WANQIANG WANG
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The issue is that Qt is evaluating the return value of the last statement in Javascript and converting it to a QVariant. It became time consuming because jQuery was returning the jQuery object, which was being evaluated in its entirety by Qt - and recursively at that. This also consumed RAM too. It wasn’t console.log that was fixing the issue, it was the “null” value it returned. I tested, and stapling “null” at the end of the script also worked.

Below is the updated code. 

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myWebElement->evaluateJavaScript( myScript + "; null" );

如果发现执行速度超级慢，按上面的方法处理。

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我使用的是Qt5.4.2, 遇到这个问题。对话框显示出来后，用鼠标改变一下大小就能显示出来。看起来像Qt的bug。 经反复尝试，发现修改QWizard的属性styleSheet为ClassicStyle就可以解决这个问题。 具体原因不清楚。

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Windows连接Linux 在Linux装下xrdp软件 

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1、安装xrdp sudo apt-get install xrdp 
2、配置xrdp /etc/xrdp/xrdp.ini 复制一个配置将其中的port 配置成5900及名称改下， service xrdp restart 
3、安装vino sudo apt-get install vino 
4、vino-preference 将第1 个开启 
5、gsettings set org.gnome.Vino require-encryption false 6、/usr/lib/vino/vino-server/

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https://blog.csdn.net/taonull/article/details/39249729 1.打开redmine控制台； 2.运行svn list –xml https://svn地址； 3.提示证书时选择p（永久保存ssl凭证）； 4.运行成功后，找到subversion_adapter.rb(redmine文件夹\apps\redmine\htdocs\lib\redmine\scm\adapters)，找到 def credentials_string str << " --username #{shell_quote(@login)}" unless @login.blank? str << " --password #{shell_quote(@password)}" unless @login.blank? || @password.blank? str << " --no-auth-cache --non-interactive" 修改为： str << " --username #{shell_quote(@login)}" unless @login.blank? str << " --password #{shell_quote(@password)}" unless @login.blank? || @password.blank? str << " --trust-server-cert --no-auth-cache --non-interactive --config-dir \"c:/Users/Administrator/AppData/Roaming/Subversion\""

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编译时报如下的错误：

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FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':app:lintVitalRelease'. > Could not resolve all files for configuration ':app:lintClassPath'. > Could not find com.android.tools.lint:lint-gradle:26.1.2. Searched in the following locations: file:/C:/Users/wwq/AppData/Local/Android/sdk/extras/m2repository/com/android/tools/lint/lint-gradle/26.1.2/lint-gradle-26.1.2.pom file:/C:/Users/wwq/AppData/Local/Android/sdk/extras/m2repository/com/android/tools/lint/lint-gradle/26.1.2/lint-gradle-26.1.2.jar file:/C:/Users/wwq/AppData/Local/Android/sdk/extras/google/m2repository/com/android/tools/lint/lint-gradle/26.1.2/lint-gradle-26.1.2.pom file:/C:/Users/wwq/AppData/Local/Android/sdk/extras/google/m2repository/com/android/tools/lint/lint-gradle/26.1.2/lint-gradle-26.1.2.jar file:/C:/Users/wwq/AppData/Local/Android/sdk/extras/android/m2repository/com/android/tools/lint/lint-gradle/26.1.2/lint-gradle-26.1.2.pom file:/C:/Users/wwq/AppData/Local/Android/sdk/extras/android/m2repository/com/android/tools/lint/lint-gradle/26.1.2/lint-gradle-26.1.2.jar https://jcenter.bintray.com/com/android/tools/lint/lint-gradle/26.1.2/lint-gradle-26.1.2.pom https://jcenter.bintray.com/com/android/tools/lint/lint-gradle/26.1.2/lint-gradle-26.1.2.jar Required by: project :app

解决方法： 检查根 build.gradle 文件。

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allprojects { repositories { jcenter() // mavenCentral() google() //**要加这行** // maven { url 'https://jitpack.io' } } }

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java中有三种移位运算符

  • << : 左移运算符，num << 1,相当于num乘以2

  • > : 右移运算符，num >> 1,相当于num除以2

  • > : 无符号右移，忽略符号位，空位都以0补齐

下面是测试代码`public static void main(String[] args) {
int number = 10;
//原始数二进制
printInfo(number);
number = number << 1;
//左移一位
printInfo(number);
number = number >> 1;
//右移一位
printInfo(number);
}

/**
 * 输出一个int的二进制数
 * @param num
 */
private static void printInfo(int num){
    System.out.println(Integer.toBinaryString(num));
}` 输出结果： 1010 10100 1010

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下面是示例代码

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(void)savePreset
{

    UIAlertController * alertController = [UIAlertController alertControllerWithTitle:@"Preset to Remoter buttons" message:nil preferredStyle:UIAlertControllerStyleActionSheet];
    
    UIAlertAction * preset1 = [UIAlertAction actionWithTitle:@"Preset1" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        NSLog(@"send preset 1");
    }];
    
    UIAlertAction * preset2 = [UIAlertAction actionWithTitle:@"Preset2" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        NSLog(@"send preset 2");
    }];
    
    UIAlertAction * preset3 = [UIAlertAction actionWithTitle:@"Preset3" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        NSLog(@"send preset 3");
    }];
    
    UIAlertAction * preset4 = [UIAlertAction actionWithTitle:@"Preset4" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        NSLog(@"send preset 4");
    }];
    
    UIAlertAction* defaultAction = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel
                    handler:^(UIAlertAction * action) {}];
    
    [alertController addAction:defaultAction];
    
    [preset1 setValue:[[UIImage imageNamed:@"fire"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal] forKey:@"image"];
    [preset2 setValue:[[UIImage imageNamed:@"left"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal] forKey:@"image"];
    [preset3 setValue:[[UIImage imageNamed:@"right"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal] forKey:@"image"];
    [preset4 setValue:[[UIImage imageNamed:@"down"] imageWithRenderingMode:UIImageRenderingModeAutomatic] forKey:@"image"];
    [alertController addAction:preset1];
    [alertController addAction:preset2];
    [alertController addAction:preset3];
    [alertController addAction:preset4];
    [self presentViewController:alertController animated:YES completion:nil];
}

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下面是实现这部分功能的代码：

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UIImage * img = [UIImage imageNamed:@"doorlogo"];

CGSize itemSize = CGSizeMake(60, 60);
UIGraphicsBeginImageContext(itemSize);
CGRect imageRect = CGRectMake(0, 0, itemSize.width, itemSize.height);
[img drawInRect:imageRect];
cell.imageView.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();