7zip/CPP/Windows/DLL.h

// Windows/DLL.h

#ifndef ZIP7_INC_WINDOWS_DLL_H
#define ZIP7_INC_WINDOWS_DLL_H

#include "../Common/MyString.h"

#ifndef _WIN32
typedef void * HMODULE;
// typedef int (*FARPROC)();
// typedef void *FARPROC;
void *GetProcAddress(HMODULE module, LPCSTR procName);
#endif

namespace NWindows {
namespace NDLL {

#ifdef _WIN32

/*
#ifdef UNDER_CE
#define My_GetProcAddress(module, procName) (void *)::GetProcAddressA(module, procName)
#else
#define My_GetProcAddress(module, procName) (void *)::GetProcAddress(module, procName)
#endif
*/

/* Win32: Don't call CLibrary::Free() and FreeLibrary() from another
    FreeLibrary() code: detaching code in DLL entry-point or in
    destructors of global objects in DLL module. */

class CLibrary
{
  HMODULE _module;

  // Z7_CLASS_NO_COPY(CLibrary);
  // copy constructor is required here
public:
  CLibrary(): _module(NULL) {}
  ~CLibrary() { Free(); }

  CLibrary(const CLibrary &c): _module(NULL)
  {
    if (c._module)
    {
      // we need non const to reference from original item
      // c._module = NULL;
      throw 20230102;
    }
  }

  HMODULE Get_HMODULE() const { return _module; }
  // operator HMODULE() const { return _module; }
  // HMODULE* operator&() { return &_module; }
  bool IsLoaded() const { return (_module != NULL); }

  void Attach(HMODULE m)
  {
    Free();
    _module = m;
  }
  HMODULE Detach()
  {
    const HMODULE m = _module;
    _module = NULL;
    return m;
  }

  bool Free() throw();
  bool LoadEx(CFSTR path, DWORD flags = LOAD_LIBRARY_AS_DATAFILE) throw();
  bool Load(CFSTR path) throw();
  // FARPROC
  // void *GetProc(LPCSTR procName) const { return My_GetProcAddress(_module, procName); }
};

#else

class CLibrary
{
  HMODULE _module;

  // Z7_CLASS_NO_COPY(CLibrary);
public:
  CLibrary(): _module(NULL) {}
  ~CLibrary() { Free(); }

  HMODULE Get_HMODULE() const { return _module; }

  bool Free() throw();
  bool Load(CFSTR path) throw();
  // FARPROC
  // void *GetProc(LPCSTR procName) const; // { return My_GetProcAddress(_module, procName); }
};

#endif

bool MyGetModuleFileName(FString &path);

FString GetModuleDirPrefix();

}}

#endif