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7个App Inventor 2文件操作实用技巧，读写文件从未如此顺手 - App应用开发 ...
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技巧5：自制"文件是否存在"判断逻辑，预防空指针异常
官方的文件管理器有一个 是否存在 方法，但很多新手直接调用 读取文件 没判断存在性，App 运行时直接崩溃。正确的做法是三步走：
1. 先用 文件管理器.是否...
联网 App 第 5 课：带图商品墙，发布、搜索、详情与下架（综合，附 .aia 源...
...手自行车", "price": "180",
"desc": "骑了一年，刹车新换的", "img": "http://…/files/xxxx.jpg",
"seller": "小红", "time": "01-15 16:05"}
标签 goods 里存的就是这样的字典组成的列表。id 由「当前毫秒数 + 随机三位数」拼成，下架时靠它准确找到...
How to change the style of the title attribute inside an anchor tag?
...rectly on elements like <input type="text"/>, <textarea/>, <img>, etc. The easy solution is to wrap the element that's not a container in a <span> or <div> and have the pseudo-tooltip on the container.
Examples of using a pseudo-tooltip on a <span> wrapping a non...
converting Java bitmap to byte array
...m stream = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] byteArray = stream.toByteArray();
bmp.recycle();
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UIButton: set image for selected-highlighted state
... need to add addition line
[button setImage:[UIImage imageNamed:@"pressed.png"] forState:UIControlStateSelected | UIControlStateHighlighted];
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How to crop an image using C#?
...diting-saving-cropping-and-resizing
private static Image cropImage(Image img, Rectangle cropArea)
{
Bitmap bmpImage = new Bitmap(img);
return bmpImage.Clone(cropArea, bmpImage.PixelFormat);
}
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Fastest way to extract frames using ffmpeg?
... incurring more quality loss through quantization by transcoding to JPEG. (PNG is also lossless but tends to take much longer than JPEG to encode.)
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Creating a UIImage from a UIColor to use as a background image for UIButton [duplicate]
...Color(context, color.CGColor)
CGContextFillRect(context, rect)
let img = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return img
}
}
Swift 3.0
extension UIImage {
static func from(color: UIColor) -> UIImage {
let rect = CGRect(x: 0, y: ...
Regular expression to return text between parenthesis
...t; import re
>>> s = u'abcde(date=\'2/xc2/xb2\',time=\'/case/test.png\')'
>>> re.search(r'\((.*?)\)',s).group(1)
u"date='2/xc2/xb2',time='/case/test.png'"
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奇葩职位为何频现互联网？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...们哪些做得不够好，哪些地方还需要改进，以用户体验为指针，让用户成为我们的‘啄木鸟’，检查我们的产品和服务，保持我们的健康生态”。吴志祥表示，其实做旅游业最怕就是被人骂，“既然有痛点，那干脆从怕骂...