Dllimport, extern functionality

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Hi. In C# you have Dllimport and extern going together to import a specific function from a specific DLL. I want to know how to implement their functionalities in C++ if it's possible. Thanks in advance.

E.g. in C#:
[DllImport("setupapi.dll" , CharSet = CharSet::Seeifdef, EntryPoint="SetupDiGetClassDevs")]
extern "C" HDEVINFO SetupDiGetClassDevsUM(
LPGUID ClassGuid,
PCTSTR Enumerator,
HWND hwndParent,
DWORD Flags);

To C++:?

Posted 6-Feb-13 22:12pm

YourAverageCoder

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Matthew Faithfull · Accepted Answer · 2013-02-06T22:59:00

It is a little different in C++.

extern "C"
{
__declspec( dllimport ) HDEVINFO SetupDiGetClassDevsUM( LPGUID ClassGuid, PCTSTR Enumerator, HWND hwndParent, DWORD Flags );
}

but not that different.
I don't know about C# but in C++ you'll also need to link to the DLL that exports this function, by adding its import library to the linker input list in Visual Studio or some thing like #pragma comment(lib,"SetupAPI.lib")

Richard MacCutchan · Accepted Answer · 2013-02-06T23:37:00

Solution 2

Most Windows libraries already provide standard C interfaces which are defined in their associated header files. Just check the MSDN documentation[^] for the API call you are interested in, and it will give you the details of the call, parameters, .h and .lib files needed to make use of it.

Posted 6-Feb-13 23:37pm

Richard MacCutchan