外文分享

问题 I am struggling to simply create a folder in the users download directory on macos with this code: static func createFolderInDownloadsDirectory() { let downloadsDirectory = FileManager.default.urls(for: .downloadsDirectory, in: .userDomainMask).first! let downloadsDirectoryWithFolder = downloadsDirectory.appendingPathComponent("FolderToCreate") do { try FileManager.default.createDirectory(at: downloadsDirectoryWithFolder, withIntermediateDirectories: true, attributes: nil) } catch let error

问题 Trying to build a custom search using input box in datatable. Please find the fiddle version. http://jsfiddle.net/c6cu705n/ I am trying to load the table only with the value of 'San Francisco' and not with other values. tried all following option - no luck - any help would be grateful. //Option 1 $('#mytext').on('change', function () { table.columns(2).search( this.value ).draw(); }); //Option 2 $('#mytext').on('load', function () { table.columns(2).search( this.value ).draw(); }); //Option 3

问题 In a data.frame , I have a categorical variable for the language of a text. But, while most texts are only in one language, some have multiple languages. In my data, they appear in the same column, divided by comas: text = c("Text1", "Text2", "Text3") lang = c("fr", "en", "fr,en") d = data.frame(text, lang) Visually: text lang 1 Text1 fr 2 Text2 en 3 Text3 fr,en I'd like to plot the number of texts in each language, with Text3 being counted both in fr and in en . I found how to split, with: d

问题 I come from WPF and I don't know if it's possible to make a ListView to distribute items horizontally, with all the extras like mouse-wheel scrolling (mouse devices) and swiping (touch devices). I've tried this, but it doesn't behave like the vertical one. Example: I cannot scroll with the mouse-wheel. <ListView ScrollViewer.VerticalScrollBarVisibility="Disabled" ScrollViewer.HorizontalScrollBarVisibility="Auto" ItemsSource="{Binding Collection}" > <ListView.ItemsPanel> <ItemsPanelTemplate>

问题 Uploading file in chunks using Blob API. Here I want to check the md5 checksum of the blob. When I tried the below code it is working fine for text files, but it is returning different value for binary files. var reader = new FileReader(); reader.readAsBinaryString(blob); reader.onloadend = function () { var mdsum = CryptoJS.MD5(reader.result); console.log("MD5 Checksum",mdsum.toString()); }; How to calculate the md5 checksum of blob correctly for all types of files ? 回答1: Use the following

问题 I'm tring to concatenate two strings encoded to base64 but it doesn't really work, just prints the first string in concatanation: q = base64.b64encode("StringA") print q # prints an encoded string q = q+base64.b64encode("StringB") print q # prints an encoded string print base64.b64decode(q) # just prints "StringA" 回答1: You are decoding a string that is concatenation of two base64 strings. This is not correct. You should do something like this - base64.b64decode(base64.b64encode("StringA" +

问题 I'm tring to concatenate two strings encoded to base64 but it doesn't really work, just prints the first string in concatanation: q = base64.b64encode("StringA") print q # prints an encoded string q = q+base64.b64encode("StringB") print q # prints an encoded string print base64.b64decode(q) # just prints "StringA" 回答1: You are decoding a string that is concatenation of two base64 strings. This is not correct. You should do something like this - base64.b64decode(base64.b64encode("StringA" +

问题 This Python code displayed an image in full screen: blank_image = cv2.imread('blank.jpg') cv2.namedWindow("bw", cv2.WND_PROP_FULLSCREEN) cv2.setWindowProperty("bw", cv2.WND_PROP_FULLSCREEN, cv2.cv.CV_WINDOW_FULLSCREEN) cv2.imshow("bw", blank_image) cv2.waitKey(0) The problem is the code is going to run on a Linux machine without keyboard. Calling waitKey means the UI processing will not be done until a key event occurs, and thus the contradiction. Is there any way beside the waitKey, then?

问题 This Python code displayed an image in full screen: blank_image = cv2.imread('blank.jpg') cv2.namedWindow("bw", cv2.WND_PROP_FULLSCREEN) cv2.setWindowProperty("bw", cv2.WND_PROP_FULLSCREEN, cv2.cv.CV_WINDOW_FULLSCREEN) cv2.imshow("bw", blank_image) cv2.waitKey(0) The problem is the code is going to run on a Linux machine without keyboard. Calling waitKey means the UI processing will not be done until a key event occurs, and thus the contradiction. Is there any way beside the waitKey, then?

问题 When user upload image and when he try to drag the image , the image will display shadow along with dragging, but i don't want to display the shadow.... codepen : https://codepen.io/kidsdial/pen/xMNbVz $(document).ready(function () { // dont have a webserver so im using base64string instead var maskedImageUrlb ="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAaAAAAGECAYAAABwC/R5AAAACXBIWXMAAC4jAAAuIwF4pT92AAAF