet.OpenFramegrabber("DirectShow", 1, 1, 0, 0, 0, 0, "default", 8, "rgb",
-1, "false", "default", "[0] ", 0, -1, out hv_AcqHandle);
HOperatorSet.SetFramegrabberParam(hv_AcqHandle, "grab_timeout", 2000);//设置相机参数
HOperatorSet.GrabImageStart(hv_AcqHandle, -1);//打开相机句柄
}
//采集显示
private void Button_Click_1(object sender, RoutedEventArgs e)
{
//启动定时器
dispatcherTimer = new DispatcherTimer();
dispatcherTimer.Tick += new EventHandler(dispatcherTimer_Tick);//添加事件(到达时间间隔后会自动调用)
dispatcherTimer.Interval = new TimeSpan(0, 0, 1);//设置时间间隔为1秒
dispatcherTimer.Start();//启动定时器
//打开窗口
HOperatorSet.OpenWindow(0, 0, halconVideo.Width, halconVideo.Height, halconVideo.HalconWindow, "visible", "", out hv_WindowHandle);
HDevWindowStack.Push(hv_WindowHandle);
}
//计时器时间(从相机中采图并显示)
private void dispatcherTimer_Tick(object sender, EventArgs e)//计时执行的程序
{
ho_Image.Dispose();
HOperatorSet.GrabImageAsync(out ho_Image, hv_AcqHandle, -1);//获取图片
HOperatorSet.GetImageSize(ho_Image, out hv_Width, out hv_Height);//获取图片的宽和高
if (HDevWindowStack.IsOpen())
{
HOperatorSet.SetPart(HDevWindowStack.GetActive(), 0, 0, hv_Height, hv_Width);//设置显示的范围
HOperatorSet.DispObj(ho_Image, HDevWindowStack.GetActive());//显示图片
}
}
//关闭相机
private void Button_Click_2(object sender, RoutedEventArgs e)
{
HOperatorSet.CloseFramegrabber(hv_AcqHandle);
ho_Image.Dispose();
}
}
}