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Create an Excel file in C# without Microsoft Office or Third party plugins

Max — Sat, 18 Apr 2020 18:07:00 +0000

What I’m about to say seems paradoxical, but the reality is that in open environments (as in PHP for example) it is often easier and we have less problems in creating or converting files in proprietary systems, compared to what happens on frameworks such as Microsoft’s .Net; this is the case when we have to create an Excel file (XLS / XLSX) in C# without having a copy of Microsoft Office on the server, or other third party plugins installed, without the right libraries in our project we will have several headaches. A quick solution is to use the open-source library ExcelLibrary. This looks to be a port of the PHP ExcelWriter, it’s very simple, small and easy to use.

Using ExcelLibrary

Workbook workbook = new Workbook();
workbook.Open("Book1.xlsx");
Sheet sheet = workbook.Sheet("Sheet1");
Row row = sheet.Row(2);
Cell cell = row.Cell(3);
string text = cell.Value;

Main features

No dependencies except .NET Framework 4.5. Easy to include in other solutions.
Built and extendable with LINQ. Most collections in the library (e.g. Workbook.Sheets or Row.Cells) is of type IEnumerable, which allows you to use LINQ queries to find exactly what you need.
Respects the visibility of sheets, rows and columns. Set the IncludeHidden option to trueto return hidden objects.
Well-tested. The library is being developed using principles of Test-driven development (TDD). A large set of unit tests verifies that new bugs are not introduced on code changes.
Well-documented. A software library is only as useful as its documentation.

Another valid alternative is EPPLUS5 however it has a new license model from version 5, it’s still free to use in some cases, but will require a commercial license to be used in a commercial business.

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How to parse and process HTML/XML in PHP

Max — Wed, 15 Apr 2020 16:44:00 +0000

Simple HTML DOM is a great open-source parser:

simplehtmldom.sourceforge

It treats DOM elements in an object-oriented way, and the new iteration has a lot of coverage for non-compliant code. There are also some great functions like you’d see in JavaScript, such as the “find” function, which will return all instances of elements of that tag name.

I’ve used this in a number of tools, testing it on many different types of web pages, and I think it works great.

These are the main features:

HTML DOM parser written in PHP 5+ that lets you manipulate HTML in a very easy way
Require PHP 5+
Supports invalid HTML
Find tags on an HTML page with selectors just like jQuery
Extract contents from HTML in a single line

How to get HTML elements:

// Create DOM from URL or file
$html = file_get_html('http://www.example.com/');

// Find all images
foreach($html->find('img') as $element)
       echo $element->src . '
';

// Find all links
foreach($html->find('a') as $element)
       echo $element->href . '
';

How to modify HTML elements:

// Create DOM from string
$html = str_get_html('Hello
World');

$html->find('div', 1)->class = 'bar';

$html->find('div[id=hello]', 0)->innertext = 'foo';

echo $html;

Extract content from HTML:

// Dump contents (without tags) from HTML
echo file_get_html('http://www.google.com/')->plaintext;

Scraping Slashdot:

// Create DOM from URL
$html = file_get_html('http://slashdot.org/');

// Find all article blocks
foreach($html->find('div.article') as $article) {
    $item['title']     = $article->find('div.title', 0)->plaintext;
    $item['intro']    = $article->find('div.intro', 0)->plaintext;
    $item['details'] = $article->find('div.details', 0)->plaintext;
    $articles[] = $item;
}

print_r($articles);

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Access a variable declared in a phtml from another phtml in Magento2

Max — Tue, 14 Apr 2020 16:25:00 +0000

Having two blocks in the catalog_product_view.xml file like this:

...

To access a variable declared in the first block from the second block, you can set the variable with register from the first phtml, then you get the value in the 2nd phtml with registry

To do things well without injecting direclty the objectManager in phtml, you have to create some function your product block, so in your block : app/code/Vendor/Modulename/Block/Custom.phpassuming that your variable name is : $tech add the following code:

_coreRegistry = $coreRegistry;
    }

    /**
     * Set var data
     */
    public function setTechData($data)
    {
        $this->_coreRegistry->register('tech', $data);
    }

    /**
     * Get var data
     */
    public function getTechData()
    {
        return $this->_coreRegistry->registry('tech');
    }
}

Then in your First phtml :


setTechData($tech); ?>

Then, in the Second phtml :

getTechData(); ?> //you'll get your tech value here

Besides, you can also do that in phtml to test without the block solution,

First phtml :

create("Magento\Framework\Registry")->register('tech', $tech);
?>

Second phtml :

create("Magento\Framework\Registry")->registry('tech');
echo $techData;
?>

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How to export an ASP Associative Array to XML

Max — Sat, 15 Feb 2020 16:27:57 +0000

“Asp Associative Array Class” provides a method to easly export all items to a well formatted XML string. For example, You can create a new *.ASP file :

[sourcecode language=”vb”]

<%
Dim Person, God
Set Person = New AssociativeArray
Set God = New AssociativeArray
Person("name") = "Max"
Person("surname") = "Vergelli"
God("name") = "Jesus"
God("surname") = "Christ"
Dim World
Set World = New AssociativeArray
World(1) = Person
World(2) = God
response.Write World.ToXML()
%>
[/sourcecode]

And You will get out the following XML:

[sourcecode language=”xml”]

[/sourcecode]

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