Wince 通过HotKey动态调节音量控制

参照以前driverdevelop上zhengshijie的transparent程序，加入windows CE下HotKey操作，组合一下完成这个小程序，以供娱乐。



加入HotKey操作

void CTransparentWnd::LoadHotkey()
{
	UINT Modifiers = NULL;
	UINT KeyAdd = 3;
	UINT KeyMinus = 2;
	UINT KeySilent = 1;
	
	Modifiers=MOD_ALT;

#if 0
	RegisterHotKey(this->m_hWnd, 555, Modifiers, KeyAdd+VK_F1);
	RegisterHotKey(this->m_hWnd, 556, Modifiers, KeyMinus+VK_F1);
	RegisterHotKey(this->m_hWnd, 557, Modifiers, KeySilent+VK_F1);
#else
	RegisterHotKey(this->m_hWnd, 555, Modifiers, VK_UP);
	RegisterHotKey(this->m_hWnd, 556, Modifiers, VK_DOWN);
	RegisterHotKey(this->m_hWnd, 557, Modifiers, VK_F2);
#endif
}

默认的是Alt+F2,F3,F4来控制，我稍微修改了一下，采用Alt+↑，Alt+↓来加减音量



加入音量操作

BOOL CTransparentWnd::SetVolumeReg(void)
{
	HKEY    hKey;
    LONG    lResult;
    DWORD   dwType;
    DWORD   dwVal;

	// Calculate the volume that's being set
	int NewVolume = (int)(((int)MaxValue / 10) * vol);

	if (NewVolume > 0xfd00)
	{
		NewVolume = 0xffff;
	}
	// Set the same volume for both the left and the right channels
    uint NewVolumeAllChannels = (((uint)NewVolume & 0x0000ffff) | ((uint)NewVolume << 16));

	// Set the volume
    waveOutSetVolume(0, NewVolumeAllChannels);
	
    lResult = RegOpenKeyEx(HKEY_CURRENT_USER, _T("ControlPanel//Volume"), 0, KEY_ALL_ACCESS, &hKey);
    if(ERROR_SUCCESS == lResult) {
        dwType = REG_DWORD;
		
        dwVal =  NewVolumeAllChannels;
        lResult = RegSetValueEx(hKey, 
			_T("Volume"),
			0, 
			dwType, 
			(LPBYTE)&dwVal,
			sizeof(DWORD));

		RegCloseKey(hKey);
		
			
		return TRUE;
	}
	else
	{
		return FALSE;
	}
}

BOOL CTransparentWnd::GetVolumeReg(void)
{
	HKEY    hKey;
	LONG    lResult;
	DWORD   dwType;
	DWORD   dwVal;
	DWORD   dwLen;
	
	lResult = RegOpenKeyEx(HKEY_CURRENT_USER, _T("ControlPanel//Volume"), 0, KEY_ALL_ACCESS, &hKey);
	if(ERROR_SUCCESS == lResult)
	{
		dwType = REG_DWORD;
		dwLen = sizeof(DWORD);
		
		lResult = RegQueryValueEx(hKey, _T("Volume"), NULL, &dwType,(LPBYTE)&dwVal, &dwLen);
		if(ERROR_SUCCESS == lResult)
		{
			m_Volume = dwVal;
		

		RegCloseKey(hKey);

		//waveOutGetVolume(0, (unsigned long)m_Volume);

		DWORD CalcVol = (DWORD)(dwVal & 0x0000ffff);
		if (CalcVol > 0xfd00)
            CalcVol = 0xffff;
		// Get the volume on a scale of 1 to 10 (to fit the trackbar)
         vol = (int)(DWORD)(CalcVol / ((DWORD)MaxValue / 10));

		return TRUE;
		}
		else
		{
			return FALSE;
		}
	}
	else
	{
		return FALSE;
	}
}

通过读写注册表来实现获取当前音量，然后通过waveOutSetVolume（）来设置音量。



其实也可以通过waveOutSetVolume（），waveOutGetVolume（）来获取和设置系统音量，而不需要读写注册表这么复杂。



大概调试了一下，效果基本满意。只是在一直按住Alt+↑或Alt+↓时，音量进度条未能实时更新，音量也未实时更新。



后续还得进一步优化。



虚拟机上效果如下





执行程序下载地址，支持分辨率为800x480，显示效果最佳

http://download.csdn.net/source/2584410