exception

问题 I am trying to check if a word has a trailing semicolon. I have the position of the word within a long string, and I want to check if the character at the position start of word + length of word is a : . It can be that the word is the last word in the string, and therefore trying to get the next char will raise an IndexException I have three ideas: 1) Check that we are not at the end of the string, and then check that it is not semicolon semicolon_pos = pos_word + len(word) # Possible

问题 If i click to Form1.cs in windows form , i get below exception, To prevent possible data loss before loading the designer , the following errors must be resolved: Loading this assembly would produce a different grant set from other instances.(Exception from HRESULT 0x80131401) Could not find type 'Gizmox.WebGUI.Forms.Form'. Please make sure that the assembly that contains this type is referenced. If this type is a part of your development project, make sure that the project has been

问题 I want to extract one frame from video in my app. The video is chosen from my storage device. After trying to call setDataSource I'm getting an IllegalArgumentException. Here is the part of my code: MediaMetadataRetriever med = new MediaMetadataRetriever(); med.setDataSource(imageUri.toString()); A value of imageUri is: content://com.android.providers.media.documents/document/video%3A59728 Is the path of my video in wrong format? I have also tried to use FFmpegMediaMetadataRetriever. 回答1: use

问题 I am learning about exceptions from a book and try/catch and the OS should terminate the following program. The book says, the message terminate called after throwing an instance of 'std::bad_alloc' should show up. But doesn't. I am using Arch Linux and the program is not stopping. It runs, fills the RAM a bit linear until it doesn't (at about 90%), the processor is working a lot but no freezing and no terminating. Is this a Windows only use case or how could I reproduce the error on a Linux

问题 While answering another question, Klin demonstrated an easy way of doing some loose timing tests. The question is "How expensive are exceptions?" There are mentions in the documentation and elsewhere that PL/PgSQL is slower than SQL for stored functions, and that EXCEPTION is expensive. I have no intuition about Postgres' performance in these situations, and figured I'd try out a few comparisons. Klin showed how to use the (wonderful) generate_series() function to make this easy. And here's

问题 While answering another question, Klin demonstrated an easy way of doing some loose timing tests. The question is "How expensive are exceptions?" There are mentions in the documentation and elsewhere that PL/PgSQL is slower than SQL for stored functions, and that EXCEPTION is expensive. I have no intuition about Postgres' performance in these situations, and figured I'd try out a few comparisons. Klin showed how to use the (wonderful) generate_series() function to make this easy. And here's

问题 I'm trying to add new object to my ArrayList if it satisfy the condition. But it got me this ConcurrentModificationExeption when I tried to run it. Hope you could help me: public void addTaskCollection(Task t){ ListIterator<Task> iterator = this.taskCollection.listIterator(); if(this.taskCollection.isEmpty()) this.taskCollection.add(t); while (iterator.hasNext()){ if(t.isOverlapped(iterator.next())) this.taskCollection.add(t); } } And here is the exeption error Exception in thread "main" java

问题 I have a WinForms application with a DataGridView that has its DataSource property set to a BindingSource (which in turn has its DataSource set to a BindingList). Everything works just fine, until I come to remove items from the BindingSource in response to a user request, the code I use for this is: try { // Get the item currently selected by the DGV var fc = (FooType)FooBindingSource.Current; // Remove the item from the binding source FooBindingSource.Remove(fch); } catch (Exception fault)

问题 I have a WinForms application with a DataGridView that has its DataSource property set to a BindingSource (which in turn has its DataSource set to a BindingList). Everything works just fine, until I come to remove items from the BindingSource in response to a user request, the code I use for this is: try { // Get the item currently selected by the DGV var fc = (FooType)FooBindingSource.Current; // Remove the item from the binding source FooBindingSource.Remove(fch); } catch (Exception fault)

问题 I have a WinForms application with a DataGridView that has its DataSource property set to a BindingSource (which in turn has its DataSource set to a BindingList). Everything works just fine, until I come to remove items from the BindingSource in response to a user request, the code I use for this is: try { // Get the item currently selected by the DGV var fc = (FooType)FooBindingSource.Current; // Remove the item from the binding source FooBindingSource.Remove(fch); } catch (Exception fault)