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乐高 EV3 实验06 - 屏幕表情与音效，让机器人有点性格 · App Inventor 2 中文网
...d = true
}
when 计时器1.Timer() {
global 第几个 = 第几个 + 1
if 第几个 > length(音符) {
计时器1.TimerEnabled = false
标签_状态.Text = "弹完了"
} else {
EV3声音1.PlayTone(60, 音符[第几个], 250)
标签_状态.Text = join("第 ", 第几个, " 个音...
Storing SHA1 hash values in MySQL
...es just 4 bit per character and thus would need 160/4 = 40 characters. But if you use 8 bit per character, you would only need a 160/8 = 20 character long field.
So I recommend you to use BINARY(20) and the UNHEX function to convert the SHA1 value to binary.
I compared storage requirements for BIN...
How do I import CSV file into a MySQL table?
... -p Database \
TableName.csv
I found it at http://chriseiffel.com/everything-linux/how-to-import-a-large-csv-file-to-mysql/
To make the delimiter a tab, use --fields-terminated-by='\t'
share
|
...
Arduino 101 实验04 - 温湿度传感器，做一块环境看板 · App Inventor 2 中文网
...其余 DISABLED，上传。
库要装好 DHT-sensor-library 和 Adafruit Unified Sensor（见 实验00 第四节）。
DHT 是数字传感器，虽然测的是连续量，但走的是单总线数字协议，所以插 D 口不是 A 口。
这跟后面光照、土壤那几个模拟传感器不一...
How to convert an enum type variable to a string?
...
There really is no beautiful way of doing this. Just set up an array of strings indexed by the enum.
If you do a lot of output, you can define an operator<< that takes an enum parameter and does the lookup for you.
...
App Inventor 2 传感器应用教程 - 位置/方向/加速度传感器 · App Inventor 2 中文网
...1, 偏航)
}
function 偏航转方向(角度) {
var 方向 = "西北"
if 角度 >= 337.5 or 角度 < 22.5 {
var 方向 = "北"
} else if 角度 < 67.5 {
var 方向 = "东北"
} else if 角度 < 112.5 {
var 方向 = "东"
} else if 角度 < 157.5 {
var 方向 = "东南"
}...
What are “connecting characters” in Java identifiers?
...t i = Character.MIN_CODE_POINT; i <= Character.MAX_CODE_POINT; i++)
if (Character.isJavaIdentifierStart(i) && !Character.isAlphabetic(i))
System.out.print((char) i + " ");
}
prints
$ _ ¢ £ ¤ ¥ ؋ ৲ ৳ ৻ ૱ ௹ ฿ ៛ ‿ ⁀ ⁔ ₠ ₡ ₢ ₣ ₤ ₥ ₦ ₧ ...
mysql_fetch_array()/mysql_fetch_assoc()/mysql_fetch_row()/mysql_num_rows etc… expects parameter 1 to
...ult = mysql_query("SELECT * FROM Users WHERE UserName LIKE '$username'");
if($result === FALSE) {
die(mysql_error()); // TODO: better error handling
}
while($row = mysql_fetch_array($result))
{
echo $row['FirstName'];
}
mysqli extension
procedural style:
$username = mysqli_real_escape_...
MLKitTranslator 拓展：离线翻译 · App Inventor 2 中文网
...l("")
}
when MLKitTranslator1.GotModelState(languageTag, isDownloaded) {
if isDownloaded {
标签1.Text = "语言包已就绪"
} else {
标签1.Text = "正在下载语言包，约 30MB，请稍候…"
MLKitTranslator1.DownloadModel()
}
}
when MLKitTranslator1.ModelDownloaded() {
...
How can I capture the result of var_dump to a string?
...rray(
)),
'resource' => NULL, // Note that this resource pointer is now NULL
'null' => NULL,
)
var_dump ($debug_dump in above example):
array(8) {
["bool"]=>
bool(false)
["int"]=>
int(1)
["float"]=>
float(3.14)
["string"]=>
string(11) "hello world"
["arr...