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二进制数据专题：蓝牙、Socket、WebSocket、MQTT 收发字节 · App Inventor 2 中文网
...制帧
协议：A5 + 左轮速度（1 字节，有符号，-100~100）+ 右轮速度 + 异或校验。两个滑动条的范围设为 -100 到 100：
procedure 发送速度(左, 右) {
var 帧 = 二进制1.Build([165, 左, 右])
if (蓝牙客户端1.IsConnected) {
蓝牙客户...
Hash and salt passwords in C#
...*
* Version 3:
* PBKDF2 with HMAC-SHA256, 128-bit salt, 256-bit subkey, 10000 iterations.
* Format: { 0x01, prf (UInt32), iter count (UInt32), salt length (UInt32), salt, subkey }
* (All UInt32s are stored big-endian.)
*/
public string HashPassword(string password)
{
var prf = KeyDerivati...
DateTime2 vs DateTime in SQL Server
... is limited to 3 1/3 milliseconds, while DATETIME2 can be accurate down to 100ns.
Both types map to System.DateTime in .NET - no difference there.
If you have the choice, I would recommend using DATETIME2 whenever possible. I don't see any benefits using DATETIME (except for backward compatibility...
获取文件系统映像及恢复删除的数据（FAT文件系统格式描述） - C/C++ - 清泛...
...。FAT表中记录了每个簇的使用状况。 如果记录数值 是 100 则说明某个文件用到了簇号为100的簇，记录数值为500则说明用到了簇号为500的簇，以此类推。簇号为0和1的簇在数据区域没有使用，但是在FAT表中有它们的定义。在 FAT12,...
Method chaining - why is it a good practice, or not?
...etting multiple properties or calling utility-type methods.
foo.setHeight(100).setWidth(50).setColor('#ffffff');
foo.moveTo(100,100).highlight();
I do not use it when one or more of the chained methods would return any object other than foo in my example. While syntactically you can chain anythi...
In C, do braces act as a stack frame?
...
@pm100: The destructors will be called. That says nothing about the memory that those objects occupied.
– Donal Fellows
May 3 '10 at 16:12
...
Difference between virtual and abstract methods [duplicate]
...stpermonth(decimal amount)
{
return amount*12/100;
}
public virtual decimal totalamount(decimal Amount,decimal principleAmount)
{
return Amount + principleAmount;
}
}
public class derivedcla...
What does the JSLint error 'body of a for in should be wrapped in an if statement' mean?
...tialization;condition;update){
But what about:
var myarray = [];
myarray[100] = "foo";
myarray.push("bar");
Try this:
var myarray = [], i;
myarray[100] = "foo";
myarray.push("bar");
myarray[150] = "baz";
myarray.push("qux");
alert(myarray.length);
for(i in myarray){
if(myarray.hasOwnPropert...
When to use Common Table Expression (CTE)
...) in the CTE changes when the CTE is referenced more than once. select top 100 * into #tmp from master..spt_values order by 1,2,3,4 select A.number, COUNT(*) from #tmp A inner join #tmp B ON A.number = B.number+1 group by A.number vs with CTE AS (select top 100 * from master..spt_values order by 1,...
Bootstrap 3 modal vertical position center
...y: inline-block;
vertical-align: middle;
content: " ";
height: 100%;
}
}
.modal-dialog {
display: inline-block;
text-align: left;
vertical-align: middle;
}
And adjust a little bit .fade class to make sure it appears out of the top border of window, instead of center
...