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浅析为什么char类型的范围是 -128~+127 - C/C++ - 清泛网 - 专注C/C++及内核技术
...，全部位都表示数值，比如 char型，8位，用二进制表示为0000 0000 ~ 1111 1111
1111 1111 最大即为十进制255,所以 unsigned char 的范围为0~ 255，在这里普及一下2进制转十进制的方法， 二进制每一位的数值乘以它的位权(2^(n-1),n为自右向左...
Android View.getDrawingCache returns null, only null
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Checking if array is multidimensional or not?
...anywhere. If it has to be in the first item, you'd just do
is_array($arr[0]);
But, the most efficient general way I could find is to use a foreach loop on the array, shortcircuiting whenever a hit is found (at least the implicit loop is better than the straight for()):
$ more multi.php
<?php...
How to draw polygons on an HTML5 canvas?
...lineTo (live demo):
var ctx = canvas.getContext('2d');
ctx.fillStyle = '#f00';
ctx.beginPath();
ctx.moveTo(0, 0);
ctx.lineTo(100,50);
ctx.lineTo(50, 100);
ctx.lineTo(0, 90);
ctx.closePath();
ctx.fill();
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What do the different readystates in XMLHttpRequest mean, and how can I use them?
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The full list of readyState values is:
State Description
0 The request is not initialized
1 The request has been set up
2 The request has been sent
3 The request is in process
4 The request is complete
(from https://www.w3schools.com/js/js_ajax_http_respo...
Adding gif image in an ImageView in android
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First, copy your GIF image into Asset Folder of your app
create following classes and paste the ...
How to sort my paws?
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Alright! I've finally managed to get something working consistently! This problem pulled me in for several days... Fun stuff! Sorry fo...
MySQL - ORDER BY values within IN()
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edited Jun 6 '09 at 0:28
answered Jun 6 '09 at 0:16
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Scala type programming resources
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Overview
Type-level programming has many similarities with traditional, value-level programming. However, unlike value-level programm...
Fetch frame count with ffmpeg
...below.
ffprobe: Query the container
ffprobe -v error -select_streams v:0 -show_entries stream=nb_frames -of default=nokey=1:noprint_wrappers=1 input.mp4
This is a fast method.
Not all formats (such as Matroska) will report the number of frames resulting in the output of N/A. See the other met...