Help converting to C++

[AA2e72E]

I have two lines of basic C# code

System.IO.Directory.CreateDirectory(path);
return System.IO.Directory.Exists(path);

I want to bury this in a C++ Win32 Project. My effort so far (that does not
work and I do not understand the error messages) is:

#using <mscorlib.dll>

using namespace System;
using namespace System::IO;

bool* _clrcall;bool CDirectory(String path)
{
DirectoryInfo d = Directory::CreateDirectory(path);
return (d.Exists(path));
}

I get

Error 3 error C3149: 'System::String' : cannot use this type here without a
top-level '^'
Error 4 error C2664:
'System::IO:irectoryInfo:irectoryInfo(System::String ^)' : cannot convert
parameter 1 from 'System::IO:irectoryInfo ^' to 'System::String ^'
Error 5 error C2064: term does not evaluate to a function taking 1 arguments


I would be grateful for some guidance/clues; thanks.

 

[Jochen Kalmbach [MVP]]

bool CDirectory(String^ path)
{
DirectoryInfo^ d = Directory::CreateDirectory(path);
return (d->Exists(path));
}

--
Greetings
Jochen

My blog about Win32 and .NET
http://blog.kalmbachnet.de/

 

[AA2e72E]

Thank you; I'd be grateful for some more help.

1. Why is this always (even when the path exists) returning false:

_declspec (dllexport) bool _stdcall CDirectory(char path)
{
//DirectoryInfo d = Directory::CreateDirectory(path,"R");
if (Directory::Exists(path.ToString()))
{
return true;
}
else
{
return false;
}
}

2. What do ^ and * do?

3. Do I need to #include ? for String^ path to compile?

Thanks for your patience.

 

[Jochen Kalmbach [MVP]]

Hi AA2e72E!

_declspec (dllexport) bool _stdcall CDirectory(char path)

You are passing *one* character!

2. What do ^ and * do?

^is a reference object.
* is a pointer.

3. Do I need to #include ? for String^ path to compile?

No. You need to add a reference to mscorlib.dll and add
using namespace System;


May I ask you a question?
WHY are you using C++/CLI? Why not use C#?


--
Greetings
Jochen

My blog about Win32 and .NET
http://blog.kalmbachnet.de/

 

[Carl Daniel [VC++ MVP]]

I want to bury this in a C++ Win32 Project. My effort so far (that does
not
work and I do not understand the error messages) is:

#using <mscorlib.dll>

using namespace System;
using namespace System::IO;

bool* _clrcall;bool CDirectory(String path)
{
DirectoryInfo d = Directory::CreateDirectory(path);
return (d.Exists(path));
}

This is NOT C++ Win32 code. This is C++/CLI code that still depends on the
CLR at runtime. If your aim was to not depend on the CLR, you'll need a
different solution.

-cd

 

[AA2e72E]

My VS2008 project is C++ Win32 Project; I understand that if I use _stdcall e.g

_declspec (dllexport) char* _stdcall to_upper(char *lowerstring)

I can use C++/CLI code within the body of the function. This allows the DLL
to be used by native i.e. unmanaged code clients.

It was not my intention to avoid the CLR.