小编Jan*_*itz的帖子

华为的P20在屏幕上方有一个类似iPhone的缺口.可以在Android Studio中模拟这个"缺口",以便可以测试应用程序在其上呈现的方式而无需拥有P20吗？我查看了设置,可以在硬件配置文件中选择"皮肤",但华为的P20不是它的一部分.

当我查询/mycollections?ql=Select * where name='dfsdfsdfsdfsdfsdf'我得到

{
  "action" : "get",
  "application" : "859e6180-de8a-11e4-9360-f1aabbc15f58",
  "params" : {
    "ql" : [ "Select * where name='dfsdfsdfsdfsdfsdf'" ]
  },
  "path" : "/mycollections",
  "uri" : "http://localhost:8080/myorg/myapp/mycollections",
  "entities" : [ {
    "uuid" : "2ff8961a-dea8-11e4-996b-63ce373ace35",
    "type" : "mycollection",
    "name" : "dfsdfsdfsdfsdfsdf",
    "created" : 1428577466865,
    "modified" : 1428577466865,
    "metadata" : {
      "path" : "/mycollections/2ff8961a-dea8-11e4-996b-63ce373ace35",
      "connections" : {
        "relations" : "/mycollections/2ff8961a-dea8-11e4-996b-63ce373ace35/relations"
      }
    }
  } ],
  "timestamp" : 1428589309204,
  "duration" : 53,
  "organization" : "myorg",
  "applicationName" : "myapp",
  "count" : …

这是我的代码

var fs = require('fs');
var fp = fs.openSync('binary.txt', "w");

var byte = '\0';
fs.writeSync(fp, byte, null, 'ascii');

在我打开binary.txt文件执行它之后,它包含0x20而不是预期的空字节.

现在我用的时候

fs.writeSync(fp, byte, null, 'utf-8');

我在文件中得到了想要的空字节.

import UIKit
import CoreNFC

class ViewController: UIViewController, NFCTagReaderSessionDelegate {

    var nfcTagReaderSession: NFCTagReaderSession?

    func tagReaderSessionDidBecomeActive(_ session: NFCTagReaderSession) {
        print("Tag reader did become active")
        print("isReady: \(nfcTagReaderSession?.isReady)")
    }

    func tagReaderSession(_ session: NFCTagReaderSession, didInvalidateWithError error: Error) {
        print("\(error)")
    }

    func tagReaderSession(_ session: NFCTagReaderSession, didDetect tags: [NFCTag]) {
        // this part is never called!
        print("got a Tag!")
        print("\(tags)")
    }

    @IBAction func clickedNFC(_ sender: Any) {
        nfcTagReaderSession = NFCTagReaderSession(pollingOption: [.iso14443], delegate: self)

        nfcTagReaderSession?.alertMessage = "Place the device on the innercover of the passport"
        nfcTagReaderSession?.begin()
        print("isReady: \(nfcTagReaderSession?.isReady)") …

我已经尝试使用disabled和!enabled,但它不工作.这是我的QSS代码:

QPushButton {
    background-color:#44c767;
    border-radius:5px;
    border:1px solid #18ab29;
    color:#ffffff;
    font-family:arial;
    font-size:15px;
    font-weight:bold;
    text-decoration:none;
    padding-right:10px;
    outline: 0;
}

QPushButton:hover:!pressed {
    background-color:#54d777;
}

QPushButton: pressed {
    background-color:#30b252;
}

QPushButton: disabled {
    background-color:#ff0000;
}

QPushButton: !enabled {
    background-color:#ff0000;
}

文档指的是disabled伪状态,但没有提供有关它的更多信息.

编辑

我正在使用QT5.3

这是我的单身人士

class MySingleton {
private:
    int myNumber;
public:
    static MySingleton &get() {
        static MySingleton instance;
        return instance;
    }

    int getMyNumber() const {
        return myNumber;
    }

    void setMyNumber(int myNumber) {
        MySingleton::myNumber = myNumber;
    }
};

这是测试它的代码

MySingleton t1 = MySingleton::get();
t1.setMyNumber(6);
printf("t1: %d \n", t1.getMyNumber());

MySingleton t2 = MySingleton::get();
printf("t2: %d \n", t2.getMyNumber());

现在我得到的输出是

t1: 6 
t2: 0 

但预计结果将是

t1: 6 
t2: 6 

它看起来像是MySingleton::get()在创建一个新实例,当然它不应该做.