hi ,everyone

    I want to make a project which is use c and vc++.
But the is a lots of parameter should be input.I want
to use VB to get the parameter and make a beautiful
visible.But I do not know how to use a VB active dll which include Form at a
c++ program.Some of body tell
me that vc can not use form because form is a special
varible only in VB.Can I use it?

    Please help me.

                                           yours liu

Liu,

You can use the dll as long as the from is modal (nonmodal forms won't
work). As for how to use it, just use it like a normal COM inproc server
(i.e. read up on #import).

--
Tomas Restrepo
http://members.xoom.com/trestrep/

Dear Tomas Restrepo:

    I am a new user of vb, I make the dll function
as this

Function ParameterInput(x As Integer) As Integer
    frmMain.Show vbModal, Me
End Function

but it can not work .I load it at vc project,
There is a error message tell me that the
form can not use.Can you tell me how to do it ,
or give me a sample?

    thanks for your help.

                                          yours liu

You are right . I make a mistake .
But there is an other question.
Do you know how to get a string parameter
from a vb activeX dll.I use this  code in vc

 short  bitInt,misInt;
 int st1;
 BSTR bstrDesc;
 BSTR aaa;
char cFile[256];

 aaa=(char*)&cFile;
 sourceFile= (LPCTSTR)(&sFile);
 comparedFile= (LPCTSTR)(&cFile);
 try
 {
  CoInitialize(NULL);
  _ParameterInputPtr ptr;
 ptr.CreateInstance(_uuidof(ParameterInput));
 st1 = ptr->ParameterInput(aaa,&bitInt,&misInt);
 }
 catch(_com_error &e)
 {
  bstrDesc = e.Description();
 }
CoUninitialize();

the fuction in vb is write as

Public Function ParameterInput(ByVal sourceFile As String, bitInt As
Integer, misInt As Integer) As Long
    sourceFile = "aaaa"
    bitInt = 1
    misInt = 2
    ParameterInput = 3
End Function

but get a wrong address ,where did I make a mistake?
thank you very much.

                                                  your liu

Liuszhen,

Several things
1- You can't create a BSTR by simply casting as you are doing now.  BSTRs
have to be allocated and deallocated using SysAllocString() and
SysFreeString() and related functions.
2- If you want to change the value of sourceFile in your VB code, and
retrieve it from yout VC++ code, I think you should declare it ByRef, not
ByVal (but I'm not of  VB guy, so I might be wrong).
3- The line aaa = (char*)&cFIle; is obviously incorrect, as you are taking
the address of the variable itself, not the address the array is stored at.
3- You are doing too many ugly casts  in your C++ code, trying to get things
to compile. Most of them are incorrect, and other will simply break if you
try to compile your code for uincode.

--
Tomas Restrepo
http://members.xoom.com/trestrep/