FIX: __declspec(dllimport) Classes Are Not Caught Correctly

MORE INFORMATION

Sample Code

/* dllsamp.cpp : Defines the implementation routines for the DLL
*  Compile options needed: /GX dllsamp.cpp /link /DLL
*/ 

#include <iostream.h>

// ExceptionI is declared with _declspec(dllimport), and will not be
// caught correctly
class __declspec(dllexport) ExceptionI {
   int code;
 public:
   ExceptionI();
   ExceptionI(int i);
   ~ExceptionI() {};
   int GetCode(void);
};

ExceptionI::ExceptionI (void)
{ code = 0; }

ExceptionI::ExceptionI (int i)
{ code = i; }

int ExceptionI::GetCode(void)
{ return code; }

// ExceptionII is derived from ExceptionI, and will be caught correctly
class ExceptionII : public ExceptionI {};

__declspec(dllexport) void dllfunc(void (*exefunc)(void))
{
 try
   {
   cout << "In the DLL." <<endl;
   exefunc();
   }
 catch (ExceptionI x)
   {
   cout << "DLL: Class ExceptionI caught: code = " << x.GetCode() <<
"." << endl;
   cout << "Throwing ExceptionII..." << endl;
   throw ExceptionII();
   }
 catch (...)
   {
   cout << "DLL: ExceptionI was not caught as correct type." << endl;
   cout << "Throwing ExceptionII..." << endl;
   throw ExceptionII();
   }
}

/* exesamp.cpp : Defines the implementation routines for the EXE
*  Compile options needed: /GX exesamp.cpp /link dllsamp.lib
*/ 

#include <iostream.h>

__declspec(dllimport) void dllfunc(void (*exefunc)(void));

class __declspec(dllimport) ExceptionI {
   int code;
 public:
   ExceptionI();
   ExceptionI(int i);
   ~ExceptionI() {};
   int GetCode(void);
};

// ExceptionII needs to be defined in both modules to be caught correctly
class ExceptionII : public ExceptionI {};

void exefunc(void);

void main(void)
{
 try
   {
   cout << "In the EXE." << endl;
   dllfunc(exefunc);
   }
 catch (ExceptionII x)
   {
   cout << "EXE: Class ExceptionII caught: code = " << x.GetCode() <<
"." << endl;
   }
 catch (...)
   {
   cout << "EXE: ExceptionII was not caught as correct type." << endl;
   }
}

void exefunc(void)
{
 try
   {
    cout << "In the EXE again." << endl;
    cout << "Throwing ExceptionI..." << endl;
    throw ExceptionI(-1);
   }
 catch (ExceptionI x)
   {
   cout << "EXE: Class ExceptionI caught: code = " << x.GetCode() <<
"." << endl;
   cout << "Throwing ExceptionI..." << endl;
   throw ExceptionI(-1);
   }
}