如何处理应用程序GUI的冻结 [英] How to handle freezing of application GUI
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问题描述
我正在使用我在线下载的SDK，SourceAFIS编写指纹应用程序。我注意到模板提取需要一段时间才能完成，导致GUI冻结，有时会显示''''Not Responding''''所以我认为使用backgroundworker可以解决我的问题，但它仍然没有帮助。每个指纹样本的提取大约需要3秒。请问我怎么能停止这种挂起，它会使应用程序看起来很糟糕。谢谢
这是一个摘录。
I''m writting a fingerprint application using an SDK i downloaded online, SourceAFIS. I noticed that the template extraction took a while to complete, causing the GUI to freeze and sometimes shows ''''Not Responding'''' so i thought using a backgroundworker would solve my problem but it still didn''t help out. The extraction takes approximately 3 seconds per fingerprint sample. Please how can i get that hangging to stop, it makes the application look bad. Thanks
This is an extract.
<pre>private void enroll_Click(object sender, EventArgs e)
{
if (enrollmentWorkerBW.IsBusy == false)
{
enroll.Enabled = false;
enroll.Text = "Wait !";
progressPB.Visible = true;
enrollmentWorkerBW.RunWorkerAsync();
}
else
{
MessageBox.Show("Enrollment is already Running","Enrollment Message",MessageBoxButtons.OK,MessageBoxIcon.Information);
}
}
private void enrollmentWorkerBW_DoWork(object sender, DoWorkEventArgs e)
{
this.Invoke(new Function(delegate()
{
AfisEngine AFIS = new AfisEngine();
Bitmap bitmap = null;
DPFP.Capture.SampleConversion Convertor = new DPFP.Capture.SampleConversion(); // Create a sample convertor.
Fingerprint fingerprint;
for (int i = 0; i < printTemplates.Length; i++)
{
switch (i + 1)
{
case 1:
getTemplate(printTemplates[i], ref T_thumbR, (i + 1));
//getPartialPrintsTemplate(printSamples[i], ref partial_T_thumbR, (i + 1));
getSample(printSamples[i], ref S_thumbR, (i + 1));
bitmap = null;
Convertor.ConvertToPicture(printSamples[i], ref bitmap);
fingerprint = new Fingerprint();
fingerprint.BitmapImage = bitmap;
//st.Start();
AFIS.Extract(fingerprint);
if (fingerprint.Template != null)
partial_T_thumbR = fingerprint.Template;
else
partial_T_thumbR = null;
break;
case 2:
getTemplate(printTemplates[i], ref T_indexR, (i + 1));
//getPartialPrintsTemplate(printSamples[i], ref partial_T_indexR, (i + 1));
getSample(printSamples[i], ref S_indexR, (i + 1));
bitmap = null;
Convertor.ConvertToPicture(printSamples[i], ref bitmap);
fingerprint = new Fingerprint();
fingerprint.BitmapImage = bitmap;
//st.Start();
AFIS.Extract(fingerprint);
if (fingerprint.Template != null)
partial_T_indexR = fingerprint.Template;
else
partial_T_indexR = null;
break;
case 3:
getTemplate(printTemplates[i], ref T_middleR, (i + 1));
//getPartialPrintsTemplate(printSamples[i], ref partial_T_middleR, (i + 1));
getSample(printSamples[i], ref S_middleR, (i + 1));
bitmap = null;
Convertor.ConvertToPicture(printSamples[i], ref bitmap);
fingerprint = new Fingerprint();
fingerprint.BitmapImage = bitmap;
//st.Start();
AFIS.Extract(fingerprint);
if (fingerprint.Template != null)
partial_T_middleR = fingerprint.Template;
else
partial_T_middleR = null;
break;
case 4:
getTemplate(printTemplates[i], ref T_ringR, (i + 1));
//getPartialPrintsTemplate(printSamples[i], ref partial_T_ringR, (i + 1));
getSample(printSamples[i], ref S_ringR, (i + 1));
bitmap = null;
Convertor.ConvertToPicture(printSamples[i], ref bitmap);
fingerprint = new Fingerprint();
fingerprint.BitmapImage = bitmap;
//st.Start();
AFIS.Extract(fingerprint);
if (fingerprint.Template != null)
partial_T_ringR = fingerprint.Template;
else
partial_T_ringR = null;
break;
case 5:
getTemplate(printTemplates[i], ref T_smallR, (i + 1));
//getPartialPrintsTemplate(printSamples[i], ref partial_T_smallR, (i + 1));
getSample(printSamples[i], ref S_smallR, (i + 1));
bitmap = null;
Convertor.ConvertToPicture(printSamples[i], ref bitmap);
fingerprint = new Fingerprint();
fingerprint.BitmapImage = bitmap;
//st.Start();
AFIS.Extract(fingerprint);
if (fingerprint.Template != null)
partial_T_smallR = fingerprint.Template;
else
partial_T_smallR = null;
break;
case 6:
getTemplate(printTemplates[i], ref T_thumbL, (i + 1));
//getPartialPrintsTemplate(printSamples[i], ref partial_T_thumbL, (i + 1));
getSample(printSamples[i], ref S_thumbL, (i + 1));
bitmap = null;
Convertor.ConvertToPicture(printSamples[i], ref bitmap);
fingerprint = new Fingerprint();
fingerprint.BitmapImage = bitmap;
//st.Start();
AFIS.Extract(fingerprint);
if (fingerprint.Template != null)
partial_T_thumbL = fingerprint.Template;
else
partial_T_thumbL = null;
break;
case 7:
getTemplate(printTemplates[i], ref T_indexL, (i + 1));
//getPartialPrintsTemplate(printSamples[i], ref partial_T_indexL, (i + 1));
getSample(printSamples[i], ref S_indexL, (i + 1));
bitmap = null;
Convertor.ConvertToPicture(printSamples[i], ref bitmap);
fingerprint = new Fingerprint();
fingerprint.BitmapImage = bitmap;
//st.Start();
AFIS.Extract(fingerprint);
if (fingerprint.Template != null)
partial_T_indexL = fingerprint.Template;
else
partial_T_indexL = null;
break;
case 8:
getTemplate(printTemplates[i], ref T_middleL, (i + 1));
//getPartialPrintsTemplate(printSamples[i], ref partial_T_middleL, (i + 1));
getSample(printSamples[i], ref S_middleL, (i + 1));
bitmap = null;
Convertor.ConvertToPicture(printSamples[i], ref bitmap);
fingerprint = new Fingerprint();
fingerprint.BitmapImage = bitmap;
//st.Start();
AFIS.Extract(fingerprint);
if (fingerprint.Template != null)
partial_T_middleL = fingerprint.Template;
else
partial_T_middleL = null;
break;
case 9:
getTemplate(printTemplates[i], ref T_ringL, (i + 1));
//getPartialPrintsTemplate(printSamples[i], ref partial_T_ringL, (i + 1));
getSample(printSamples[i], ref S_ringL, (i + 1));
bitmap = null;
Convertor.ConvertToPicture(printSamples[i], ref bitmap);
fingerprint = new Fingerprint();
fingerprint.BitmapImage = bitmap;
//st.Start();
AFIS.Extract(fingerprint);
if (fingerprint.Template != null)
partial_T_ringL = fingerprint.Template;
else
partial_T_ringL = null;
break;
case 10:
getTemplate(printTemplates[i], ref T_smallL, (i + 1));
//getPartialPrintsTemplate(printSamples[i], ref partial_T_smallL, (i + 1));
getSample(printSamples[i], ref S_smallL, (i + 1));
bitmap = null;
Convertor.ConvertToPicture(printSamples[i], ref bitmap);
fingerprint = new Fingerprint();
fingerprint.BitmapImage = bitmap;
//st.Start();
AFIS.Extract(fingerprint);
if (fingerprint.Template != null)
partial_T_smallL = fingerprint.Template;
else
partial_T_smallL = null;
break;
}
}
}
}
推荐答案
你不应该处理冻结， 这没有道理。您需要在单独的线程中执行所有耗时的操作。并且线程需要与UI线程交互。怎么做？
你不能从非UI线程调用与UI相关的任何东西。相反，您需要使用Invoke或System.Windows.Threading的方法。 Dispatcher（对于Forms或WPF）或System.Windows.Forms.Control（仅限表单）。
您将在我过去的答案中找到有关其工作原理和代码示例的详细说明：
Control.Invoke（）与Control.BeginInvoke（） [ ^ ]，
使用Treeview扫描仪和MD5的问题 [ ^ ]。
另请参阅有关线程的更多参考资料：
如何让keydown事件在不同的操作上运行vb.net中的线程 [ ^ ]，
在启用禁用+多线程后控制事件未触发 [ ^ ]。
-SA
You should not "handle freezing", it makes no sense. You need to perform all time-consuming operations in a separate thread(s). And the thread would need to interact with the UI thread. How to do it?
You cannot call anything related to UI from non-UI thread. Instead, you need to use the methodInvokeorBeginInvokeofSystem.Windows.Threading.Dispatcher(for both Forms or WPF) orSystem.Windows.Forms.Control(Forms only).
You will find detailed explanation of how it works and code samples in my past answers:
Control.Invoke() vs. Control.BeginInvoke()[^],
Problem with Treeview Scanner And MD5[^].
See also more references on threading:
How to get a keydown event to operate on a different thread in vb.net[^],
Control events not firing after enable disable + multithreading[^].
—SA
不要更改应用程序以处理处理..用户必须等待指纹的评估..如果您使用后台处理程序将动画gif设置为等待..否则，如果使用vs2012，请检查您的代码。尝试分析代码，看看是否有任何问题专门挂着应用程序。
Dont Change the app to handle the processing.. The user has to wait for the evaluation of the fingerprint.. if your using the background handler put a animated gif up "Wait".. Otherwise check your code if using vs2012.. try the "Analyse code" and see if there is anything specifically hanging the app.
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