Running WMIC command from remote machine

To run WMIC (Windows Management Instrumentation Command-line) command from remote computer requires some configuration in the target system.
When I ran my first WMIC command from remote I got error like this-

This is due to Access denied by DCOM security. Means the user does not have remote access to the computer through DCOM. Typically, DCOM errors occur when connecting to a remote computer with a different operating system version.

Let's see how to give  the user Remote Launch and Remote Activation permissions. (Keep in mind that all the setting will be done on target machine)

1. Go to Run (either press window key+r or click on start button) and type dcompcnfg.

2. A component service window will open. Expand the component service tree and then expand Computers tree. Under Computer you will see My Computer 

3. Right click on My Computer and then click on Properties, a dialogue window will appear (close main window to see this). Now click on the COM Security tab.

4. Now you will see two buttons Edit Limits  in two sections Access Permissions and Launch and Activation Permissions

5. Click on both buttons and add desired user to get access permissionss and launch and activation permissions and then tick Remote Access  in Access Permissions section and also tick to allow Remote Launch and Remote Activation in Launch and Activation Permissions section.

 

6. Now go to DCOM config tree menu in My Computer, Expand DCOM Config and search Windows Management and Instrumentation. 

7. Right click on this, select Properties. A new dialogue window will appear.  Click on Security tab. In access permission section click on Customisze  radio button  and then Edit button. Allow remote access check box for desired user.

Done everything to run WMIC command to run from remote system on this machine.

Now run following command using username and password

Getting System Hardware Information Using Java (only windows)

Save your precious data

After searching on the web I found that there is no any pure Java code to get all system hardware information. Although we can get some system details using Java like processor, system architecture and the number of processors using the code below:-

System.out.println(System.getenv("PROCESSOR_IDENTIFIER")); System.out.println(System.getenv("PROCESSOR_ARCHITECTURE")); System.out.println(System.getenv("PROCESSOR_ARCHITEW6432")); System.out.println(System.getenv("NUMBER_OF_PROCESSORS"));

 But beyond this if we want all hardware associated to system like hard disk, RAM, CD/DVD W/ROM network card, BIOS, monitor and other. Then there is no direct code like mentioned above is not available. Either you have to use some third party API or windows tools to get system information.

Using other APIs is sometimes complex to use in our code and configuration is not easy. You can use API like SIGAR which I have heard most.
You can visit it here and can download from here.
But it is also limited.

 In the second approach, you can use windows tool in your Java program to get detailed information of system hardware, which is known as WMIC(Windows Management Instrumentation Command-line).
The sample code is given below to get some system hardware and software information.

String[][] commands = new String[][]
{
 {"CMD", "/C", "WMIC OS GET Installdate,SerialNumber"},
 //OS Installation date & Time, OS Serial Number
 {"CMD", "/C", "WMIC BASEBOARD GET SerialNumber"},
 // Motherboadrd Serial Number 
 {"CMD", "/C", "WMIC CPU GET ProcessorId"}, 
// Processor ID 
 {"CMD", "/C", "WMIC COMPUTERSYSTEM GET Name"},
// Computer Name
 {"CMD", "/C", "WMIC diskdrive GET Name, Manufacturer, Model, InterfaceType, MediaLoaded, MediaType"},
//HDD Details 
 {"CMD", "/C", "WMIC memphysical GET Manufacturer, Model, SerialNumber, MaxCapacity, MemoryDevices"}, 
 }; 

 for (int i = 0; i < commands.length; i++)
 {

 String[] com = commands[i];
 Process process = Runtime.getRuntime().exec(com);
 process.getOutputStream().close();
 //Closing output stream of the process
 System.out.println();
 String s = null;
 //Reading sucessful output of the command
 BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream())); 

 while ((s = reader.readLine()) != null) 
{ 
 System.out.print(s);
 }

 // Reading error if any 
 reader = new BufferedReader(new InputStreamReader(process.getErrorStream()));

 while ((s = reader.readLine()) != null)
 { 
 System.out.print(s); 
 }

 }

 Detailed about WMIC you can visit here.

Some other useful commands given below:-

baseboard get Manufacturer, Model, Name, PartNumber, slotlayout, serialnumber, poweredon

bios get name, version, serialnumber

bootconfig get BootDirectory, Caption, TempDirectory, Lastdrive

cdrom get Name, Drive, Volumename

computersystem get Name, domain, Manufacturer, Model, NumberofProcessors, PrimaryOwnerName,Username, Roles, totalphysicalmemory

cpu get Name, Caption, MaxClockSpeed, DeviceID, status

datafile where name='c:\\boot.ini' get Archive, FileSize, FileType, InstallDate, Readable, Writeable, System, Version

dcomapp get Name, AppID /format:list desktop get Name, ScreenSaverExecutable, ScreenSaverActive, Wallpaper/format:list

desktopmonitor get screenheight, screenwidth

diskdrive get Name, Manufacturer, Model, InterfaceType, MediaLoaded, MediaType

diskquota get User, Warninglimit, DiskSpaceUsed, QuotaVolume

environment get Description, VariableValue

fsdir where name='c:\\windows' get Archive, CreationDate, LastModified, Readable, Writeable, System, Hidden, Status

group get Caption, InstallDate, LocalAccount, Domain, SID, Status

idecontroller get Name, Manufacturer, DeviceID, Status

irq get Name, Status

job get Name, Owner, DaysOfMonth, DaysOfWeek, ElapsedTime, JobStatus, StartTime, Status

loadorder get Name, DriverEnabled, GroupOrder, Status

logicaldisk get Name, Compressed, Description, DriveType, FileSystem,FreeSpace, SupportsDiskQuotas, VolumeDirty, VolumeName

memcache get Name, BlockSize, Purpose, MaxCacheSize, Status

memlogical get AvailableVirtualMemory, TotalPageFileSpace,TotalPhysicalMemory, TotalVirtualMemory

memphysical get Manufacturer, Model, SerialNumber, MaxCapacity,MemoryDevices

netclient get Caption, Name, Manufacturer, Status

netlogin get Name, Fullname, ScriptPath, Profile, UserID, NumberOfLogons,PasswordAge, LogonServer, HomeDirectory, PrimaryGroupID

netprotocol get Caption, Description, GuaranteesSequencing,SupportsBroadcasting, SupportsEncryption, Status

netuse get Caption, DisplayType, LocalName, Name, ProviderName, Status

nic get AdapterType, AutoSense, Name, Installed, MACAddress,PNPDeviceID,PowerManagementSupported, Speed, StatusInfo

nicconfig get MACAddress, DefaultIPGateway, IPAddress, IPSubnet, DNSHostName, DNSDomain

nicconfig get MACAddress, IPAddress, DHCPEnabled, DHCPLeaseExpires, DHCPLeaseObtained, DHCPServer

nicconfig get MACAddress, IPAddress, DNSHostName, DNSDomain, DNSDomainSuffixSearchOrder, DNSEnabledForWINSResolution, DNSServerSearchOrder

nicconfig get MACAddress, IPAddress, WINSPrimaryServer, WINSSecondaryServer, WINSEnableLMHostsLookup, WINSHostLookupFile

ntdomain get Caption, ClientSiteName, DomainControllerAddress, DomainControllerName, Roles, Status

ntevent where (LogFile='system' and SourceName='W32Time') get Message, TimeGenerated

ntevent where (LogFile='system' and SourceName='W32Time' and Message like '%timesource%') get Message, TimeGenerated

ntevent where (LogFile='system' and SourceName='W32Time' and EventCode!='29') get TimeGenerated, EventCode, Message

onboarddevice get Description, DeviceType, Enabled, Status

os get Version, Caption, CountryCode, CSName, Description, InstallDate, SerialNumber, ServicePackMajorVersion, WindowsDirectory /format:list

os get CurrentTimeZone, FreePhysicalMemory, FreeVirtualMemory, LastBootUpTime, NumberofProcesses, NumberofUsers, Organization, RegisteredUser, Status

pagefile get Caption, CurrentUsage, Status, TempPageFile

pagefileset get Name, InitialSize, MaximumSize

partition get Caption, Size, PrimaryPartition, Status, Type

printer get DeviceID, DriverName, Hidden, Name, PortName, PowerManagementSupported, PrintJobDataType, VerticalResolution, Horizontalresolution

printjob get Description, Document, ElapsedTime, HostPrintQueue, JobID, JobStatus, Name, Notify, Owner, TimeSubmitted, TotalPages

process get Caption, CommandLine, Handle, HandleCount, PageFaults, PageFileUsage, PArentProcessId, ProcessId, ThreadCount

product get Description, InstallDate, Name, Vendor, Version

qfe get description, FixComments, HotFixID, InstalledBy, InstalledOn, ServicePackInEffect

quotasetting get Caption, DefaultLimit, Description, DefaultWarningLimit, SettingID, State

recoveros get AutoReboot, DebugFilePath, WriteDebugInfo, WriteToSystemLog

Registry get CurrentSize, MaximumSize, ProposedSize, Status

scsicontroller get Caption, DeviceID, Manufacturer, PNPDeviceID

server get ErrorsAccessPermissions, ErrorsGrantedAccess, ErrorsLogon, ErrorsSystem, FilesOpen, FileDirectorySearches

service get Name, Caption, State, ServiceType, StartMode, pathname

share get name, path, status

sounddev get Caption, DeviceID, PNPDeviceID, Manufacturer, status

startup get Caption, Location, Command sysaccount get Caption, Domain, Name, SID, SIDType, Status

sysdriver get Caption, Name, PathName, ServiceType, State, Status

systemenclosure get Caption, Height, Depth, Manufacturer, Model, SMBIOSAssetTag, AudibleAlarm, SecurityStatus, SecurityBreach, PoweredOn, NumberOfPowerCords

systemslot get Number, SlotDesignation, Status, SupportsHotPlug, Version, CurrentUsage, ConnectorPinout

tapedrive get Name, Capabilities, Compression, Description, MediaType, NeedsCleaning, Status, StatusInfo

timezone get Caption, Bias, DaylightBias, DaylightName, StandardName

useraccount get AccountType, Description, Domain, Disabled, LocalAccount, Lockout, PasswordChangeable, PasswordExpires, PasswordRequired, SID

memorychip get BankLabel, Capacity, Caption, CreationClassName, DataWidth, Description, Devicelocator, FormFactor, HotSwappable, InstallDate, InterleaveDataDepth, InterleavePosition, Manufacturer, MemoryType, Model, Name, OtherIdentifyingInfo, PartNumber, PositionInRow, PoweredOn, Removable, Replaceable,SerialNumber, SKU, Speed, Status, Tag, TotalWidth, TypeDetail, Version

Data types in C and its size

Data types in C and its size

C89 -[those features of C defined by the original, 1989 ANSI standard for C (commonly referred to as C89)]- defines five foundational data types

1. Character declared as char

2. Integer declared as int

3. Floating-point decalred as float

5. Double floating point declared as double

4. Valueless declared as void

Other several data types arederived from these basic data types.

Now, about the size and range of these data types we have heared many different things. Some people says that integer takes 2 bytes, some says it takes 4 bytes. It is true but not clear.

“Most important, the size and range of these data types may vary among processor types and compilers.” However in all case char is 1 byte.

The size of an int is generally same as the word (The memory stores binary information in group of bits called words ) length of the execution environment of program.

For most 16-bit environments such as DOS, an int is 16 bits (2 bytes). For most 32-bit environments an int is 32 bits (4 bytes).

So, you can not be sure about the size of an integer if your program is going to be executed on the widest range of environments.

It is important to understand that C stipulates only the minimal range of each data type, not its size

in bytes.

Valid data type combinations supported by C, along with their minimal ranges and typical bit widths are given below. Remember, the table shows the minimum range that these types will have, not their typical range. For example, on computers that use two's complement arithmetic (which is nearly all), an integer will have a range of at least 32,767 to –32,768.

Type                               Typical Size in Bits                                              Minimal Range

char                                        8                                                                       –127 to 127

unsigned char                        8                                                                       0 to 255

signed char                            8                                                                       –127 to 127

int                                     16 or 32                                                                 –32,767 to 32,767

unsigned int                     16 or 32                                                                 0 to 65,535

signed int                         16 or 32                                                                Same as int

short int                               16                                                                     –32,767 to 32,767

unsigned short int               16                                                                      0 to 65,535

signed short int                   16                                                                     Same as short int

long int                               32                                                            –2,147,483,647 to 2,147,483,647

long long int                       64                                                    –(263 – 1) to 263 – 1 (Added by C99)

signed long int                    32                                                                      Same as long int

unsigned long int                32                                                                   0 to 4,294,967,295

unsigned long long int        64                                                       264 – 1 (Added by C99)

float                                    32                                             1E–37 to 1E+37 with six digits of precision

double                                 64                                            1E–37 to 1E+37 with ten digits of precision

long double                         80                                             1E–37 to 1E+37 with ten digits of precision

Reference:-C: The Complete Reference 4^th Edition by Herbert Schildt