native methods in c sharp

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C#

C#4.0

Hi. Does anybody know how to use NativeMethods in c sharp? Does it have special namespace?

Posted 1-Jun-12 11:31am

aliprogrammer

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Oleksandr Kulchytskyi · Answer 1 · 2012-06-01T11:39:00

Solution 1

You probably talking about WinApi methods in meaning of word NativeMethods.
If it's true, you must look forward to use P/Invoke in .NET enviroment.

For example calling of method GetDC from User32.dll could be declared in next format:

C#

[DllImport("user32.dll")]
private static extern IntPtr GetDC(IntPtr hWnd);

Take a closer look to P\Invoke
Good luck.

Posted 1-Jun-12 11:39am

Oleksandr Kulchytskyi

Updated 1-Jun-12 11:40am

v2

Comments

Zoltán Zörgő 1-Jun-12 17:40pm

Good mind-reading :) My vote +5.
By the way, NativeMethods is a concept not a language entity. (http://msdn.microsoft.com/en-us/library/ms182161.aspx)

Oleksandr Kulchytskyi 1-Jun-12 17:48pm

Yep ) it's an interesting article. Thanks for share link)

aliprogrammer 1-Jun-12 17:46pm

These codes will set the windows calculator into a windows form application. But the question is how to use the NativeMethods.SetParent in the third line. Does it have special namespace?

System.Diagnostics.Process p = System.Diagnostics.Process.Start("calc.exe");
p.WaitForInputIdle();
NativeMethods.SetParent(p.MainWindowHandle, this.Handle);

Please help me to use NativeMethods in the third line.

Oleksandr Kulchytskyi 1-Jun-12 17:51pm

=) Now issue became more clearly)
NativeMethods is a third-party class , which is not related to .NET environment.

aliprogrammer 1-Jun-12 17:52pm

What should I do?

Oleksandr Kulchytskyi 1-Jun-12 17:54pm

=)) You should implement some class whith this method)

public static class NativeMethods
{
[DllImport("user32.dll", SetLastError = true)]
public static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);
}

Oleksandr Kulchytskyi 1-Jun-12 17:59pm

Is it any unclear moments ?

lewax00 · Answer 2 · 2012-06-01T11:48:00

In addition to Oleksandr's answer, wrapping P\Invoke methods in a class called "NativeMethods" is a convention, so if you're looking for a specific class with that name I suggest looking into any external libraries used with code where you may have seen it referenced (making a guess from how you typed it that this may be the case).