I'm new to the threading world and trying to make my application works with threads. Here is what I got:
public static void ThreadProc()
{
Thread.Sleep(500);
MemoryMappedFile mmf = MemoryMappedFile.OpenExisting("SuperMMFofDoom", MemoryMappedFileRights.ReadWrite);
MemoryMappedViewAccessor accessor = mmf.CreateViewAccessor(0, sizeof(double)*3 + sizeof(int) *2);
Image imgS = new Image();
ImageTrigger myMessage;
Mutex imgMutex = new Mutex(false, "imgMutex");
while (threadRunning)
{
imgMutex.WaitOne();
accessor.Read(0, out myMessage);
// [...]
Dispatcher.Invoke(DispatcherPriority.Normal,
new Action(delegate()
{
// [...]
}),
new object[] { imgS, myMessage.performance }
);
imgMutex.ReleaseMutex();
}
}
This thing does compile when I comment all the Dispatcher.Invoke(). If I don't, I get an error about System.Windows.Threading.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority, System.Delegate, object) and it does not compile.
Any ideas?
I'm using VS2010 on Windows 7 Pro x64. This is a C# WPF project which also make use of some C++ DLLs also compiled in the same project. Finally, here is the header of the file:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Threading;
using Microsoft.Win32;
using System.Runtime.InteropServices;
using System.ComponentModel;
using System.IO;
using System.Reflection;
using System.Diagnostics;
using System.Threading;
using System.IO.MemoryMappedFiles;
using Common;
You should not be creating a new Action just casting your delegate as one:
Async:
Dispatcher.BeginInvoke(DispatcherPriority.Background, (Action)delegate()
{
});
Sync:
Dispatcher.Invoke(DispatcherPriority.Background, (Action)delegate()
{
});
Or if your not on a control or window:
Application.Current.Dispatcher.Invoke(DispatcherPriority.Background, (Action)delegate()
{
});
Related
I am trying to get the best searches from google, using keyword, and GoogleAPI, but It is always returning "System.Net.WebException: 'The remote server returned an error: (404) Not Found.'"
Am I doing anything wrong, or is it that GoogleAPI is outdated? Last time I checked and downloaded the .dll file was from 2010...
code:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using System.IO;
using System.Security.Cryptography;
using System.Text.RegularExpressions;
using System.Threading;
using System.Diagnostics;
using System.Collections;
using Microsoft.Win32;
using System.Web;
using System.Net.Mail;
using System.Net.Mime;
using System.ComponentModel;
using System.Net;
using System.Windows;
using Google.Apis.Services;
using Google.Apis.CustomSearchAPI.v1;
//Ignore most using statements, It was imported from my previous code.
namespace TYZDsag
{
internal class Program
{
static void Main(string[] args)
{
var client = new Google.API.Search.GwebSearchClient("https://www.google.com/");
var results = client.Search("uhuhuh", 12);
foreach (var webResult in results)
{
Console.WriteLine("{0}, {1}, {2}", webResult.Title, webResult.Url, webResult.Content);
//listBox1.Items.Add(webResult.ToString());
}
}
}
}
That's not how you initialize a service object using an api key.
using System;
using System.Threading.Tasks;
using Google.Apis.CustomSearchAPI.v1;
using Google.Apis.Services;
namespace customsearch
{
class Program
{
static async Task Main(string[] args)
{
Console.WriteLine("Hello World!");
var service = new CustomSearchAPIService(new BaseClientService.Initializer()
{
ApiKey = "XXX",
ApplicationName = "xyz",
});
var result = await service.Cse.List().ExecuteAsync();
}
}
}
Method: cse.list
How to create an api key
What did I miss?
VS could not be found Capture and HaarCascade.
I added all opencv .dll and "Copy always".
And added References of Emgu.
My Emgu is emgucv-windesktop 3.2.0.2682-сuda. Visual Studio 2017
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Emgu.CV;
using Emgu.Util;
using Emgu.CV.Structure;
using Emgu.CV.CvEnum;
using System.Windows;
namespace Emgu.FaceDetection
{
public partial class Form1 : Form
{
private Capture cap;
private HaarCascade haar;
public Form1()
{
InitializeComponent();
}
}
}
You can't use HaarCascade when using EmguCV3.X, it has been deprecated and replaced with CascadeClassifier
See here for an explination, the summary being it has changed to something akin to this:
CascadeClassifier _cascadeClassifier = new CascadeClassifier(#"C:\OPENCV_3.0.0\opencv\build\etc\haarcascades\" + "haarcascade_frontalface_alt2.xml");
A more complete example, and tutorial, using 3.X can be found here, a snippet from that blog:
private CascadeClassifier _cascadeClassifier;
_cascadeClassifier = new CascadeClassifier(Application.StartupPath + "/haarcascade_frontalface_alt_tree.xml");
using (var imageFrame = _capture.QueryFrame().ToImage<Bgr, Byte>())
{
if (imageFrame != null)
{
var grayframe = imageFrame.Convert<Gray, byte>();
var faces = _cascadeClassifier.DetectMultiScale(grayframe, 1.1, 10, Size.Empty); //the actual face detection happens here
foreach (var face in faces)
{
imageFrame.Draw(face, new Bgr(Color.BurlyWood), 3); //the detected face(s) is highlighted here using a box that is drawn around it/them
}
}
imgCamUser.Image = imageFrame;
}
I am very new to C#, visual studio, and related Microsoft work. So it is very likely that I messed something up and I hope some one can help me a bit on this.
I create an Console application and I am trying to run some tutorial C# code. There is a red line under when I try to load Windos.Storage.Pickers and all namespaces after it. I attempt to add the references, but I can't find what I need there.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Windows;
using Windows.Storage.Pickers;
using Windows.Storage.Streams;
using Windows.Graphics.Imaging;
using Windows.Media.FaceAnalysis;
using Windows.UI.Xaml.Media.Imaging;
using Windows.UI.Xaml.Shapes;
namespace ConsoleApp1
{
class Program
{
static void Main(string[] args)
{
FaceDetector faceDetector;
IList<DetectedFace> detectedFaces;
FileOpenPicker photoPicker = new FileOpenPicker();
photoPicker.ViewMode = PickerViewMode.Thumbnail;
photoPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
photoPicker.FileTypeFilter.Add(".jpg");
photoPicker.FileTypeFilter.Add(".jpeg");
photoPicker.FileTypeFilter.Add(".png");
photoPicker.FileTypeFilter.Add(".bmp");
StorageFile photoFile = await photoPicker.PickSingleFileAsync();
if (photoFile == null)
{
return;
}
}
}
}
the namespace you are tying to use is use for UWP development.
The problem is that you are trying to use it in Console Development.
Read about it here
I have got a problem when using EmguCV. Everytime I try to create SIFT or SURF detector I get exception "The type initializer for 'Emgu.CV.CvInvoke' threw an exception".
I've already: installed MSVCRT, copied OpenCV and Emgu dlls to the execution directory, added to solution OpenCV and Emgu dlls, added to solution Emgu.CV, Emgu.CV.GPU, Emgu.CV.ML, Emgu.CV.UI, Emgu.Util references.
Unfortunately I still got exception. I've tried to build SURFFeature example and it worked perfectly. It actually means that I make some mistake, but I can't find it... Please help...
Here's the code:
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Emgu.CV;
using Emgu.CV.CvEnum;
using Emgu.CV.Features2D;
using Emgu.CV.Structure;
using Emgu.CV.UI;
using Emgu.CV.Util;
using Emgu.CV.GPU;
namespace blablabla
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
try
{
Bitmap waveform_to_file = new Bitmap(2, 2);
//Emgu.CV.Features2D.SIFTDetector detector = new Emgu.CV.Features2D.SIFTDetector();//(0, 3, 0.04, 10, 1.6);//(400, true, 3, 4);//
SURFDetector surfCPU = new SURFDetector(500, false);//I got exception on these lines
Emgu.CV.Util.VectorOfKeyPoint keypoints = new Emgu.CV.Util.VectorOfKeyPoint();
Emgu.CV.Image<Emgu.CV.Structure.Gray, Byte> waveform_to_file_gray = new Emgu.CV.Image<Emgu.CV.Structure.Gray, byte>(waveform_to_file);
Emgu.CV.Features2D.ImageFeature<float>[] modKeyPointsArray = surfCPU/*detector*/.DetectFeatures(waveform_to_file_gray, null);
List<Emgu.CV.Features2D.ImageFeature<float>> modKeyPointsList = new List<Emgu.CV.Features2D.ImageFeature<float>>();
}
catch(Exception ex)
{
MessageBox.Show(ex.Message + ex.StackTrace);
}
}
}
}
Solution explorer:
http://ifotos.pl/zobacz/4JPG_wwaerwh.jpg
bin/debug:
http://ifotos.pl/zobacz/3JPG_wwaereh.jpg
I made a launcher for my game server. (World of Warcraft)
I want to get the installpath of the game, browsed by the user.
I'm using this code to browse, and get the installpath, then set some other strings from the installpath string, then just strore in my registry key.
using System;
using System.Drawing;
using System.Reflection;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using Microsoft.Win32;
using System.IO;
using System.Net.NetworkInformation;
using System.Diagnostics;
using System.Runtime;
using System.Runtime.InteropServices;
using System.Security;
using System.Security.Cryptography;
using System.Text;
using System.Net;
using System.Linq;
using System.Net.Sockets;
using System.Collections.Generic;
using System.Threading;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
string InstallPath, WoWExe, PatchPath;
private void Form1_Load(object sender, EventArgs e)
{
RegistryKey LocalMachineKey_Existence;
MessageBox.Show("Browse your install location.", "Select Wow.exe");
OpenFileDialog BrowseInstallPath = new OpenFileDialog();
BrowseInstallPath.Filter = "wow.exe|*.exe";
if (BrowseInstallPath.ShowDialog() == DialogResult.OK)
{
InstallPath = System.IO.Path.GetDirectoryName(BrowseInstallPath.FileName);
WoWExe = InstallPath + "\\wow.exe";
PatchPath = InstallPath + "\\Data\\";
LocalMachineKey_Existence = Registry.LocalMachine.CreateSubKey(#"SOFTWARE\ExistenceWoW");
LocalMachineKey_Existence.SetValue("InstallPathLocation", InstallPath);
LocalMachineKey_Existence.SetValue("PatchPathLocation", PatchPath);
LocalMachineKey_Existence.SetValue("WoWExeLocation", WoWExe);
}
}
}
}
The problem is:
On some computer, it doesnt stores like it should be. For example, your wow.exe is in C:\ASD\wow.exe, your select it with the browse windows, then the program should store it in the Existence registry key as C:\ASD\Data\ but it stores like this:
C:\ASDData , so it forgots a backslash :S
Look at this picture:
http://img21.imageshack.us/img21/2829/regedita.jpg
My program works cool on my PC, and on my friends pc, but on some pc this "bug" comes out :S
I have windows 7, with .NEt 3.5
Please help me.
Can you debug and see what InstallPath contains?
Try it with Path.Combine instead of string concatenation, e.g.:
WowExe = Path.Combine(InstallPath, "wow.exe");
PatchPath = Path.Combine(InstallPath, #"\Data\");