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dynamic_cast and static_cast in C++
... types are related. If the types are not related, you will get a compiler error. For example:
class B {};
class D : public B {};
class X {};
int main()
{
D* d = new D;
B* b = static_cast<B*>(d); // this works
X* x = static_cast<X*>(d); // ERROR - Won't compile
return 0;
}
d...
Apache Proxy: No protocol handler was valid
...s was happening for me in my Apache/2.4.18 (Ubuntu) setup. In my case, the error I was seeing was:
... AH01144: No protocol handler was valid for the URL /~socket.io/. If you are using a DSO version of mod_proxy, make sure the proxy submodules are included in the configuration using LoadModule.
T...
How to prompt for user input and read command-line arguments [closed]
..._variable1 = input ("Enter the first word or phrase: "), you will get an error: Traceback (most recent call last): return eval(raw_input(prompt)) File "<string>", line 1, in <module> NameError: name 'bad' is not defined
– IgorGanapolsky
Feb ...
How to find the mysql data directory from command line in windows
... in linux. It does not execute well in windows xp. the first command gives error - you have error in your sql syntax near where Variable_Name = 'dirname'. The second command gives error - unknown database information_schema
– Prabhu
Aug 1 '13 at 1:57
...
MySQL Conditional Insert
...
Did you run your answer? I keep getting ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'where... (running 5.6.34)
– hlin117
...
Devise Secret Key was not set
...ry to deploy the app using capistrano on the VPS server, I get the below error:
16 Answers
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Java - sending HTTP parameters via POST method easily
...tion really cumbersome to use. And you have to write a lot of boilerplate, error prone code. I needed a lightweight wrapper for my Android projects and came out with a library which you can use as well: DavidWebb.
The above example could be written like this:
Webb webb = Webb.create();
webb.post("...
Get free disk space
... RichardOD.
// Pinvoke for API function
[DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool GetDiskFreeSpaceEx(string lpDirectoryName,
out ulong lpFreeBytesAvailable,
out ulong lpTotalNumberOfBytes,
out ulong lpT...
Run a PostgreSQL .sql file using command line arguments
...
Of course, you will get a fatal error for authenticating, because you do not include a user name...
Try this one, it is OK for me :)
psql -U username -d myDataBase -a -f myInsertFile
If the database is remote, use the same command with host
psql -h hos...
Razor HtmlHelper Extensions (or other namespaces for views) Not Found
...
I had this same error in an MVC 4 application using Razor. In an attempt to clean up the web.config files, I removed the two webpages: configuration values:
<appSettings>
<add key="webpages:Version" value="2.0.0.0" />
<ad...