The Road to Delphi

Delphi – Free Pascal – Oxygene

WMI Tasks using Delphi – Files and Folders

4 Comments

How do I rename a local or remote file?

Use the CIM_DataFile class. Ensure that you pass the entire path name when calling the Rename method, for example, “C:\Foo\Test.txt” instead of “Text.txt”.

const
  wbemFlagForwardOnly = $00000020;
var
  FSWbemLocator : OLEVariant;
  FWMIService   : OLEVariant;
  FWbemObjectSet: OLEVariant;
  FWbemObject   : OLEVariant;
  oEnum         : IEnumvariant;
  iValue        : LongWord;
  FileName      : string;
begin;
  FSWbemLocator := CreateOleObject('WbemScripting.SWbemLocator');
  FWMIService   := FSWbemLocator.ConnectServer('localhost', 'root\CIMV2', '', '');
  FileName      := 'C:\\Foo\\Test.txt';//look how the name of the file to rename is escaped
  FWbemObjectSet:= FWMIService.ExecQuery(Format('SELECT * FROM CIM_DataFile Where Name="%s"',[FileName]),'WQL',wbemFlagForwardOnly);
  oEnum         := IUnknown(FWbemObjectSet._NewEnum) as IEnumVariant;
  if oEnum.Next(1, FWbemObject, iValue) = 0 then
  begin
    FWbemObject.Rename('C:\Foo\Test_new.txt');
    FWbemObject:=Unassigned;
  end;
end;

How do I determine whether users have .MP3 files stored on their computer?

Use the CIM_DataFile class and select files using the following WQL WHERE clause: Where Extension = “MP3”.

const
  wbemFlagForwardOnly = $00000020;
var
  FSWbemLocator : OLEVariant;
  FWMIService   : OLEVariant;
  FWbemObjectSet: OLEVariant;
  FWbemObject   : OLEVariant;
  oEnum         : IEnumvariant;
  iValue        : LongWord;
begin;
  FSWbemLocator := CreateOleObject('WbemScripting.SWbemLocator');
  FWMIService   := FSWbemLocator.ConnectServer('localhost', 'root\CIMV2', '', '');
  FWbemObjectSet:= FWMIService.ExecQuery(Format('SELECT Name,Extension,Path FROM CIM_DataFile Where Extension="%s"',['mp3']),'WQL',wbemFlagForwardOnly);
  oEnum         := IUnknown(FWbemObjectSet._NewEnum) as IEnumVariant;
  if oEnum.Next(1, FWbemObject, iValue) = 0 then
  begin
    Writeln(Format('File Name %s.%s',[String(FWbemObject.Name),String(FWbemObject.Extension)]));
    Writeln(Format('Path      %s',[String(FWbemObject.Path)]));
    FWbemObject:=Unassigned;
  end;
end;

How do I create shared folders on a computer?

Use the Win32_Share class and the Create method.

const
  FILE_SHARE          = 0;
  MAXIMUM_CONNECTIONS = 25;
var
  FSWbemLocator : OLEVariant;
  FWMIService   : OLEVariant;
  FWbemObject   : OLEVariant;
begin;
  FSWbemLocator := CreateOleObject('WbemScripting.SWbemLocator');
  FWMIService   := FSWbemLocator.ConnectServer('localhost', 'root\CIMV2', '', '');
  FWbemObject   := FWMIService.Get('Win32_Share');
  FWbemObject.Create('C:\Finance', 'FinanceShare', FILE_SHARE, MAXIMUM_CONNECTIONS, 'Public share for the Finance group.');
end;

For more samples of using the WMI and Delphi to handle files and folders in local and remote machines check this article Manipulating local/remote files and folders using Delphi and WMI

This post is based in the MSDN entry WMI Tasks: Files and Folders

Author: Rodrigo

Just another Delphi guy.

4 thoughts on “WMI Tasks using Delphi – Files and Folders

  1. I tried the create shared folder routine. Running Windows 8.1, Delphi XE6. It compiles, steps through the code with no errors, but does not create the folder or set the folder as shared. As a test I simply cut and pasted your code attempting to create the shared folder C:\Finance

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s