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APP INVENTOR硬件交互学习教程03——巧借arduino nano 配置HC-05 - 创客硬...
...intln("Enter AT commands!");
}
void loop() {
// read from port 1, send to port 0:
if (EEBlue.available()) {
int inByte = EEBlue.read();
Serial.write(inByte);
}
// read from port 0, send to port 1:
&nbs...
Unfortunately MyApp has stopped. How can I solve this?
...
This answer describes the process of retrieving the stack trace. Already have the stack trace? Read up on stack traces in "What is a stack trace, and how can I use it to debug my application errors?"
The Problem
Your application quit because an uncaught RuntimeException was thrown.
The mos...
Android: Getting a file URI from a content URI?
...
Actually, I just re-read the docs for getContentResolver().openInputStream(), and it works automatically for schemes of "content" or "file", so you don't need to check the scheme... if you can safely assume that it's always going to be content:/...
select * vs select column
.../O Pages (in SQL Server for e.g., each Page is 8 kilobytes). And every I/O read or write is by Page.. I.e., every write or read is a complete Page of data.
Because of this underlying structural constraint, a consequence is that Each row of data in a database must always be on one and only one page...
How do I grab an INI value within a shell script?
... above, e.g. grep =), the same for other unexpected errors.
If you need to read specific value under specific section, use grep -A, sed, awk or ex).
E.g.
source <(grep = <(grep -A5 '\[section-b\]' file.ini))
Note: Where -A5 is the number of rows to read in the section. Replace source with c...
mysqli_fetch_assoc() expects parameter / Call to a member function bind_param() errors. How to get t
...r (but that's a different story which is off topic for MySQLi, but you may read about it in the article linked above).
What to do with the error message you get?
First of all you have to locate the problem query. The error message contains the file name and the line number of the exact spot where ...
Why use String.Format? [duplicate]
...
I can see a number of reasons:
Readability
string s = string.Format("Hey, {0} it is the {1}st day of {2}. I feel {3}!", _name, _day, _month, _feeling);
vs:
string s = "Hey," + _name + " it is the " + _day + "st day of " + _month + ". I feel " + feeli...
How to re-sync the Mysql DB if Master and slave have different database incase of Mysql replication?
...replication from scratch:
At the master:
RESET MASTER;
FLUSH TABLES WITH READ LOCK;
SHOW MASTER STATUS;
And copy the values of the result of the last command somewhere.
Without closing the connection to the client (because it would release the read lock) issue the command to get a dump of the m...
Installing SciPy with pip
...Package Index, which pip searches.
easy_install scipy
Searching for scipy
Reading http://pypi.python.org/simple/scipy/
Reading http://www.scipy.org
Reading http://sourceforge.net/project/showfiles.php?group_id=27747&package_id=19531
Reading http://new.scipy.org/Wiki/Download
All is not lost, ...
How can I parse a JSON file with PHP? [duplicate]
...
I can't believe so many people are posting answers without reading the JSON properly.
If you foreach iterate $json_a alone, you have an object of objects. Even if you pass in true as the second parameter, you have a two-dimensional array. If you're looping through the first dimensio...