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Access to the registry without administrator

I have several long-standing applications written in Delphi that save their settings in the registry. I used HKEY_LOCAL_MACHINE for "hard" settings, such as configuration settings, and HKEY_CURRENT_USER for "soft" information, such as window positions, MRU lists, etc.

Now my users tell me that in non-admin mode (standard user) applications do not work. Looking, I see that I can not read the parameter placed in HKEY_LOCAL_MACHINE when the application was in administrator mode.

What are my options for this? I know little about standard mode and how this affects access to the registry in general. Any information appreciated.

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6 answers

You can read from HKLM as a non-administrator user; you just can't write on it.

Use TRegistry.Create (KEY_READ) when creating it and set RootKey to HKLM.

var
  Reg: TRegistry;
begin
  Reg := TRegistry.Create(KEY_READ)
  try
    Reg.RootKey := HKLM;
    // Read value here
  finally
    Reg.Free;
  end;
end;

You can also use TRegistry.OpenKeyReadOnly () when opening a specific registry key; it also helps without administrator access to registry areas.

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See " Where to store program settings instead of HKEY_LOCAL_MACHINE? "

The top-voted answer is especially helpful.

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 procedure RunOnStartup(const sCmdLine: string; bRunOnce: boolean = false; Remove: Boolean = false) ;
 var
   sKey: string;
   Section: string;
 const
   ApplicationTitle = "Your Application TITLE";
 begin
   if (bRunOnce) then
     sKey := 'Once'
   else
     sKey := '';

   Section := 'Software\Microsoft\Windows\CurrentVersion\Run' + sKey + #0;

   with TRegIniFile.Create('') do
     try
       RootKey := HKEY_LOCAL_MACHINE;
       if Remove then
         DeleteKey(Section, ApplicationTitle)
       else
         WriteString(Section, ApplicationTitle, sCmdLine) ;
     finally
       Free;
     end;
 end;

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XML :

 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
 <assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0]
  <assemblyIdentity version="1.1.1.1"
   processorArchitecture="X86"
   name="YourApplicationExeName"
   type="win32"/>
  <description>elevate execution level</description>
  <trustInfo xmlns="urn:schemas-microsoft-com:asm.v2]
  <security>
   <requestedPrivileges>
    <requestedExecutionLevel level="requireAdministrator" uiAccess="false"/>
   </requestedPrivileges>
  </security>
  </trustInfo>
 </assembly>

XML YourApplicationName.manifest : 1 24 "YourApplicationName.manifest"

YourApplicationName.RC , : brcc32 YourApplicationName.RC -foYourApplicationName.REC

YourApplicationName.REC

YourApplicationName.REC . DPR , : {$R YourApplicationName.REC}

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http://delphi.about.com/od/delphitips2009/qt/delphi-vista-registry-run-on-startup.htm

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