#include<windows.h>

// winmm.lib をリンクする
#pragma comment(lib,"winmm")

#define BUFFERSIZE	256

LRESULT CALLBACK WindowProc(HWND hWnd,UINT uMsg,WPARAM wParam,LPARAM lParam)
{
	static MCI_OPEN_PARMS mop;
	MCI_SEEK_PARMS seek;
	static DWORD ms=0;
	MCIERROR mciErr;
	TCHAR str[BUFFERSIZE];

	switch(uMsg){
		case WM_CREATE:		//オープン
			mop.dwCallback=(DWORD)hWnd;
			mop.lpstrDeviceType="WaveAudio";
			mop.lpstrElementName="Windows XP Startup.wav";
			mciSendCommand(NULL,MCI_OPEN,
				MCI_NOTIFY | MCI_OPEN_TYPE | MCI_OPEN_ELEMENT,(DWORD)&mop);
			return 0;
		case MM_MCINOTIFY:	//再生
			mciErr=mciSendCommand((MCIDEVICEID)lParam,MCI_PLAY,0,0);
			if(mciErr){
                mciGetErrorString(mciErr,str,BUFFERSIZE);
				MessageBox(hWnd,str,"PLAY",MB_OK);
			}
			return 0;
		case WM_LBUTTONDOWN:	//シーク(後退)
			seek.dwCallback=(DWORD)hWnd;
			seek.dwTo=(ms-=500);	//ミリ秒単位
			mciErr=mciSendCommand(mop.wDeviceID,MCI_SEEK,MCI_NOTIFY | MCI_TO,(DWORD)&seek);
			if(mciErr){
                mciGetErrorString(mciErr,str,BUFFERSIZE);
				MessageBox(hWnd,str,"後退",MB_OK);
			}
			return 0;
		case WM_RBUTTONDOWN:	//シーク(前進)
			seek.dwCallback=(DWORD)hWnd;
			seek.dwTo=2000;//(ms+=500);	//ミリ秒単位
			mciErr=mciSendCommand(mop.wDeviceID,MCI_SEEK,MCI_NOTIFY | MCI_TO,(DWORD)&seek);
			if(mciErr){
                mciGetErrorString(mciErr,str,BUFFERSIZE);
				MessageBox(hWnd,str,"前進",MB_OK);
			}
			return 0;
		case WM_DESTROY:	//クローズ
			mciSendCommand(mop.wDeviceID,MCI_CLOSE,0,0);
			PostQuitMessage(0);
			return 0;
	}
	return DefWindowProc(hWnd,uMsg,wParam,lParam);
}

int WINAPI WinMain(
	HINSTANCE hInstance,HINSTANCE hPrevInstance,PSTR lpCmdLine,int nCmdShow)
{
	WNDCLASS wc;
	MSG msg;

	wc.style		 = CS_HREDRAW | CS_VREDRAW;
	wc.lpfnWndProc	 = WindowProc;
	wc.cbClsExtra	 = 0;
	wc.cbWndExtra	 = 0;
	wc.hInstance	 = hInstance;
	wc.hIcon		 = LoadIcon(NULL,IDI_APPLICATION);
	wc.hCursor		 = LoadCursor(NULL,IDC_ARROW);
	wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
	wc.lpszMenuName	 = NULL;
	wc.lpszClassName = __FILE__;
	if(!RegisterClass(&wc)) return 0;

	HWND hWnd=CreateWindow(
		__FILE__,"MCI_SEEKとMCIエラー文字列",
		WS_OVERLAPPEDWINDOW | WS_VISIBLE,
		CW_USEDEFAULT,CW_USEDEFAULT,
		CW_USEDEFAULT,CW_USEDEFAULT, 
		NULL,NULL,hInstance,NULL);
	if(hWnd==NULL) return 0;

	BOOL bRet;
	while((bRet=GetMessage(&msg,NULL,0,0))!=0){
		if(bRet==-1) break;
		DispatchMessage(&msg);
	}

	return (int)msg.wParam;
}