HINTERNET InternetOpen(
    IN LPCSTR lpszAgent,
    IN DWORD dwAccessType,
    IN LPCSTR lpszProxyName,
    IN LPCSTR lpszProxyBypass,
    IN DWORD dwFlags
)

HINTERNET InternetConnect(
    IN HINTERNET hInternetSession,
    IN LPCSTR lpszServerName,
    IN INTERNET_PORT nServerPort,
    IN LPCSTR lpszUsername,
    IN LPCSTR lpszPassword,
    IN DWORD dwService,
    IN DWORD dwFlags,
    IN DWORD dwContext
)

BOOL FtpGetFile(
    IN HINTERNET hFtpSession,
    IN LPCSTR lpszRemoteFile,
    IN LPCSTR lpszNewFile,
    IN BOOL fFailIfExists,
    IN DWORD dwLocalFlagsAndAttributes,
    IN DWORD dwInternetFlags,
    IN DWORD dwContext
)

dwContext には 0 をセット

Public Const FILE_ATTRIBUTE_READONLY = &H1
Public Const FILE_ATTRIBUTE_HIDDEN = &H2
Public Const FILE_ATTRIBUTE_SYSTEM = &H4
Public Const FILE_ATTRIBUTE_DIRECTORY = &H10
Public Const FILE_ATTRIBUTE_ARCHIVE = &H20
Public Const FILE_ATTRIBUTE_NORMAL = &H80
Public Const FILE_ATTRIBUTE_TEMPORARY = &H100
Public Const FILE_ATTRIBUTE_COMPRESSED = &H800

Public Const FTP_TRANSFER_TYPE_BINARY = &H2
Public Const FTP_TRANSFER_TYPE_ASCII = &H1
Public Const INTERNET_FLAG_RELOAD = &H80000000