首页 \ 问答 \ `require'：无法加载此类文件 - rdoc / usage（LoadError）(`require': cannot load such file — rdoc/usage (LoadError))

`require'：无法加载此类文件 - rdoc / usage（LoadError）(`require': cannot load such file — rdoc/usage (LoadError))

 运行我的脚本时出现此错误： 
 

`require': cannot load such file -- rdoc/usage (LoadError)

 

 从 
 

/Users/S/.rvm/rubies/ruby-2.2.2/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- rdoc/usage (LoadError)
from /Users/S/.rvm/rubies/ruby-2.2.2/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from pdf.rb:34:in `<main>'

 

 我的Gemfile中有rdoc 
 

gem 'rdoc', '~> 4.2.2'

 

 我也试过没有指定版本。 在我的脚本中，我需要gems和rdoc / usage： 
 

require 'rubygems'
require 'rdoc/usage'

 

 我已经运行了gem install rdoc 
 

Depending on your version of ruby, you may need to install ruby rdoc/ri data:

<= 1.8.6 : unsupported
 = 1.8.7 : gem install rdoc-data; rdoc-data --install
 = 1.9.1 : gem install rdoc-data; rdoc-data --install
>= 1.9.2 : nothing to do! Yay!
Successfully installed rdoc-4.2.2

 

 因为我正在运行ruby 2.2.2应该不需要安装ruby roc / ri数据。 （我试了一下，正如预期没有效果）。 
 

 非常感谢任何帮助，谢谢。 

I'm getting this error when running my script:
 

`require': cannot load such file -- rdoc/usage (LoadError)

 

from
 

/Users/S/.rvm/rubies/ruby-2.2.2/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- rdoc/usage (LoadError)
from /Users/S/.rvm/rubies/ruby-2.2.2/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from pdf.rb:34:in `<main>'

 

I have rdoc in my Gemfile
 

gem 'rdoc', '~> 4.2.2'

 

and I have also tried without specifying version. In my script I've required gems and rdoc/usage:
 

require 'rubygems'
require 'rdoc/usage'

 

I have run gem install rdoc
 

Depending on your version of ruby, you may need to install ruby rdoc/ri data:

<= 1.8.6 : unsupported
 = 1.8.7 : gem install rdoc-data; rdoc-data --install
 = 1.9.1 : gem install rdoc-data; rdoc-data --install
>= 1.9.2 : nothing to do! Yay!
Successfully installed rdoc-4.2.2

 

and as I'm running ruby 2.2.2 should not need to install ruby roc/ri data. (I tried at a loss and as expected no effect). 
 

Any help would be greatly appreciated, thanks. 

原文：https://stackoverflow.com/questions/39875498
更新时间：2023-03-19 06:03

最满意答案

 这样做： 
 

 project.pro 
 

QT       += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = project
TEMPLATE = app
macx {
    LIBS += -framework Foundation
    OBJECTIVE_SOURCES += helper.m
}
SOURCES += main.cpp

 

 helper.m 
 

#include <Foundation/NSUserDefaults.h>
#include <Foundation/NSDictionary.h>
#include <Foundation/NSString.h>

void disableMomentumScroll(void)
{
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    NSDictionary *appDefaults = [NSDictionary dictionaryWithObject:@"NO" forKey:@"AppleMomentumScrollSupported"];
    [defaults registerDefaults:appDefaults];
}

 

 main.cpp 
 

#include <QApplication>
#include <QGraphicsScene>
#include <QGraphicsView>

#ifndef Q_OS_MAC
void disableMomentumScroll() {}
#else
extern "C" { void disableMomentumScroll(); }
#endif

float rnd(float range) { return (qrand() / static_cast<float>(RAND_MAX)) * range; }

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    disableMomentumScroll();
    QGraphicsScene s;
    for (int n = 0; n < 30; n++) {
        s.addRect(rnd(500), rnd(3000), rnd(200), rnd(1000), QPen(Qt::red), QBrush(Qt::gray));
    }
    QGraphicsView w(&s);
    w.show();
    return a.exec();
}


This does it:
 

project.pro
 

QT       += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = project
TEMPLATE = app
macx {
    LIBS += -framework Foundation
    OBJECTIVE_SOURCES += helper.m
}
SOURCES += main.cpp

 

helper.m
 

#include <Foundation/NSUserDefaults.h>
#include <Foundation/NSDictionary.h>
#include <Foundation/NSString.h>

void disableMomentumScroll(void)
{
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    NSDictionary *appDefaults = [NSDictionary dictionaryWithObject:@"NO" forKey:@"AppleMomentumScrollSupported"];
    [defaults registerDefaults:appDefaults];
}

 

main.cpp
 

#include <QApplication>
#include <QGraphicsScene>
#include <QGraphicsView>

#ifndef Q_OS_MAC
void disableMomentumScroll() {}
#else
extern "C" { void disableMomentumScroll(); }
#endif

float rnd(float range) { return (qrand() / static_cast<float>(RAND_MAX)) * range; }

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    disableMomentumScroll();
    QGraphicsScene s;
    for (int n = 0; n < 30; n++) {
        s.addRect(rnd(500), rnd(3000), rnd(200), rnd(1000), QPen(Qt::red), QBrush(Qt::gray));
    }
    QGraphicsView w(&s);
    w.show();
    return a.exec();
}

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