windows/SysLibrary.cpp

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/******************************************************************************/
/* REXX Shared runtime                                                        */
/*                                                                            */
/* Windows implementation of the SysLibrary                                   */
/*                                                                            */
/******************************************************************************/
 
#include "SysLibrary.hpp"
 
SysLibrary::SysLibrary()
{
    libraryHandle = NULL;
}
 
 
void *SysLibrary::getProcedure(
  const char *name)                      /* required procedure name           */
/******************************************************************************/
/* Function:  Resolve a named procedure in a library                          */
/******************************************************************************/
{
  return (void *)GetProcAddress(libraryHandle, name);
}
 
 
/**
 * Load a named library in this process.
 *
 * @param name   Character string name of the library.
 *
 * @return True if able to load the library ok, false otherwise.
 */
bool SysLibrary::load(const char *name)
{
    if (libraryHandle == NULL)
    {
        // we always use LoadLibrary to load this, to bump the reference count on
        // the module if it is already loaded in this process.
        libraryHandle = LoadLibrary((LPCTSTR)name);
        // and return the success/failure indicator
        return libraryHandle != NULL;
 
    }
    return true;
}
 
/**
 * Free a loaded library if the library is still loaded.
 *
 * @return True if we unloaded ok, false otherwise.
 */
bool SysLibrary::unload()
{
    if (libraryHandle != NULL)
    {
        return FreeLibrary(libraryHandle) != FALSE;
    }
    return false;
}