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Express res.sendfile throwing forbidden error
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Python argparse mutual exclusive group
...llness', '-b x'])
usage: PROG [-h] [--foo] {command_1,command_2} ...
PROG: error: unrecognized arguments: -b x
Good luck.
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How do I print the type of a variable in Rust?
...e of a variable and are willing to do it at compile time, you can cause an error and get the compiler to pick it up.
For example, set the variable to a type which doesn't work:
let mut my_number: () = 32.90;
// let () = x; would work too
error[E0308]: mismatched types
--> src/main.rs:2:29
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Running Bash commands in Python
...ss = subprocess.Popen(bashCommand.split(), stdout=subprocess.PIPE)
output, error = process.communicate()
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What do the different readystates in XMLHttpRequest mean, and how can I use them?
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Errors in the transfer still update readyState to 4. However, a completely interrupted transfer will reset readyState to 0. So, an error in the transfer that's a result of a redirect isn't really an "error" and you can choose...
How to lazy load images in ListView in Android
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There is a bug, sometimes it's fired:10-13 09:58:46.738: ERROR/AndroidRuntime(24250): Uncaught handler: thread main exiting due to uncaught exception 10-13 09:58:46.768: ERROR/AndroidRuntime(24250): java.lang.ArrayIndexOutOfBoundsException: Array index out of range: 0 10-13 09:58:4...
Postgres unique constraint vs index
... master values (0, 0);
INSERT 0 1
test=# insert into master values (0, 1);
ERROR: duplicate key value violates unique constraint "master_con_id_key"
DETAIL: Key (con_id)=(0) already exists.
test=# insert into master values (1, 0);
ERROR: duplicate key value violates unique constraint "master_uniq...
Difference between 'struct' and 'typedef struct' in C++?
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If you just said:
struct Foo { ... };
Foo x;
you would get a compiler error, because Foo is only defined in the tag namespace.
You'd have to declare it as:
struct Foo x;
Any time you want to refer to a Foo, you'd always have to call it a struct Foo. This gets annoying fast, so you can add...
Writing outputs to log file and console
... running the user script like log file name and path, redirect outputs and errors to log file, database connection details, etc ) which redirects all the outputs ( echo messages ) and errors to the log file from the executed script using the following code:
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Ruby 'require' error: cannot load such file
I've one file, main.rb with the following content:
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