fcl-registry
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fcl-registry is an FCL unit that provides access to the Windows registry.
Registry terms
RootKey: registry hive where you want to start accessing the registry. Examples: HKEY_LOCAL_MACHINE, HKEY_CURRENT_USER
Key: the path to the "directory" that contains individual data. This is a bit counter-intuitive but a holdover from compatibility with earlier versions of the registry.
Name/value: the actual name/value pairs in the Key "directory". Each key can have a default value, whose name is (an empty string.
Example
Example that tries to get a value:
uses ... registry...
var
CompileCommand: string='';
Registry: TRegistry;
begin
Registry := TRegistry.Create;
try
// Navigate to proper "directory":
Registry.RootKey := HKEY_LOCAL_MACHINE;
if Registry.OpenKeyReadOnly('\SOFTWARE\Classes\InnoSetupScriptFile\shell\Compile\Command') then
CompileCommand:=Registry.ReadString(''); //read the value of the default name
finally
Registry.Free;
end;
end;
Accessing 64 bit and 32 bit registry views
If you have 64 bit Windows, the registry is split up into a 64 bit and 32 bit (compatibility) part. By default, if you run a 32 bit process, you see the 32 bit part; if you run a 64 bit application, you see the 64 bit part.
You can also access the 32 bit part from 64 bit applications and vice versa. From MSDN: http://msdn.microsoft.com/en-us/library/windows/desktop/aa384129%28v=vs.85%29.aspx
- KEY_WOW64_64KEY: Access a 64-bit key from either a 32-bit or 64-bit application.
- KEY_WOW64_32KEY: Access a 32-bit key from either a 32-bit or 64-bit application.
These keys are defined in the registry unit so you can just use them:
- in the registry object's Access property? to do: test this.
- in the registry.create call, e.g.
TRegistry.Create(KEY_READ or KEY_WOW64_64KEY);