大约有 40,000 项符合查询结果（耗时：0.0524秒） [XML]
super() in Java
...program 2 proofs our first statement of super() in Java.
Program 1
class Base
{
int a = 100;
}
class Sup1 extends Base
{
int a = 200;
void Show()
{
System.out.println(a);
System.out.println(a);
}
public static void main(String[] args)
{
new Sup1...
How can I know if a branch has been already merged into master?
...
You can use the git merge-base command to find the latest common commit between the two branches. If that commit is the same as your branch head, then the branch has been completely merged.
Note that git branch -d does this sort of thing already b...
How do I base64 encode (decode) in C?
...ve binary data in an unsigned char variable.
I need to convert them to PEM base64 in c.
I looked in openssl library but i could not find any function.
Does any body have any idea?
...
C++ “virtual” keyword for functions in derived classes. Is it necessary?
...Virtual functions
2 If a virtual member function vf is declared in a class Base and in a class Derived, derived directly or indirectly from Base, a member function vf with the same name, parameter-type-list (8.3.5), cv-qualification, and ref-qualifier (or absence of same) as Base::vf is declared, th...
Get image data url in JavaScript?
...s (just regular <img /> HTML tags). I'd like to get their content, base64 encoded preferably, without the need to redownload the image (ie. it's already loaded by the browser, so now I want the content).
...
Need to log asp.net webapi 2 request and response body to a database
... // let other handlers process the request
var result = await base.SendAsync(request, cancellationToken);
if (result.Content != null)
{
// once response body is ready, log it
var responseBody = await result.Content.ReadAsStringAsync();
...
Secure random token in Node.js
...e method crypto.randomBytes that generates a random Buffer. However, the base64 encoding in node is not url-safe, it includes / and + instead of - and _ . Therefore, the easiest way to generate such token I've found is
...
How can you encode a string to Base64 in JavaScript?
I have a PHP script that can encode a PNG image to a Base64 string.
26 Answers
26
...
How to use an existing database with an Android application [duplicate]
I have already created an SQLite database. I want to use this database file with my Android project. I want to bundle this database with my application.
...
Delete rows from a pandas DataFrame based on a conditional expression involving len(string) giving K
...this question's original title "How to delete rows from a pandas DataFrame based on a conditional expression" (which I understand is not necessarily the OP's problem but could help other users coming across this question) one way to do this is to use the drop method:
df = df.drop(some labels)
df =...