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dllpath.h：源码内容
							/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: dllpath.h,v 1.5.36.3 2004/07/09 01:43:51 hubbe Exp $
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#ifndef _DLL_PATH
#define _DLL_PATH
#include "hxcom.h"
#include "hxmap.h"
#include "hxstring.h"
#ifdef _MACINTOSH                                                           
#pragma export on                                                          
STDAPI SetDLLAccessPath(const char* pPathDescriptor);
#pragma export off 
#endif
#if defined(HELIX_CONFIG_NOSTATICS)
#include "globals/hxglobals.h"
#endif
/*
 *      Used to identify dll types.  
 */
typedef enum dll_types
{
        DLLTYPE_NOT_DEFINED = 0,              // Arbitrary DLLs (no predefined path used)
        DLLTYPE_PLUGIN,                       // Plug-ins
        DLLTYPE_CODEC,                        // Codecs
        DLLTYPE_ENCSDK,                       // Encoder SDK DLLs 
        DLLTYPE_COMMON,                       // Common libraries       
        DLLTYPE_UPDATE,                       // Setup/Upgrade libraries
        DLLTYPE_OBJBROKR,                     // Special entry for the object broker
        DLLTYPE_RCAPLUGIN,                    // Gemini plugins
        DLLTYPE_NUMBER                        // Not a type, used as number of predefined types.
} DLLTYPES;           
typedef HX_RESULT (HXEXPORT_PTR FPSETDLLACCESSPATH) (const char*);
class DLLAccessPath
{
public:
    DLLAccessPath();
    virtual ~DLLAccessPath();
    // This class is only ref-counted if it is used as such. 
    // Most of the system uses this as a non-refcounted class.
    STDMETHOD_(ULONG32,AddRef)  (THIS);
    STDMETHOD_(ULONG32,Release) (THIS);
    HX_RESULT SetAccessPaths(const char* pPathDescriptor);  
    HX_RESULT SetPath(UINT16 nLibType, const char* szPath);
    HX_RESULT SetPath(const char* szLibType, const char* szPath);
    const char* GetPath(UINT16 nLibType);
    const char* GetPath(const char* szLibType);
    const char* GetLibTypeName(UINT16 nLibType);
    HX_RESULT PassDLLAccessPath(FPSETDLLACCESSPATH pSetDLLAccessPath);
    HX_RESULT AddPathToEnvironment(const char* szPath);
    HX_RESULT RestoreEnvironment();
    UINT32 GetNumPaths() {return m_mapPathes.GetCount();}
protected:
    static const char* const zm_pszDllTypeNames[DLLTYPE_NUMBER];
private:
    LONG32               m_lRefCount;
    CHXMapStringToString m_mapPathes;
    CHXString            m_strPathEnvVar;
};
extern DLLAccessPath* GetDLLAccessPath();  
class DLLAccessDestructor
{
public:
    DLLAccessDestructor() {};
    ~DLLAccessDestructor() 
    { 
#ifndef _VXWORKS
        if (GetDLLAccessPath())
        {
            GetDLLAccessPath()->Release(); 
        }
#endif
    }
};
//
// Macros for setting DLL loading paths
//
#ifndef _VXWORKS
#if defined(_STATICALLY_LINKED) && !defined(HELIX_FEATURE_SERVER)
// We need this since many DLLs have this listed
// as an export, so we have to have it defined
#define ENABLE_DLLACCESS_PATHS(GLOBAL)                           
STDAPI ENTRYPOINT(SetDLLAccessPath)(const char* pPathDescriptor) 
{                                                                
    return HXR_OK;                                               
}
#define ENABLE_MULTILOAD_DLLACCESS_PATHS(GLOBAL)                 
STDAPI ENTRYPOINT(SetDLLAccessPath)(const char* pPathDescriptor) 
{                                                                
        return HXR_OK;                                           
}
#elif defined(HELIX_CONFIG_NOSTATICS)
#define ENABLE_DLLACCESS_PATHS(GLOBAL)                                      
    static const DLLAccessPath* const _g_##GLOBAL = NULL;                   
                                                                            
    DLLAccessPath* ENTRYPOINT(GetDLLAccessPath)()                           
    {                                                                       
        return &HXGlobalDLLAccessPath::Get(&_g_##GLOBAL);                    
    }                                                                       
                                                                            
    STDAPI ENTRYPOINT(SetDLLAccessPath)(const char* pPathDescriptor)        
    {                                                                       
        return (GetDLLAccessPath()->SetAccessPaths(pPathDescriptor));       
    }                                                                       
#else /* #if defined(_STATICALLY_LINKED) && !defined(HELIX_FEATURE_SERVER) */
#define ENABLE_DLLACCESS_PATHS(GLOBAL)                                      
    DLLAccessPath GLOBAL;                                                   
                                                                            
    DLLAccessPath* ENTRYPOINT(GetDLLAccessPath)()                           
    {                                                                       
        return &GLOBAL;                                                     
    }                                                                       
                                                                            
    STDAPI ENTRYPOINT(SetDLLAccessPath)(const char* pPathDescriptor)        
    {                                                                       
        return (GetDLLAccessPath()->SetAccessPaths(pPathDescriptor));       
    }                                                                       
#ifdef _UNIX
#define ENABLE_MULTILOAD_DLLACCESS_PATHS(GLOBAL)                            
    DLLAccessPath* GLOBAL = NULL;                                           
                                                                            
    DLLAccessPath* GetDLLAccessPath()                                       
    {                                                                       
        if (!GLOBAL)                                                        
        {                                                                   
            GLOBAL = new DLLAccessPath();                                   
            GLOBAL->AddRef();                                               
        }                                                                   
        return GLOBAL;                                                      
    }                                                                       
                                                                            
    STDAPI ENTRYPOINT(SetDLLAccessPath)(const char* pPathDescriptor)                
    {                                                                       
        if (!GLOBAL)                                                        
        {                                                                   
            GLOBAL = new DLLAccessPath();                                   
            GLOBAL->AddRef();                                               
        }                                                                   
                                                                            
        return (GLOBAL->SetAccessPaths(pPathDescriptor));                   
    }
                                                                            
#else /* #ifdef _UNIX */
#define ENABLE_MULTILOAD_DLLACCESS_PATHS(GLOBAL)                            
    DLLAccessPath* GLOBAL = NULL;                                           
    DLLAccessDestructor GLOBALDestructor;                                   
                                                                            
    DLLAccessPath* GetDLLAccessPath()                                       
    {                                                                       
        if (!GLOBAL)                                                        
        {                                                                   
            GLOBAL = new DLLAccessPath();                                   
            GLOBAL->AddRef();                                               
        }                                                                   
        return GLOBAL;                                                      
    }                                                                       
                                                                            
    STDAPI ENTRYPOINT(SetDLLAccessPath)(const char* pPathDescriptor)                
    {                                                                       
        if (!GLOBAL)                                                        
        {                                                                   
            GLOBAL = new DLLAccessPath();                                   
            GLOBAL->AddRef();                                               
        }                                                                   
                                                                            
        return (GLOBAL->SetAccessPaths(pPathDescriptor));                   
    }                                                                       
#endif /* #ifdef _UNIX #else */
#endif /* #if defined(_STATICALLY_LINKED) #else */
#else /* #ifndef _VXWORKS */
#define ENABLE_DLLACCESS_PATHS(GLOBAL)                                      
    STDAPI ENTRYPOINT(SetDLLAccessPath)(const char* pPathDescriptor)        
    {                                                                       
        return 0;                                                           
    }                                                                       
#ifdef _SERVER
#define ENABLE_MULTILOAD_DLLACCESS_PATHS(GLOBAL)                            
    STDAPI ENTRYPOINT(SetDLLAccessPath)(const char* pPathDescriptor)        
    {                                                                       
        return 0;                                                           
    }                                                                       
#else
#define ENABLE_MULTILOAD_DLLACCESS_PATHS(GLOBAL)                            
    STDAPI ENTRYPOINT(SetDLLAccessPath)(const char* pPathDescriptor)        
    {                                                                       
        return 0;                                                           
    }                                                                       
#endif
#endif /* #ifndef _VXWORKS #else */
#endif /* #ifndef _DLL_PATH */

						