what's wrong with this code?

>URL = Column->Field->Text.WideChar(tempURL, 1000);

  Does "Column->Field->Text.WideChar" actually allocate memory for the pointer tempURL?  You appear to allocate memory for either URL or tempURL.  Without knowing the more information about the specfic classes, that is all I can see wrong.

If you are not sure whether or not it allocates do:
void __fastcall TfrmListado::dbgridCellClick(TColumn *Column)
{
 if (Column->Index == 1)
    {
    wchar_t *tempURL = NULL;
    wchar_t *URL = NULL;
    URL = Column->Field->Text.WideChar(tempURL, 1000);
    CppInternetExplorer->Navigate(URL);
    }
}
If it is not allocating memory you'll get an access violation. I bet that is the problem.

that's not the problem. the code compiles well, but the thing is that the explorer windows is not even opened.

see what i mean. (i;m sure the problem is in the WideChar conversion, but as i'm not used to c++ yet I'm asking for help)

thanks

not answered

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  I still not convinced that any memory for the variables tempURL and URL is ever allocated.  Those are just pointers to wide characters.  Did you try allocating some memory for them?  This could cause the unexpected results.

  You won't necessarily get an access violation.  On non-NT machines, the memory is not quite so closely watch, and I have found I don't always get an access violation when I have memory leaks in my program.  NT watches memory more closely and catches more access violations that the other OSes don't.  

   Another problem yo may have is the scope of your two variables is just for that function.  The variables will not be available out side of it.

   What does "CppInternetExplorer->Navigate(URL);" do?  It would appear to just get the URL.  Have you already opened explorer prior to calling this function?  I don't have documentation for that available here.

   

it is true that, at first, I didn't allocate any memory for tempURL and URL, but that problem was solved (I believe) using the code snifong gave me.
   wchar_t *tempURL = NULL;
   wchar_t *URL = NULL;
is this OK? if not please give me code.

thanks.
   

ok. problem solved. memory was finally asigned for URL. But my question here is why doesn't this code open Internet Explorer.
I get a 'invalid variant operation' error.
(The internet explorer server control I am using is included only in C++ Builder 5, if I'm not wrong)

the code I'm using now is the following:

void __fastcall TfrmListado::dbgridCellClick(TColumn *Column)
{
 if (Column->Index == 1)
    {
    wchar_t *URL;
    URL = new wchar_t[100];
    Column->Field->Text.WideChar(URL, 100);
    CppInternetExplorer->Navigate(URL, TNoParam(), TNoParam(), TNoParam(), TNoParam());
    delete [] URL;
    }
}

thanks.

 I don't think I will be able to help you much on that, but I can offer some general suggestions.  Look at the help for the control.  Also, make sure that you have done everything that is required to setup the control.  It might just be one option that you haven't set right.  I only have C++Builder 3.0 at home, and VC++6.0 at work.

ok. However I have just solved the problem, thanks though.              

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  DO you want me to submit my first answer (to original question) as an answer or are you going to give credit to someone else?

Comment accepted as answer

sorry, I forgot about this.
thanx for reminding me.