main.cpp

to show the waveform of audio file and play it on computer Purpose: Familiar with WAV file format a

//多媒体作业：wav播放器
//0213202班 赵子铭
//filename  main.cpp
//the main part of the player
#pragma comment( lib, "Winmm.LIB");

#define WIN32_LEAN_AND_MEAN  
#define UNTITLED "(untitled)"
#define BUTTON_BASE_ID   100
#define NUM_BUTTONS      3
#define WINDOW_CLASS_NAME "WINCLASS1"

#include <windows.h>   // include all the windows headers
#include <windowsx.h>  // include useful macros
#include <mmsystem.h>  // very important and include WINMM.LIB too!
#include <Commdlg.h>
#include <cstdio>
#include <cstdlib>
#include <Cderr.h>
#include <cmath>
#include "resourse.h"
#include "WavHead.h"

using namespace std;

static char szAppName[] = "Ziming's raw wave player" ;
static HWND hDlgModeless ;

// Functions in openfile.Cpp

void 	PopFileInitialize 			 (HWND) ;
BOOL 	PopFileOpenDlg    			 (HWND, PTSTR, PTSTR) ;
BOOL 	PopFileSaveDlg    			 (HWND, PTSTR, PTSTR) ;
BOOL 	PopFileRead       			 (HWND, PTSTR) ;
BOOL 	PopFileWrite      			 (HWND, PTSTR) ;
long    PopFileLength                (FILE *file);

void DoCaption (HWND hwnd, char *szTitleName)
{
	char szCaption[64 + _MAX_FNAME + _MAX_EXT] ;

	wsprintf (szCaption, "%s - %s", szAppName,
		szTitleName[0] ? szTitleName : UNTITLED) ;

	SetWindowText (hwnd, szCaption) ;
}

// GLOBALS ////////////////////////////////////////////////
HWND      main_window_handle = NULL; // globally track main window
HINSTANCE hinstance_app      = NULL; // globally track hinstance
MSG		   msg;		                 // generic message

// FUNCTIONS //////////////////////////////////////////////
LRESULT CALLBACK WindowProc(HWND hwnd, 
							UINT msg, 
							WPARAM wparam, 
							LPARAM lparam)
{
	PAINTSTRUCT		ps;		
	HDC				hdc;	// handle to a device context

	static int            cxClient, cyClient;
	static char      szFileName[_MAX_PATH] ;
	static char      szTitleName[_MAX_FNAME + _MAX_EXT] ;
	static HMMIO      hfile=NULL;
	static Cwavefilehead buffer;
	unsigned char*c;
	short *c1;
	static DWORD ds;
	static HPEN hpen,old_hpen;
	int i,x0,y0;
	HMENU hMenu; 
	hMenu = GetMenu (hwnd) ;
	TCHAR  str[160];

	switch(msg)
	{	
	case WM_CREATE: 
		{
			PopFileInitialize (hwnd) ;// return success
			EnableMenuItem (hMenu, MENU_EDIT_ID_INFOR, MF_GRAYED) ;
			return(0);
		} 
	case WM_SIZE: 
		{
			cxClient = LOWORD(lparam);//客户区的宽度
			cyClient = HIWORD(lparam);//客户区的高度
			return(0);
		} 

	case WM_COMMAND:
		{
			switch(LOWORD(wparam))
			{
			case MENU_FILE_ID_EXIT:
				{
					// terminate window
					PostQuitMessage(0);
					return(0);
				}
			case MENU_HELP_ABOUT:
				{
					TCHAR about[1000];
					wsprintf (about, "0213202 Zhao Ziming developed with WINAPI:\n\nprogram provides GUI and file_select dialogue\nuser can only choose the .wav file\nprogram provides the waveform\nprogram can play the wav file\nprogram provides the information about the file\n");

					MessageBox(hwnd, about, 
						"About Program",
						MB_OK );
					return(0);
				}
			case MENU_HELP_USAGE:
				{
					TCHAR usage[1000];
					wsprintf (usage, "usage:\nplease open a file before click 'information' button\n\nreference:\n<Programming Windows>\n<Programming Windows with MFC>\n");

					MessageBox(hwnd, usage, 
						"About Program",
						MB_OK );
					return(0);
				}

			case MENU_EDIT_ID_INFOR: 
				{
					wsprintf(str,"the wav file has %d channel(s)\nSamples per second:%d\nSample rate * block align:%d\nBit per samples:%d\n",
						buffer.channel,buffer.sampl,buffer.bytepersecblockalign,buffer.bitpersamples);
					MessageBox(hwnd, str, 
						"Information about the file",
						MB_OK );
					return(0);
				}

			case MENU_FILE_ID_OPEN:
				{

					PopFileOpenDlg (hwnd, szFileName, szTitleName);
					EnableMenuItem (hMenu, MENU_EDIT_ID_INFOR, MF_ENABLED) ;
					FILE  *file ;
					hfile = mmioOpen(szFileName,NULL,MMIO_READ);

					if (NULL == (file = fopen (szFileName, "r")))
						return FALSE ;

					fread (&buffer, sizeof( Cwavefilehead ), 1, file) ;
					fclose(file);
					//UpdateWindow (hwnd) ;
					RECT rc;
					GetClientRect(hwnd,&rc);
					InvalidateRect(hwnd,&rc,TRUE);
					PlaySound(szFileName,NULL,SND_FILENAME | SND_ASYNC);
					DoCaption (hwnd, szTitleName) ;
					return (0);
				}

			case MENU_FILE_ID_STOP:
				{
				PlaySound(NULL,NULL, SND_ASYNC);
				return(0);
				}
			} // end switch wparam
		}// end WM_COMMAND

	case WM_PAINT: 
		{
			hdc = BeginPaint(hwnd,&ps);
			//hfile = mmioOpen(szFileName,NULL,MMIO_READ);
			if(hfile==NULL)
				return 0;
			mmioSeek(hfile,4,SEEK_SET);
			mmioRead(hfile,(char*)&ds,4);

			hpen = CreatePen(PS_SOLID,1,RGB(255,0,0));
			old_hpen = (HPEN)SelectObject(hdc,hpen); 

			if(buffer.bitpersamples==8)
			{
				c= new unsigned char[ds];
				mmioSeek(hfile,44,SEEK_SET);
				mmioRead(hfile,reinterpret_cast<HPSTR>(c),ds);	

				SetMapMode(hdc, MM_ANISOTROPIC);
				SetWindowExtEx(hdc, ds, 500, NULL);
				SetViewportExtEx(hdc, 650, 256, NULL); 
				SetViewportOrgEx(hdc,cxClient*0.2,cyClient*0.5,NULL);					 

				for (i=0;i<ds-4;i++)
				{ 
					x0=i;
					y0=(int)(c[i]);
					MoveToEx(hdc,x0, 0, NULL);
					LineTo(hdc,x0,y0-128);
				}
			}

			if(buffer.bitpersamples==16)
			{
				c1= new short[ds/2];
				mmioSeek(hfile,44,SEEK_SET);
				mmioRead(hfile,reinterpret_cast<HPSTR>(c1),ds);	

				SetMapMode(hdc, MM_ANISOTROPIC);
				SetWindowExtEx(hdc, ds/2, 10000, NULL);
				SetViewportExtEx(hdc, 650, 256, NULL); 
				SetViewportOrgEx(hdc,cxClient*0.2,cyClient*0.5,NULL);

				for (i=0;i<(ds/2-4);i++)
				{
					x0=i;
					y0=c1[i];
					MoveToEx(hdc,x0, 0, NULL);
					LineTo(hdc,x0,y0-128);
				}   SelectObject(hdc,old_hpen);
			}	
			DeleteObject(hpen); 

			
			DoCaption (hwnd, szTitleName) ;
			EndPaint(hwnd,&ps);
			return(0);
		} 

	case WM_DESTROY: 
		{
			PostQuitMessage(0);
			return(0);
		} 


	} // end switch
	return (DefWindowProc(hwnd, msg, wparam, lparam));

} // end WinProc

// WINMAIN 
int WINAPI WinMain(	HINSTANCE hinstance,
				   HINSTANCE hprevinstance,
				   LPSTR lpcmdline,
				   int ncmdshow)
{

	WNDCLASSEX winclass; // this will hold the class
	HWND	   hwnd;	 // generic window handle

	winclass.cbSize         = sizeof(WNDCLASSEX);
	winclass.style			= CS_DBLCLKS | CS_OWNDC | 
		CS_HREDRAW | CS_VREDRAW ;
	winclass.lpfnWndProc	= WindowProc;
	winclass.cbClsExtra		= 0;
	winclass.cbWndExtra		= 0;
	winclass.hInstance		= hinstance;
	winclass.hIcon			= LoadIcon(hinstance, MAKEINTRESOURCE(ICON_WAVPLAYER));
	winclass.hCursor		= NULL;
	winclass.hbrBackground	= (HBRUSH)GetStockObject(WHITE_BRUSH);
	winclass.lpszMenuName	= "SoundMenu";
	winclass.lpszClassName	= WINDOW_CLASS_NAME;
	winclass.hIconSm        = LoadIcon(hinstance, MAKEINTRESOURCE(ICON_WAVPLAYER));

	// save hinstance in global
	hinstance_app = hinstance;

	// register the window class
	if (!RegisterClassEx(&winclass))
		return(0);

	// create the window
	if (!(hwnd = CreateWindowEx(NULL,              
		WINDOW_CLASS_NAME,    
		"Ziming's raw wave player", // title
		WS_OVERLAPPEDWINDOW | WS_VISIBLE | WS_MAXIMIZE ,
		0,0,	 
		400,400, 
		NULL,	 
		NULL,
		hinstance,// instance of this application
		NULL)))
		return(0);

	// save main window handle
	main_window_handle = hwnd;
	ShowWindow (hwnd, ncmdshow) ;
	UpdateWindow (hwnd) ;

	while (GetMessage (&msg, NULL, 0, 0))
	{
		TranslateMessage (&msg) ;
		DispatchMessage (&msg) ;
	}
	return(msg.wParam);

} // end WinMain