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问题 I am working on a c# project where i communicate with an USB device. I open the connection with: [DllImport("Kernel32.dll", SetLastError = true)] static extern Microsoft.Win32.SafeHandles.SafeFileHandle CreateFile(string filename, [MarshalAs(UnmanagedType.U4)]FileAccess fileaccess, [MarshalAs(UnmanagedType.U4)]FileShare fileshare, int securityattributes, [MarshalAs(UnmanagedType.U4)]FileMode creationdisposition, int flags, IntPtr template); private Microsoft.Win32.SafeHandles.SafeFileHandle

问题 I'm trying to get a list of documents that have the max value. I can specify it if I know the number of documents with max value (like in the solution in this another stackoverflow solution 'mongodb how to get max value from collections'), but I don't know how to do it if I don't know what the number of documents is. For example, using the following documents: {name:"a", age:10} {name:"b", age:11} {name:"d", age:12} {name:"c", age:12} So I know that there are 2 documents with max age of 12.

问题 I'm trying to get a list of documents that have the max value. I can specify it if I know the number of documents with max value (like in the solution in this another stackoverflow solution 'mongodb how to get max value from collections'), but I don't know how to do it if I don't know what the number of documents is. For example, using the following documents: {name:"a", age:10} {name:"b", age:11} {name:"d", age:12} {name:"c", age:12} So I know that there are 2 documents with max age of 12.

问题 I was implementing the Levenshtein distance function in Javascript, and I was wondering how much time it takes to run it with Wikedia's example ("sunday" & "saturday"). So I used console.time() and console.timeEnd() to determine the time spent for the function execution. for (var i = 0; i < 15; i++) { console.time("benchmark" + i); var result = LevenshteinDistance("sunday", "saturday"); console.timeEnd("benchmark" + i); } Since it was fluctuating between 0.4ms and 0.15ms, I used a loop and I

问题 We can't use *ngFor and *ngIf on the same element. A technique is to nest them. Almost everywhere it's OK, except in tables when we want to both loop over tr and print them conditionally. As suggested here we should use <template> , or <ng-template> elements, so that it won't be printed to the DOM. But I can't make it work. It simply doesn't print out anything. Here's a plunker to show it in action. What should I do? 回答1: As *ngIf is rendered as [ngIf], try using [ngIf] directly on template

问题 I was implementing the Levenshtein distance function in Javascript, and I was wondering how much time it takes to run it with Wikedia's example ("sunday" & "saturday"). So I used console.time() and console.timeEnd() to determine the time spent for the function execution. for (var i = 0; i < 15; i++) { console.time("benchmark" + i); var result = LevenshteinDistance("sunday", "saturday"); console.timeEnd("benchmark" + i); } Since it was fluctuating between 0.4ms and 0.15ms, I used a loop and I

问题 We can't use *ngFor and *ngIf on the same element. A technique is to nest them. Almost everywhere it's OK, except in tables when we want to both loop over tr and print them conditionally. As suggested here we should use <template> , or <ng-template> elements, so that it won't be printed to the DOM. But I can't make it work. It simply doesn't print out anything. Here's a plunker to show it in action. What should I do? 回答1: As *ngIf is rendered as [ngIf], try using [ngIf] directly on template

问题 We can't use *ngFor and *ngIf on the same element. A technique is to nest them. Almost everywhere it's OK, except in tables when we want to both loop over tr and print them conditionally. As suggested here we should use <template> , or <ng-template> elements, so that it won't be printed to the DOM. But I can't make it work. It simply doesn't print out anything. Here's a plunker to show it in action. What should I do? 回答1: As *ngIf is rendered as [ngIf], try using [ngIf] directly on template

问题 int x = Character.getNumericValue('A'); System.out.println(" the value of x is: " + x); // prints 10 I am looking for a method that takes in somemethod(10) and returns 'A'. Does such a method exist in java ? 回答1: As stated by Anubian Noob and Jeroen Vannevel, Character.GetNumericValue('A') = 10 , Character.GetNumericValue('a') = 10 and `Character.forDigit(10, 36) ='a'. So IMHO, what is closest of what you ask would be Character fromNumericValue(int x) { if ((x < 0) || (x > 35)) { throw new

问题 I need to upload a local file to Google Cloud Storage using Scala language. What is the easiest way to do it? This file will also need to be public downloaded later. 回答1: Use the java library provided by Google. It will work with scala as well. They provide an example of how to use this library here. It's in java but the scala equivalent should be easy to code. 来源： https://stackoverflow.com/questions/25540158/how-to-easily-send-local-file-to-google-cloud-storage-in-scala