windows 注册表编程

例子：将本地计算机的Monitor ID写入到注册表中

 (1)获取MonitorID

   

BOOLEAN DeviceMonitorService::EnumClassDevice(const GUID * InterfaceClassGuid)
{

    WriteEventLogEntry(L"EnumClassDevice ",
        EVENTLOG_ERROR_TYPE);
    HDEVINFO DeviceInfoSet;
    HDEVINFO NewDeviceInfoSet;

    SP_DEVINFO_DATA DeviceInfoData;
    ZeroMemory(&DeviceInfoData, sizeof(DeviceInfoData));
    DeviceInfoData.cbSize = sizeof(DeviceInfoData);
    DeviceInfoData.DevInst = 0;
    DeviceInfoData.ClassGuid = *InterfaceClassGuid;
    DeviceInfoData.Reserved = 0;

    DWORD i;
    // 创建空设备信息列表     
    DeviceInfoSet = SetupDiCreateDeviceInfoList(NULL, NULL);
    BOOLEAN ret = FALSE;
    if (DeviceInfoSet == INVALID_HANDLE_VALUE)
    {
        writeErrorLog(L"CreateDeviceInfoList failed: ", GetLastError());
        return ret;
    }

    // 根据接口类型获得新的设备信息列表     

    NewDeviceInfoSet = SetupDiGetClassDevsEx(
        InterfaceClassGuid,
        NULL,
        NULL,
        DIGCF_PRESENT | DIGCF_DEVICEINTERFACE,
        DeviceInfoSet,// 之前创建的设备信息列表     
        NULL,
        NULL
        );
    if (NewDeviceInfoSet == INVALID_HANDLE_VALUE)
    {
        writeErrorLog(L"SetupDiGetClassDevsEx failed: ", GetLastError());
        return ret;        
    }

    for (i = 0;; i++)
    {
        BOOL bResult = SetupDiEnumDeviceInfo(NewDeviceInfoSet,
            i, &DeviceInfoData);
        if (!bResult)
        {
            if (GetLastError() != NO_ERROR &&GetLastError() != ERROR_NO_MORE_ITEMS)
            {
                writeErrorLog(L"SetupDiEnumDeviceInfo ERROR  ", GetLastError());
                return ret;
            }
            break;
        }
        else
        {
            char DeviceID[MAX_DEV_LEN];
            bool resHardwareID = SetupDiGetDeviceRegistryPropertyA(NewDeviceInfoSet, &DeviceInfoData, SPDRP_HARDWAREID, 0, (PBYTE)DeviceID, MAX_DEV_LEN, NULL);
            if (!resHardwareID)
            {
                ZeroMemory(&DeviceID, sizeof(DeviceID));
            }
            else{
                //写入注册表，并break;
                setRegKey(DeviceID, name_monitor);
            }
        }
    }
    SetupDiDestroyDeviceInfoList(DeviceInfoSet);
    return TRUE;
}

 (2)将MonitorID写入到注册表

LPCTSTR SubKey = L"SOFTWARE\Microsoft\Windows\CurrentVersion\Run";

void setRegKey(char* value, LPCWSTR name){
　　　　//将Ansi字符串转换成Unicode字符串
	LPWSTR pwszOut = NULL;// Typedef WCHAR* LPWSTR
	if (value != NULL)
	{
		// Double NULL Termination
		int nOutputStrLen = MultiByteToWideChar(CP_ACP, 0, value, -1, NULL, 0);//获取字符的长度
		pwszOut = new TCHAR[nOutputStrLen]; 

		memset(pwszOut, 0, nOutputStrLen);
		MultiByteToWideChar(CP_ACP, 0, value, -1, pwszOut, nOutputStrLen);
	}

	HKEY key = NULL;
	if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, SubKey, 0, KEY_ALL_ACCESS, &key) == ERROR_SUCCESS){//打开注册表项
		writeDebugEventLog(L"[Service]   RegOpenKeyEx  ok ", EVENTLOG_INFORMATION_TYPE);
		if (RegSetValueEx(key, name, 0, REG_SZ, (unsigned const char*)pwszOut, sizeof(TCHAR)*(lstrlenW(pwszOut) + 1)) == ERROR_SUCCESS){
			writeDebugEventLog(L"[Service]   setRegKey  ok ", EVENTLOG_INFORMATION_TYPE);
		}
		else{
			writeErrorLog(L"[Service]   RegSetValueEx    ", GetLastError());
		}
	}
	else {
		writeErrorLog(L"[Service]   RegOpenKeyEx     ", GetLastError());
	}
	if (key != NULL)	RegCloseKey(key);

	if (pwszOut != NULL) delete[] pwszOut;
}

　　

 (3)从注册表中读取MonitorID

void readRegKey(LPCWSTR name,LPWSTR id){
	HKEY key;
	if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, SubKey, 0, KEY_ALL_ACCESS | KEY_WOW64_32KEY, &key) == ERROR_SUCCESS){

		DWORD nType, nLen;
		WCHAR buff[MAX_DEV_LEN]; 
		RegQueryValueEx(key, name, 0, &nType, (LPBYTE)buff, &nLen);
		writeDebugEventLog(L"[MonitorHelp]   readRegKey  RegQueryValueEx ok ", EVENTLOG_INFORMATION_TYPE);
		RegCloseKey(key);
		lstrcpyW(id,buff);
	}
	else{
		printf("readRegKey    RegOpenKeyEx fail");
		writeDebugEventLog(L"[MonitorHelp]   readRegKey  RegQueryValueEx fail ", EVENTLOG_INFORMATION_TYPE);
	}
}