preview

问题 I'm having trouble getting a preview to work with what seems like a pretty simple struct. Customer is a CoreData entity: struct CustomerDetailView: View { @Environment(\.managedObjectContext) var moc @State var showNewCustomer = false var customer: Customer var body: some View { I've tried almost everything that doesn't work, including this: struct CustomerDetail_Previews: PreviewProvider { static var previews: some View { let context = (UIApplication.shared.delegate as! AppDelegate)

问题 I'm using the following code to capture an image using the custom Camera2 API. I am a beginner and I have no idea how to display a rectangular overlay on the camera preview. I did try the solutions available here, but I can't figure out how to fit it in my code. I need to achieve something like this to capture A4 sheets. Only the part of the image which is in the box must be captured and displayed in the next activity. MainActivity package com.example.customcamera; import android.Manifest;

问题 I'm using the following code to capture an image using the custom Camera2 API. I am a beginner and I have no idea how to display a rectangular overlay on the camera preview. I did try the solutions available here, but I can't figure out how to fit it in my code. I need to achieve something like this to capture A4 sheets. Only the part of the image which is in the box must be captured and displayed in the next activity. MainActivity package com.example.customcamera; import android.Manifest;

问题 I have a project, where i have a xml layout, with buttons and all of that in it, and i need the background to be the camera , so the preview is behind the buttons , how can i do that? 回答1: Here is xml from my project: <?xml version="1.0" encoding="UTF-8"?> <!-- Copyright (C) 2008 ZXing authors Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses

问题 I'm trying to display a preview of the uploaded pdf in my application but all I get so far is a broken image. I have installed the poppler gem as suggested in the active storage presentation for preview. Then i tried different ways but all are returning a broken image. <%= link_to bank.rib, rails_blob_path(bank.rib, disposition: "preview") %> or <%= image_tag bank.rib %> or where ' rib ' being the attached file ( has_one ) of the model BankAccount (here bank = BankAccount.find(id) ) bank.rib

问题 I want to display a FHD live-stream (25 fps) and overlay some (changing) text. For this I essentially use the code below. Basically it is Load frame ( cv::putText skipped here) Display frame if it's a multiple of delay but the code is super super slow compared to e.g. mpv and consumes way to much cpu-time ( cv::useOptimized() == true ). So far delay is my inconvenient fiddle-parameter to somehow make it feasible. delay == 1 results in 180 % CPU usage (full frame-rate) delay == 5 results in 80

问题 Is there any way I can create a Flutter Widget, on which that widget will be an position absolute(in CSS), which inside that widget will be the Camera Preview? I have created the widget, on which I can see it on bottom right side of the screen when I access the page, but when I add the CameraPreview plugin from Flutter, it makes it full screen. What I need is an option to make it inApp preview on that bottom right widget of the page/screen that I have created. the Square widget, is where I

问题 Is there any way I can create a Flutter Widget, on which that widget will be an position absolute(in CSS), which inside that widget will be the Camera Preview? I have created the widget, on which I can see it on bottom right side of the screen when I access the page, but when I add the CameraPreview plugin from Flutter, it makes it full screen. What I need is an option to make it inApp preview on that bottom right widget of the page/screen that I have created. the Square widget, is where I

问题 Where using .netcore 2.2 an upgrade to .netcore 3.0 This is the error that we encounter when running unit test: "Could not load type 'Context' from assembly 'Microsoft.AspNetCore.Hosting, Version=3.0.0.0" 回答1: These steps work on our project: Remove old packages <PackageReference Include="Microsoft.AspNetCore.Mvc" Version="2.2.0" /> <PackageReference Include="Microsoft.AspNetCore.Mvc.Cors" Version="2.2.0" /> <PackageReference Include="Microsoft.AspNetCore.TestHost" Version="2.2.0" />

问题 Where using .netcore 2.2 an upgrade to .netcore 3.0 This is the error that we encounter when running unit test: "Could not load type 'Context' from assembly 'Microsoft.AspNetCore.Hosting, Version=3.0.0.0" 回答1: These steps work on our project: Remove old packages <PackageReference Include="Microsoft.AspNetCore.Mvc" Version="2.2.0" /> <PackageReference Include="Microsoft.AspNetCore.Mvc.Cors" Version="2.2.0" /> <PackageReference Include="Microsoft.AspNetCore.TestHost" Version="2.2.0" />