C言語／C++/MasterVolume - 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	MasterVolume
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
文字セット	Unicode

Windows XPではマスターボリュームの変更はできたが、
Windows 7ではこのアプリケーションのみ変更できた。

MasterVolume.cpp

#pragma comment(lib, "winmm.lib")
 
#include <Windows.h>
#include <CommCtrl.h>
#include <tchar.h>
#include "resource.h"
 
// 関数プロトタイプ宣言
int GetIniFileName(void);
int InitApp(void);
void TermApp(void);
INT_PTR CALLBACK DialogProc(HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lParam);
void OnHScroll(void);
void OnInitDialog(HWND hDlg);
void OnDestroy(HWND hDlg);
void WriteIniFileInt(LPCTSTR szSect, LPCTSTR szKey, int iValue);
void SetVolume(int iPos);
 
// 外部変数
TCHAR g_szIniFile[_MAX_PATH];
HWND g_hVolume;
HWND g_hSlider;
HMIXER g_hmx;
DWORD g_dwControlID;
DWORD g_dwMin;
DWORD g_dwMax;
DWORD g_dwVol;
 
//==============================================================================
int WINAPI _tWinMain(
	HINSTANCE hInstance,
	HINSTANCE hPrevInstance,
	LPTSTR lpCmdLine,
	int nCmdShow)
{
	if (GetIniFileName()) {
		return 0;
	}
	if (InitApp()) {
		return 0;
	}
	DialogBox(hInstance, MAKEINTRESOURCE(IDD_DIALOG), NULL, DialogProc);
	TermApp();
	return 0;
}
 
//------------------------------------------------------------------------------
int GetIniFileName(void)
{
	TCHAR szPath[_MAX_PATH];
	TCHAR szDrive[_MAX_DRIVE];
	TCHAR szDir[_MAX_DIR];
	TCHAR szFName[_MAX_FNAME];
	TCHAR szExt[_MAX_EXT];
 
	if (GetModuleFileName(NULL, szPath, _countof(szPath)) == 0) {
		return -1;
	}
	if (_tsplitpath_s(szPath, szDrive, szDir, szFName, szExt) != 0) {
		return -1;
	}
	if (_tmakepath_s(g_szIniFile, szDrive, szDir, szFName, _T("ini")) != 0) {
		return -1;
	}
	return 0;
}
 
//------------------------------------------------------------------------------
int InitApp(void)
{
	MIXERLINE mxl;
	MIXERCONTROL mxctrl;
	MIXERLINECONTROLS mxlc;
	MIXERCONTROLDETAILS mxcd;
	MIXERCONTROLDETAILS_UNSIGNED mxcdVolume;
	MMRESULT mr;
 
	// ミキサーデバイス
	mr = mixerOpen(&g_hmx, 0, (DWORD_PTR)NULL, 0, MIXER_OBJECTF_MIXER);
	if (mr != MMSYSERR_NOERROR) {
		return -1;
	}
 
	// マスターボリュームID
	mxl.cbStruct		= sizeof (MIXERLINE);
	mxl.dwComponentType	= MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;
	mr = mixerGetLineInfo((HMIXEROBJ)g_hmx, &mxl,
		MIXER_OBJECTF_HMIXER | MIXER_GETLINEINFOF_COMPONENTTYPE);
 
	mxlc.cbStruct		= sizeof (MIXERLINECONTROLS);
	mxlc.dwLineID		= mxl.dwLineID;
	mxlc.dwControlType	= MIXERCONTROL_CONTROLTYPE_VOLUME;
	mxlc.cControls		= 1;
	mxlc.cbmxctrl		= sizeof (MIXERCONTROL);
	mxlc.pamxctrl		= &mxctrl;
	mr = mixerGetLineControls((HMIXEROBJ)g_hmx, &mxlc,
		MIXER_OBJECTF_HMIXER | MIXER_GETLINECONTROLSF_ONEBYTYPE);
 
	g_dwControlID = mxctrl.dwControlID;
	g_dwMin = mxctrl.Bounds.dwMinimum;
	g_dwMax = mxctrl.Bounds.dwMaximum;
 
	// 現在の音量
	mxcd.cbStruct		= sizeof (MIXERCONTROLDETAILS);
	mxcd.dwControlID	= g_dwControlID;
	mxcd.cChannels		= 1;
	mxcd.cMultipleItems	= 0;
	mxcd.cbDetails		= sizeof (MIXERCONTROLDETAILS_UNSIGNED);
	mxcd.paDetails		= &mxcdVolume;
	mr = mixerGetControlDetails((HMIXEROBJ)g_hmx, &mxcd,
		MIXER_OBJECTF_HMIXER | MIXER_GETCONTROLDETAILSF_VALUE);
 
	g_dwVol = mxcdVolume.dwValue;
	return 0;
}
 
//------------------------------------------------------------------------------
void TermApp(void)
{
	MMRESULT mr;
 
	mr = mixerClose(g_hmx);
}
 
//==============================================================================
INT_PTR CALLBACK DialogProc(HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	INT_PTR iRet = TRUE;	// メッセージを処理した
 
	switch (uMsg) {
	case WM_HSCROLL:
		OnHScroll();
		break;
	case WM_INITDIALOG:
		OnInitDialog(hDlg);
		iRet = TRUE;	// SetFocusでフォーカスを設定した場合はFALSE
		break;
	case WM_CLOSE:
		EndDialog(hDlg, IDOK);
		break;
	case WM_DESTROY:
		OnDestroy(hDlg);
		break;
	default:
		iRet = FALSE;	// メッセージを処理しなかった
	}
	return iRet;
}
 
//------------------------------------------------------------------------------
void OnHScroll(void)
{
	MIXERCONTROLDETAILS mxcd;
	MIXERCONTROLDETAILS_UNSIGNED mxcdVolume;
	MMRESULT mr;
	int iPos;
 
	iPos = SendMessage(g_hSlider, TBM_GETPOS, 0, 0);
	SetVolume(iPos);
 
	mxcdVolume.dwValue = g_dwMax * iPos / 100;
	mxcd.cbStruct		= sizeof (MIXERCONTROLDETAILS);
	mxcd.dwControlID	= g_dwControlID;
	mxcd.cChannels		= 1;
	mxcd.cMultipleItems	= 0;
	mxcd.cbDetails		= sizeof (MIXERCONTROLDETAILS_UNSIGNED);
	mxcd.paDetails		= &mxcdVolume;
	mr = mixerSetControlDetails((HMIXEROBJ)g_hmx, &mxcd,
		MIXER_OBJECTF_HMIXER | MIXER_SETCONTROLDETAILSF_VALUE);
}
 
//------------------------------------------------------------------------------
void OnInitDialog(HWND hDlg)
{
	int iX, iY;
	int iPos;
 
	iX = GetPrivateProfileInt(_T("General"), _T("x"), 0, g_szIniFile);
	iY = GetPrivateProfileInt(_T("General"), _T("y"), 0, g_szIniFile);
	SetWindowPos(hDlg, HWND_TOP, iX, iY, 0, 0, SWP_NOSIZE);
 
	g_hVolume = GetDlgItem(hDlg, IDC_VOLUME);
	g_hSlider = GetDlgItem(hDlg, IDC_SLIDER);
	SendMessage(g_hSlider, TBM_SETRANGE, FALSE, MAKELPARAM(0, 100));
	iPos = 100 * g_dwVol / g_dwMax;
	SendMessage(g_hSlider, TBM_SETPOS, TRUE, iPos);
	SetVolume(iPos);
}
 
//------------------------------------------------------------------------------
void OnDestroy(HWND hDlg)
{
	RECT rc;
 
	if (IsIconic(hDlg)) {
		return;
	}
	GetWindowRect(hDlg, &rc);
	WriteIniFileInt(_T("General"), _T("x"), rc.left);
	WriteIniFileInt(_T("General"), _T("y"), rc.top);
}
 
//------------------------------------------------------------------------------
void WriteIniFileInt(LPCTSTR szSect, LPCTSTR szKey, int iValue)
{
	TCHAR szBuf[16];
 
	_stprintf_s(szBuf, _T("%d"), iValue);
	WritePrivateProfileString(szSect, szKey, szBuf, g_szIniFile);
}
 
//------------------------------------------------------------------------------
void SetVolume(int iPos)
{
	TCHAR szBuf[16];
 
	_stprintf_s(szBuf, _T("%d"), iPos);
	SetWindowText(g_hVolume, szBuf);
}
 

resource.h

#define IDC_STATIC	-1
#define IDD_DIALOG	100
#define IDC_VOLUME	1000
#define IDC_SLIDER	1001
 

MasterVolume.rc

// resource script
#include <windows.h>
#include "resource.h"
 
IDD_DIALOG DIALOGEX 0, 0, 240, 48
STYLE WS_POPUPWINDOW | WS_MINIMIZEBOX
EXSTYLE WS_EX_APPWINDOW
CAPTION "MasterVolume"
FONT 9, "ＭＳ Ｐゴシック"
BEGIN
	LTEXT		"0",IDC_STATIC,4,4,20,8
	LTEXT		"100",IDC_STATIC,200,4,20,8
	LTEXT		"",IDC_VOLUME,100,4,20,8
	CONTROL		"",IDC_SLIDER,"msctls_trackbar32",
			TBS_BOTH | WS_TABSTOP,4,16,200,24
END