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DllImport in C++Express2005?

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BeanDog (VIP)

I've never used DllImport in C++ before. I'm attemping to import the Windows
FindWindow function into my Visual C++ Express project like so:

using namespace System::Runtime::InteropServices;

public class Win32
    {
        [DllImport("User32.dll")];
        public:
            extern static int FindWindow(String ^lpClassName,String ^lpWindowName);
    };

This produces numerous compile errors:
Form1.h(22) : error 3750:
'System::Runtime::InteropServices::DllImportAttribute': a custom attribute
may not be used in an anonymous attribute block unless it is scoped for
assembly or module
Form1.h(22) : error 3303:
'System::Runtime::InteropServices::DllImportAttribute': attribute can only be
used on 'methods'
Form1.h(24) : error C2159: more than one storage class specified
Form1.h(24) : error C2720: 'svchost::Win32::FindWindow' : 'extern'
storage-class specifier illegal on members

What am I missing?

~BenDilts( void );

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Doug Harrison [MVP] (VIP)

BeanDog wrote:

[Original message clipped]

DllImport is an attribute and must be attached to the thing it modifies,
e.g.

[DllImport("User32.dll")]
static int FindWindow(String ^lpClassName, String ^lpWindowName);

See this MSDN topic for more:

Using the DllImport Attribute
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore/html/vcwlkSysimportAttributeTutorial.asp

Also, it's illegal to declare something both static and extern, and it's
illegal to use extern on class members. As a class member, your FindWindow
must be declared static.

--
Doug Harrison
Microsoft MVP - Visual C++

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System.Runtime.InteropServices.DllImportAttribute

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