Writing and Deleting Registry Data

An application can use either the RegSetValue or RegSetValueEx function to associate a value and its data with a key. RegSetValue works only with strings (values having the REG_SZ type). RegSetValueEx, however, can write values with any type of data. Either of these functions can create a key and its value at the same time.

To delete a value from a key, an application can use the RegDeleteValue function. To delete a key, it can use the RegDeleteKey function. A deleted key is not removed until the last handle to it has been closed. Subkeys and values cannot be created under a deleted key.

To change a key's security information, an application can use the RegSetKeySecurity function.

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