win32_dll.cpp

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

/* ***** BEGIN LICENSE BLOCK ***** 
 * Version: RCSL 1.0/RPSL 1.0 
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 * the file under the RealNetworks Community Source License Version 1.0 
 * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl, 
 * in which case the RCSL will apply. You may also obtain the license terms 
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 * applicable to this file, the RCSL.  Please see the applicable RPSL or 
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 * This file is part of the Helix DNA Technology. RealNetworks is the 
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 * ***** END LICENSE BLOCK ***** */ 

#include "dllacces.h"

#include "hlxclib/windows.h"

#include "hxassert.h"

#if !defined _DEBUG && (defined WIN32 || defined _WINDOWS) && !defined(WIN32_PLATFORM_PSPC)
#define AVOID_LOADLIBRARY_FAILURE
#endif

static const char ErrLoadFailed[] = "Unable to load library";
static const char ErrSymbolNotFound[] = "Symbol not found";

class Win32DLLAccess : public DLLAccessImp
{
public:
    Win32DLLAccess();
    virtual ~Win32DLLAccess();
    virtual int Open(const char* dllName);
    virtual int Close() ;
    virtual void* GetSymbol(const char* symbolName);
    virtual const char* GetErrorStr() const;
    virtual char* CreateVersionStr(const char* dllName) const;
    virtual void CreateName(const char* short_name, const char* long_name, char* out_buf,
		      UINT32& out_buf_len, UINT32 nMajor, UINT32 nMinor);

private:
    HINSTANCE m_handle;
    const char* m_pErrorStr;
};

Win32DLLAccess::Win32DLLAccess() : 
    m_handle(0)
{}

Win32DLLAccess::~Win32DLLAccess()
{
    if (m_handle)
    {
	Close();
    }
}

int Win32DLLAccess::Open(const char* dllName)
{
    int ret = DLLAccess::NO_LOAD;

    if (m_handle)
    {
	Close();
    }

#ifdef AVOID_LOADLIBRARY_FAILURE
    UINT nOldMode = ::SetErrorMode(SEM_FAILCRITICALERRORS);
#endif /* AVOID_LOADLIBRARY_FAILURE */

    m_handle = LoadLibrary(OS_STRING(dllName));

#ifdef AVOID_LOADLIBRARY_FAILURE
    ::SetErrorMode(nOldMode);
#endif /* AVOID_LOADLIBRARY_FAILURE */

    if (m_handle)
    {
	ret = DLLAccess::DLL_OK;
    }
    else
    {
	m_pErrorStr = ErrLoadFailed;
    }

#if defined _FLIGHTRECORDING && defined _WIN32
    if (m_handle)
    {
        FlightRecorderPassContextToDll(m_handle);
    }
#endif    

    return ret;
}

int Win32DLLAccess::Close()
{
#if defined(_DEBUG)
    // if debug build, don't free library if "HXMemoryLeak" is enabled.
    // set  \\HKEY_CLASSES_ROOT\HXMemoryLeak  to "1" for mem leak debugging
    if (::HXDebugOptionEnabled("HXMemoryLeak")==FALSE)
	FreeLibrary(m_handle);
#else
    FreeLibrary(m_handle);
#endif

    m_handle = 0;

    return DLLAccess::DLL_OK;
}

void* Win32DLLAccess::GetSymbol(const char* symbolName)
{
    void* ret = GetProcAddress(m_handle, OS_STRING(symbolName));

    if (!ret)
    {
	m_pErrorStr = ErrSymbolNotFound;
    }

    return ret;
}

const char* Win32DLLAccess::GetErrorStr() const
{
    return m_pErrorStr;
}

char* Win32DLLAccess::CreateVersionStr(const char* dllName) const
{
    return 0;
}
    
void
Win32DLLAccess::CreateName(const char* short_name, const char* long_name, char* out_buf,
		      UINT32& out_buf_len, UINT32 nMajor, UINT32 nMinor)
{
    UINT32  long_name_len;

    out_buf[0] = 0;

    long_name_len = strlen(long_name);

    if (long_name_len + DLLAccess::EXTRA_BUF_LEN > out_buf_len)
    {
	ASSERT(0);
	out_buf_len = 0;
	return;
    }

    out_buf_len = sprintf(out_buf, "%s.dll", long_name); /* Flawfinder: ignore */
}


DLLAccessImp* DLLAccess::CreatePlatformDLLImp()
{
    return new Win32DLLAccess();
}