OpenEuphoria

EuCOM : Attn Matt : String Return Value

• Posted by Rad <radhx at rediffm?il.co?> Oct 02, 2007
• 741 views

Hi Matt,

I am trying to use one string encryption ocx using EuCOM.
TBrowse generates following method-

global constant
OneCryptA_clsid = "A90A1595-9949-4339-999E-D596977BD473",
OneCryptA_clsid_ix = add_clsid( OneCryptA_clsid) ,
OneCryptA_disp = add_iid( OneCryptA_clsid_ix, IDispatch),
OneCryptA_IQuickActivate_ix = add_iid( OneCryptA_clsid_ix, IQuickActivate ),
OneCryptA_IPersistStreamInit_ix = add_iid( 
	OneCryptA_clsid_ix, IPersistStreamInit ),
OneCryptA_IConnectionPointContainer_ix = add_iid( 
	OneCryptA_clsid_ix, IConnectionPointContainer )


--methods

-- disp methods for OneCryptA
global constant
OneCryptA_m_DecryptFile = 204,
    -- Returns:  VT_I4
    -- Key VT_BSTR [IN]
    -- InPath VT_BSTR [IN]
    -- OutPath VT_BSTR [IN]
OneCryptA_m_DecryptString = 202,
    -- Returns:  VT_BSTR
    -- Key VT_BSTR [IN]
    -- InString VT_BSTR [IN]
OneCryptA_m_DrawTextBiDiModeFlagsReadingOnly = 213,
    -- Returns:  VT_I4
OneCryptA_m_EncryptFile = 203,
    -- Returns:  VT_I4
    -- Key VT_BSTR [IN]
    -- InPath VT_BSTR [IN]
    -- OutPath VT_BSTR [IN]
global constant
OneCryptA_m_EncryptString = 201,
    -- Returns:  VT_BSTR
    -- Key VT_BSTR [IN]
    -- InString VT_BSTR [IN]

The method returns a string value.
parameters for the method are-

Parameters
  
Name        Data      Type Description 
====        ====      ================
Key         string    Encryption Key / Password / Phrase 
InString    string    Input string (plaintext) 


Return Value
  
Data        Type Description
====        ================
string      Encrypted string 



I am calling the method as follows:

OC6 = create_com_object( OneCryptA_clsid_ix )
if not OC6 then
    void = message_box("Registering mssreg3.ocx...", "msg", MB_ICONINFORMATION)
    void = open_dll("mssreg3.ocx")
    void = define_c_proc( void, "DllRegisterServer", {})
    c_proc( void, {})
    OC6 = create_com_object( OneCryptA_clsid_ix )
end if

if not OC6 then
    void = message_box("Create Error for mssreg3.ocx!", "msg", MB_ICONERROR)
    closeWindow(Window1)
end if

pBstr = alloc_bstr(getText(EditText18)) -- string to be encrypted
OCString = peek_bstr(pBstr) -- works fine

pBstr = invoke( OC6, {OneCryptA_m_EncryptString},
			  {alloc_bstr(OW6AppId), alloc_bstr(OCString)},
			  {VT_BSTR, VT_BSTR}, DISPATCH_METHOD )

void = message_box("Input String = " & OCString & "\n" &
			"pBstr = " & sprintf("%d", pBstr),
			"msg", MB_ICONINFORMATION)

setText(EditText19, peek_bstr(pBstr))

Whatever be the value of EditText18, pBstr always comes back with fixed value
2147614729.
And following error is generated at the syntax line of setText(EditText19,
peek_bstr(pBstr))-

---------------------------------------------------------
D:\EUPHORIA\EuCOM\unicode.ew:176 in function peek_bstr() 
A machine-level exception occurred during execution of this statement 
    bstr = 2147614729
    len = <no value>

... called from D:\EUPHORIA\EuCOM\OneWay60.exw:231 in procedure proc_onecrypt()
---------------------------------------------------------

I tried to get the return value in a sequence but got type mismatch error.

How to get a String as return value for this method?

Regards,
Rad.