C言語／C++/WaveTest2 - Sample is best!

開発環境	Microsoft Visual C++ 2010 Express (SP1)
実行環境	Microsoft Windows XP Home Edition (SP3)
プロジェクトの種類	Win32 プロジェクト
プロジェクト名	WaveTest2
アプリケーションの種類	Windows アプリケーション
追加のオプション	空のプロジェクト

WaveTest2.cpp

// WaveTest2 周波数
 
#pragma comment(lib, "winmm")
 
#define _USE_MATH_DEFINES
 
#include <Windows.h>
#include <math.h>
#include "resource.h"
 
#define SAMPLING_RATE	44100
#define DATA_NUM	SAMPLING_RATE
 
// 関数プロトタイプ宣言
INT_PTR CALLBACK DlgProc(HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lParam);
void OnInitDialog(HWND hDlg);
void OnDrawItem(WPARAM wParam, LPARAM lParam);
void OnOK(HWND hDlg);
void OnWomOpen(void);
void OnWomDone(HWND hDlg);
 
// 外部変数
HWAVEOUT hwo;
WAVEHDR wh;
BYTE waveformData[DATA_NUM];
 
//==============================================================================
int CALLBACK WinMain(HINSTANCE hInstance, HINSTANCE, LPSTR, int)
{
	DialogBox(hInstance, MAKEINTRESOURCE(IDD_DIALOG), NULL, DlgProc);
	return 0;
}
 
INT_PTR CALLBACK DlgProc(HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	INT_PTR result = TRUE;	// メッセージを処理した
 
	switch (uMsg) {
	case MM_WOM_OPEN:
		OnWomOpen();
		break;
	case MM_WOM_DONE:
		OnWomDone(hDlg);
		break;
	case WM_DRAWITEM:
		OnDrawItem(wParam, lParam);
		break;
	case WM_COMMAND:
		switch (LOWORD(wParam)) {
		case IDOK:
			OnOK(hDlg);
			break;
		case IDCANCEL:
			EndDialog(hDlg, IDCANCEL);
			break;
		}
		break;
	case WM_INITDIALOG:
		OnInitDialog(hDlg);
		break;
	case WM_CLOSE:
		EndDialog(hDlg, 0);
		break;
	default:
		result = FALSE;	// メッセージを処理しなかった
	}
	return result;
}
 
void OnInitDialog(HWND hDlg)
{
	for (int i = 0; i < DATA_NUM; i++) {
		waveformData[i] = 128;
	}
}
 
void OnDrawItem(WPARAM wParam, LPARAM lParam)
{
	LPDRAWITEMSTRUCT pdi = (LPDRAWITEMSTRUCT)lParam;
	HDC hdc = pdi->hDC;
 
	RECT rc;
	GetClientRect(pdi->hwndItem, &rc);
	FillRect(hdc, &rc, GetSysColorBrush(COLOR_WINDOW));
 
	HPEN pen = CreatePen(PS_SOLID, 0, RGB(0,0,255));
	HGDIOBJ penOld = SelectObject(hdc, pen);
	for (int i = 0; i < rc.right; i++) {
		MoveToEx(hdc, i, rc.bottom / 2, NULL);
		LineTo(hdc, i, rc.bottom * (255 - waveformData[i]) / 256);
	}
	SelectObject(hdc, penOld);
	DeleteObject(pen);
}
 
void OnOK(HWND hDlg)
{
	double freq = GetDlgItemInt(hDlg, IDC_FREQ, NULL, FALSE);
 
	for (int i = 0; i < DATA_NUM; i++) {
		double t = fmod(freq * i / SAMPLING_RATE, 1);
		double y = sin(2 * M_PI * t);
		waveformData[i] = BYTE(128 + 64 * y);
	}
	InvalidateRect(GetDlgItem(hDlg, IDC_PREVIEW), NULL, FALSE);
 
	WAVEFORMATEX wfx;
	wfx.wFormatTag		= WAVE_FORMAT_PCM;
	wfx.wBitsPerSample	= 8;
	wfx.nChannels		= 1;
	wfx.nSamplesPerSec	= SAMPLING_RATE;
	wfx.nBlockAlign		= (wfx.wBitsPerSample / 8) * wfx.nChannels;
	wfx.nAvgBytesPerSec	= wfx.nSamplesPerSec * wfx.nBlockAlign;
	wfx.cbSize		= 0;
 
	MMRESULT mmr = waveOutOpen(&hwo, WAVE_MAPPER, &wfx, (DWORD_PTR)hDlg, 0, CALLBACK_WINDOW);
	if (mmr != MMSYSERR_NOERROR) {
		return;
	}
 
	EnableWindow(GetDlgItem(hDlg, IDOK), FALSE);
}
 
void OnWomOpen(void)
{
	wh.lpData		= (LPSTR)waveformData;
	wh.dwBufferLength	= DATA_NUM;
	wh.dwBytesRecorded	= 0;
	wh.dwUser		= 0;
	wh.dwFlags		= 0;
	wh.dwLoops		= 0;
	wh.lpNext		= NULL;
	wh.reserved		= 0;
 
	MMRESULT mmr = waveOutPrepareHeader(hwo, &wh, sizeof wh);
	if (mmr != MMSYSERR_NOERROR) {
		return;
	}
 
	wh.dwFlags		|= WHDR_BEGINLOOP | WHDR_ENDLOOP;
	wh.dwLoops		= 1;
	mmr = waveOutWrite(hwo, &wh, sizeof wh);
}
 
void OnWomDone(HWND hDlg)
{
	waveOutReset(hwo);
	waveOutUnprepareHeader(hwo, &wh, sizeof wh);
	waveOutClose(hwo);
	EnableWindow(GetDlgItem(hDlg, IDOK), TRUE);
}
 

resource.h

#define IDD_DIALOG	100
 
#define IDC_STATIC	-1
#define IDC_PREVIEW	1000
#define IDC_FREQ	1001
 

WaveTest2.rc

// resource script
 
#include <windows.h>
#include "resource.h"
 
IDD_DIALOG DIALOGEX 100, 100, 320, 200
STYLE WS_POPUPWINDOW | WS_MINIMIZEBOX
EXSTYLE WS_EX_APPWINDOW
CAPTION "WaveText2"
FONT 9, "ＭＳ Ｐゴシック"
BEGIN
	LTEXT		"",IDC_PREVIEW,10,10,300,150,WS_BORDER | SS_OWNERDRAW
	LTEXT		"周波数(&F)",IDC_STATIC,10,170,50,12
	EDITTEXT	IDC_FREQ,60,170,50,12
	LTEXT		"Hz",IDC_STATIC,120,170,20,12
	DEFPUSHBUTTON	"Play(&P)",IDOK,260,170,50,15
END