Category Archives: Programming languages

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How to multiply a value by a constant in WinRT XAML

Posted by | UWP, XAML |

The easiest way to accomplish this task is to use converter provided below. It is written in C++ but this convertor can be easily converted to C#:

[Windows::Foundation::Metadata::WebHostHidden]
public ref class MultiplicationConverter sealed : Windows::UI::Xaml::Data::IValueConverter
{
public:

    virtual Platform::Object^ Convert(Platform::Object^ value, Windows::UI::Xaml::Interop::TypeName targetType, Platform::Object^ parameter, Platform::String^ language);

    virtual Platform::Object^ ConvertBack(Platform::Object^ value, Windows::UI::Xaml::Interop::TypeName targetType, Platform::Object^ parameter, Platform::String^ language);

private:

    Platform::Object^ InternalConvert(Platform::Object^ value, Platform::Object^ parameter, bool forward);
};

(more…)

10
04
15
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Using Visual Leak Detector with MS Visual Studio 2013

Posted by | C++ | Tagged |

Go to Tools->Extensions and Updates, download and install Using Visual Leak Detector:

Using Visual Leak Detector

Create a header file, named, for example, CommonTools.h containing the following:

#pragma once

#include "C:\Program Files (x86)\Visual Leak Detector\include\vld.h" 

#pragma comment(lib, "C:\\Program Files (x86)\\Visual Leak Detector\\lib\\Win32\\vld.lib")

Include CommonTools.h in at least one file in all the C++ projects in your solution. Build debug version of the program. Visual Leak Detector will write the information on memory leaks to Output window when the program exits.

11
03
15
 1 Comment

How I fixed “error LNK2005: _DllMain@12 already defined in msvcrtd.lib”

Posted by | C++ | Tagged |

Today I got “error LNK2005: _DllMain@12 already defined in msvcrtd.lib” while linking some C++ CLI project with MFC support in MS Visual Studio 2013. As described in A LNK2005 error occurs when the CRT library and MFC libraries are linked in the wrong order in Visual C++A LNK2005 error occurs when the CRT library and MFC libraries are linked in the wrong order in Visual C++ article, I added /verbose:lib linker option:

MS Visual Studio Linker options

(more…)

28
02
15
 1 Comment

How to install Java Plug-in for FireFox browser on Windows

Posted by | Java, Windows |

Probably it is a trivial question, but the answer is not always obvious. The main rule is to follow the right link like this: https://www.java.com/en/download/help/firefox_online_install.xml. As the result you will get:

JavaPlugin for FireFox

To check if it works or not follow this link: http://java.com/en/download/installed8.jsp.

02
04
14
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Using a WPF control in a MFC application

Posted by | .NET, C#, C++, Win32 | Tagged |

I’ve been working on some MFC application and to apply my WPF knowledge I added a WPF control written in C# to my MFC CView with the following code:

int CMyView::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
    if (CView::OnCreate(lpCreateStruct) == -1)
        return -1;

    try
    {
        gcroot<hwndsource ^> hwnd_source = gcnew HwndSource(0, WS_VISIBLE | WS_CHILD, 0, 0, 0, "HwndSource", IntPtr(m_hWnd));

        MyWpfControl ^ control = gcnew MyWpfControl();

        hwnd_source->RootVisual = control;
    }
    catch (Exception ^ ex)
    {
        String ^ msg = ex->Message;
    }

    return 0;
}

All that I needed to do is to follow the steps described in this post: How do I host WPF content in MFC Applications, fix VS2012 bug described here, and got rid of std::mutex and std::lock_guard replacing them with the following classes using typedefs:

(more…)

16
06
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How to debug a PHP script

Posted by | PHP |

It could be useful sometimes to know what variables are defined at particular point of PHP script in order to have a better understanding of the code you are debugging. In contrast with C++, PHP has a magic function get_defined_vars ( void ) that  returns an array of all defined variables with their values so we can output all variable names with the following line of code:

print_r(array_keys(get_defined_vars()));

(more…)

08
04
13
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How to compile BOOST with MS Visual Studio 2010-2017

Posted by | C++ | Tagged , |

Fortunately, to compile BOOST with MS VC 2010 we need Visual Studio Command Prompt and five commands:

Navigate to BOOST directory, for example:

F:
cd F:\Projects\Lib\boost_1_53_0

(more…)

12
01
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How to pass a Dictionary<Key, Value> from C# to PHP

Posted by | C#, PHP | Tagged , |

I believe that the simplest way to pass complex data from C# to PHP is through WCF service. See my previous post How to implement WCF service in PHP for more details.

Let assume we have a WCF service contract that has the following method with some nested dictionary as a parameter:

[ServiceContract]
public interface IStore
{
    [OperationContract]
    void UpdateRows(Dictionary<int, Dictionary<string, object>> rows);
}

Below I provided the sample implementation of UpdateRows in PHP that iterates through nested dictionaries (first level called ‘rows’ and second level called ‘properties’):

(more…)

07
12
12
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Generalization of auto_ptr<T> for working with Win32 API

Posted by | C++, Win32 |

A long time ago, STL had auto_ptr<Type> class that automatically deleted a dynamically allocated C++ object when control leaves a block. Personally, I believe that auto_ptr<Type> was typically used in simple scenarios as a local variable or a class member but theoretically it is even possible to declare a vector of auto_ptr<Type> because auto_ptr<Type> stores an ownership indicator and its copy constructor transfers the ownership from the instance being copied, so vector::push_back(…) and vector::resize(…) functions works correctly.

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19
10
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 1 Comment

How to implement WCF service in PHP

Posted by | .NET, C#, PHP | Tagged , |

Today I implemented my first PHP Web Service and successfully used it by C# client or, more precisely, I created WCF service contract in C# and implemented it in PHP.  A new option “singlewsdl” in WCF 4.5  helped me a lot. Using this option I generated the service description as a single WSDL-file without additional XSD-files containing the data contracts of the service. Then I uploaded this WSDL-file on my Web Server and written PHP code for all the methods of the service.

(more…)

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