DLL Loader

//DLL.h
#pragma once

#include <Windows.h>
#include <tchar.h>

//ttsmf0.dllの関数ポインタ
struct ttsmf0Function
{
    HMODULE ttsmfDLL; //DLLのモジュールハンドル

    HANDLE (__stdcall *CreateSmfFunc)(short Timebase);
    BOOL (__stdcall *DeleteSmfFunc)(HANDLE hSmf);
    HANDLE (__stdcall *CopySmfFunc)(HANDLE hSmf);
    BOOL (__stdcall *SaveSmfFunc)(HANDLE hSmf, char *lpszFileName, DWORD fdwCreate, DWORD fdwAttrsAndFlags);
    BOOL (__stdcall *GetSmfDataSizeFunc)(HANDLE hSmf, LPDWORD pDestSize);
    BOOL (__stdcall *GetSmfDataFunc)(HANDLE hSmf, LPBYTE pDest, DWORD DestSize);
    BOOL (__stdcall *CopyToClipboardFunc)(HANDLE hSmf);
    BOOL (__stdcall *InsertMidiEventFunc)(HANDLE hSmf, DWORD Tick, BYTE *pData, int DataSize);
    BOOL (__stdcall *InsertSysexEventFunc)(HANDLE hSmf, DWORD Tick, BYTE *pData, int DataSize);
    BOOL (__stdcall *InsertMetaEventFunc)(HANDLE hSmf, DWORD Tick, BYTE MetaType, BYTE *pData, int DataSize);
    BOOL (__stdcall *cal_insert_NoteFunc)(HANDLE hSmf, DWORD Tick, LONG MidiChannel, LONG Key, LONG Velocity, DWORD Duration);
    BOOL (__stdcall *cal_insert_KeyAftFunc)(HANDLE hSmf, DWORD Tick, LONG MidiChannel, LONG Key, LONG Amount);
    BOOL (__stdcall *cal_insert_ControlFunc)(HANDLE hSmf, DWORD Tick, LONG MidiChannel, LONG ControlNumber, LONG Value);
    BOOL (__stdcall *cal_insert_ChanAftFunc)(HANDLE hSmf, DWORD Tick, LONG MidiChannel, LONG Amount);
    BOOL (__stdcall *cal_insert_PatchFunc)(HANDLE hSmf, DWORD Tick, LONG MidiChannel, LONG PatchNumber, LONG BankNumber);
    BOOL (__stdcall *cal_insert_WheelFunc)(HANDLE hSmf, DWORD Tick, LONG MidiChannel, LONG Value);
    BOOL (__stdcall *calex_insert_RPNFunc)(HANDLE hSmf, DWORD Tick, LONG MidiChannel, LONG Number, LONG Value);
    BOOL (__stdcall *calex_insert_NRPNFunc)(HANDLE hSmf, DWORD Tick, LONG MidiChannel, LONG Number, LONG Value);
    BOOL (__stdcall *calex_insert_SysxFunc)(HANDLE hSmf, DWORD Tick, char *lpszSysx);
    BOOL (__stdcall *calex_insert_TextFunc)(HANDLE hSmf, DWORD Tick, char *lpszText);
    BOOL (__stdcall *calex_insert_LyricFunc)(HANDLE hSmf, DWORD Tick, char *lpszLyric);
};

extern ttsmf0Function ttsmf0;

BOOL LoadttSmf0DLL();
BOOL ReleasettSmf0DLL();

//Dll.cpp
#include "Dll.h"

ttsmf0Function ttsmf0;

//ttsmf0.dllをロードする関数
BOOL LoadttSmf0DLL()
{
    //ttsmf0.dllをロードする
    if (ttsmf0.ttsmfDLL == NULL)
    {
        ttsmf0.ttsmfDLL = LoadLibrary(_T("ttsmf0.dll"));
        //ttsmf0.dllの関数ポインタを設定する
        ttsmf0.CreateSmfFunc = (HANDLE(__stdcall *)(short))GetProcAddress(ttsmf0.ttsmfDLL, "CreateSmf");
        ttsmf0.DeleteSmfFunc = (BOOL(_stdcall *)(HANDLE))GetProcAddress(ttsmf0.ttsmfDLL, "DeleteAdmf");
        ttsmf0.CopySmfFunc = (HANDLE(__stdcall*)(HANDLE))GetProcAddress(ttsmf0.ttsmfDLL, "CopySmf");
        ttsmf0.SaveSmfFunc = (BOOL(__stdcall*)(HANDLE, char *, DWORD, DWORD))GetProcAddress(ttsmf0.ttsmfDLL, "SaveSmf");
        ttsmf0.GetSmfDataSizeFunc = (BOOL(__stdcall*)(HANDLE, LPDWORD))GetProcAddress(ttsmf0.ttsmfDLL, "GetSmfDataSize");
        ttsmf0.GetSmfDataFunc = (BOOL(__stdcall*)(HANDLE, LPBYTE, DWORD))GetProcAddress(ttsmf0.ttsmfDLL, "GetSmfData");
        ttsmf0.CopyToClipboardFunc = (BOOL(__stdcall*)(HANDLE))GetProcAddress(ttsmf0.ttsmfDLL, "CopyToClipboard");
        ttsmf0.InsertMidiEventFunc = (BOOL(__stdcall*)(HANDLE, DWORD, BYTE*, int))GetProcAddress(ttsmf0.ttsmfDLL, "InsertMidiEvent");
        ttsmf0.InsertMetaEventFunc = (BOOL(__stdcall *)(HANDLE, DWORD, BYTE, BYTE *, int))GetProcAddress(ttsmf0.ttsmfDLL, "InsertMetaEvent");
        ttsmf0.cal_insert_NoteFunc = (BOOL(__stdcall *)(HANDLE, DWORD, LONG, LONG, LONG, DWORD))GetProcAddress(ttsmf0.ttsmfDLL, "cal_insert_Note");
        ttsmf0.cal_insert_KeyAftFunc = (BOOL(__stdcall *)(HANDLE, DWORD, LONG, LONG, LONG))GetProcAddress(ttsmf0.ttsmfDLL, "cal_insert_KeyAft");
        ttsmf0.cal_insert_ControlFunc = (BOOL(__stdcall *)(HANDLE, DWORD, LONG, LONG, LONG))GetProcAddress(ttsmf0.ttsmfDLL, "cal_insert_Control");
        ttsmf0.cal_insert_ChanAftFunc = (BOOL(__stdcall *)(HANDLE, DWORD, LONG, LONG))GetProcAddress(ttsmf0.ttsmfDLL, "cal_insert_ChanAft");
        ttsmf0.cal_insert_PatchFunc = (BOOL(__stdcall *)(HANDLE, DWORD, LONG, LONG, LONG))GetProcAddress(ttsmf0.ttsmfDLL, "cal_insert_Patch");
        ttsmf0.cal_insert_WheelFunc = (BOOL(__stdcall *)(HANDLE, DWORD, LONG, LONG))GetProcAddress(ttsmf0.ttsmfDLL, "cal_insert_Wheel");
        ttsmf0.calex_insert_RPNFunc = (BOOL(__stdcall *)(HANDLE, DWORD, LONG, LONG, LONG))GetProcAddress(ttsmf0.ttsmfDLL, "calex_insert_RPN");
        ttsmf0.calex_insert_NRPNFunc = (BOOL(__stdcall *)(HANDLE, DWORD, LONG, LONG, LONG))GetProcAddress(ttsmf0.ttsmfDLL, "calex_insert_NRPN");
        ttsmf0.calex_insert_SysxFunc = (BOOL(__stdcall *)(HANDLE, DWORD, char *))GetProcAddress(ttsmf0.ttsmfDLL, "calex_insert_Sysx");
        ttsmf0.calex_insert_TextFunc = (BOOL(__stdcall *)(HANDLE, DWORD, char *))GetProcAddress(ttsmf0.ttsmfDLL, "calex_insert_Text");
        ttsmf0.calex_insert_LyricFunc = (BOOL(__stdcall *)(HANDLE, DWORD, char *))GetProcAddress(ttsmf0.ttsmfDLL, "calex_insert_Lyric");

    }
    else //ロードできていなければFALSEを返す
    {
        return FALSE;
    }
    //ロードができていてかつ関数ポインタを設定しているならTRUEを返す
    return TRUE;
}

//ttsmf0.dllをアンロードする関数
BOOL ReleasettSmf0DLL()
{
    //DLLのハンドルが存在していたら
    if (ttsmf0.ttsmfDLL)
    {
        FreeLibrary(ttsmf0.ttsmfDLL);
        ttsmf0.ttsmfDLL = NULL;
    }

    return TRUE;
}