用宏定义封装LoadLibrary，方便的动态加载dll

同学们动态加载dll的时候是不是感觉挺麻烦的，每次都::LoadLibrary，::GetProcAddress，还要typedef一堆函数。最近闲来无聊，用宏封装了一下，可以少写不少代码，用来也挺方便的。

不过最多支持5个参数，同学们可以自己加。等着下次用flexbison写一个生成工具，我感觉还是不错的。

#pragma once
/*! rief 动态加载dll，并调用导出函数
author:12178761@qq.com
*/
#define DLLLOADER_BEGIN( NAME)
class DLLLOADER_##NAME
{
public:
    static BOOL Init( LPCWSTR sDllPath){
    if ( RefHModule())
        {
        return TRUE;
        }
        RefHModule() = ::LoadLibrary( sDllPath);
        if ( !RefHModule())
        {
        return FALSE;
        }
        return TRUE;
    }
    static void UnInit(){
    if ( RefHModule())
        {
        FreeLibrary( RefHModule());
        RefHModule() = NULL;
        }
    }
    static HMODULE& RefHModule(){
    static HMODULE M = NULL;
    return M;
    }
#define DLLLOADER_ENTRY_0( FUNNAME, FUNDESC, FUNRET, FUNRETDEF)
    typedef FUNRET (FUNDESC *_##FUNNAME)();
    static _##FUNNAME Ref##FUNNAME(){
    _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);
    return F;
    }
    static FUNRET FUNNAME(){
    if ( Ref##FUNNAME())
        {
        return Ref##FUNNAME()();
        }
        return FUNRETDEF;
    }
#define DLLLOADER_ENTRY_VOID0( FUNNAME, FUNDESC)
    typedef void (FUNDESC *_##FUNNAME)();
    static _##FUNNAME Ref##FUNNAME(){
    _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);
    return F;
    }
    static void FUNNAME(){
    if ( Ref##FUNNAME())
        {
        Ref##FUNNAME()();
        }
    }
#define DLLLOADER_ENTRY_1( FUNNAME, FUNDESC, FUNRET, FUNRETDEF, PARAMTYPE1)
    typedef FUNRET (FUNDESC *_##FUNNAME)(PARAMTYPE1);
    static _##FUNNAME Ref##FUNNAME(){
    _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);
    return F;
    }
    static FUNRET FUNNAME( PARAMTYPE1 PARAM1){
    if ( Ref##FUNNAME())
        {
        return Ref##FUNNAME()( PARAM1);
        }
        return FUNRETDEF;
    }
#define DLLLOADER_ENTRY_VOID1( FUNNAME, FUNDESC, PARAMTYPE1)
    typedef void (FUNDESC *_##FUNNAME)(PARAMTYPE1);
    static _##FUNNAME Ref##FUNNAME(){
    _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);
    return F;
    }
    static void FUNNAME( PARAMTYPE1 PARAM1){
    if ( Ref##FUNNAME())
        {
        Ref##FUNNAME()( PARAM1);
        }
    }
#define DLLLOADER_ENTRY_2( FUNNAME, FUNDESC, FUNRET, FUNRETDEF, PARAMTYPE1, PARAMTYPE2)
    typedef FUNRET (FUNDESC *_##FUNNAME)(PARAMTYPE1, PARAMTYPE2);
    static _##FUNNAME Ref##FUNNAME(){
    _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);
    return F;
    }
    static FUNRET FUNNAME( PARAMTYPE1 PARAM1, PARAMTYPE2 PARAM2){
    if ( Ref##FUNNAME())
        {
        return Ref##FUNNAME()( PARAM1, PARAM2);
        }
        return FUNRETDEF;
    }
#define DLLLOADER_ENTRY_VOID2( FUNNAME, FUNDESC, PARAMTYPE1, PARAMTYPE2)
    typedef void (FUNDESC *_##FUNNAME)(PARAMTYPE1, PARAMTYPE2);
    static _##FUNNAME Ref##FUNNAME(){
    _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);
    return F;
    }
    static void FUNNAME( PARAMTYPE1 PARAM1, PARAMTYPE2 PARAM2){
    if ( Ref##FUNNAME())
        {
        Ref##FUNNAME()( PARAM1, PARAM2);
        }
    }
#define DLLLOADER_ENTRY_3( FUNNAME, FUNDESC, FUNRET, FUNRETDEF, PARAMTYPE1, PARAMTYPE2, PARAMTYPE3)
    typedef FUNRET (FUNDESC *_##FUNNAME)(PARAMTYPE1, PARAMTYPE2, PARAMTYPE3);
    static _##FUNNAME Ref##FUNNAME(){
    _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);
    return F;
    }
    static FUNRET FUNNAME( PARAMTYPE1 PARAM1, PARAMTYPE2 PARAM2, PARAMTYPE3 PARAM3){
    if ( Ref##FUNNAME())
        {
        return Ref##FUNNAME()( PARAM1, PARAM2, PARAM3);
        }
        return FUNRETDEF;
    }
#define DLLLOADER_ENTRY_VOID3( FUNNAME, FUNDESC, PARAMTYPE1, PARAMTYPE2, PARAMTYPE3)
    typedef void (FUNDESC *_##FUNNAME)(PARAMTYPE1, PARAMTYPE2, PARAMTYPE3);
    static _##FUNNAME Ref##FUNNAME(){
    _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);
    return F;
    }
    static void FUNNAME( PARAMTYPE1 PARAM1, PARAMTYPE2 PARAM2, PARAMTYPE3 PARAM3){
    if ( Ref##FUNNAME())
        {
        Ref##FUNNAME()( PARAM1, PARAM2, PARAM3);
        }
    }
#define DLLLOADER_ENTRY_4( FUNNAME, FUNDESC, FUNRET, FUNRETDEF, PARAMTYPE1,
PARAMTYPE2, PARAMTYPE3, PARAMTYPE4)
    typedef FUNRET (FUNDESC *_##FUNNAME)(PARAMTYPE1, PARAMTYPE2, PARAMTYPE3, PARAMTYPE4);
    static _##FUNNAME Ref##FUNNAME(){
    _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);
    return F;
    }
    static FUNRET FUNNAME( PARAMTYPE1 PARAM1, PARAMTYPE2 PARAM2, PARAMTYPE3 PARAM3, PARAMTYPE4 PARAM4){
    if ( Ref##FUNNAME())
        {
        return Ref##FUNNAME()( PARAM1, PARAM2, PARAM3, PARAM4);
        }
        return FUNRETDEF;
    }
#define DLLLOADER_ENTRY_VOID4( FUNNAME, FUNDESC, PARAMTYPE1,
PARAMTYPE2, PARAMTYPE3, PARAMTYPE4)
    typedef void (FUNDESC *_##FUNNAME)(PARAMTYPE1, PARAMTYPE2, PARAMTYPE3, PARAMTYPE4);
    static _##FUNNAME Ref##FUNNAME(){
    _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);
    return F;
    }
    static void FUNNAME( PARAMTYPE1 PARAM1, PARAMTYPE2 PARAM2, PARAMTYPE3 PARAM3, PARAMTYPE4 PARAM4){
    if ( Ref##FUNNAME())
        {
        Ref##FUNNAME()( PARAM1, PARAM2, PARAM3, PARAM4);
        }
    }
#define DLLLOADER_ENTRY_5( FUNNAME, FUNDESC, FUNRET, FUNRETDEF, PARAMTYPE1,
    PARAMTYPE2, PARAMTYPE3, PARAMTYPE4, PARAMTYPE5)
    typedef FUNRET (FUNDESC *_##FUNNAME)(PARAMTYPE1, 
    PARAMTYPE2, PARAMTYPE3, PARAMTYPE4, PARAMTYPE5);
    static _##FUNNAME Ref##FUNNAME(){
    _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);
    return F;
    }
    static FUNRET FUNNAME( PARAMTYPE1 PARAM1, PARAMTYPE2 PARAM2, 
    PARAMTYPE3 PARAM3, PARAMTYPE4 PARAM4, PARAMTYPE5 PARAM5){
    if ( Ref##FUNNAME())
        {
        return Ref##FUNNAME()( PARAM1, PARAM2, PARAM3, PARAM4, PARAM5);
        }
        return FUNRETDEF;
    }
#define DLLLOADER_ENTRY_VOID5( FUNNAME, FUNDESC, PARAMTYPE1,
    PARAMTYPE2, PARAMTYPE3, PARAMTYPE4, PARAMTYPE5)
    typedef void (FUNDESC *_##FUNNAME)(PARAMTYPE1, 
    PARAMTYPE2, PARAMTYPE3, PARAMTYPE4, PARAMTYPE5);
    static _##FUNNAME Ref##FUNNAME(){
    _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);
    return F;
    }
    static void FUNNAME( PARAMTYPE1 PARAM1, PARAMTYPE2 PARAM2, 
    PARAMTYPE3 PARAM3, PARAMTYPE4 PARAM4, PARAMTYPE5 PARAM5){
    if ( Ref##FUNNAME())
        {
        Ref##FUNNAME()( PARAM1, PARAM2, PARAM3, PARAM4, PARAM5);
        }
    }
#define DLLLOADER_END()
};

/*
例子：
DLLLOADER_BEGIN( SAMPLE)
DLLLOADER_ENTRY_0( Function1, BOOL, FALSE, )
DLLLOADER_ENTRY_VOID0( Function2, )
DLLLOADER_ENTRY_1( Function3, BOOL, FALSE, , LPCWSTR)
DLLLOADER_END()

DLLLOADER_BEGIN(KERNEL32)
DLLLOADER_ENTRY_1( LoadLibraryW, WINAPI, HMODULE, 0, LPCWSTR)
DLLLOADER_ENTRY_3( GetModuleFileNameW, WINAPI, DWORD, 0, HMODULE, LPWSTR, DWORD)
DLLLOADER_END()

int _tmain(int argc, _TCHAR* argv[])
{
    DLLLOADER_SAMPLE::Init( L"C:\Users\sosopop\Documents\Visual Studio 2005\Projects\testHandle\debug\testLoadDll.dll");
    DLLLOADER_SAMPLE::Function1();
    DLLLOADER_SAMPLE::Function2();
    DLLLOADER_SAMPLE::Function3(L"Function3 Hello");
    DLLLOADER_SAMPLE::Function4(L"Function4", L"Hello");
    DLLLOADER_SAMPLE::UnInit();

    DLLLOADER_KERNEL32::Init( L"c:\windows\system32\kernel32.dll");
    HMODULE h =DLLLOADER_KERNEL32::LoadLibraryW( L"user32.dll");
    WCHAR sFileName[MAX_PATH]={0};
    DWORD nSize = DLLLOADER_KERNEL32::GetModuleFileNameW( NULL, sFileName, _countof(sFileName));

    return 0;
}
*/