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Call this method to retrieve the string data for a specified value name.

      LONG QueryStringValue(
   LPCTSTR pszValueName,
   LPTSTR pszValue,
   ULONG* pnChars 
) throw( );


Pointer to a null-terminated string containing the name of the value to query.


Pointer to a buffer that receives the string data.


The size, in TCHARs, of the buffer pointed to by pszValue. When the method returns, pnChars contains the size, in TCHARs, of the string retrieved, including a terminating null character.

If the method succeeds, ERROR_SUCCESS is returned. If the method fails to read a value, it returns a nonzero error code defined in WINERROR.H. If the data referenced is not of type REG_SZ, ERROR_INVALID_DATA is returned. If the method returns ERROR_MORE_DATA, pnChars equals zero, not the required buffer size in bytes.

This method makes use of RegQueryValueEx and confirms that the correct type of data is returned. See RegQueryValueEx for more details.

System_CAPS_security Security Note

This method allows the caller to specify any registry location, potentially reading data which cannot be trusted. Also, the RegQueryValueEx function used by this method does not explicitly handle strings which are NULL terminated. Both conditions should be checked for by the calling code.


Header: atlbase.h