PInvoke or DllImport

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I'm a NET newby.
Does anyone understand what happens behind the scenes when using PInvoke in NET?I'm curious as to how the CLR finds the win32 function and how it consumes it.What I'm asking is, does it go to the WIN32 folder and copy the function (or reflect over it) and then use it?What if I'm using win95 or LINUX, does it check the OS type?

[DllImport("user32.dll")]
private static extern int MessageBox( int i,string text, string caption, uint type);

Thanks in advance
Johan

Posted 22-Oct-10 8:00am

jc mahne

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Toli Cuturicu 22-Oct-10 14:21pm

What will you do with the answer? How will you use it?

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Nish Nishant · Accepted Answer · 2010-10-22T08:11:00

The CLR knows how to specially handle external calls. In this case the external method is invoked the standard way - which is by using LoadLibrary/GetProcAddress. Of course there are details like the plumbing code required to marshal managed types to native types before the call, and then to convert back after the call.