C / C++ / MFC

<br />
WIN32DLL02_API BSTR fnWin32DLL02(LPCSTR s)<br />
{<br />
		BSTR x;<br />
<br />
		x = SysAllocString(L"abcde");<br />
<br />
	 	MessageBox(NULL,s,"Info",MB_OK);<br />
<br />
<br />
		return x;<br />
}<br />

CrocodileBuck wrote:

x = SysAllocString(L"abcde");

char * psz = "abcde";
x = SysAllocStringLen(psz, strlen(psz));

Nemanja Trifunovic wrote:

You can use BSTR only if you have a COM dll, which you obviously don't. So, try returning good ol char* instead.

Rajesh R Subramanian wrote:

I've returned BSTR from a regular dll for some reason and I think it worked.

typedef WCHAR  OLECHAR;
typedef OLECHAR FAR * BSTR;

#if !defined(_NATIVE_WCHAR_T_DEFINED)
  typedef unsigned short WCHAR;
#else
  typedef wchar_t WCHAR;
#endif

<br />
Option Explicit<br />
<br />
Private Declare Function fnWin32DLL02 Lib "E:\WORKING\OMRON\GDT\EigeneDLL\Übergabe eines Strings aus C++ Dll\Win32DLL02.dll" () As String<br />
<br />
Private Sub Form_Load()<br />
    <br />
    Dim x As String<br />
    <br />
    x = Space$(3)<br />
    x = fnWin32DLL02()<br />
    MsgBox "X ist: " & x<br />
    <br />
End Sub<br />

<br />
WIN32DLL02_API LPCSTR fnWin32DLL02(void)<br />
{<br />
		LPCSTR s;<br />
		s = "abc";<br />
	//  s = SysAllocString(L"abc");<br />
	  // 	SysFreeString(s);<br />
		return s;<br />
}<br />

messages wrote:

abour device driver what is it

messages wrote:

I have VS2005 does it perfect for make it?

// some.h
class Object
{
public:
  Object() { }
  type Test() { }
};
// some.cpp
static Object obj;
// other.h
#include "some.h"
extern static Object obj;
class Invoker
{
public:
  type UseStaticObj() { return ::obj.Test(); }
};

f = getc(); //Why is this dangling around? Put this inside a function.

e(); //huh? You should derive b from a first or create an object of a then call a.e();