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Retrieves the path of the system directory. The system directory contains system files such as dynamic-link libraries and drivers.

This function is provided primarily for compatibility. Applications should store code in the Program Files folder and persistent data in the Application Data folder in the user's profile. For more information, see ShGetFolderPath.


UINT WINAPI GetSystemDirectory(
  _Out_  LPTSTR lpBuffer,
  _In_   UINT uSize


lpBuffer [out]
A pointer to the buffer to receive the path. This path does not end with a backslash unless the system directory is the root directory. For example, if the system directory is named Windows\System32 on drive C, the path of the system directory retrieved by this function is C:\Windows\System32.
uSize [in]
The maximum size of the buffer, in TCHARs.

Return value

If the function succeeds, the return value is the length, in TCHARs, of the string copied to the buffer, not including the terminating null character. If the length is greater than the size of the buffer, the return value is the size of the buffer required to hold the path, including the terminating null character.

If the function fails, the return value is zero. To get extended error information, call GetLastError.