我有一段Ruby代码，它从S3获取一个zip文件并将其保存在本地。
$(function () {
$("#oe-slide-left").on('click', function () {
SlideLeft();
});
$("#oe-slide-right").on('click', function () {
SlideRight();
});
});
function SlideLeft() {
var countLeft = $('#oe-testemonials').find('.oe-testemonial:visible').each(function () { }).length;
var countRight = $('#oe-testemonials').find('.oe-testemonial:hidden').each(function () { }).length;
if (countLeft > 3) {
$("#oe-testemonials div.oe-testemonial:visible").first().animate({ width: 'toggle' }, 350);
}
if (countLeft === 4) {
$("#oe-slide-left").hide();
}
if (countRight === 0) {
$("#oe-slide-right").show();
}
}
function SlideRight() {
var countLeft = $('#oe-testemonials').find('.oe-testemonial:visible').each(function () { }).length;
var countRight = $('#oe-testemonials').find('.oe-testemonial:hidden').each(function () { }).length;
if (countRight > 0) {
$("#oe-testemonials div.oe-testemonial:hidden").last().animate({ width: 'toggle' }, 350);
}
if (countRight <= 1) {
$("#oe-slide-right").hide();
}
if (countLeft === 3)
{
$("#oe-slide-left").show();
}
}
.oe-testemonials {
margin-top: 40px;
width: 100%;
overflow: hidden;
white-space: nowrap;
position: relative;
.slider-left-arrow, .slider-right-arrow {
position: absolute;
z-index: 1000;
top: 50%;
transform: translateY(-50%);
cursor: pointer;
&:hover {
background: #efe5e5;
opacity: 0.8;
}
}
.slider-left-arrow {
left: 15px;
}
.slider-right-arrow {
right: 15px;
}
.oe-testemonial {
width: 33%;
display: inline-block;
margin: auto;
white-space: normal;
.image-wrapper {
width: 100px;
height: 100px;
position: relative;
overflow: hidden;
border-radius: 50%;
margin: auto;
img {
display: inline;
margin: 0 auto;
height: 100%;
width: auto;
}
}
.description, .name, .title, .location {
width: 90%;
max-width: 300px;
text-align: center;
margin: auto;
}
.description {
border-bottom: 1px solid #999;
padding-bottom: 5px;
margin-bottom: 5px;
color: #413880;
}
.name {
font-family: 'Just Another Hand', cursive;
font-size: 24px;
}
.location {
color: #B3B3B3;
}
}
}
.description{
width: 100px !important;
}
<div id="oe-testemonials" class="oe-testemonials">
<img id="oe-slide-left" src="/Images/left_arrow.png" alt="Click To Slide Left" class="slider-left-arrow">
<img id="oe-slide-right" src="/Images/right_arrow.png" alt="Click To Slide Right" class="slider-right-arrow" style="display: none;">
<div class="oe-testemonial" style="display: inline-block;"><div class="image-wrapper"><img src="/Images/people/Erin_Hartigan-6947_sm.jpg" alt="Portfolio Image"></div><div class="description"><span>I think that OrthoEvidence is wonderful. It’s great that there are new avenues for people to learn about the evidence and have it summarized, which allows for a more transparent transfer of research to both practitioners and patients.</span></div><div class="name"><span>Dr. Erin Hartigan</span></div><div class="title"><span>Assistant Professor of Physical Therapy</span></div><div class="location"><span>University of New England</span></div></div><div class="oe-testemonial"><div class="image-wrapper"><img src="/Images/people/HiteshGopalan.jpg" alt="Portfolio Image"></div><div class="description"><span>As an Editor of a book and an associated website, I have been following 20- 30 journals every month. But now I have shifted my primary focus to OrthoEvidence where I get all quality information in one place.</span></div><div class="name"><span>Dr. Hitesh Gopalan</span></div><div class="title"><span>Editor</span></div><div class="location"><span>orthopaedicprinciples.com</span></div></div><div class="oe-testemonial"><div class="image-wrapper"><img src="/Images/people/DavidGryfe_sm.jpg" alt="Portfolio Image"></div><div class="description"><span>OrthoEvidence raises the bar on timely and relevant reviews of the medical literature. This is an indispensible service for every practitioner who strives to stay current.</span></div><div class="name"><span>Dr. David Gryfe</span></div><div class="title"><span>Chiropractor</span></div><div class="location"><span>Chiropractic Sports Specialist</span></div></div><div class="oe-testemonial"><div class="image-wrapper"><img src="/Images/people/AaronKrych_sm.jpg" alt="Portfolio Image"></div><div class="description"><span>OrthoEvidence allows the busy practicing surgeon, in a short period of time, to stay up to date with what is important with the changes in the literature.</span></div><div class="name"><span>Dr. Aaron Krych</span></div><div class="title"><span>Orthopaedic Surgeon</span></div><div class="location"><span>Mayo Clinic</span></div></div><div class="oe-testemonial"><div class="image-wrapper"><img src="/Images/people/JonathanRonquillo_sm.jpg" alt="Portfolio Image"></div><div class="description"><span>OrthoEvidence has made me more critical of available papers. It has made me look back at certain existing protocols...to improve existing practice.</span></div><div class="name"><span>Dr. Jonathan Ronquillo</span></div><div class="title"><span>Orthopaedic Surgeon</span></div><div class="location"><span>Asian Hospital and Medical Center</span></div></div><div class="oe-testemonial"><div class="image-wrapper"><img src="/Images/people/FrankSmith_sm.jpg" alt="Portfolio Image"></div><div class="description"><span>OrthoEvidence is the flag ship for enabling us to keep current whilst still working 60 hour weeks.</span></div><div class="name"><span>Dr. Frank Smith</span></div><div class="title"><span>Orthopaedic Surgeon</span></div><div class="location"><span>McMaster University</span></div></div><div class="oe-testemonial"><div class="image-wrapper"><img src="/Images/people/MarcosBritto_sm.jpg" alt="Portfolio Image"></div><div class="description"><span>OE is medical information of unparalleled quality, with papers revised, and a newsletter available in my inbox. It is the fastest and easiest way to stay updated on Orthopedics.</span></div><div class="name"><span>Dr. Marcos Britto da Silva</span></div><div class="title"><span>Orthopaedic Surgeon</span></div><div class="location"><span>Federal University of Rio de Janeiro</span></div></div></div>
此代码适用于某些文件，但不适用于其他文件。
对于那些不起作用的我，我得到了这个错误：
Errno :: EINVAL：无效的参数@ io_write - /path/to/file.zip
这可能是什么原因？
答案 0 :(得分：2)
身体可能太大了。错误信息确实没有多大意义，但这可能是原因。
要缓解此问题，请将其写入较小的块中。最简单（尽管不是最快）的方式是逐字逐句：
File.open('file_name.txt', 'wb') do |file|
body.each_char { |char| file.write char }
end
答案 1 :(得分：0)
StringIO和.read( chunk_size )。@ndnenkov是绝对正确的。文件本身可能太大而无法存储在内存中。此限制因操作系统，配置和可用资源而异，因系统而异。
但是，对于大文件，使用each_char可能会非常慢。我对一些方法和块大小以及一些不同的文件大小进行了基准测试，以进行比较。
13027836 bytes
13.03 megabytes
user system total real
write: 0.000767 0.004443 0.005210 ( 0.005312)
each_char: 5.756789 0.032231 5.789020 ( 5.797378)
each_byte: 8.997680 0.067377 9.065057 ( 9.179755)
StringIO 1 KB: 0.004029 0.006966 0.010995 ( 0.011648)
StringIO 1 MB: 0.016100 0.007118 0.023218 ( 0.023509)
StringIO 10 MB: 0.003347 0.006924 0.010271 ( 0.010334)
StringIO 100 MB: 0.000456 0.003758 0.004214 ( 0.007080)
StringIO 1 GB: 0.000468 0.003787 0.004255 ( 0.005037)
706583272 bytes
0.71 gigabytes
user system total real
write: 0.001035 0.285726 0.286761 ( 0.324529)
each_char: 362.444086 1.820033 364.264119 (365.362415)
each_byte: 548.788409 3.254867 552.043276 (553.390843)
StringIO 1 KB: 0.310588 0.331768 0.642356 ( 0.697581)
StringIO 1 MB: 0.302101 0.325285 0.627386 ( 0.671933)
StringIO 10 MB: 0.254845 0.294017 0.548862 ( 0.895430)
StringIO 100 MB: 0.471879 0.429933 0.901812 ( 1.181456)
StringIO 1 GB: 0.000471 0.260011 0.260482 ( 0.653977)
5577825775 bytes
5.58 gigabytes
user system total real
write: error error error error
each_char: 2926.215017 38.658114 2964.873131 (3008.319599)
each_byte: 4305.082576 35.090730 4340.173306 (4363.944091)
StringIO 1 KB: 4.145908 3.962275 8.108183 ( 9.490059)
StringIO 1 MB: 3.741062 2.779802 6.520864 ( 7.423770)
StringIO 10 MB: 2.916272 2.553926 5.470198 ( 6.271349)
StringIO 100 MB: 4.262794 3.007702 7.270496 ( 10.986725)
StringIO 1 GB: 2.063459 4.572225 6.635684 ( 9.212933)
基于此，我们最终使用了块大小为1MB的StringIO，但是您将需要尝试以下特定情况：
File.open('file_name.txt', 'wb') do |file|
bodyIO = StringIO.new( body )
until bodyIO.eof?
file.write( bodyIO.read( 1024*1024 ) ) # Write 1 MB chunks at a time to avoid Errno::EINVAL errors like `Invalid argument @ io_fread` and `Invalid argument @ io_write`.
end
end