Programming languages

Oct

2012

How to fix npm “Cannot find module ‘graceful-fs'” error

Problem:

When running any npm command, you get a stacktrace similar to the following:

Error: Cannot find module 'graceful-fs'
at Function.Module._resolveFilename (module.js:338:15)
at Function.Module._load (module.js:280:25)
at Module.require (module.js:362:17)
at require (module.js:378:17)
at Object.<anonymous> (/usr/share/npm/lib/utils/ini.js:32:10)
   at Module._compile (module.js:449:26)
at Object.Module._extensions..js (module.js:467:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.require (module.js:362:17)

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Oct

2012

How to fix node-waf “ImportError: No module named Scripting” on Linux

Issue:

When executing node-waf, you get the following error message:

Traceback (most recent call last):
File "/usr/local/bin/node-waf", line 14, in <module>
import Scripting
ImportError: No module named Scripting

This also prevents node modules with native components to be built.

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Sep

2012

C++11 : Iterate over smart pointers using foreach loop

Problem:

In C++11 you want to iterate over a smart pointer (auto_ptr, shared_ptr, …). collection, say a std::vector, using the new for loop syntax.

Let’s try it out:

using namespace std;
shared_ptr<vector<int> > smartptr(/* A ptr to your vector */);
for(int s : smartptr) {
    /* do something useful */
}

When trying to compile this code, GCC emits the following error message (other lines are omitted for the sake of simplicity)

error: no matching function for call to 'begin(std::shared_ptr<std::vector<int> >&)'
error: no matching function for call to 'end(std::shared_ptr<std::vector<int> >&)'

or, when LANG=de is set:

Fehler: keine passende Funktion für Aufruf von »begin(std::shared_ptr<std::vector<int> >&)«
Fehler: keine passende Funktion für Aufruf von »end(std::shared_ptr<std::vector<int> >&)«

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Sep

2012

Automatically format size string in Node.js

Problem:

In NodeJS, you got a size of a file in bytes, but you want to format it for better readability.
For example, if your size is 10000 bytes, you want to print 10 kilobytes, but if it is 1200000, you want to print 1.20 Megabytes.

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Sep

2012

How to get filesize in Node.js

To determine the size of a file in NodeJS (e.g. to get the size of myfile.txt) use fs.stat() or fs.statSync() like this:

const fs = require("fs"); //Load the filesystem module
const stats = fs.statSync("myfile.txt");
const fileSizeInBytes = stats.size;
//Convert the file size to megabytes (optional)
const fileSizeInMegabytes = fileSizeInBytes / 1000000.0;

Another option is to use the following function:

function getFilesizeInBytes(filename) {
    const stats = fs.statSync(filename);
    const fileSizeInBytes = stats.size;
    return fileSizeInBytes;
}

Programming languages

How to fix npm “Cannot find module ‘graceful-fs'” error

Problem:

How to fix node-waf “ImportError: No module named Scripting” on Linux

Issue:

C++11 : Iterate over smart pointers using foreach loop

Problem:

Automatically format size string in Node.js

Problem:

How to get filesize in Node.js

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