The registry Command
Windows uses the registry to store various system configuration information. The Windows tool to browse and edit the registry is called regedit. Tcl provides a registry command. It is a loadable package that you must load by using:
package require registry
The registry structure has keys, value names, and typed data. The value names are stored under a key, and each value name has data associated with it. The keys are organized into a hierarchical naming system, so another way to think of the value names is as an extra level in the hierarchy. The main point is that you need to specify both a key name and a value name in order to get something out of the registry. The key names have one of the following formats:
\hostnamerootnamekeypath rootnamekeypath rootname
The rootname is one of HKEY_LOCAL_MACHINE, HKEY_PERFORMANCE_DATA, HKEY_USERS, HKEY_CLASSES_ROOT, HKEY_CURRENT_USER, HKEY_CURRENT_CONFIG, or HKEY_DYN_DATA. Tables 9-8 and 9-9 summarize the registry command and data types:
| registry delete key ?valueName? | Deletes the key and the named value, or it deletes all values under the key if valueName is not specified. |
| registry get key valueName | Returns the value associated with valueName under key. |
| registry keys key ?pat? | Returns the list of keys or value names under key that match pat, which is a string match pattern. |
| registry set key | Creates key. |
| registry set key valueName data ?type? | Creates valueName under key with value data of the given type. Types are listed in Table 9-9. |
| registry type key valueName | Returns the type of valueName under key. |
| registry values key ?pat? | Returns the names of the values stored under key that match pat, which is a string match pattern. |
| binary | Arbitrary binary data. |
| none | Arbitrary binary data. |
| expand_sz | A string that contains references to environment variables with the %VARNAME% syntax. |
| dword | A 32-bit integer. |
| dword_big_endian | A 32-bit integer in the other byte order. It is represented in Tcl as a decimal string. |
| link | A symbolic link. |
| multi_sz | An array of strings, which are represented as a Tcl list. |
| resource_list | A device driver resource list. |