Delphi common file processing and registry file usage examples

Delphi common file processing and registry file usage examples

Foreword:

Registry provides us with methods to operate the registry. Here we use the method provided by TRegIniFile. TRegIniFile inherits from TRegistry. The method provided by TRegIniFile is similar to the method of operating Ini files mentioned earlier, which greatly simplifies our "mysterious" operation. Registry methods, the following are commonly used methods:

1. function CreateKey(const Key: String): Boolean; Create Key
2. function OpenKey(const Key: String; CanCreate: Boolean): Boolean; Open Key. When CanCreate is True, if the Key does not exist, it will be automatically created.
3. procedure EraseSection(const Section: String); Delete
4. WriteString,WriteInteger,WriteBool,WriteCurrency write value
5. ReadString,ReadInteger,ReadBool,ReadCurrency read value
6. ReadSection, ReadSections, ReadSectionValues. Are these familiar? They are the same as the methods of INI files.

See examples

Create node

 var reg:TRegIniFile; begin reg := TRegIniFile.Create; //Create instance reg.RootKey := HKey_Local_Machine; //Set root value if reg.OpenKey('SOFTWARE/MyReg',True) then //Open HKey_Local_Machine/SOFTWARE/ MyReg, if MyReg does not exist, begin is automatically created //Create the MySec item under HKey_Local_Machine/SOFTWARE/MyReg, and then create a string MyValue in MySec with the value China reg.WriteString('MySec','MyValue','China'); end; end;

Delete value

 var reg:TRegIniFile; begin reg := TRegIniFile.Create; //Create instance reg.RootKey := HKey_Local_Machine; //Set root value if reg.OpenKey('SOFTWARE/MyReg/MySec',True) then begin //Delete the MyValue item under HKey_Local_Machine/SOFTWARE/MyReg/MySec reg.DeleteValue('MyValue'); end; end;

DeleteKey

 var reg:TRegIniFile; begin reg := TRegIniFile.Create; //Create instance reg.RootKey := HKey_Local_Machine; //Set root value if reg.OpenKey('SOFTWARE/MyReg',True) then begin //Delete HKey_Local_Machine/SOFTWARE MySec under /MyReg reg.EraseSection('MySec'); end; end;

Reading the list of Keys and reading the list of values ​​under the Key are similar to the operations of the INI file.

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