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SHQueryValueEx

DWORD SHQueryValueEx(
    HKEY     hkey,
    LPCTSTR  pszValue,
    LPDWORD  pdwReserved,
    LPDWORD  pdwType,
    LPVOID   pvData,
    LPDWORD  pcbData
    );

Opens a registry key and queries it for a specific value.

• Returns ERROR_SUCCESS if successful, or a nonzero error code defined in Winerror.h otherwise. You can use the FormatMessage function with the FORMAT_MESSAGE_FROM_SYSTEM flag to get a generic description of the error.

hkey

Handle to the currently open key, or any of the following predefined values:

HKEY_CLASSES_ROOT

HKEY_CURRENT_CONFIG

HKEY_CURRENT_USER

HKEY_DYN_DATA (Windows 95 only)

HKEY_LOCAL_MACHINE

HKEY_PERFORMANCE_DATA (Windows NT only)

HKEY_USERS

pszValue

Address of the null-terminated string that contains the name of the value to be queried.

pdwReserved

Reserved; must be null.

pdwType

Address of the variable that receives the key's value type. For more information, see HKEY_TYPE.

pvData

Address of the buffer that receives the value's data. This parameter can be NULL if the data is not required.

pcbData

Address of the variable that specifies the size, in bytes, of the buffer pointed to by the pvData parameter. When the function returns, this variable contains the size of the data copied to pvData.

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