 - `.h`: header file, its a source file containing declarations (as opposed to .cpp, .cxx, etc. containing implementations),

 - `.lib`: static library may contain code or just links to a dynamic library. Either way it&#39;s compiled code that you link with your program. The static library is included in your .exe at link time.

 - `.dll`: dynamic library. Just like a static one but you need to deploy it with your .exe file because it&#39;s loaded at run time.


* **H** Declares the interface to a library - including functions, structures, and constants. Written in the C language.
* **LIB** Either declares the binary interface to a dynamic library (DLL) *or* contains the binary code of a library.
* **DLL** A dynamic library - your application shares these with the system or you use them to keep your code base organized.
* **DEF** A textual description of functions exported by a DLL.


Maybe this is a stupid question but it&#39;s bugging me.

I have a bi-directional one to many relationship of Employee to Vehicles. When I persist an Employee in the database for the first time (i.e. it has no assigned ID) I also want its associated Vehicles to be persisted. 

This works fine for me at the moment, except that my saved Vehicle entity is not getting the associated Employee mapped automatically, and in the database the employee_id foreign key column in the Vehicle table is null.

My question is, is it possible to have the Vehicle&#39;s employee persisted at the same time the Employee itself is being persisted? I realise that the Employee would need to be saved first, then the Vehicle saved afterwards. Can JPA do this automatically for me? Or do I have to do something like the following:

    
    Vehicle vehicle1 = new Vehicle();
    Set&lt;Vehicle&gt; vehicles = new HashSet&lt;Vehicle&gt;();
    vehicles.add(vehicle1);

    Employee newEmployee = new Employee(&quot;matt&quot;);
    newEmployee.setVehicles(vehicles);
    Employee savedEmployee = employeeDao.persistOrMerge(newEmployee);

    vehicle1.setAssociatedEmployee(savedEmployee);
    vehicleDao.persistOrMerge(vehicle1);

Thanks!

Edit: As requested, here&#39;s my mappings (without all the other methods etc.)

    @Entity
    public class Employee {
        @Id
        @GeneratedValue(strategy = GenerationType.AUTO)
        @Column(name=&quot;employee_id&quot;)
        private Long id;
    
        @OneToMany(mappedBy=&quot;associatedEmployee&quot;, cascade=CascadeType.ALL)
        private Set&lt;Vehicle&gt; vehicles;
      
        ...
    
    }
    
    @Entity 
    public class Vehicle {
        @Id
        @GeneratedValue(strategy = GenerationType.AUTO)
        @Column(name=&quot;vehicle_id&quot;)
        private Long id;
    
        @ManyToOne
        @JoinColumn(name=&quot;employee_id&quot;)
        private Employee associatedEmployee;
      
        ...
    }

I just realised I should have had the following method defined on my Employee class:

    public void addVehicle(Vehicle vehicle) {
    	vehicle.setAssociatedEmployee(this);
    	vehicles.add(vehicle);
    }


Now the code above will look like this:

    Vehicle vehicle1 = new Vehicle();

    Employee newEmployee = new Employee(&quot;matt&quot;);
    newEmployee.addVehicle(vehicle1);
    Employee savedEmployee = employeeDao.persistOrMerge(newEmployee);

Much simpler and cleaner. Thanks for your help everyone!


JPA - Persisting a One to Many relationship

Is there a way to see the code coverage when using nUnit? I know there&#39;s such a feature in Visual Studio, but can you use it with nUnit or only with the built-in vs unit tests?

Code coverage with nUnit?

Why in a project should I include some *.lib, .h or some other files? And what are these things used for?


What&#39;s the differences between .dll , .lib, .h files?

<p>Why in a project should I include some *.lib, .h or some other files? And what are these things used for?</p>


In a C++ class declaration:

    class Thing
    {
        ...
    };

why must I include the semicolon?

Why must I put a semicolon at the end of class declaration in C++?

We see Google, Firefox some AJAX pages show up a list of probable items while user types characters.

Can someone give a good algorithm, data structure for implementing autocomplete?

What is the best autocomplete/suggest algorithm,datastructure [C++/C]

All over the web, code samples have `for` loops which look like this:

    for(int i = 0; i &lt; 5; i++)

while I used the following format:

    for(int i = 0; i != 5; ++i)

I do this because I believe it to be more efficient, but does this really matter in most cases?

Technical reasons behind formatting when incrementing by 1 in a &#39;for&#39; loop?

How to remove spaces from a string object in C++.  
For example, how to remove leading and trailing spaces from the below string object.  


    //Original string: &quot;         This is a sample string                    &quot;
    //Desired string: &quot;This is a sample string&quot;

The string class, as far as I know, doesn&#39;t provide any methods to remove leading and trailing spaces.  

To add to the problem, how to extend this formatting to process extra spaces between words of the string. For example,

    // Original string: &quot;          This       is         a sample   string    &quot; 
    // Desired string:  &quot;This is a sample string&quot;  

Using the string methods mentioned in the solution, I can think of doing these operations in two steps.

 1. Remove leading and trailing spaces.
 2. Use **find_first_of, find_last_of, find_first_not_of, find_last_not_of and substr**, repeatedly at word boundaries to get desired formatting.
 

  


Removing leading and trailing spaces from a string

Does the `map::find` method support case insensitive search? I have a map as follows:

    map&lt;string, vector&lt;string&gt; &gt; directory;

and want the below search to ignore case:

    directory.find(search_string);

How can I make the map::find operation case insensitive?

Here is what I want, inside the `BACKUPDIR`, I want to execute `cscript /nologo c:\deletefile.vbs %BACKUPDIR%` until number of files inside the folder is greater than 21(`countfiles` holds it).
Here is my code:

    @echo off
    SET BACKUPDIR=C:\test
    for /f %%x in (&#39;dir %BACKUPDIR% /b ^| find /v /c &quot;::&quot;&#39;) do set countfiles=%%x
    
    for %countfiles% GTR 21 (
    cscript /nologo c:\deletefile.vbs %BACKUPDIR%
    set /a countfiles-=%countfiles%
    )

While loop in batch

There are a couple of files in our git-controlled codebase that I&#39;d like to rename.  Specifically, I just want to change the case of the file, so that `sourceCode.java` becomes `SourceCode.java`, for example.  The catch: I&#39;m on a Windows box, and the filesystem thinks those are the same file name.

How can I get Windows and Git to recognize that change and check it in?
The change of the file name should not be ignored, but committed to git.

Change case of a file on Windows?

I have a batch file that automates copying a bunch of files from one place to the other and back for me. Only thing is as much as it helps me I keep accidentally selecting that command off my command buffer and mass overwriting uncommitted changes. 

What code would I need for my .bat file to make it output &quot;**Are you sure?**&quot;, and make me type &lt;kbd&gt;Y&lt;/kbd&gt; before it ran the rest of the file?

If anything other than &lt;kbd&gt;Y&lt;/kbd&gt; is typed, it should exit execution on that line.

When I call `exit`, it closes `cmd.exe` which is not what I want.

How can I make an &quot;are you sure&quot; prompt in a Windows batch file?

I created a local GIT repository on Windows. Let&#39;s call it AAA. I staged, committed, and pushed the contents to GitHub. `git@github.com:username/AAA.git` 

I realized I made a mistake with the name.

On GitHub, I renamed it to `git@github.com:username/BBB.git` 

Now, on my Windows machine, I need to change `git@github.com:username/AAA.git` to `git@github.com:username/BBB.git` because the settings are still trying to &quot;push&quot; to `git@github.com:username/AAA.git` but I need to push to `git@github.com:username/BBB.git` now.

How could I do that?


How can I change the remote/target repository URL on Windows?

How is it possible to run a [PowerShell][1] script without displaying a window or any other sign to the user?

In other words, the script should run quietly in the background without any sign to the user.

Extra credit for an answer that does not use third party components :)

  [1]: http://en.wikipedia.org/wiki/Windows_PowerShell


How to run a PowerShell script without displaying a window?

I&#39;ve got a C# project (call it `MainProj`) which references several other DLL projects.  By adding these projects to `MainProj`&#39;s references, it will build them and copy their resulting DLL&#39;s to MainProj&#39;s working directory.

What I&#39;d like to do is have these referenced DLL&#39;s be located in a subdirectory of `MainProj`&#39;s working directory, i.e. MainProj/bin/DLLs, rather than the working directory itself.

I&#39;m not a very experienced C# programmer, but coming from the C++ world, I&#39;m assuming one approach would be to remove the project references and explicitly load the required DLL&#39;s by path and filename (i.e. in C++, `LoadLibrary`).  What I&#39;d prefer to do however, if there&#39;s a way, would be to set some sort of &quot;reference binary path&quot;, so they&#39;d all be auto-copied to this subdir when I build (and then be referenced from there without me needing to explicitly load each).  Is such a thing possible?

If not, what&#39;s the preferred method in C# to accomplish what I&#39;m after (i.e. something with `Assembly.Load` / `Assembly.LoadFile` / `Assembly.LoadFrom`? Something in `AppDomain` perhaps, or `System.Environment`?)


Set Custom Path to Referenced DLL&#39;s?

I developed an application that depends on a DLL file. When I *debug* my application, the applicationwould complain that:

&gt; &quot;This application has failed to start because xxx.dll was not found.&quot;

So I have to copy the DLL file into the same directory as my .vcproj file.

Is there a way to set the project to look for the DLL file in (preferably) some relative path or (not preferred) some absolute path?

Similar concept to how we set include and library path in the project settings.

I mean when I *debug* my application (hitting &lt;kbd&gt;F5&lt;/kbd&gt;) the above error would pop up.


How do I set the path to a DLL file in Visual Studio?

Is there a way to load a 32bit DLL library (something with the same usage as LoadLibrary) I would like to use that function along with GetProcAddress.

I looked at WOW, but it does not seem to offer the functionality. The functionality should exist, since tools like DependencyWalker are able to read the symbols of a 32bit dll even though its 64bits.

thanks

Load 32bit DLL library in 64bit application

On a Windows XP Professional SP3 with Internet Explorer 8 box, when I run Dependency Walker on an executable of mine it reports that:
IESHIMS.DLL and WER.DLL can&#39;t be found.

1.  Do I need these DLL&#39;s?
2.  Where can I get them?

I believe they are supposed to located in 
C:\Windows\System32\Wer.dll   and
C:\Program Files\Internet Explorer\Ieshims.dll

Dependency Walker reports IESHIMS.DLL and WER.DLL missing?

During compilation and linking, what is use of .exp? What is the difference between .lib and .dll? I know that .lib will be used, while linking and .dll will be used when running the program. But what exactly is the difference between .lib and .dll?

Does .lib file not contain the code for the functions coming from .dll files?
What is the need for using two separate files?

Please clarify.

What is the use of .exp and what is the difference between .lib and .dll?

When dividing your code up into multiple files just what exactly should go into an .h file and what should go into a .cpp file? 

What should go into an .h file?

Let&#39;s say I have a makefile with the rule

    %.o: %.c
     gcc -Wall -Iinclude ...

I want *.o to be rebuilt whenever a header file changes. Rather than work out a list of dependencies, whenever any header file in `/include` changes, then all objects in the dir must be rebuilt. 

I can&#39;t think of a nice way to change the rule to accomodate this, I&#39;m open to suggestions. Bonus points if the list of headers doesn&#39;t have to be hard-coded 

Makefile, header dependencies

I want to be able to create a collection of functions in a header file that I could #include in one of my C Programs.

How can I create C header files

Normally we use 

    @interface interface_name : parent_class &lt;delegates&gt;
    {
    ......
    }
    @end 

method in .h file and in .m file we synthesis the properties of variables declared in .h file.

But in some code, this @interface.....@end method is kept in the .m file also. What does it mean?  What is the difference between them?

Also give some words about getters and setters for the interface file that is defined in .m file...


Thanks in Advance

Difference between @interface definition in .h and .m file

I&#39;m looking to create two classes, each of which contains an object of the other class type. How can I do this? If I can&#39;t do this, is there a work-around, like having each class contain a *pointer* to the other class type? Thanks!

Here&#39;s what I have:

File: **bar.h**

    #ifndef BAR_H
    #define BAR_H
    #include &quot;foo.h&quot;
    class bar {
    public:
      foo getFoo();
    protected:
      foo f;
    };
    #endif

File: **foo.h**

    #ifndef FOO_H
    #define FOO_H
    #include &quot;bar.h&quot;
    class foo {
    public:
      bar getBar();
    protected:
      bar b;
    };
    #endif

File: **main.cpp**

    #include &quot;foo.h&quot;
    #include &quot;bar.h&quot;
    
    int
    main (int argc, char **argv)
    {
      foo myFoo;
      bar myBar;
    }


*$ g++ main.cpp*

    In file included from foo.h:3,
                     from main.cpp:1:
    bar.h:6: error: ‘foo’ does not name a type
    bar.h:8: error: ‘foo’ does not name a type

Content Type	Original Author	Original Content on Stackoverflow
Question	MemoryLeak	View Question on Stackoverflow
Solution 1 - C++	siukurnin	View Answer on Stackoverflow
Solution 2 - C++	Frank Krueger	View Answer on Stackoverflow
Solution 3 - C++	john david	View Answer on Stackoverflow

What's the differences between .dll , .lib, .h files?

C++ Problem Overview

C++ Solutions

Solution 1 - C++

Solution 2 - C++

Solution 3 - C++

Code coverage with nUnit?

JPA - Persisting a One to Many relationship

Attributions