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OnNotify函数 ON_NOTIFY消息总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
..._NOTIFY_EX_RANGE(这部分不理解，先放一放)
If you want more than one object in the notification routing to handle a message, you can use ON_NOTIFY_EX(or ON_NOTIFY_EX_RANGE) rather than ON_NOTIFY (or ON_NOTIFY_RANGE). The only difference between the EX version and the regular version is tha...
Converting a Java Keystore into PEM Format
...pe pkcs12
openssl pkcs12 -in foo.p12 -out foo.pem
if you have more than one certificate in your JKS keystore, and you want to only export the certificate and key associated with one of the aliases, you can use the following variation:
keytool -importkeystore -srckeystore foo.jks \
-destkeysto...
adb not finding my device / phone (MacOS X)
Doing Android development on a Mac and this very new phone I have doesn't show up in the devices list in adb . Lots of other phones and devices work fine for me so I know my setup is good.
...
How does the String class override the + operator?
... An implementation may choose to perform conversion and concatenation
in one step to avoid creating and then discarding an intermediate
String object. To increase the performance of repeated string
concatenation, a Java compiler may use the StringBuffer class or a
similar technique to reduce...
What is this weird colon-member (“ : ”) syntax in the constructor?
... will be called once and the object will be constructed and initialized in one operation.
If you use assignment then the fields will be first initialized with default constructors and then reassigned (via assignment operator) with actual values.
As you see there is an additional overhead of creati...
Confused by python file mode “w+”
...y hundreds of people. Don't just click the "Add Comment" button where only one or two people will see it.
– rmunn
Jul 2 '18 at 1:05
...
How to implement WiX installer upgrade?
...earning WiX is like trying to figure out the obscure incantations that someone decided 'made sense' to perform a simple action. Kind of like UNIX.
– mmr
Mar 25 '09 at 0:44
6
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Encrypt Password in Configuration Files? [closed]
...Exception {
return Base64.getDecoder().decode(property);
}
}
One problem remains: Where should you store the password that you use to encrypt the passwords? You can store it in the source file and obfuscate it, but it's not too hard to find it again. Alternatively, you can give it as a...
What's a concise way to check that environment variables are set in a Unix shell script?
...
Parameter Expansion
The obvious answer is to use one of the special forms of parameter expansion:
: ${STATE?"Need to set STATE"}
: ${DEST:?"Need to set DEST non-empty"}
Or, better (see section on 'Position of double quotes' below):
: "${STATE?Need to set STATE}"
: "${DEST:...
Multiple Updates in MySQL
...le rows at once, is there a way to update multiple rows at once (as in, in one query) in MySQL?
17 Answers
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